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configure: work around compilers that merely warn for unknown options 

some compilers (such as clang) accept unknown options without error,
but then print warnings on each invocation, cluttering the build
output and burying meaningful warnings. this patch makes configure's
tryflag and tryldflag functions use additional options to turn the
unknown-option warnings into errors, if available, but only at check
time. these options are not output in config.mak to avoid the risk of
spurious build breakage; if they work, they will have already done
their job at configure time.
This commit is contained in:
Shiz 2015-05-28 05:52:22 +02:00 committed by Rich Felker
parent aeeac9ca54
commit fc431d3f76
1 changed files with 12 additions and 2 deletions
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14
configure vendored
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@ -80,7 +80,7 @@ fi
tryflag () { tryflag () {
printf "checking whether compiler accepts %s... " "$2" printf "checking whether compiler accepts %s... " "$2"
echo "typedef int x;" > "$tmpc" echo "typedef int x;" > "$tmpc"
if $CC $2 -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then if $CC $CFLAGS_TRY $2 -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
printf "yes\n" printf "yes\n"
eval "$1=\"\${$1} \$2\"" eval "$1=\"\${$1} \$2\""
eval "$1=\${$1# }" eval "$1=\${$1# }"
@ -94,7 +94,7 @@ fi
tryldflag () { tryldflag () {
printf "checking whether linker accepts %s... " "$2" printf "checking whether linker accepts %s... " "$2"
echo "typedef int x;" > "$tmpc" echo "typedef int x;" > "$tmpc"
if $CC -nostdlib -shared "$2" -o /dev/null "$tmpc" >/dev/null 2>&1 ; then if $CC $LDFLAGS_TRY -nostdlib -shared "$2" -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
printf "yes\n" printf "yes\n"
eval "$1=\"\${$1} \$2\"" eval "$1=\"\${$1} \$2\""
eval "$1=\${$1# }" eval "$1=\${$1# }"
@ -113,7 +113,9 @@ CFLAGS_C99FSE=
CFLAGS_AUTO= CFLAGS_AUTO=
CFLAGS_MEMOPS= CFLAGS_MEMOPS=
CFLAGS_NOSSP= CFLAGS_NOSSP=
CFLAGS_TRY=
LDFLAGS_AUTO= LDFLAGS_AUTO=
LDFLAGS_TRY=
OPTIMIZE_GLOBS= OPTIMIZE_GLOBS=
prefix=/usr/local/musl prefix=/usr/local/musl
exec_prefix='$(prefix)' exec_prefix='$(prefix)'
@ -204,6 +206,14 @@ printf "no; compiler output follows:\n%s\n" "$output"
exit 1 exit 1
fi fi
#
# Figure out options to force errors on unknown flags.
#
tryflag CFLAGS_TRY -Werror=unknown-warning-option
tryflag CFLAGS_TRY -Werror=unused-command-line-argument
tryldflag LDFLAGS_TRY -Werror=unknown-warning-option
tryldflag LDFLAGS_TRY -Werror=unused-command-line-argument
# #
# Need to know if the compiler is gcc to decide whether to build the # Need to know if the compiler is gcc to decide whether to build the
# musl-gcc wrapper, and for critical bug detection in some gcc versions. # musl-gcc wrapper, and for critical bug detection in some gcc versions.