Re: [PATCH] perf tools: Fix build errors with mipsel-linux-uclibc compiler

Re: [PATCH] perf tools: Fix build errors with mipsel-linux-uclibc compiler

[Alexey Brodkin]

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Hi Stephane,

> Em Fri, Sep 04, 2015 at 04:01:54PM -0700, Petri Gynther escreveu:
> > On Fri, Sep 4, 2015 at 3:48 PM, Arnaldo Carvalho de Melo
> > <ac...@kernel.org> wrote:
> > > Em Fri, Sep 04, 2015 at 03:45:03PM -0700, Petri Gynther escreveu:
> > >> This commit breaks the perf tool MIPS build because MIPS doesn't have
> > >> CONFIG_PERF_REGS=y in .config-detected:
> > >>
> > >> commit bcc84ec65ad1bd9f777a1fade6f8e5e0c5808fa5
> > >> Author: Stephane Eranian <era...@google.com>
> > >> Date:   Mon Aug 31 18:41:12 2015 +0200
> > >>
> > >>     perf record: Add ability to name registers to record
> > >
> > > There was a fix for another arch that came after this one.. here it is, already
> > > upstream, can you take a look?
> > >
> > > commit af4aeadd8c04303c0aa2d112145c3627e2ebd026
> > > Author: Stephane Eranian <era...@google.com>
> > > Date:   Tue Sep 1 11:30:14 2015 +0200
> > >
> > >     perf tools: Fix link time error with sample_reg_masks on non x86
> > >
> > >     This patch makes perf compile on non x86 platforms by defining a weak
> > >     symbol for sample_reg_masks[] in util/perf_regs.c.
> > >
> > >     The patch also moves the REG() and REG_END() macros into the
> > >     util/per_regs.h header file. The macros are renamed to
> > >     SMPL_REG/SMPL_REG_END to avoid clashes with other header files.
> > >
> > >
> > 
> > I have the above commit in my tree (as I have the latest Linus' tree
> > as of right now).
> > The MIPS build is still broken as I reported.
> 
> Stephane, can you please take a look?

The same problem happens when building perf on ARC.
I'm on 4.3-rc2 and that's what I see:
------------------->8-----------------
  LINK     .../linux-4.3-rc2/tools/perf/perf
.../linux-4.3-rc2/tools/perf/libperf.a(libperf-in.o): In function `parse_regs':
.../linux-4.3-rc2/tools/perf/util/parse-regs-options.c:28: undefined reference to `sample_reg_masks'
.../linux-4.3-rc2/tools/perf/util/parse-regs-options.c:45: undefined reference to `sample_reg_masks'
.../linux-4.3-rc2/tools/perf/util/parse-regs-options.c:38: undefined reference to `sample_reg_masks'
collect2: error: ld returned 1 exit status
------------------->8-----------------

Any chance for this to be discussed any further?

--
Alexeyÿôèº{.nÇ+‰·Ÿ®‰­†+%ŠËÿ±éݶ\x17¥Šwÿº{.nÇ+‰·¥Š{±þG«éÿŠ{ayº\x1dʇڙë,j\a­¢f£¢·hšïêÿ‘êçz_è®\x03(­éšŽŠÝ¢j"ú\x1a¶^[m§ÿÿ¾\a«þG«éÿ¢¸?™¨è­Ú&£ø§~á¶iO•æ¬z·švØ^\x14\x04\x1a¶^[m§ÿÿÃ\fÿ¶ìÿ¢¸?–I¥

Re: [PATCH] perf tools: Fix build errors with mipsel-linux-uclibc compiler

[Aaro Koskinen]

Hi,

On Mon, Sep 21, 2015 at 04:29:39PM +0000, Alexey Brodkin wrote:
> > Em Fri, Sep 04, 2015 at 04:01:54PM -0700, Petri Gynther escreveu:
> > > On Fri, Sep 4, 2015 at 3:48 PM, Arnaldo Carvalho de Melo
> > > <ac...@kernel.org> wrote:
> > > > Em Fri, Sep 04, 2015 at 03:45:03PM -0700, Petri Gynther escreveu:
> > > >> This commit breaks the perf tool MIPS build because MIPS doesn't have
> > > >> CONFIG_PERF_REGS=y in .config-detected:
> > > >>
> > > >> commit bcc84ec65ad1bd9f777a1fade6f8e5e0c5808fa5
> > > >> Author: Stephane Eranian <era...@google.com>
> > > >> Date:   Mon Aug 31 18:41:12 2015 +0200
> > > >>
> > > >>     perf record: Add ability to name registers to record
> > > >
> > > > There was a fix for another arch that came after this one.. here it is, already
> > > > upstream, can you take a look?
> > > >
> > > > commit af4aeadd8c04303c0aa2d112145c3627e2ebd026
> > > > Author: Stephane Eranian <era...@google.com>
> > > > Date:   Tue Sep 1 11:30:14 2015 +0200
> > > >
> > > >     perf tools: Fix link time error with sample_reg_masks on non x86
> > > >
> > > >     This patch makes perf compile on non x86 platforms by defining a weak
> > > >     symbol for sample_reg_masks[] in util/perf_regs.c.
> > > >
> > > >     The patch also moves the REG() and REG_END() macros into the
> > > >     util/per_regs.h header file. The macros are renamed to
> > > >     SMPL_REG/SMPL_REG_END to avoid clashes with other header files.
> > > >
> > > >
> > > 
> > > I have the above commit in my tree (as I have the latest Linus' tree
> > > as of right now).
> > > The MIPS build is still broken as I reported.
> > 
> > Stephane, can you please take a look?
> 
> The same problem happens when building perf on ARC.
> I'm on 4.3-rc2 and that's what I see:
> ------------------->8-----------------
>   LINK     .../linux-4.3-rc2/tools/perf/perf
> .../linux-4.3-rc2/tools/perf/libperf.a(libperf-in.o): In function `parse_regs':
> .../linux-4.3-rc2/tools/perf/util/parse-regs-options.c:28: undefined reference to `sample_reg_masks'
> .../linux-4.3-rc2/tools/perf/util/parse-regs-options.c:45: undefined reference to `sample_reg_masks'
> .../linux-4.3-rc2/tools/perf/util/parse-regs-options.c:38: undefined reference to `sample_reg_masks'
> collect2: error: ld returned 1 exit status
> ------------------->8-----------------
> 
> Any chance for this to be discussed any further?

Also (with 4.3-rc2) on PA-RISC, PowerPC and SPARC the same errors are
seen. 4.2 builds fine.

A.

Re: [PATCH] perf tools: Fix build errors with mipsel-linux-uclibc compiler

[Alexey Brodkin]

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Hello Stephane, Armaldo,

On Tue, 2015-09-22 at 00:06 +0300, Aaro Koskinen wrote:
> Hi,
> 
> On Mon, Sep 21, 2015 at 04:29:39PM +0000, Alexey Brodkin wrote:
> > > Em Fri, Sep 04, 2015 at 04:01:54PM -0700, Petri Gynther escreveu:
> > > > On Fri, Sep 4, 2015 at 3:48 PM, Arnaldo Carvalho de Melo
> > > > <ac...@kernel.org> wrote:
> > > > > Em Fri, Sep 04, 2015 at 03:45:03PM -0700, Petri Gynther escreveu:
> > > > > > This commit breaks the perf tool MIPS build because MIPS doesn't have
> > > > > > CONFIG_PERF_REGS=y in .config-detected:
> > > > > > 
> > > > > > commit bcc84ec65ad1bd9f777a1fade6f8e5e0c5808fa5
> > > > > > Author: Stephane Eranian <era...@google.com>
> > > > > > Date:   Mon Aug 31 18:41:12 2015 +0200
> > > > > > 
> > > > > >     perf record: Add ability to name registers to record
> > > > > 
> > > > > There was a fix for another arch that came after this one.. here it is, already
> > > > > upstream, can you take a look?
> > > > > 
> > > > > commit af4aeadd8c04303c0aa2d112145c3627e2ebd026
> > > > > Author: Stephane Eranian <era...@google.com>
> > > > > Date:   Tue Sep 1 11:30:14 2015 +0200
> > > > > 
> > > > >     perf tools: Fix link time error with sample_reg_masks on non x86
> > > > > 
> > > > >     This patch makes perf compile on non x86 platforms by defining a weak
> > > > >     symbol for sample_reg_masks[] in util/perf_regs.c.
> > > > > 
> > > > >     The patch also moves the REG() and REG_END() macros into the
> > > > >     util/per_regs.h header file. The macros are renamed to
> > > > >     SMPL_REG/SMPL_REG_END to avoid clashes with other header files.
> > > > > 
> > > > > 
> > > > 
> > > > I have the above commit in my tree (as I have the latest Linus' tree
> > > > as of right now).
> > > > The MIPS build is still broken as I reported.
> > > 
> > > Stephane, can you please take a look?
> > 
> > The same problem happens when building perf on ARC.
> > I'm on 4.3-rc2 and that's what I see:
> > ------------------->8-----------------
> >   LINK     .../linux-4.3-rc2/tools/perf/perf
> > .../linux-4.3-rc2/tools/perf/libperf.a(libperf-in.o): In function `parse_regs':
> > .../linux-4.3-rc2/tools/perf/util/parse-regs-options.c:28: undefined reference to `sample_reg_masks'
> > .../linux-4.3-rc2/tools/perf/util/parse-regs-options.c:45: undefined reference to `sample_reg_masks'
> > .../linux-4.3-rc2/tools/perf/util/parse-regs-options.c:38: undefined reference to `sample_reg_masks'
> > collect2: error: ld returned 1 exit status
> > ------------------->8-----------------
> > 
> > Any chance for this to be discussed any further?
> 
> Also (with 4.3-rc2) on PA-RISC, PowerPC and SPARC the same errors are
> seen. 4.2 builds fine.

Any chance to take a look at this issue?

It's already 4.3-rc3 so it would be nice to get some fix to try so there will be time
to make sure that new fix doesn't break stuff for other arches.

Regards,
Alexeyÿôèº{.nÇ+‰·Ÿ®‰­†+%ŠËÿ±éݶ\x17¥Šwÿº{.nÇ+‰·¥Š{±þG«éÿŠ{ayº\x1dʇڙë,j\a­¢f£¢·hšïêÿ‘êçz_è®\x03(­éšŽŠÝ¢j"ú\x1a¶^[m§ÿÿ¾\a«þG«éÿ¢¸?™¨è­Ú&£ø§~á¶iO•æ¬z·švØ^\x14\x04\x1a¶^[m§ÿÿÃ\fÿ¶ìÿ¢¸?–I¥

Re: [PATCH] perf tools: Fix build errors with mipsel-linux-uclibc compiler

[Petri Gynther]

On Sun, Oct 4, 2015 at 6:53 AM, Alexey Brodkin
<Alexey.Brodkin@synopsys.com> wrote:
> Hello Stephane, Armaldo,
>
> On Tue, 2015-09-22 at 00:06 +0300, Aaro Koskinen wrote:
>> Hi,
>>
>> On Mon, Sep 21, 2015 at 04:29:39PM +0000, Alexey Brodkin wrote:
>> > > Em Fri, Sep 04, 2015 at 04:01:54PM -0700, Petri Gynther escreveu:
>> > > > On Fri, Sep 4, 2015 at 3:48 PM, Arnaldo Carvalho de Melo
>> > > > <ac...@kernel.org> wrote:
>> > > > > Em Fri, Sep 04, 2015 at 03:45:03PM -0700, Petri Gynther escreveu:
>> > > > > > This commit breaks the perf tool MIPS build because MIPS doesn't have
>> > > > > > CONFIG_PERF_REGS=y in .config-detected:
>> > > > > >
>> > > > > > commit bcc84ec65ad1bd9f777a1fade6f8e5e0c5808fa5
>> > > > > > Author: Stephane Eranian <era...@google.com>
>> > > > > > Date:   Mon Aug 31 18:41:12 2015 +0200
>> > > > > >
>> > > > > >     perf record: Add ability to name registers to record
>> > > > >
>> > > > > There was a fix for another arch that came after this one.. here it is, already
>> > > > > upstream, can you take a look?
>> > > > >
>> > > > > commit af4aeadd8c04303c0aa2d112145c3627e2ebd026
>> > > > > Author: Stephane Eranian <era...@google.com>
>> > > > > Date:   Tue Sep 1 11:30:14 2015 +0200
>> > > > >
>> > > > >     perf tools: Fix link time error with sample_reg_masks on non x86
>> > > > >
>> > > > >     This patch makes perf compile on non x86 platforms by defining a weak
>> > > > >     symbol for sample_reg_masks[] in util/perf_regs.c.
>> > > > >
>> > > > >     The patch also moves the REG() and REG_END() macros into the
>> > > > >     util/per_regs.h header file. The macros are renamed to
>> > > > >     SMPL_REG/SMPL_REG_END to avoid clashes with other header files.
>> > > > >
>> > > > >
>> > > >
>> > > > I have the above commit in my tree (as I have the latest Linus' tree
>> > > > as of right now).
>> > > > The MIPS build is still broken as I reported.
>> > >
>> > > Stephane, can you please take a look?
>> >
>> > The same problem happens when building perf on ARC.
>> > I'm on 4.3-rc2 and that's what I see:
>> > ------------------->8-----------------
>> >   LINK     .../linux-4.3-rc2/tools/perf/perf
>> > .../linux-4.3-rc2/tools/perf/libperf.a(libperf-in.o): In function `parse_regs':
>> > .../linux-4.3-rc2/tools/perf/util/parse-regs-options.c:28: undefined reference to `sample_reg_masks'
>> > .../linux-4.3-rc2/tools/perf/util/parse-regs-options.c:45: undefined reference to `sample_reg_masks'
>> > .../linux-4.3-rc2/tools/perf/util/parse-regs-options.c:38: undefined reference to `sample_reg_masks'
>> > collect2: error: ld returned 1 exit status
>> > ------------------->8-----------------
>> >
>> > Any chance for this to be discussed any further?
>>
>> Also (with 4.3-rc2) on PA-RISC, PowerPC and SPARC the same errors are
>> seen. 4.2 builds fine.
>
> Any chance to take a look at this issue?
>
> It's already 4.3-rc3 so it would be nice to get some fix to try so there will be time
> to make sure that new fix doesn't break stuff for other arches.
>
> Regards,
> Alexey

I'd suggest to revert these two commits in Linus' tree:

commit af4aeadd8c04303c0aa2d112145c3627e2ebd026
Author: Stephane Eranian <eranian@google.com>
Date:   Tue Sep 1 11:30:14 2015 +0200

    perf tools: Fix link time error with sample_reg_masks on non x86

commit bcc84ec65ad1bd9f777a1fade6f8e5e0c5808fa5
Author: Stephane Eranian <eranian@google.com>
Date:   Mon Aug 31 18:41:12 2015 +0200

    perf record: Add ability to name registers to record

until this is figured out and tested for multiple architectures.

RE: [PATCH] perf tools: Fix build errors with mipsel-linux-uclibc compiler

[Alexey Brodkin]

Hi Petri,

> I'd suggest to revert these two commits in Linus' tree:
> 
> commit af4aeadd8c04303c0aa2d112145c3627e2ebd026
> Author: Stephane Eranian <eranian@google.com>
> Date:   Tue Sep 1 11:30:14 2015 +0200
> 
>     perf tools: Fix link time error with sample_reg_masks on non x86
> 
> commit bcc84ec65ad1bd9f777a1fade6f8e5e0c5808fa5
> Author: Stephane Eranian <eranian@google.com>
> Date:   Mon Aug 31 18:41:12 2015 +0200
> 
>     perf record: Add ability to name registers to record
> 
> until this is figured out and tested for multiple architectures.

Looks like that problem is already solved in linux-next.
See this commit - http://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/commit/tools/perf?id=eb56db54326f910348defbee2803ec0675a664b2

At least for me on ARC latest Linus' tree + this patch cherry-picked allows to build
perf perfectly fine.

-Alexey

Re: [PATCH] perf tools: Fix build errors with mipsel-linux-uclibc compiler

[Petri Gynther]

On Wed, Oct 7, 2015 at 11:58 AM, Alexey Brodkin
<Alexey.Brodkin@synopsys.com> wrote:
> Hi Petri,
>
>> I'd suggest to revert these two commits in Linus' tree:
>>
>> commit af4aeadd8c04303c0aa2d112145c3627e2ebd026
>> Author: Stephane Eranian <eranian@google.com>
>> Date:   Tue Sep 1 11:30:14 2015 +0200
>>
>>     perf tools: Fix link time error with sample_reg_masks on non x86
>>
>> commit bcc84ec65ad1bd9f777a1fade6f8e5e0c5808fa5
>> Author: Stephane Eranian <eranian@google.com>
>> Date:   Mon Aug 31 18:41:12 2015 +0200
>>
>>     perf record: Add ability to name registers to record
>>
>> until this is figured out and tested for multiple architectures.
>
> Looks like that problem is already solved in linux-next.
> See this commit - http://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/commit/tools/perf?id=eb56db54326f910348defbee2803ec0675a664b2
>
> At least for me on ARC latest Linus' tree + this patch cherry-picked allows to build
> perf perfectly fine.
>

This patch is now in v4.3-rc5, and perf build for MIPS works fine. Thanks.

> -Alexey

[PATCH] perf tools: Fix build errors with mipsel-linux-uclibc compiler

[Petri Gynther]

linux/tools$ make ARCH=mips CROSS_COMPILE=mipsel-linux- perf
...
config/Makefile:256: *** No gnu/libc-version.h found, please install
glibc-dev[el].  Stop.
make[1]: *** [all] Error 2
make: *** [perf] Error 2

...
In file included from builtin-sched.c:13:0:
util/cloexec.h:8:12: error: redundant redeclaration of ‘sched_getcpu’
 [-Werror=redundant-decls]
 extern int sched_getcpu(void) __THROW;

mipsel-buildroot-linux-uclibc/sysroot/usr/include/bits/sched.h:88:12:
 note: previous declaration of ‘sched_getcpu’ was here
 extern int sched_getcpu (void) __THROW;

uclibc info:
sysroot/usr/include/bits/uClibc_config.h
__UCLIBC_MAJOR__ 0
__UCLIBC_MINOR__ 9
__UCLIBC_SUBLEVEL__ 33

sysroot/usr/include/features.h
__UCLIBC__ 1
__GLIBC__ 2
__GLIBC_MINOR__ 2

Signed-off-by: Petri Gynther <pgynther@google.com>
---
 tools/build/feature/test-glibc.c | 11 +++++++++++
 tools/perf/util/cloexec.h        |  2 +-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/tools/build/feature/test-glibc.c b/tools/build/feature/test-glibc.c
index b082034..9367f75 100644
--- a/tools/build/feature/test-glibc.c
+++ b/tools/build/feature/test-glibc.c
@@ -1,8 +1,19 @@
+#include <stdlib.h>
+
+#if !defined(__UCLIBC__)
 #include <gnu/libc-version.h>
+#else
+#define XSTR(s) STR(s)
+#define STR(s) #s
+#endif
 
 int main(void)
 {
+#if !defined(__UCLIBC__)
 	const char *version = gnu_get_libc_version();
+#else
+	const char *version = XSTR(__GLIBC__) "." XSTR(__GLIBC_MINOR__);
+#endif
 
 	return (long)version;
 }
diff --git a/tools/perf/util/cloexec.h b/tools/perf/util/cloexec.h
index 68888c2..3bee677 100644
--- a/tools/perf/util/cloexec.h
+++ b/tools/perf/util/cloexec.h
@@ -4,7 +4,7 @@
 unsigned long perf_event_open_cloexec_flag(void);
 
 #ifdef __GLIBC_PREREQ
-#if !__GLIBC_PREREQ(2, 6)
+#if !__GLIBC_PREREQ(2, 6) && !defined(__UCLIBC__)
 extern int sched_getcpu(void) __THROW;
 #endif
 #endif
-- 
2.5.0.rc2.392.g76e840b

Re: [PATCH] perf tools: Fix build errors with mipsel-linux-uclibc compiler

[Petri Gynther]

I see that this patch is now in upstream. However, something else has
now broken the perf tool MIPS build:

linux/tools$ git describe
v4.2-7656-g51e771c

linux/tools$ make ARCH=mips CROSS_COMPILE=mipsel-linux- perf
mkdir -p  .
make --no-print-directory -C perf O= subdir=
  BUILD:   Doing 'make -j12' parallel build

Auto-detecting system features:
...                         dwarf: [ OFF ]
...                         glibc: [ on  ]
...                          gtk2: [ OFF ]
...                      libaudit: [ OFF ]
...                        libbfd: [ OFF ]
...                        libelf: [ OFF ]
...                       libnuma: [ OFF ]
...                       libperl: [ OFF ]
...                     libpython: [ OFF ]
...                      libslang: [ OFF ]
...                     libunwind: [ OFF ]
...            libdw-dwarf-unwind: [ OFF ]
...                          zlib: [ OFF ]
...                          lzma: [ OFF ]

...

  AR       libperf.a
  LINK     perf
libperf.a(libperf-in.o): In function `parse_regs':
(.text+0x9f5b4): undefined reference to `sample_reg_masks'
libperf.a(libperf-in.o): In function `parse_regs':
(.text+0x9f604): undefined reference to `sample_reg_masks'
libperf.a(libperf-in.o): In function `parse_regs':
(.text+0x9f708): undefined reference to `sample_reg_masks'
collect2: error: ld returned 1 exit status
make[2]: *** [perf] Error 1
make[1]: *** [all] Error 2
make: *** [perf] Error 2

On Tue, Aug 4, 2015 at 5:38 PM, Petri Gynther <pgynther@google.com> wrote:
> linux/tools$ make ARCH=mips CROSS_COMPILE=mipsel-linux- perf
> ...
> config/Makefile:256: *** No gnu/libc-version.h found, please install
> glibc-dev[el].  Stop.
> make[1]: *** [all] Error 2
> make: *** [perf] Error 2
>
> ...
> In file included from builtin-sched.c:13:0:
> util/cloexec.h:8:12: error: redundant redeclaration of ‘sched_getcpu’
>  [-Werror=redundant-decls]
>  extern int sched_getcpu(void) __THROW;
>
> mipsel-buildroot-linux-uclibc/sysroot/usr/include/bits/sched.h:88:12:
>  note: previous declaration of ‘sched_getcpu’ was here
>  extern int sched_getcpu (void) __THROW;
>
> uclibc info:
> sysroot/usr/include/bits/uClibc_config.h
> __UCLIBC_MAJOR__ 0
> __UCLIBC_MINOR__ 9
> __UCLIBC_SUBLEVEL__ 33
>
> sysroot/usr/include/features.h
> __UCLIBC__ 1
> __GLIBC__ 2
> __GLIBC_MINOR__ 2
>
> Signed-off-by: Petri Gynther <pgynther@google.com>
> ---
>  tools/build/feature/test-glibc.c | 11 +++++++++++
>  tools/perf/util/cloexec.h        |  2 +-
>  2 files changed, 12 insertions(+), 1 deletion(-)
>
> diff --git a/tools/build/feature/test-glibc.c b/tools/build/feature/test-glibc.c
> index b082034..9367f75 100644
> --- a/tools/build/feature/test-glibc.c
> +++ b/tools/build/feature/test-glibc.c
> @@ -1,8 +1,19 @@
> +#include <stdlib.h>
> +
> +#if !defined(__UCLIBC__)
>  #include <gnu/libc-version.h>
> +#else
> +#define XSTR(s) STR(s)
> +#define STR(s) #s
> +#endif
>
>  int main(void)
>  {
> +#if !defined(__UCLIBC__)
>         const char *version = gnu_get_libc_version();
> +#else
> +       const char *version = XSTR(__GLIBC__) "." XSTR(__GLIBC_MINOR__);
> +#endif
>
>         return (long)version;
>  }
> diff --git a/tools/perf/util/cloexec.h b/tools/perf/util/cloexec.h
> index 68888c2..3bee677 100644
> --- a/tools/perf/util/cloexec.h
> +++ b/tools/perf/util/cloexec.h
> @@ -4,7 +4,7 @@
>  unsigned long perf_event_open_cloexec_flag(void);
>
>  #ifdef __GLIBC_PREREQ
> -#if !__GLIBC_PREREQ(2, 6)
> +#if !__GLIBC_PREREQ(2, 6) && !defined(__UCLIBC__)
>  extern int sched_getcpu(void) __THROW;
>  #endif
>  #endif
> --
> 2.5.0.rc2.392.g76e840b
>

Re: [PATCH] perf tools: Fix build errors with mipsel-linux-uclibc compiler

[Petri Gynther]

This commit breaks the perf tool MIPS build because MIPS doesn't have
CONFIG_PERF_REGS=y in .config-detected:

commit bcc84ec65ad1bd9f777a1fade6f8e5e0c5808fa5
Author: Stephane Eranian <eranian@google.com>
Date:   Mon Aug 31 18:41:12 2015 +0200

    perf record: Add ability to name registers to record

On Fri, Sep 4, 2015 at 3:19 PM, Petri Gynther <pgynther@google.com> wrote:
> I see that this patch is now in upstream. However, something else has
> now broken the perf tool MIPS build:
>
> linux/tools$ git describe
> v4.2-7656-g51e771c
>
> linux/tools$ make ARCH=mips CROSS_COMPILE=mipsel-linux- perf
> mkdir -p  .
> make --no-print-directory -C perf O= subdir=
>   BUILD:   Doing 'make -j12' parallel build
>
> Auto-detecting system features:
> ...                         dwarf: [ OFF ]
> ...                         glibc: [ on  ]
> ...                          gtk2: [ OFF ]
> ...                      libaudit: [ OFF ]
> ...                        libbfd: [ OFF ]
> ...                        libelf: [ OFF ]
> ...                       libnuma: [ OFF ]
> ...                       libperl: [ OFF ]
> ...                     libpython: [ OFF ]
> ...                      libslang: [ OFF ]
> ...                     libunwind: [ OFF ]
> ...            libdw-dwarf-unwind: [ OFF ]
> ...                          zlib: [ OFF ]
> ...                          lzma: [ OFF ]
>
> ...
>
>   AR       libperf.a
>   LINK     perf
> libperf.a(libperf-in.o): In function `parse_regs':
> (.text+0x9f5b4): undefined reference to `sample_reg_masks'
> libperf.a(libperf-in.o): In function `parse_regs':
> (.text+0x9f604): undefined reference to `sample_reg_masks'
> libperf.a(libperf-in.o): In function `parse_regs':
> (.text+0x9f708): undefined reference to `sample_reg_masks'
> collect2: error: ld returned 1 exit status
> make[2]: *** [perf] Error 1
> make[1]: *** [all] Error 2
> make: *** [perf] Error 2
>
> On Tue, Aug 4, 2015 at 5:38 PM, Petri Gynther <pgynther@google.com> wrote:
>> linux/tools$ make ARCH=mips CROSS_COMPILE=mipsel-linux- perf
>> ...
>> config/Makefile:256: *** No gnu/libc-version.h found, please install
>> glibc-dev[el].  Stop.
>> make[1]: *** [all] Error 2
>> make: *** [perf] Error 2
>>
>> ...
>> In file included from builtin-sched.c:13:0:
>> util/cloexec.h:8:12: error: redundant redeclaration of ‘sched_getcpu’
>>  [-Werror=redundant-decls]
>>  extern int sched_getcpu(void) __THROW;
>>
>> mipsel-buildroot-linux-uclibc/sysroot/usr/include/bits/sched.h:88:12:
>>  note: previous declaration of ‘sched_getcpu’ was here
>>  extern int sched_getcpu (void) __THROW;
>>
>> uclibc info:
>> sysroot/usr/include/bits/uClibc_config.h
>> __UCLIBC_MAJOR__ 0
>> __UCLIBC_MINOR__ 9
>> __UCLIBC_SUBLEVEL__ 33
>>
>> sysroot/usr/include/features.h
>> __UCLIBC__ 1
>> __GLIBC__ 2
>> __GLIBC_MINOR__ 2
>>
>> Signed-off-by: Petri Gynther <pgynther@google.com>
>> ---
>>  tools/build/feature/test-glibc.c | 11 +++++++++++
>>  tools/perf/util/cloexec.h        |  2 +-
>>  2 files changed, 12 insertions(+), 1 deletion(-)
>>
>> diff --git a/tools/build/feature/test-glibc.c b/tools/build/feature/test-glibc.c
>> index b082034..9367f75 100644
>> --- a/tools/build/feature/test-glibc.c
>> +++ b/tools/build/feature/test-glibc.c
>> @@ -1,8 +1,19 @@
>> +#include <stdlib.h>
>> +
>> +#if !defined(__UCLIBC__)
>>  #include <gnu/libc-version.h>
>> +#else
>> +#define XSTR(s) STR(s)
>> +#define STR(s) #s
>> +#endif
>>
>>  int main(void)
>>  {
>> +#if !defined(__UCLIBC__)
>>         const char *version = gnu_get_libc_version();
>> +#else
>> +       const char *version = XSTR(__GLIBC__) "." XSTR(__GLIBC_MINOR__);
>> +#endif
>>
>>         return (long)version;
>>  }
>> diff --git a/tools/perf/util/cloexec.h b/tools/perf/util/cloexec.h
>> index 68888c2..3bee677 100644
>> --- a/tools/perf/util/cloexec.h
>> +++ b/tools/perf/util/cloexec.h
>> @@ -4,7 +4,7 @@
>>  unsigned long perf_event_open_cloexec_flag(void);
>>
>>  #ifdef __GLIBC_PREREQ
>> -#if !__GLIBC_PREREQ(2, 6)
>> +#if !__GLIBC_PREREQ(2, 6) && !defined(__UCLIBC__)
>>  extern int sched_getcpu(void) __THROW;
>>  #endif
>>  #endif
>> --
>> 2.5.0.rc2.392.g76e840b
>>

Re: [PATCH] perf tools: Fix build errors with mipsel-linux-uclibc compiler

[Arnaldo Carvalho de Melo]

Em Fri, Sep 04, 2015 at 03:45:03PM -0700, Petri Gynther escreveu:
> This commit breaks the perf tool MIPS build because MIPS doesn't have
> CONFIG_PERF_REGS=y in .config-detected:
> 
> commit bcc84ec65ad1bd9f777a1fade6f8e5e0c5808fa5
> Author: Stephane Eranian <eranian@google.com>
> Date:   Mon Aug 31 18:41:12 2015 +0200
> 
>     perf record: Add ability to name registers to record

There was a fix for another arch that came after this one.. here it is, already
upstream, can you take a look?

commit af4aeadd8c04303c0aa2d112145c3627e2ebd026
Author: Stephane Eranian <eranian@google.com>
Date:   Tue Sep 1 11:30:14 2015 +0200

    perf tools: Fix link time error with sample_reg_masks on non x86
    
    This patch makes perf compile on non x86 platforms by defining a weak
    symbol for sample_reg_masks[] in util/perf_regs.c.
    
    The patch also moves the REG() and REG_END() macros into the
    util/per_regs.h header file. The macros are renamed to
    SMPL_REG/SMPL_REG_END to avoid clashes with other header files.

 
> On Fri, Sep 4, 2015 at 3:19 PM, Petri Gynther <pgynther@google.com> wrote:
> > I see that this patch is now in upstream. However, something else has
> > now broken the perf tool MIPS build:
> >
> > linux/tools$ git describe
> > v4.2-7656-g51e771c
> >
> > linux/tools$ make ARCH=mips CROSS_COMPILE=mipsel-linux- perf
> > mkdir -p  .
> > make --no-print-directory -C perf O= subdir=
> >   BUILD:   Doing 'make -j12' parallel build
> >
> > Auto-detecting system features:
> > ...                         dwarf: [ OFF ]
> > ...                         glibc: [ on  ]
> > ...                          gtk2: [ OFF ]
> > ...                      libaudit: [ OFF ]
> > ...                        libbfd: [ OFF ]
> > ...                        libelf: [ OFF ]
> > ...                       libnuma: [ OFF ]
> > ...                       libperl: [ OFF ]
> > ...                     libpython: [ OFF ]
> > ...                      libslang: [ OFF ]
> > ...                     libunwind: [ OFF ]
> > ...            libdw-dwarf-unwind: [ OFF ]
> > ...                          zlib: [ OFF ]
> > ...                          lzma: [ OFF ]
> >
> > ...
> >
> >   AR       libperf.a
> >   LINK     perf
> > libperf.a(libperf-in.o): In function `parse_regs':
> > (.text+0x9f5b4): undefined reference to `sample_reg_masks'
> > libperf.a(libperf-in.o): In function `parse_regs':
> > (.text+0x9f604): undefined reference to `sample_reg_masks'
> > libperf.a(libperf-in.o): In function `parse_regs':
> > (.text+0x9f708): undefined reference to `sample_reg_masks'
> > collect2: error: ld returned 1 exit status
> > make[2]: *** [perf] Error 1
> > make[1]: *** [all] Error 2
> > make: *** [perf] Error 2
> >
> > On Tue, Aug 4, 2015 at 5:38 PM, Petri Gynther <pgynther@google.com> wrote:
> >> linux/tools$ make ARCH=mips CROSS_COMPILE=mipsel-linux- perf
> >> ...
> >> config/Makefile:256: *** No gnu/libc-version.h found, please install
> >> glibc-dev[el].  Stop.
> >> make[1]: *** [all] Error 2
> >> make: *** [perf] Error 2
> >>
> >> ...
> >> In file included from builtin-sched.c:13:0:
> >> util/cloexec.h:8:12: error: redundant redeclaration of ‘sched_getcpu’
> >>  [-Werror=redundant-decls]
> >>  extern int sched_getcpu(void) __THROW;
> >>
> >> mipsel-buildroot-linux-uclibc/sysroot/usr/include/bits/sched.h:88:12:
> >>  note: previous declaration of ‘sched_getcpu’ was here
> >>  extern int sched_getcpu (void) __THROW;
> >>
> >> uclibc info:
> >> sysroot/usr/include/bits/uClibc_config.h
> >> __UCLIBC_MAJOR__ 0
> >> __UCLIBC_MINOR__ 9
> >> __UCLIBC_SUBLEVEL__ 33
> >>
> >> sysroot/usr/include/features.h
> >> __UCLIBC__ 1
> >> __GLIBC__ 2
> >> __GLIBC_MINOR__ 2
> >>
> >> Signed-off-by: Petri Gynther <pgynther@google.com>
> >> ---
> >>  tools/build/feature/test-glibc.c | 11 +++++++++++
> >>  tools/perf/util/cloexec.h        |  2 +-
> >>  2 files changed, 12 insertions(+), 1 deletion(-)
> >>
> >> diff --git a/tools/build/feature/test-glibc.c b/tools/build/feature/test-glibc.c
> >> index b082034..9367f75 100644
> >> --- a/tools/build/feature/test-glibc.c
> >> +++ b/tools/build/feature/test-glibc.c
> >> @@ -1,8 +1,19 @@
> >> +#include <stdlib.h>
> >> +
> >> +#if !defined(__UCLIBC__)
> >>  #include <gnu/libc-version.h>
> >> +#else
> >> +#define XSTR(s) STR(s)
> >> +#define STR(s) #s
> >> +#endif
> >>
> >>  int main(void)
> >>  {
> >> +#if !defined(__UCLIBC__)
> >>         const char *version = gnu_get_libc_version();
> >> +#else
> >> +       const char *version = XSTR(__GLIBC__) "." XSTR(__GLIBC_MINOR__);
> >> +#endif
> >>
> >>         return (long)version;
> >>  }
> >> diff --git a/tools/perf/util/cloexec.h b/tools/perf/util/cloexec.h
> >> index 68888c2..3bee677 100644
> >> --- a/tools/perf/util/cloexec.h
> >> +++ b/tools/perf/util/cloexec.h
> >> @@ -4,7 +4,7 @@
> >>  unsigned long perf_event_open_cloexec_flag(void);
> >>
> >>  #ifdef __GLIBC_PREREQ
> >> -#if !__GLIBC_PREREQ(2, 6)
> >> +#if !__GLIBC_PREREQ(2, 6) && !defined(__UCLIBC__)
> >>  extern int sched_getcpu(void) __THROW;
> >>  #endif
> >>  #endif
> >> --
> >> 2.5.0.rc2.392.g76e840b
> >>

Re: [PATCH] perf tools: Fix build errors with mipsel-linux-uclibc compiler

[Petri Gynther]

On Fri, Sep 4, 2015 at 3:48 PM, Arnaldo Carvalho de Melo
<acme@kernel.org> wrote:
> Em Fri, Sep 04, 2015 at 03:45:03PM -0700, Petri Gynther escreveu:
>> This commit breaks the perf tool MIPS build because MIPS doesn't have
>> CONFIG_PERF_REGS=y in .config-detected:
>>
>> commit bcc84ec65ad1bd9f777a1fade6f8e5e0c5808fa5
>> Author: Stephane Eranian <eranian@google.com>
>> Date:   Mon Aug 31 18:41:12 2015 +0200
>>
>>     perf record: Add ability to name registers to record
>
> There was a fix for another arch that came after this one.. here it is, already
> upstream, can you take a look?
>
> commit af4aeadd8c04303c0aa2d112145c3627e2ebd026
> Author: Stephane Eranian <eranian@google.com>
> Date:   Tue Sep 1 11:30:14 2015 +0200
>
>     perf tools: Fix link time error with sample_reg_masks on non x86
>
>     This patch makes perf compile on non x86 platforms by defining a weak
>     symbol for sample_reg_masks[] in util/perf_regs.c.
>
>     The patch also moves the REG() and REG_END() macros into the
>     util/per_regs.h header file. The macros are renamed to
>     SMPL_REG/SMPL_REG_END to avoid clashes with other header files.
>
>

I have the above commit in my tree (as I have the latest Linus' tree
as of right now).
The MIPS build is still broken as I reported.

tools/perf/util/perf_regs.c doesn't get compiled on MIPS because:

CONFIG_PERF_REGS is not set on MIPS
and
tools/perf/util/Build:
libperf-$(CONFIG_PERF_REGS) += perf_regs.o

Converting the above to:
libperf-y += perf_regs.o

leads to other build errors:
...
  CC       util/perf_regs.o
In file included from util/perf_regs.c:2:0:
util/perf_regs.h:26:48: error: expected ‘;’, ‘,’ or ‘)’ before ‘__maybe_unused’
 static inline const char *perf_reg_name(int id __maybe_unused)
                                                ^
util/perf_regs.h:31:44: error: expected ‘;’, ‘,’ or ‘)’ before ‘__maybe_unused’
 static inline int perf_reg_value(u64 *valp __maybe_unused,
                                            ^
  FLEX     util/parse-events-flex.c
util/perf_regs.c:9:5: error: no previous prototype for
‘perf_reg_value’ [-Werror=missing-prototypes]
 int perf_reg_value(u64 *valp, struct regs_dump *regs, int id)
     ^
cc1: all warnings being treated as errors
  CC       util/intel-pt-decoder/intel-pt-log.o
make[4]: *** [util/perf_regs.o] Error 1
make[4]: *** Waiting for unfinished jobs....
  CC       util/intel-pt-decoder/intel-pt-decoder.o
  LD       tests/perf-in.o
  CC       util/intel-pt-decoder/intel-pt-insn-decoder.o
  LD       perf-in.o
  LD       util/intel-pt-decoder/libperf-in.o
make[3]: *** [util] Error 2
make[2]: *** [libperf-in.o] Error 2
make[1]: *** [all] Error 2
make: *** [perf] Error 2


>> On Fri, Sep 4, 2015 at 3:19 PM, Petri Gynther <pgynther@google.com> wrote:
>> > I see that this patch is now in upstream. However, something else has
>> > now broken the perf tool MIPS build:
>> >
>> > linux/tools$ git describe
>> > v4.2-7656-g51e771c
>> >
>> > linux/tools$ make ARCH=mips CROSS_COMPILE=mipsel-linux- perf
>> > mkdir -p  .
>> > make --no-print-directory -C perf O= subdir=
>> >   BUILD:   Doing 'make -j12' parallel build
>> >
>> > Auto-detecting system features:
>> > ...                         dwarf: [ OFF ]
>> > ...                         glibc: [ on  ]
>> > ...                          gtk2: [ OFF ]
>> > ...                      libaudit: [ OFF ]
>> > ...                        libbfd: [ OFF ]
>> > ...                        libelf: [ OFF ]
>> > ...                       libnuma: [ OFF ]
>> > ...                       libperl: [ OFF ]
>> > ...                     libpython: [ OFF ]
>> > ...                      libslang: [ OFF ]
>> > ...                     libunwind: [ OFF ]
>> > ...            libdw-dwarf-unwind: [ OFF ]
>> > ...                          zlib: [ OFF ]
>> > ...                          lzma: [ OFF ]
>> >
>> > ...
>> >
>> >   AR       libperf.a
>> >   LINK     perf
>> > libperf.a(libperf-in.o): In function `parse_regs':
>> > (.text+0x9f5b4): undefined reference to `sample_reg_masks'
>> > libperf.a(libperf-in.o): In function `parse_regs':
>> > (.text+0x9f604): undefined reference to `sample_reg_masks'
>> > libperf.a(libperf-in.o): In function `parse_regs':
>> > (.text+0x9f708): undefined reference to `sample_reg_masks'
>> > collect2: error: ld returned 1 exit status
>> > make[2]: *** [perf] Error 1
>> > make[1]: *** [all] Error 2
>> > make: *** [perf] Error 2
>> >
>> > On Tue, Aug 4, 2015 at 5:38 PM, Petri Gynther <pgynther@google.com> wrote:
>> >> linux/tools$ make ARCH=mips CROSS_COMPILE=mipsel-linux- perf
>> >> ...
>> >> config/Makefile:256: *** No gnu/libc-version.h found, please install
>> >> glibc-dev[el].  Stop.
>> >> make[1]: *** [all] Error 2
>> >> make: *** [perf] Error 2
>> >>
>> >> ...
>> >> In file included from builtin-sched.c:13:0:
>> >> util/cloexec.h:8:12: error: redundant redeclaration of ‘sched_getcpu’
>> >>  [-Werror=redundant-decls]
>> >>  extern int sched_getcpu(void) __THROW;
>> >>
>> >> mipsel-buildroot-linux-uclibc/sysroot/usr/include/bits/sched.h:88:12:
>> >>  note: previous declaration of ‘sched_getcpu’ was here
>> >>  extern int sched_getcpu (void) __THROW;
>> >>
>> >> uclibc info:
>> >> sysroot/usr/include/bits/uClibc_config.h
>> >> __UCLIBC_MAJOR__ 0
>> >> __UCLIBC_MINOR__ 9
>> >> __UCLIBC_SUBLEVEL__ 33
>> >>
>> >> sysroot/usr/include/features.h
>> >> __UCLIBC__ 1
>> >> __GLIBC__ 2
>> >> __GLIBC_MINOR__ 2
>> >>
>> >> Signed-off-by: Petri Gynther <pgynther@google.com>
>> >> ---
>> >>  tools/build/feature/test-glibc.c | 11 +++++++++++
>> >>  tools/perf/util/cloexec.h        |  2 +-
>> >>  2 files changed, 12 insertions(+), 1 deletion(-)
>> >>
>> >> diff --git a/tools/build/feature/test-glibc.c b/tools/build/feature/test-glibc.c
>> >> index b082034..9367f75 100644
>> >> --- a/tools/build/feature/test-glibc.c
>> >> +++ b/tools/build/feature/test-glibc.c
>> >> @@ -1,8 +1,19 @@
>> >> +#include <stdlib.h>
>> >> +
>> >> +#if !defined(__UCLIBC__)
>> >>  #include <gnu/libc-version.h>
>> >> +#else
>> >> +#define XSTR(s) STR(s)
>> >> +#define STR(s) #s
>> >> +#endif
>> >>
>> >>  int main(void)
>> >>  {
>> >> +#if !defined(__UCLIBC__)
>> >>         const char *version = gnu_get_libc_version();
>> >> +#else
>> >> +       const char *version = XSTR(__GLIBC__) "." XSTR(__GLIBC_MINOR__);
>> >> +#endif
>> >>
>> >>         return (long)version;
>> >>  }
>> >> diff --git a/tools/perf/util/cloexec.h b/tools/perf/util/cloexec.h
>> >> index 68888c2..3bee677 100644
>> >> --- a/tools/perf/util/cloexec.h
>> >> +++ b/tools/perf/util/cloexec.h
>> >> @@ -4,7 +4,7 @@
>> >>  unsigned long perf_event_open_cloexec_flag(void);
>> >>
>> >>  #ifdef __GLIBC_PREREQ
>> >> -#if !__GLIBC_PREREQ(2, 6)
>> >> +#if !__GLIBC_PREREQ(2, 6) && !defined(__UCLIBC__)
>> >>  extern int sched_getcpu(void) __THROW;
>> >>  #endif
>> >>  #endif
>> >> --
>> >> 2.5.0.rc2.392.g76e840b
>> >>

Re: [PATCH] perf tools: Fix build errors with mipsel-linux-uclibc compiler

[Arnaldo Carvalho de Melo]

Em Fri, Sep 04, 2015 at 04:01:54PM -0700, Petri Gynther escreveu:
> On Fri, Sep 4, 2015 at 3:48 PM, Arnaldo Carvalho de Melo
> <acme@kernel.org> wrote:
> > Em Fri, Sep 04, 2015 at 03:45:03PM -0700, Petri Gynther escreveu:
> >> This commit breaks the perf tool MIPS build because MIPS doesn't have
> >> CONFIG_PERF_REGS=y in .config-detected:
> >>
> >> commit bcc84ec65ad1bd9f777a1fade6f8e5e0c5808fa5
> >> Author: Stephane Eranian <eranian@google.com>
> >> Date:   Mon Aug 31 18:41:12 2015 +0200
> >>
> >>     perf record: Add ability to name registers to record
> >
> > There was a fix for another arch that came after this one.. here it is, already
> > upstream, can you take a look?
> >
> > commit af4aeadd8c04303c0aa2d112145c3627e2ebd026
> > Author: Stephane Eranian <eranian@google.com>
> > Date:   Tue Sep 1 11:30:14 2015 +0200
> >
> >     perf tools: Fix link time error with sample_reg_masks on non x86
> >
> >     This patch makes perf compile on non x86 platforms by defining a weak
> >     symbol for sample_reg_masks[] in util/perf_regs.c.
> >
> >     The patch also moves the REG() and REG_END() macros into the
> >     util/per_regs.h header file. The macros are renamed to
> >     SMPL_REG/SMPL_REG_END to avoid clashes with other header files.
> >
> >
> 
> I have the above commit in my tree (as I have the latest Linus' tree
> as of right now).
> The MIPS build is still broken as I reported.

Stephane, can you please take a look?

- Arnaldo
 
> tools/perf/util/perf_regs.c doesn't get compiled on MIPS because:
> 
> CONFIG_PERF_REGS is not set on MIPS
> and
> tools/perf/util/Build:
> libperf-$(CONFIG_PERF_REGS) += perf_regs.o
> 
> Converting the above to:
> libperf-y += perf_regs.o
> 
> leads to other build errors:
> ...
>   CC       util/perf_regs.o
> In file included from util/perf_regs.c:2:0:
> util/perf_regs.h:26:48: error: expected ‘;’, ‘,’ or ‘)’ before ‘__maybe_unused’
>  static inline const char *perf_reg_name(int id __maybe_unused)
>                                                 ^
> util/perf_regs.h:31:44: error: expected ‘;’, ‘,’ or ‘)’ before ‘__maybe_unused’
>  static inline int perf_reg_value(u64 *valp __maybe_unused,
>                                             ^
>   FLEX     util/parse-events-flex.c
> util/perf_regs.c:9:5: error: no previous prototype for
> ‘perf_reg_value’ [-Werror=missing-prototypes]
>  int perf_reg_value(u64 *valp, struct regs_dump *regs, int id)
>      ^
> cc1: all warnings being treated as errors
>   CC       util/intel-pt-decoder/intel-pt-log.o
> make[4]: *** [util/perf_regs.o] Error 1
> make[4]: *** Waiting for unfinished jobs....
>   CC       util/intel-pt-decoder/intel-pt-decoder.o
>   LD       tests/perf-in.o
>   CC       util/intel-pt-decoder/intel-pt-insn-decoder.o
>   LD       perf-in.o
>   LD       util/intel-pt-decoder/libperf-in.o
> make[3]: *** [util] Error 2
> make[2]: *** [libperf-in.o] Error 2
> make[1]: *** [all] Error 2
> make: *** [perf] Error 2
> 
> 
> >> On Fri, Sep 4, 2015 at 3:19 PM, Petri Gynther <pgynther@google.com> wrote:
> >> > I see that this patch is now in upstream. However, something else has
> >> > now broken the perf tool MIPS build:
> >> >
> >> > linux/tools$ git describe
> >> > v4.2-7656-g51e771c
> >> >
> >> > linux/tools$ make ARCH=mips CROSS_COMPILE=mipsel-linux- perf
> >> > mkdir -p  .
> >> > make --no-print-directory -C perf O= subdir=
> >> >   BUILD:   Doing 'make -j12' parallel build
> >> >
> >> > Auto-detecting system features:
> >> > ...                         dwarf: [ OFF ]
> >> > ...                         glibc: [ on  ]
> >> > ...                          gtk2: [ OFF ]
> >> > ...                      libaudit: [ OFF ]
> >> > ...                        libbfd: [ OFF ]
> >> > ...                        libelf: [ OFF ]
> >> > ...                       libnuma: [ OFF ]
> >> > ...                       libperl: [ OFF ]
> >> > ...                     libpython: [ OFF ]
> >> > ...                      libslang: [ OFF ]
> >> > ...                     libunwind: [ OFF ]
> >> > ...            libdw-dwarf-unwind: [ OFF ]
> >> > ...                          zlib: [ OFF ]
> >> > ...                          lzma: [ OFF ]
> >> >
> >> > ...
> >> >
> >> >   AR       libperf.a
> >> >   LINK     perf
> >> > libperf.a(libperf-in.o): In function `parse_regs':
> >> > (.text+0x9f5b4): undefined reference to `sample_reg_masks'
> >> > libperf.a(libperf-in.o): In function `parse_regs':
> >> > (.text+0x9f604): undefined reference to `sample_reg_masks'
> >> > libperf.a(libperf-in.o): In function `parse_regs':
> >> > (.text+0x9f708): undefined reference to `sample_reg_masks'
> >> > collect2: error: ld returned 1 exit status
> >> > make[2]: *** [perf] Error 1
> >> > make[1]: *** [all] Error 2
> >> > make: *** [perf] Error 2
> >> >
> >> > On Tue, Aug 4, 2015 at 5:38 PM, Petri Gynther <pgynther@google.com> wrote:
> >> >> linux/tools$ make ARCH=mips CROSS_COMPILE=mipsel-linux- perf
> >> >> ...
> >> >> config/Makefile:256: *** No gnu/libc-version.h found, please install
> >> >> glibc-dev[el].  Stop.
> >> >> make[1]: *** [all] Error 2
> >> >> make: *** [perf] Error 2
> >> >>
> >> >> ...
> >> >> In file included from builtin-sched.c:13:0:
> >> >> util/cloexec.h:8:12: error: redundant redeclaration of ‘sched_getcpu’
> >> >>  [-Werror=redundant-decls]
> >> >>  extern int sched_getcpu(void) __THROW;
> >> >>
> >> >> mipsel-buildroot-linux-uclibc/sysroot/usr/include/bits/sched.h:88:12:
> >> >>  note: previous declaration of ‘sched_getcpu’ was here
> >> >>  extern int sched_getcpu (void) __THROW;
> >> >>
> >> >> uclibc info:
> >> >> sysroot/usr/include/bits/uClibc_config.h
> >> >> __UCLIBC_MAJOR__ 0
> >> >> __UCLIBC_MINOR__ 9
> >> >> __UCLIBC_SUBLEVEL__ 33
> >> >>
> >> >> sysroot/usr/include/features.h
> >> >> __UCLIBC__ 1
> >> >> __GLIBC__ 2
> >> >> __GLIBC_MINOR__ 2
> >> >>
> >> >> Signed-off-by: Petri Gynther <pgynther@google.com>
> >> >> ---
> >> >>  tools/build/feature/test-glibc.c | 11 +++++++++++
> >> >>  tools/perf/util/cloexec.h        |  2 +-
> >> >>  2 files changed, 12 insertions(+), 1 deletion(-)
> >> >>
> >> >> diff --git a/tools/build/feature/test-glibc.c b/tools/build/feature/test-glibc.c
> >> >> index b082034..9367f75 100644
> >> >> --- a/tools/build/feature/test-glibc.c
> >> >> +++ b/tools/build/feature/test-glibc.c
> >> >> @@ -1,8 +1,19 @@
> >> >> +#include <stdlib.h>
> >> >> +
> >> >> +#if !defined(__UCLIBC__)
> >> >>  #include <gnu/libc-version.h>
> >> >> +#else
> >> >> +#define XSTR(s) STR(s)
> >> >> +#define STR(s) #s
> >> >> +#endif
> >> >>
> >> >>  int main(void)
> >> >>  {
> >> >> +#if !defined(__UCLIBC__)
> >> >>         const char *version = gnu_get_libc_version();
> >> >> +#else
> >> >> +       const char *version = XSTR(__GLIBC__) "." XSTR(__GLIBC_MINOR__);
> >> >> +#endif
> >> >>
> >> >>         return (long)version;
> >> >>  }
> >> >> diff --git a/tools/perf/util/cloexec.h b/tools/perf/util/cloexec.h
> >> >> index 68888c2..3bee677 100644
> >> >> --- a/tools/perf/util/cloexec.h
> >> >> +++ b/tools/perf/util/cloexec.h
> >> >> @@ -4,7 +4,7 @@
> >> >>  unsigned long perf_event_open_cloexec_flag(void);
> >> >>
> >> >>  #ifdef __GLIBC_PREREQ
> >> >> -#if !__GLIBC_PREREQ(2, 6)
> >> >> +#if !__GLIBC_PREREQ(2, 6) && !defined(__UCLIBC__)
> >> >>  extern int sched_getcpu(void) __THROW;
> >> >>  #endif
> >> >>  #endif
> >> >> --
> >> >> 2.5.0.rc2.392.g76e840b
> >> >>