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configure: suppress "maybe uninitialized" warnings altogether unless -O3.

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We were just telling GCC not to treat them as errors: this suppresses them
entirely unless at -O3.  People keep trying to "fix" them, when in fact
they're false positives, as revealed with "./configure COPTFLAGS=-O3".

Fixes: #2856
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2019-07-31 19:59:26 +09:30 • committed by Christian Decker
parent 5a3ba1ce99
commit df298ba7e3
1 changed files with 2 additions and 2 deletions
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4
configure vendored
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@ -34,12 +34,12 @@ default_coptflags()
default_cwarnflags()
{
F=$BASE_WARNFLAGS
# Clang doesn't like -Wno-error=maybe-uninitialized, but doesn't seem
# Clang doesn't like -Wno-maybe-uninitialized, but doesn't seem
# to give spurious warnings, either.
if [ "$2" = 1 ]; then
# With old gccs, or optimization != -O3, we need to suppress some warnings.
if [ -n "${1##*-O3*}" ] || [ "$3" != "1" ]; then
F="$F -Wno-error=maybe-uninitialized"
F="$F -Wno-maybe-uninitialized"
fi
fi
echo "$F"