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build: fix musl-targeting toolchain test

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the old test was broken in that it would never fail on a toolchains built
without dynamic linking support, leading to the wrapper script possibly being
installed on compilers that do not support it. in addition, the new test is
portable across compilers: the old test only worked on GCC.

the new test works by testing whether the toolchain libc defines __GLIBC__:
most non-musl Linux libc's do define this for compatibility even when they
are not glibc, so this is a safe bet to check for musl. in addition, the
compiler runtime would need to have a somewhat glibc-compatible ABI in the
first place, so any non-glibc compatible libc's compiler runtime might not
work. it is safer to disable these cases by default and have the user enable
the wrappers manually there using --enable-wrapper if they certain it works.
This commit is contained in:
Shiz 2015-06-28 23:08:20 +02:00 committed by Rich Felker
parent b3cd7d13fe
commit f8db6f74b2
1 changed files with 8 additions and 9 deletions
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17
configure vendored
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@ -237,17 +237,16 @@ echo "$cc_family"
# Figure out toolchain wrapper to build # Figure out toolchain wrapper to build
# #
if test "$wrapper" = auto -o "$wrapper" = detect ; then if test "$wrapper" = auto -o "$wrapper" = detect ; then
echo "#include <stdlib.h>" > "$tmpc"
echo "#if ! __GLIBC__" >> "$tmpc"
echo "#error no" >> "$tmpc"
echo "#endif" >> "$tmpc"
printf "checking for toolchain wrapper to build... " printf "checking for toolchain wrapper to build... "
if test "$cc_family" = gcc ; then if test "$wrapper" = auto && ! $CC -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
echo "none"
elif test "$cc_family" = gcc ; then
gcc_wrapper=yes gcc_wrapper=yes
if test "$wrapper" = auto ; then echo "gcc"
while read line ; do
case "$line" in */ld-musl-*) gcc_wrapper=no ;; esac
done <<EOF
$($CC -dumpspecs)
EOF
fi
test "$gcc_wrapper" = yes && echo "gcc"
else else
echo "none" echo "none"
if test "$wrapper" = detect ; then if test "$wrapper" = detect ; then