diff options
| -rw-r--r-- | configure.ac | 25 |
1 files changed, 20 insertions, 5 deletions
diff --git a/configure.ac b/configure.ac index be271c1159..44b7d61011 100644 --- a/configure.ac +++ b/configure.ac @@ -928,14 +928,29 @@ if test "${enable_more_logging}" = "yes"; then AC_DEFINE(NM_MORE_LOGGING, [1], [Define if more debug logging is enabled]) fi -AC_ARG_ENABLE(lto, AS_HELP_STRING([--enable-lto], [Enable Link Time Optimization for smaller size (default: no)])) -if (test "${enable_lto}" = "yes"); then +AC_ARG_ENABLE(lto, AS_HELP_STRING([--enable-lto], [Enable Link Time Optimization for smaller size (default: yes if supported)])) +if (test "${enable_lto}" != "no"); then + CFLAGS_SAVED="$CFLAGS" CFLAGS="-flto $CFLAGS" -else - enable_lto='no' + AC_MSG_CHECKING([whether compiler accepts -flto]) + AC_COMPILE_IFELSE([AC_LANG_SOURCE([ + /* Older GCC doesn't support serializing optimize() in gimple for LTO */ + #pragma GCC optimize("O0") + ])], [ + AC_MSG_RESULT(yes) + enable_lto="yes" + ],[ + AC_MSG_RESULT(no) + if (test "${enable_lto}" = "yes"); then + AC_MSG_ERROR([LTO requested but not supported.]) + else + CFLAGS="$CFLAGS_SAVED" + enable_lto="no" + fi + ]) + unset CFLAGS_SAVED fi - dnl ------------------------- dnl Vala bindings dnl ------------------------- |