nvptx: Introduce dummy multilib option for default '-misa=sm_30'

... primarily in preparation for later changes.

	gcc/
	* config.gcc (TM_MULTILIB_CONFIG) [nvptx]: Set to '$with_arch'.
	* config/nvptx/t-nvptx (MULTILIB_OPTIONS, MULTILIB_MATCHES)
	(MULTILIB_EXCEPTIONS): Handle it.

diff --git a/gcc/config.gcc b/gcc/config.gcc
index 6a47661e647ff1aa71ddbd05e9685ff53fc139bc..d130f49699dcd102bc65d33d611a513e9369ea71 100644 (file)
--- a/gcc/config.gcc
+++ b/gcc/config.gcc
@@ -5298,6 +5298,7 @@ case "${target}" in
 
        nvptx-*)
                supported_defaults=arch
+               TM_MULTILIB_CONFIG=$with_arch
                case $with_arch in
                        sm_30 )
                                # OK; default.

diff --git a/gcc/config/nvptx/t-nvptx b/gcc/config/nvptx/t-nvptx
index 2b68149ed7e68d0fad7b0de559ea116de559a475..c797d57690f4a355b7a88c4d8700bc9fc9695d0d 100644 (file)
--- a/gcc/config/nvptx/t-nvptx
+++ b/gcc/config/nvptx/t-nvptx
@@ -31,4 +31,22 @@ s-nvptx-gen-opt: $(srcdir)/config/nvptx/nvptx-sm.def \
          tmp-nvptx-gen.opt $(srcdir)/config/nvptx/nvptx-gen.opt
        $(STAMP) s-nvptx-gen-opt
 
-MULTILIB_OPTIONS = mgomp mptx=3.1
+
+# Multilib setup.
+
+MULTILIB_OPTIONS =
+MULTILIB_MATCHES =
+MULTILIB_EXCEPTIONS =
+
+MULTILIB_OPTIONS += mgomp
+
+multilib_options_isa_list := $(TM_MULTILIB_CONFIG)
+multilib_options_isa_default := $(word 1,$(multilib_options_isa_list))
+# Add the default '-misa' as a multilib option:
+MULTILIB_OPTIONS += misa=$(multilib_options_isa_default)
+# ..., but don't handle it specially (remap to default):
+MULTILIB_MATCHES += .=misa?$(multilib_options_isa_default)
+# ..., and don't actually build it:
+MULTILIB_EXCEPTIONS += *misa=$(multilib_options_isa_default)*
+
+MULTILIB_OPTIONS += mptx=3.1