diff options
| author | Costa Tsaousis (ktsaou) <costa@tsaousis.gr> | 2017-03-11 23:53:23 +0200 |
|---|---|---|
| committer | Costa Tsaousis (ktsaou) <costa@tsaousis.gr> | 2017-03-11 23:53:23 +0200 |
| commit | cdf6740f46999b1b15665feb9eea7593c0aafc3c (patch) | |
| tree | 50b138bf4c54a57b7d80a0f1c5e7116690e76a96 /configure.ac | |
| parent | 14d788984fb3248c4b7fd5d52aa2d688421ee163 (diff) | |
enable link-time-optimizations by default
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 25 |
1 files changed, 24 insertions, 1 deletions
diff --git a/configure.ac b/configure.ac index 81af5a0a1e..47f8153a43 100644 --- a/configure.ac +++ b/configure.ac @@ -101,6 +101,12 @@ AC_ARG_ENABLE( , [enable_x86_sse="yes"] ) +AC_ARG_ENABLE( + [lto], + [AS_HELP_STRING([--disable-lto], [Link Time Optimizations @<:@default enabled@:>@])], + , + [enable_lto="detect"] +) # ----------------------------------------------------------------------------- @@ -145,6 +151,7 @@ AC_CHECK_HEADERS_ONCE([sys/prctl.h]) # ----------------------------------------------------------------------------- # operating system detection +AC_MSG_CHECKING([operating system]) case "$host_os" in freebsd*) build_target=freebsd @@ -161,6 +168,7 @@ esac AM_CONDITIONAL([FREEBSD], [test "${build_target}" = "freebsd"]) AM_CONDITIONAL([MACOS], [test "${build_target}" = "macos"]) AM_CONDITIONAL([LINUX], [test "${build_target}" = "linux"]) +AC_MSG_RESULT([${build_target}]) # ----------------------------------------------------------------------------- @@ -173,8 +181,23 @@ AS_CASE([$host_cpu], AC_SUBST([SSE_CANDIDATE]) if test "${SSE_CANDIDATE}" = "yes" -a "${enable_x86_sse}" = "yes"; then opt="-msse2 -mfpmath=sse" - AX_CHECK_COMPILE_FLAG($opt, [CFLAGS="$CFLAGS $opt"], []) + AX_CHECK_COMPILE_FLAG(${opt}, [CFLAGS="${CFLAGS} ${opt}"], []) +fi + +if test "${enable_lto}" != "no"; then + opt="-flto" + AX_CHECK_COMPILE_FLAG(${opt}, [have_lto=yes], [have_lto=no]) +fi +test "${enable_lto}" = "yes" -a "${have_lto}" != "yes" && \ + AC_MSG_ERROR([LTO is required but is not available.]) +AC_MSG_CHECKING([if LTO should be enabled]) +if test "${enable_lto}" != "no" -a "${have_lto}" = "yes"; then + enable_lto="yes" + CFLAGS="${CFLAGS} -flto" +else + enable_lto="no" fi +AC_MSG_RESULT([${enable_lto}]) if test "${GCC}" = "yes"; then AC_DEFINE_UNQUOTED([likely(x)], [__builtin_expect(!!(x), 1)], [gcc branch optimization]) |