diff options
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index 5035edb..2fb99a4 100644 --- a/configure.ac +++ b/configure.ac @@ -94,6 +94,25 @@ AC_ARG_ENABLE( ) AM_CONDITIONAL(ENABLE_WERROR, test x$enable_werror = xyes) +AC_ARG_ENABLE( + [lto], + AC_HELP_STRING( + [--enable-lto], + [ + Enables or Disables Linktime Code Optimization (LTO is disabled by default) + ] + ), + [ + enable_lto="$enableval" + case $enableval in + "no");; + "yes");; + *) AC_MSG_ERROR([[invalid argument --enable-lto=$enableval... stopping]]);; + esac + ], + [enable_lto="no"] +) + OLD_LDFLAGS="$LDFLAGS" LDFLAGS="$LDFLAGS -rdynamic" AC_MSG_CHECKING([whether $CC accepts -rdynamic]) @@ -151,6 +170,34 @@ AC_DEFUN([AC_CHECK_COMPILER_WFLAG], ] ) +if test "$enable_lto" != "no" ; then + OLD_CFLAGS="$CFLAGS" + CFLAGS="$CFLAGS -flto -ffat-lto-objects" + + OLD_LDFLAGS="$LDFLAGS" + LDFLAGS="$LDFLAGS -flto -ffat-lto-objects" + + AC_MSG_CHECKING([whether $CC supports -flto]) + AC_RUN_IFELSE( + [AC_LANG_SOURCE([ + int main(int argc, char **argv){ + return 0; + } + ])], + [ + AC_MSG_RESULT([yes]) + ], + [ + AC_MSG_RESULT([no]) + CFLAGS="$OLD_CFLAGS" + LDFLAGS="$OLD_LDFLAGS" + ], + [ + AC_MSG_RESULT([guessing no]) + ] + ) +fi + AC_DEFUN([AC_CHECK_SANITIZER_FLAG], [ AC_MSG_CHECKING([whether $CC supports -fsanitize=$1]) |