[Buildroot] [Bug 8786] New: gdb fails to build with xz and expat support at the same

[Buildroot] [Bug 8786] New: gdb fails to build with xz and expat support at the same

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=8786

            Bug ID: 8786
           Summary: gdb fails to build with xz and expat support at the
                    same
           Product: buildroot
           Version: unspecified
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Other
          Assignee: unassigned at buildroot.uclibc.org
          Reporter: vincent.riera at imgtec.com
                CC: buildroot at uclibc.org
  Target Milestone: ---

For some reason gdb fails to build with xz and expat support at the same
time when using an external toolchain.

This is how the problem is shown:

checking for liblzma... no
configure: error: missing liblzma for --with-lzma

Try this defconfig if you want to reproduce the problem:

BR2_x86_64=y
BR2_TOOLCHAIN_EXTERNAL=y
BR2_PACKAGE_XZ=y
BR2_PACKAGE_GDB=y
BR2_PACKAGE_GDB_DEBUGGER=y
BR2_PACKAGE_EXPAT=y

Using the above defconfig, the error in the gdb/config.log will look
like this:

configure:13241: checking whether to use lzma
configure:13243: result: yes
configure:13657: checking for liblzma
configure:13678: /br/output/host/usr/bin/i686-pc-linux-gnu-gcc -o
conftest -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
-D_FILE_OFFSET_BITS=64  -Os
-I/br/output/host/usr/x86_64-buildroot-linux-gnu/sysroot/usr/include
-static-libstdc++ -static-libgcc  conftest.c -ldl -ldl -lncurses -lm
-ldl    /usr/lib/liblzma.so >&5
/lib64/liblzma.so.5: undefined reference to `clock_gettime at GLIBC_2.17'
collect2: error: ld returned 1 exit status

You can also use this defconfig to reproduce the problem for MIPS:

BR2_mips=y
BR2_mips_32r2=y
BR2_TOOLCHAIN_EXTERNAL=y
BR2_PACKAGE_XZ=y
BR2_PACKAGE_GDB=y
BR2_PACKAGE_GDB_DEBUGGER=y
BR2_PACKAGE_EXPAT=y

In that case the error will look like this:

configure:13241: checking whether to use lzma
configure:13243: result: yes
configure:13657: checking for liblzma
configure:13678: /br/output/host/usr/bin/mips-linux-gnu-gcc -o conftest
-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -Os
 -I/br/output/host/usr/mips-buildroot-linux-gnu/sysroot/usr/include
-static-libstdc++ -static-libgcc  conftest.c -ldl -ldl -lncurses -lm
-ldl    /usr/lib/liblzma.so >&5
/br/output/host/opt/ext-toolchain/bin/../lib/gcc/mips-linux-gnu/5.2.0/../../../../mips-linux-gnu/bin/ld:
skipping incompatible /lib64/liblzma.so.5 when searching for
/lib64/liblzma.so.5
/br/output/host/opt/ext-toolchain/bin/../lib/gcc/mips-linux-gnu/5.2.0/../../../../mips-linux-gnu/bin/ld:
cannot find /lib64/liblzma.so.5
collect2: error: ld returned 1 exit status

You can also use this defconfig to reproduce the problem for ARM:

BR2_arm=y
BR2_cortex_a7=y
BR2_TOOLCHAIN_EXTERNAL=y
BR2_PACKAGE_XZ=y
BR2_PACKAGE_GDB=y
BR2_PACKAGE_GDB_DEBUGGER=y
BR2_PACKAGE_EXPAT=y

In that case the error will look like this:

configure:13241: checking whether to use lzma
configure:13243: result: yes
configure:13657: checking for liblzma
configure:13678: /br/output/host/usr/bin/arm-linux-gnueabihf-gcc -o
conftest -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
-D_FILE_OFFSET_BITS=64  -Os
-I/br/output/host/usr/arm-buildroot-linux-gnueabihf/sysroot/usr/include
-static-libstdc++ -static-libgcc  conftest.c -ldl -ldl -lncurses -lm
-ldl    /usr/lib/liblzma.so >&5
/lib64/liblzma.so.5: file not recognized: File format not recognized
collect2: error: ld returned 1 exit status

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[Buildroot] [Bug 8786] gdb fails to build with xz and expat support at the same

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=8786

--- Comment #1 from Thomas Petazzoni <thomas.petazzoni@free-electrons.com> ---
The problem seems related to the fact that you have lzma installed on your
build machine, including the development files.

I've tested your last defconfig (on ARM), and I'm not able to reproduce, either
with lzma development files installed or not installed.

The failure:

/lib64/liblzma.so.5: undefined reference to `clock_gettime at GLIBC_2.17'

is related to the fact that it finds your host lzma, tries to link with it, but
fails because it lacks -lrt.

Can you try --with-lzma-prefix=$(HOST_DIR)/usr in GDB_CONF_OPTS ?

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[Buildroot] [Bug 8786] gdb fails to build with xz and expat support at the same

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=8786

--- Comment #2 from Vicente Olivert Riera <vincent.riera@imgtec.com> ---
That fixes the problem. I've sent a patch:

http://patchwork.ozlabs.org/patch/595861/

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[Buildroot] [Bug 8786] gdb fails to build with xz and expat support at the same

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=8786

Thomas Petazzoni <thomas.petazzoni@free-electrons.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #3 from Thomas Petazzoni <thomas.petazzoni@free-electrons.com> ---
Fixed in e6a29a4f3c48b13fde2214365067e34fbb92cfd6.

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