[gcc r12-3581] PowerPC: Fix rs6000-gen-builtins with build != host [PR102353]

[Tobias Burnus]

https://gcc.gnu.org/g:acd7e7b33fd576b336ca0bf5ec51f77b32ba51cc

commit r12-3581-gacd7e7b33fd576b336ca0bf5ec51f77b32ba51cc
Author: Tobias Burnus <tobias@codesourcery.com>
Date:   Thu Sep 16 18:35:34 2021 +0200

    PowerPC: Fix rs6000-gen-builtins with build != host [PR102353]
    
    This mimics what the main Makefile.in does: compile the generator
    files under build (with Makefile.in's 'build/%.o' rule for compilation).
    It also adds $(RUN_GEN) to optionally run it with valgrind and
    the $(build_exeext) suffix.
    
    Before, the .o files were compiled with $(COMPILE), causing link
    error with $(LINKER_FOR_BUILD) for build != host.
    
    gcc/
            PR target/102353
            * config/rs6000/t-rs6000 (build/rs6000-gen-builtins.o, build/rbtree.o):
            Added 'build/' to target, use build/%.o rule.
            (build/rs6000-gen-builtins$(build_exeext)): Add 'build/' and
            '$(build_exeext)' to target and 'build/' for the *.o files.
            (rs6000-builtins.c): Update for those changes; run rs6000-gen-builtins
            with $(RUN_GEN).

Diff:
---
 gcc/config/rs6000/t-rs6000 | 17 +++++++----------
 1 file changed, 7 insertions(+), 10 deletions(-)

diff --git a/gcc/config/rs6000/t-rs6000 b/gcc/config/rs6000/t-rs6000
index 92766d8ea25..d48a4b1be6c 100644
--- a/gcc/config/rs6000/t-rs6000
+++ b/gcc/config/rs6000/t-rs6000
@@ -44,15 +44,11 @@ rs6000-logue.o: $(srcdir)/config/rs6000/rs6000-logue.c
 	$(COMPILE) $<
 	$(POSTCOMPILE)
 
-rs6000-gen-builtins.o: $(srcdir)/config/rs6000/rs6000-gen-builtins.c
-	$(COMPILE) $<
-	$(POSTCOMPILE)
-
-rbtree.o: $(srcdir)/config/rs6000/rbtree.c
-	$(COMPILE) $<
-	$(POSTCOMPILE)
+build/rs6000-gen-builtins.o: $(srcdir)/config/rs6000/rs6000-gen-builtins.c
+build/rbtree.o: $(srcdir)/config/rs6000/rbtree.c
 
-rs6000-gen-builtins: rs6000-gen-builtins.o rbtree.o
+build/rs6000-gen-builtins$(build_exeext): build/rs6000-gen-builtins.o \
+					  build/rbtree.o $(BUILD_LIBDEPS)
 	$(LINKER_FOR_BUILD) $(BUILD_LINKERFLAGS) $(BUILD_LDFLAGS) -o $@ \
 	    $(filter-out $(BUILD_LIBDEPS), $^) $(BUILD_LIBS)
 
@@ -62,10 +58,11 @@ rs6000-gen-builtins: rs6000-gen-builtins.o rbtree.o
 #       <recipe>
 # For now, the header files depend on rs6000-builtins.c, which avoids
 # races because the .c file is closed last in rs6000-gen-builtins.c.
-rs6000-builtins.c: rs6000-gen-builtins \
+rs6000-builtins.c: build/rs6000-gen-builtins$(build_exeext) \
 		   $(srcdir)/config/rs6000/rs6000-builtin-new.def \
 		   $(srcdir)/config/rs6000/rs6000-overload.def
-	./rs6000-gen-builtins $(srcdir)/config/rs6000/rs6000-builtin-new.def \
+	$(RUN_GEN) ./build/rs6000-gen-builtins$(build_exeext) \
+		$(srcdir)/config/rs6000/rs6000-builtin-new.def \
 		$(srcdir)/config/rs6000/rs6000-overload.def rs6000-builtins.h \
 		rs6000-builtins.c rs6000-vecdefines.h