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Apply -flto only if compiler supports it

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Danny Robson 2011-07-04 16:19:07 +10:00 committed by U-steve\danny
parent 16afbccb3c
commit 6d52e37c93
1 changed files with 13 additions and 6 deletions
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19
configure.ac
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@ -22,11 +22,11 @@ AC_ARG_ENABLE([debugging],
[AS_HELP_STRING([--enable-debugging], [AS_HELP_STRING([--enable-debugging],
[enables developer debugging support])], [enables developer debugging support])],
[ case "${enableval}" in [ case "${enableval}" in
yes) cv_debugging=yes ;; yes) ac_cv_debugging=yes ;;
no) cv_debugging=no ;; no) ac_cv_debugging=no ;;
*) AC_MSG_ERROR([bad value for --enable-debugging=[yes|no]]) ;; *) AC_MSG_ERROR([bad value for --enable-debugging=[yes|no]]) ;;
esac ], esac ],
[cv_debugging=no]) [ac_cv_debugging=no])
## ##
## Warnings ## Warnings
@ -100,11 +100,18 @@ AM_CONDITIONAL([HAVE_EXECINFO], [test x$ac_cv_header_execinfo_h = "xyes"])
## ##
## Debug features ## Debug features
if test "x$cv_debugging" = "xyes"; then if test "x$ac_cv_debugging" = "xyes"; then
COMMON_CFLAGS="$COMMON_CFLAGS -O0 -D_GLIBCXX_DEBUG" COMMON_CFLAGS="$COMMON_CFLAGS -O0 -D_GLIBCXX_DEBUG"
else else
COMMON_CFLAGS="$COMMON_CFLAGS -O2 -flto" AS_CXX_COMPILER_FLAG([-flto], [ac_cv_flto=yes])
COMMON_LDFLAGS="-flto"
if test "x$ac_cv_flto" = "xyes"; then
COMMON_CFLAGS="$COMMON_CFLAGS -flto"
COMMON_LDFLAGS="-flto"
fi
COMMON_CFLAGS="$COMMON_CFLAGS -O2"
fi fi
## ##