diff options
| -rwxr-xr-x | configure | 42 |
1 files changed, 37 insertions, 5 deletions
@@ -125,6 +125,7 @@ debug=no warnings=no shared=yes static=yes +wrapper=auto for arg ; do case "$arg" in @@ -199,23 +200,33 @@ exit 1 fi # -# Only build musl-gcc wrapper if toolchain does not already target musl +# Need to know if the compiler is gcc to decide whether to build the +# musl-gcc wrapper, and for critical bug detection in some gcc versions. # -if test -z "$wrapper" ; then printf "checking whether compiler is gcc... " if fnmatch '*gcc\ version*' "$($CC -v 2>&1)" ; then -echo yes +cc_is_gcc=yes +else +cc_is_gcc=no +fi +echo "$cc_is_gcc" + +# +# Only build musl-gcc wrapper if toolchain does not already target musl +# +if test "$wrapper" = auto ; then printf "checking whether to build musl-gcc wrapper... " +if test "$cc_is_gcc" = yes ; then wrapper=yes while read line ; do case "$line" in */ld-musl-*) wrapper=no ;; esac done <<EOF $($CC -dumpspecs) EOF -echo $wrapper else -echo no +wrapper=no fi +echo "$wrapper" fi @@ -484,6 +495,27 @@ printf "no\n" fail "$0: error: unsupported long double type" fi +# +# Check for known bug in GCC 4.9.0 that results in a broken libc. +# +if test "$cc_is_gcc" = yes ; then +printf "checking for gcc constant folding bug with weak aliases... " +echo 'static int x = 0;' > "$tmpc" +echo 'extern int y __attribute__((__weak__, __alias__("x")));' >> "$tmpc" +echo 'extern int should_appear;' >> "$tmpc" +echo 'int foo() { return y ? should_appear : 0; }' >> "$tmpc" +case "$($CC $CFLAGS_C99FSE -I./arch/$ARCH -I./include \ + $CPPFLAGS $CFLAGS_AUTO $CFLAGS -S -o - "$tmpc" 2>/dev/null)" in +*should_appear*) +printf "no\n" +;; +*) +printf "yes\n" +fail "$0: error: broken compiler; try CFLAGS=-fno-toplevel-reorder" +;; +esac +fi + printf "creating config.mak... " cmdline=$(quote "$0") |