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configure: check for -march and -mtune passed via CC 

Some build environments pass -march and -mtune as part of CC, therefore
update configure to check both CC and CFLAGS before making the decision
to fall back to generic -march and -mtune options for x86.

Signed-off-by: Andre McCurdy <armccurdy@gmail.com>
This commit is contained in:
Andre McCurdy 2015-04-21 10:34:05 -07:00 committed by Rich Felker
parent ea1b6bb612
commit a6274a1971
1 changed files with 4 additions and 2 deletions
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6
configure vendored
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@ -391,10 +391,12 @@ tryflag CFLAGS_AUTO -Wa,--noexecstack
# extensions enabled by default. This is bad for making static binaries.
# We cheat and use i486 rather than i386 because i386 really does not
# work anyway (issues with atomic ops).
# Some build environments pass -march and -mtune options via CC, so
# check both CC and CFLAGS.
#
if test "$ARCH" = "i386" ; then
fnmatch '-march=*|*\ -march=*' "$CFLAGS" || tryldflag CFLAGS_AUTO -march=i486
fnmatch '-mtune=*|*\ -mtune=*' "$CFLAGS" || tryldflag CFLAGS_AUTO -mtune=generic
fnmatch '-march=*|*\ -march=*' "$CC $CFLAGS" || tryldflag CFLAGS_AUTO -march=i486
fnmatch '-mtune=*|*\ -mtune=*' "$CC $CFLAGS" || tryldflag CFLAGS_AUTO -mtune=generic
fi
#