fenv.h not found?

[Andy Gibbs]

On Tuesday, October 19, 2010 9:22 AM, Arnaud Lacombe wrote:

> Hi,
> [... snip ...]
>
>>> this looks odd. These last two `fenv.h' from GCC generally ends up in
>>> %SYSROOT%/include/c++/%GCC_VERSION%/, but not in your case. EGlibc
>>> header gets installed:
>>>
>>> [ALL ] /opt/cross/platforms/foo/xtools-build/tools/bin/install -c
>>> -m 644 ../sysdeps/powerpc/bits/fenv.h
>>> /opt/cross/platforms/foo/xtools/powerpc-e500v2-linux-gnuspe//sys-root/usr/include/bits/fenv.h
>>>
>>> then is overwritten by gcc:
>>>
>>> c_compatibility_headers_install='/opt/cross/platforms/foo/xtools-build/src/gcc-4.5.1/libstdc++-v3/include/c_compatibility/complex.h
>>> /opt/cross/platforms/foo/xtools-build/src/gcc-4.5.1/libstdc++-v3/include/c_compatibility/fenv.h
>>> /opt/cross/platforms/foo/xtools-build/src/gcc-4.5.1/libstdc++-v3/include/c_compatibility/tgmath.h
>>> /opt/cross/platforms/foo/xtools-build/src/gcc-4.5.1/libstdc++-v3/include/c_compatibility/stdatomic.h';
>>> for file in $c_compatibility_headers_install; do
>>> /opt/cross/platforms/foo/xtools-build/tools/bin/install -c -m 644
>>> $file 
>>> /opt/cross/platforms/foo/xtools/powerpc-e500v2-linux-gnuspe//sys-root/usr/include;
>>> done
>>>
>>> - Arnaud
>>>
>
> [... snip ...]
>hum, Yann's patch (which ) looks broken:
>
>+    if [ "${CT_CC_LANG_CXX}" = "y"   ]; then
>+ 
>extra_config+=("--with-gxx-include-dir=${CT_SYSROOT_DIR}/usr/include")
>+    fi
>+
>
>"${CT_SYSROOT_DIR}/usr/include" is "${CT_HEADERS_DIR}" where the libc
>is told to install its headers...
>
> [... snip ...]

Hello,

I hope nobody minds me adding my 2 cents... :o)

I built a cross-toolchain for powerpc with gcc 4.5.1, eglibc 2.12 and had 
the problem mentioned in Arnaud's post above re eglibc's fenv.h being 
overwritten with gcc's one.  This meant it failed to compile Qt, since gcc's 
fenv.h used an #include_next directive and it couldn't find the necessary 
fenv.h file in the include path.  Rolling back the patch mentioned above, 
and also the change where the symlink path was deleted (see 
http://sourceware.org/ml/crossgcc/2010-10/msg00149.html) solved the problem 
for me.

Thanks Arnaud!

Andy



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