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build: ask for -std=gnu99 explicitly

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We previously got -std=gnu99 secretly enabled as a side-effect
of requesting the 'stdarg' gnulib module. We rely on some
extensions from c99/gnu99 and while RHEL-7 supports this, it
still defaults to gnu89.  RHEL-7 also supports some newer
standards but declares them experimental/incomplete, so sticking
with gnu99 is best bet for now & matches historical usage.

Reviewed-by: Fabiano Fidêncio <fidencio@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
This commit is contained in:
Daniel P. Berrangé 2019-10-07 14:07:28 +01:00
parent 8ab67fb64f
commit 23605f58bf
1 changed files with 5 additions and 0 deletions
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5
m4/virt-compile-warnings.m4
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@ -189,6 +189,11 @@ AC_DEFUN([LIBVIRT_COMPILE_WARNINGS],[
wantwarn="$wantwarn -Werror"
fi
# Request the gnu99 standard which is the best choice with
# gcc 4.8.0. Not a warning flag, but the probing mechanism
# is convenient
wantwarn="-std=gnu99"
# Check for $CC support of each warning
for w in $wantwarn; do
gl_WARN_ADD([$w])