https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121009
Bug ID: 121009
Summary: [libgomp]fwrite return value ignored in
libgomp/error.c causes build failure with
-Werror=unused-result
Product: gcc
Version: 14.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libgomp
Assignee: unassigned at gcc dot gnu.org
Reporter: dongjianqiang2 at huawei dot com
CC: jakub at gcc dot gnu.org
Target Milestone: ---
When building GCC/libgomp with -Werror=unused-result, the build fails due to
fwrite() return values being ignored in libgomp/error.c. This happens because
some versions of glibc declare fwrite() with
__attribute__((__warn_unused_result__)).
https://github.com/bminor/glibc/blob/glibc-2.8/libio/stdio.h#L685
This makes the build fail with:
gcc/libgomp/error.c: In function 'GOMP_warning':
gcc/libgomp/error.c:101:7: error: ignoring return value of 'fwrite', declared
with attribute warn_unused_result [-Werror=unused-result]
fwrite (msg, 1, msglen, stderr);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
gcc/libgomp/error.c: In function 'GOMP_error':
gcc/libgomp/error.c:116:7: error: ignoring return value of 'fwrite' declared
with attribute 'warn_unused_result' [-Werror=unused-result]
fwrite (msg, 1, msglen, stderr);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
