Re: powerpc/sparc problems

[Pavel Roskin <proski@gnu.org>]

On Thu, 2009-10-15 at 13:58 +0200, Vladimir 'phcoder' Serbinenko wrote:

> The methods discussed in this thread are good but aren't for release. So
> I just reverted Pavel's commit

My cross-build for sparc64 fails now:

__bswapsi2 in fat is not defined

This can be traced to the following part of config.log:

configure:7314: checking for __bswapsi2
configure:7370: sparc64-linux-uclibc-gcc -o conftest -Wall -W -Wshadow
-Wpointer-arith -Wmissing-prototypes                  -Wundef
-Wstrict-prototypes -g -Os -m64 -fno-stack-protector -Werror -nostdlib
-Wl,--defsym,___main=0x8100   -m64 conftest.c  >&5
In file included
from /opt/sparc/usr/lib/gcc/sparc64-linux-uclibc/4.3.3/include-fixed/syslimits.h:7,

from /opt/sparc/usr/lib/gcc/sparc64-linux-uclibc/4.3.3/include-fixed/limits.h:11,
                 from conftest.c:38:
/opt/sparc/usr/lib/gcc/sparc64-linux-uclibc/4.3.3/include-fixed/limits.h:122:61: error: no include path in which to search for limits.h
cc1: warnings being treated as errors
conftest.c:51: error: function declaration isn't a prototype
configure:7377: $? = 1

The reason limits.h is missing is because I failed to compile uClibc for
sparc64 using buildroot.

But even if I create an empty /opt/sparc/usr/include/limits.h, the test
fails:

configure:7314: checking for __bswapsi2
configure:7370: gcc -o conftest -Wall -W -Wshadow -Wpointer-arith
-Wmissing-prototypes                  -Wundef -Wstrict-prototypes -g -Os
-fno-dwarf2-cfi-asm -m64 -fno-stack-protector -mno-stack-arg-probe
-Werror -nostdlib -Wl,--defsym,___main=0x8100   -m64 conftest.c  >&5
cc1: warnings being treated as errors
conftest.c:51: error: function declaration isn't a prototype
configure:7377: $? = 1

I'm afraid it's a real bug that would affect native compilation.  We
should move adding -Werror to TARGET_CFLAGS after all checks.

Even after I do that, I still get:

configure:7305: checking for __bswapsi2
configure:7361: gcc -o conftest -Wall -W -Wshadow -Wpointer-arith
-Wmissing-prototypes                  -Wundef -Wstrict-prototypes -g -Os
-fno-dwarf2-cfi-asm -m64 -fno-stack-protector -mno-stack-arg-probe
-nostdlib -Wl,--defsym,___main=0x8100   -m64 conftest.c  >&5
conftest.c:51: warning: function declaration isn't a prototype
/usr/bin/ld: warning: cannot find entry symbol _start; defaulting to
0000000000400144
/tmp/ccoCvQMe.o: In function `main':
/home/proski/src/grub2.git/build-ieee1275-sparc64-linux-uclibc/conftest.c:62: undefined reference to `__bswapsi2'
collect2: ld returned 1 exit status
configure:7368: $? = 1

That may or may not be due to the lack of the libc.  I tried checking
for __ashldi3, which is exported unconditionally on PowerPC, and the
check fails, even though I have libc for PowerPC.  That's also a
cross-compiler, but I can test it on a PowerMac if necessary.

This makes me think that checks for __bswapsi2 and  __bswapdi2 will fail
on Sparc64, even if those functions are present and even if
--disable-werror is used.

-- 
Regards,
Pavel Roskin