GLIBC Compile Error: Implicit Declaration of Function

Question

I am trying to compile GLIBC from source however during that process I get the following error:

../sysdeps/ieee754/flt-32/e_gammaf_r.c: In function ‘__ieee754_gammaf_r’:
../sysdeps/ieee754/flt-32/e_gammaf_r.c:127:32: error: implicit declaration of function ‘__builtin_roundeven’; did you mean ‘__builtin_round’? [-Werror=implicit-function-declaration]
   double m = z - 0x1.7p+1, i = __builtin_roundeven(m), step = __builtin_copysign(1.0,i);
                                ^~~~~~~~~~~~~~~~~~~
                                __builtin_round
cc1: all warnings being treated as errors

I have tried compiling using the following:

git clone https://sourceware.org/git/glibc.git glibc-devel
cd glibc-devel
mkdir build
cd build
../configure --prefix=/home/a0504063/bin/python/glibc --host=x86_64-linux-gnu --build=x86_64-linux-gnu CC="gcc -m64" CXX="g++ -m64" CFLAGS="-O2 -Wno-error" CXXFLAGS="-O2 -Wno-error"
make

This yields the above error. As is demonstrated in the configure command I am using -Wno-error to try and suppress the default "all warnings being treated as errors" behavior. However, this option is prepended to the default options list which causes it to be ignored.

I am currently using:

git commit hash: 18596c5415
gcc/g++ version: 8.5.0
OS: RedHat 8 (this is what the company servers currently run and I have no option to change)

someone fixed this bug 4 days ago ... patchwork.sourceware.org/project/glibc/patch/… not sure when it will hit mainstream as it is under review, you can try downgrading glibc in the mean time — Ahmed AEK
– Ahmed AEK, Commented Oct 28, 2024 at 21:39

Employed Russian · Accepted Answer · 2024-10-30 05:55:11Z

1

gcc/g++ version: 8.5.0

Your GCC is too old.

From the patch comment:

__builtin_roundeven is not support on gcc older than version 10.

Your options are:

use older GLIBC sources
use newer GCC
apply above patch
wait for that patch to be committed, and then build newest GLIBC sources

P.S. GLIBC-2.32 release notes show that it was tested on x86_64 using GCC 8.2.1.

So using latest released GLIBC version should be fine with your version of GCC.

edited Oct 30, 2024 at 5:55

answered Oct 30, 2024 at 5:49

Employed Russian

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