[Darwin] Some TLC for older Darwin versions.

The library handling and some of the options for creating the crts for
the older PPC Darwin versions had bit-rotted somewhat.  This adjusts the
build criteria for the crts to avoid newer ld64 versions warnings about
mismatches in build and object versions.

Added to some of the comments that it's documented why the specs are as
they are.

2019-07-03  Iain Sandoe  <iain@sandoe.co.uk>

gcc/

	* config/darwin.h (REAL_LIBGCC_SPEC): Adjust for earlier Darwin.
	(STARTFILE_SPEC): Split crt3 into a separate spec.
	(DARWIN_EXTRA_SPECS): Add crt2 and crt3 spec.
	(DARWIN_CRT2_SPEC): New.
	(DARWIN_CRT3_SPEC): New.
	(MIN_LD64_OMIT_STUBS): Revise to 62.1.
	* config/rs6000/darwin.h (DARWIN_CRT2_SPEC): Revise conditions.
	(DARWIN_CRT3_SPEC): New.

libgcc/

2019-07-03  Iain Sandoe  <iain@sandoe.co.uk>

	* config.host (powerpc-*-darwin*,powerpc64-*-darwin*): Revise crt
	list.
	* config/rs6000/t-darwin: Build crt3_2 for older systems.  Revise
	mmacosx-version-min for crts to run across all system versions.
	* config/rs6000/t-darwin64 (LIB2ADD): Remove.
	* config/t-darwin: Revise mmacosx-version-min for crts to run across
	system versions >= 10.4.

From-SVN: r273016

5 files changed, 30 insertions, 24 deletions

diff --git a/libgcc/ChangeLog b/libgcc/ChangeLog
index d4cbee0..f9f900b 100644
--- a/libgcc/ChangeLog
+++ b/libgcc/ChangeLog
@@ -1,3 +1,13 @@
+2019-07-03  Iain Sandoe  <iain@sandoe.co.uk>
+
+	* config.host (powerpc-*-darwin*,powerpc64-*-darwin*): Revise crt
+	list.
+	* config/rs6000/t-darwin: Build crt3_2 for older systems.  Revise
+	mmacosx-version-min for crts to run across all system versions.
+	* config/rs6000/t-darwin64 (LIB2ADD): Remove.
+	* config/t-darwin: Revise mmacosx-version-min for crts to run across
+	system versions >= 10.4.
+
 2019-07-03  Martin Liska  <mliska@suse.cz>
 
 	* Makefile.in: Use topn_values instead of one_value names.
diff --git a/libgcc/config.host b/libgcc/config.host
index cf52b27..e11a065 100644
--- a/libgcc/config.host
+++ b/libgcc/config.host
@@ -1084,18 +1084,20 @@ powerpc-*-darwin*)
 	case ${host} in
 	*-*-darwin9* | *-*-darwin[12][0-9]*)
 	  # libSystem contains unwind information for signal frames since
-	  # Darwin 9.
+	  # Darwin 9.  We don't need longcall either.
 	  ;;
 	*)
+	  # prepend the fragment forcing darwin8 codegen.
+	  tmake_file="rs6000/t-darwin8 $tmake_file"
 	  md_unwind_header=rs6000/darwin-unwind.h
 	  ;;
 	esac
-	tmake_file="$tmake_file rs6000/t-ibm-ldouble"
-	extra_parts="$extra_parts crt2.o libef_ppc.a"
+	tmake_file="$tmake_file rs6000/t-ppc64-fp rs6000/t-ibm-ldouble"
+	extra_parts="$extra_parts crt2.o crt3_2.o libef_ppc.a dw_ppc.o"
 	;;
 powerpc64-*-darwin*)
 	tmake_file="$tmake_file rs6000/t-darwin64 rs6000/t-ibm-ldouble"
-	extra_parts="$extra_parts crt2.o libef_ppc.a"
+	extra_parts="$extra_parts crt2.o crt3_2.o libef_ppc.a dw_ppc.o"
 	;;
 powerpc*-*-freebsd*)
 	tmake_file="${tmake_file} rs6000/t-ppccomm rs6000/t-savresfgpr rs6000/t-crtstuff rs6000/t-freebsd t-softfp-sfdf t-softfp-excl t-softfp"
diff --git a/libgcc/config/rs6000/t-darwin b/libgcc/config/rs6000/t-darwin
index 0c238b7..8b513bd 100644
--- a/libgcc/config/rs6000/t-darwin
+++ b/libgcc/config/rs6000/t-darwin
@@ -1,7 +1,11 @@
-DARWIN_EXTRA_CRT_BUILD_CFLAGS = -mlongcall -mmacosx-version-min=10.4
 
 crt2.o: $(srcdir)/config/rs6000/darwin-crt2.c
-	$(crt_compile) $(DARWIN_EXTRA_CRT_BUILD_CFLAGS) -c $<
+	$(crt_compile) -mmacosx-version-min=10.1 -c $<
+
+# The sources for this indicate that there are some parts that
+# don't apply >= 10.4
+crt3_2.o: $(srcdir)/config/darwin-crt3.c
+	$(crt_compile) -mmacosx-version-min=10.1 -c $<
 
 # The outlined register save/restore functions need to run anywhere, and
 # they must be leaf functions suitable for use in an endfile.
@@ -32,10 +36,12 @@ libef_ppc.a: $(PPC_ENDFILE_OBJS)
 	$(AR_CREATE_FOR_TARGET) $@ $(PPC_ENDFILE_OBJS)
 	$(RANLIB_FOR_TARGET) $@
 
+dw_ppc.o: $(srcdir)/config/rs6000/darwin-world.S
+	$(crt_compile) -mmacosx-version-min=10.1 -c $<
+
 LIB2ADD = $(srcdir)/config/rs6000/darwin-tramp.S \
 	  $(srcdir)/config/darwin-64.c \
-	  $(srcdir)/config/rs6000/darwin-world.S \
-	  $(srcdir)/config/rs6000/ppc64-fp.c
+	  $(srcdir)/config/rs6000/darwin-world.S
 
 # The .S files above are designed to run on all processors, even though
 # they use AltiVec instructions.
diff --git a/libgcc/config/rs6000/t-darwin64 b/libgcc/config/rs6000/t-darwin64
index 50f09d6..999679f 100644
--- a/libgcc/config/rs6000/t-darwin64
+++ b/libgcc/config/rs6000/t-darwin64
@@ -1,7 +1 @@
 LIB2_SIDITI_CONV_FUNCS = yes
-
-LIB2ADD = $(srcdir)/config/rs6000/darwin-tramp.S \
-	  $(srcdir)/config/darwin-64.c \
-	  $(srcdir)/config/rs6000/darwin-fpsave.S \
-	  $(srcdir)/config/rs6000/darwin-gpsave.S \
-	  $(srcdir)/config/rs6000/darwin-world.S
diff --git a/libgcc/config/t-darwin b/libgcc/config/t-darwin
index 2fcb712..3b5e342 100644
--- a/libgcc/config/t-darwin
+++ b/libgcc/config/t-darwin
@@ -3,19 +3,13 @@
 HOST_LIBGCC2_CFLAGS += -mmacosx-version-min=10.4
 
 crt3.o: $(srcdir)/config/darwin-crt3.c
-	$(crt_compile) $(DARWIN_EXTRA_CRT_BUILD_CFLAGS) -c $<
+	$(crt_compile) -mmacosx-version-min=10.4 -c $<
 
 crttms.o: $(srcdir)/config/darwin-crt-tm.c
-	$(crt_compile) $(DARWIN_EXTRA_CRT_BUILD_CFLAGS) -DSTART -c $<
+	$(crt_compile) -mmacosx-version-min=10.4 -DSTART -c $<
 
 crttme.o: $(srcdir)/config/darwin-crt-tm.c
-	$(crt_compile) $(DARWIN_EXTRA_CRT_BUILD_CFLAGS) -DEND -c $<
-
-# -pipe because there's an assembler bug, 4077127, which causes
-# it to not properly process the first # directive, causing temporary
-# file names to appear in stabs, causing the bootstrap to fail.  Using -pipe
-# works around this by not having any temporary file names.
-HOST_LIBGCC2_CFLAGS += -pipe
+	$(crt_compile) -mmacosx-version-min=10.4 -DEND -c $<
 
 # Use unwind-dw2-fde-darwin
 LIB2ADDEH = $(srcdir)/unwind-dw2.c $(srcdir)/config/unwind-dw2-fde-darwin.c \
@@ -23,4 +17,4 @@ LIB2ADDEH = $(srcdir)/unwind-dw2.c $(srcdir)/config/unwind-dw2-fde-darwin.c \
 
 # Patch to __Unwind_Find_Enclosing_Function for Darwin10.
 d10-uwfef.o: $(srcdir)/config/darwin10-unwind-find-enc-func.c
-	$(crt_compile) $(DARWIN_EXTRA_CRT_BUILD_CFLAGS) -mmacosx-version-min=10.6 -c $<
+	$(crt_compile) -mmacosx-version-min=10.6 -c $<