diff options
| author | pennae <github@quasiparticle.net> | 2021-12-21 19:34:40 +0100 |
|---|---|---|
| committer | pennae <github@quasiparticle.net> | 2022-03-03 17:47:49 +0100 |
| commit | 2799fe4cdbe77e017544f2fe61ae9baef650dbe6 (patch) | |
| tree | 21294b63e66563fd7e2cad66da3afb4865bdf625 /configure.ac | |
| parent | 609779086301a600f4282a629d586bba6b6a485c (diff) | |
enable LTO in optimized builds
gives 2-5% performance improvement across a board of tests.
LTO is broken when using clang; some libs link fine while others crash
the linker with a segfault in the llvm linker plugin. 🙁
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index 8a01c33ec..a86d88fad 100644 --- a/configure.ac +++ b/configure.ac @@ -147,6 +147,20 @@ if test "x$GCC_ATOMIC_BUILTINS_NEED_LIBATOMIC" = xyes; then LDFLAGS="-latomic $LDFLAGS" fi +# LTO is currently broken with clang for unknown reasons; ld segfaults in the llvm plugin +AC_ARG_ENABLE(lto, AS_HELP_STRING([--enable-lto],[Enable LTO (only supported with GCC) [default=no]]), + lto=$enableval, lto=no) +if test "$lto" = yes; then + if $CXX --version | grep -q GCC; then + AC_SUBST(CXXLTO, [-flto=jobserver]) + else + echo "error: LTO is only supported with GCC at the moment" >&2 + exit 1 + fi +else + AC_SUBST(CXXLTO, [""]) +fi + PKG_PROG_PKG_CONFIG AC_ARG_ENABLE(shared, AS_HELP_STRING([--enable-shared],[Build shared libraries for Nix [default=yes]]), |