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Check gcc support for -Wno-unused-result 

We're using -Wno-unused-result to work around what is arguably a GCC
bug, but this option is not supported on older GCC versions.  So on
those versions we won't pass -Werror either.

ref: commit b874048efc
This commit is contained in:
Travis Cross 2014-08-28 13:29:23 +00:00
parent fa08c6b8db
commit 1c058e0f45
1 changed files with 17 additions and 2 deletions
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19
configure.ac
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@ -331,6 +331,17 @@ if test "${LIBTOOL_MAJOR_VERSION}" = "2" ; then
fi fi
AC_MSG_RESULT([using libtool library extension... ${LIBTOOL_LIB_EXTEN}]) AC_MSG_RESULT([using libtool library extension... ${LIBTOOL_LIB_EXTEN}])
if test "$ax_cv_c_compiler_vendor" = "gnu"; then
saved_CFLAGS="$CFLAGS"
AC_CACHE_CHECK([whether compiler supports -Wno-unused-result],
[ac_cv_gcc_supports_w_no_unused_result], [
CFLAGS="$CFLAGS -Wno-unused-result"
AC_TRY_COMPILE([],[return 0;],
[ac_cv_gcc_supports_w_no_unused_result=yes],
[ac_cv_gcc_supports_w_no_unused_result=no])])
CFLAGS="$saved_CFLAGS"
AC_MSG_RESULT($ac_cv_gcc_supports_w_no_unused_result)
fi
# tweak compiler specific flags # tweak compiler specific flags
if test "x${ax_cv_c_compiler_vendor}" = "xsun" ; then if test "x${ax_cv_c_compiler_vendor}" = "xsun" ; then
@ -360,7 +371,9 @@ elif test "x${ax_cv_c_compiler_vendor}" = "xclang" ; then
elif test "x${ax_cv_c_compiler_vendor}" = "xgnu" ; then elif test "x${ax_cv_c_compiler_vendor}" = "xgnu" ; then
APR_ADDTO(SWITCH_AM_CFLAGS, -fPIC) APR_ADDTO(SWITCH_AM_CFLAGS, -fPIC)
APR_ADDTO(SWITCH_AM_CXXFLAGS, -fPIC) APR_ADDTO(SWITCH_AM_CXXFLAGS, -fPIC)
APR_ADDTO(SWITCH_AM_CFLAGS, -Werror) if test "$ac_cv_gcc_supports_w_no_unused_result" = yes; then
APR_ADDTO(SWITCH_AM_CFLAGS, -Werror)
fi
if test "${enable_64}" = "yes"; then if test "${enable_64}" = "yes"; then
case "$host" in case "$host" in
*darwin12.*|*darwin11.*|*darwin10.*|*darwin9.*|*darwin8.*) *darwin12.*|*darwin11.*|*darwin10.*|*darwin9.*|*darwin8.*)
@ -464,7 +477,9 @@ if test "${enable_debug}" = "yes"; then
CFLAGS="$saved_CFLAGS" CFLAGS="$saved_CFLAGS"
if test "x${ax_cv_c_compiler_vendor}" = "xgnu" ; then if test "x${ax_cv_c_compiler_vendor}" = "xgnu" ; then
APR_ADDTO(SWITCH_AM_CFLAGS, -Wno-unused-result) if test "$ac_cv_gcc_supports_w_no_unused_result" = yes; then
APR_ADDTO(SWITCH_AM_CFLAGS, -Wno-unused-result)
fi
APR_ADDTO(SWITCH_AM_CFLAGS, -g -ggdb) APR_ADDTO(SWITCH_AM_CFLAGS, -g -ggdb)
export DEBUG_CFLAGS="-g -ggdb" export DEBUG_CFLAGS="-g -ggdb"
fi fi