Issue #25702: A --with-lto configure option has been added that will
enable link time optimizations at build time during a make profile-opt.
diff --git a/Makefile.pre.in b/Makefile.pre.in
index cfa6a5f..17c0b57 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -504,7 +504,7 @@
$(MAKE) profile-removal
build_all_generate_profile:
- $(MAKE) all CFLAGS_NODIST="$(CFLAGS) $(PGO_PROF_GEN_FLAG)" LDFLAGS="$(LDFLAGS) $(PGO_PROF_GEN_FLAG)" LIBS="$(LIBS)"
+ $(MAKE) all CFLAGS_NODIST="$(CFLAGS) $(PGO_PROF_GEN_FLAG) @LTOFLAGS@" LDFLAGS="$(LDFLAGS) $(PGO_PROF_GEN_FLAG) @LTOFLAGS@" LIBS="$(LIBS)"
run_profile_task:
: # FIXME: can't run for a cross build
@@ -514,7 +514,7 @@
$(LLVM_PROF_MERGER)
build_all_use_profile:
- $(MAKE) all CFLAGS_NODIST="$(CFLAGS) $(PGO_PROF_USE_FLAG)"
+ $(MAKE) all CFLAGS_NODIST="$(CFLAGS) $(PGO_PROF_USE_FLAG) @LTOFLAGS@" LDFLAGS="$(LDFLAGS) @LTOFLAGS@"
# Compile and run with gcov
.PHONY=coverage coverage-lcov coverage-report