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partly revert detection of broken float in configure

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commit 80fbaac4cd1930e9545a5d36bf46ae49011d2ce8 broke all soft-float
archs, where gcc defines __GCC_IEC_559==0 because rounding modes and
exception flags are not supported. for now, just check for
__FAST_MATH__ as an indication of broken float. this won't detect all
possible misconfigurations but it probably catches the most common
one.
This commit is contained in:
Rich Felker 2016-02-18 04:09:33 +00:00
parent 157e28492a
commit 5030e4a060
1 changed files with 1 additions and 1 deletions
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2
configure vendored
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@ -660,7 +660,7 @@ fi
# for all packages. On recent GCC we can detect this and error out
# early rather than producing a seriously-broken math library.
#
if trycppif "__FAST_MATH__ || (defined(__GCC_IEC_559) && __GCC_IEC_559==0)" \
if trycppif "__FAST_MATH__" \
"$CFLAGS_C99FSE $CPPFLAGS $CFLAGS" ; then
fail "$0: error: compiler has broken floating point; check CFLAGS"
fi