From c6be439b37702f6ac4c2fc447c6f3ed1042b80a3 Mon Sep 17 00:00:00 2001 From: Alan Modra Date: Mon, 28 Sep 2020 16:23:01 +0930 Subject: [RS6000] -mno-minimal-toc vs. power10 pcrelative We've had this hack in the libgcc config to build libgcc with -mcmodel=small for powerpc64 for a long time. It wouldn't be a bad thing if someone who knows the multilib machinery well could arrange for -mcmodel=small to be passed just for ppc64 when building for earlier than power10. But for now, make -mno-minimal-toc do nothing when pcrel. Which will do the right thing for any project that has copied libgcc's trick. We want this if configuring using --with-cpu=power10 to build a power10 pcrel libgcc. --mcmodel=small turns off pcrel. gcc/ * config/rs6000/linux64.h (SUBSUBTARGET_OVERRIDE_OPTIONS): Don't set -mcmodel=small for -mno-minimal-toc when pcrel. libgcc/ * config/rs6000/t-linux: Document purpose of -mno-minimal-toc. --- libgcc/config/rs6000/t-linux | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) (limited to 'libgcc') diff --git a/libgcc/config/rs6000/t-linux b/libgcc/config/rs6000/t-linux index 4f6d4c4..ed82194 100644 --- a/libgcc/config/rs6000/t-linux +++ b/libgcc/config/rs6000/t-linux @@ -1,3 +1,8 @@ SHLIB_MAPFILES += $(srcdir)/config/rs6000/libgcc-glibc.ver -HOST_LIBGCC2_CFLAGS += -mlong-double-128 -mno-minimal-toc +HOST_LIBGCC2_CFLAGS += -mlong-double-128 + +# This is a way of selecting -mcmodel=small for ppc64, which gives +# smaller and faster libgcc code. Directly specifying -mcmodel=small +# would need to take into account targets for which -mcmodel is invalid. +HOST_LIBGCC2_CFLAGS += -mno-minimal-toc -- cgit v1.1