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authorShiz <hi@shiz.me>2015-05-28 05:52:22 +0200
committerRich Felker <dalias@aerifal.cx>2015-05-28 00:08:13 -0400
commitfc431d3f76bb9bde34a89e4a3e4d0c27de959855 (patch)
treeffffc8d5e72e6283515ecf32cdf3e8bcbd7f39c8 /configure
parentaeeac9ca5490d7d90fe061ab72da446c01ddf746 (diff)
downloadmusl-fc431d3f76bb9bde34a89e4a3e4d0c27de959855.tar.gz
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.
Diffstat (limited to 'configure')
-rwxr-xr-xconfigure14
1 files changed, 12 insertions, 2 deletions
diff --git a/configure b/configure
index 143dc927..7b29ae40 100755
--- a/configure
+++ b/configure
@@ -80,7 +80,7 @@ fi
tryflag () {
printf "checking whether compiler accepts %s... " "$2"
echo "typedef int x;" > "$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"
eval "$1=\"\${$1} \$2\""
eval "$1=\${$1# }"
@@ -94,7 +94,7 @@ fi
tryldflag () {
printf "checking whether linker accepts %s... " "$2"
echo "typedef int x;" > "$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"
eval "$1=\"\${$1} \$2\""
eval "$1=\${$1# }"
@@ -113,7 +113,9 @@ CFLAGS_C99FSE=
CFLAGS_AUTO=
CFLAGS_MEMOPS=
CFLAGS_NOSSP=
+CFLAGS_TRY=
LDFLAGS_AUTO=
+LDFLAGS_TRY=
OPTIMIZE_GLOBS=
prefix=/usr/local/musl
exec_prefix='$(prefix)'
@@ -205,6 +207,14 @@ exit 1
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
# musl-gcc wrapper, and for critical bug detection in some gcc versions.
#