From 24d6250f98420fb68817641056bcddd38067b64d Mon Sep 17 00:00:00 2001
From: Ian Lance Taylor <ian@gcc.gnu.org>
Date: Thu, 27 Jan 2011 23:25:31 +0000
Subject: [PATCH] Don't force rebuild if mksysinfo.sh does not change
 sysinfo.go.

From-SVN: r169342
---
 libgo/Makefile.am  | 6 +++++-
 libgo/Makefile.in  | 6 +++++-
 libgo/mksysinfo.sh | 3 ---
 3 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/libgo/Makefile.am b/libgo/Makefile.am
index af67803034d..dd17fffc9ab 100644
--- a/libgo/Makefile.am
+++ b/libgo/Makefile.am
@@ -2464,8 +2464,12 @@ testing/script/check: $(CHECK_DEPS)
 	$(CHECK)
 .PHONY: testing/script/check
 
-sysinfo.go: $(srcdir)/mksysinfo.sh config.h
+sysinfo.go: s-sysinfo; @true
+s-sysinfo: $(srcdir)/mksysinfo.sh config.h
 	CC="$(CC)" $(SHELL) $(srcdir)/mksysinfo.sh
+	$(SHELL) $(srcdir)/../move-if-change tmp-sysinfo.go sysinfo.go
+	$(STAMP) $@
+
 syscalls/libsyscall.a: $(go_syscall_files) $(go_syscall_c_files) sync.gox
 	rm -f syscall.gox syscalls/libsyscall.a
 	test -d syscalls || $(MKDIR_P) syscalls
diff --git a/libgo/Makefile.in b/libgo/Makefile.in
index af123adf7a9..238d0d3553b 100644
--- a/libgo/Makefile.in
+++ b/libgo/Makefile.in
@@ -4863,8 +4863,12 @@ testing/script/check: $(CHECK_DEPS)
 	$(CHECK)
 .PHONY: testing/script/check
 
-sysinfo.go: $(srcdir)/mksysinfo.sh config.h
+sysinfo.go: s-sysinfo; @true
+s-sysinfo: $(srcdir)/mksysinfo.sh config.h
 	CC="$(CC)" $(SHELL) $(srcdir)/mksysinfo.sh
+	$(SHELL) $(srcdir)/../move-if-change tmp-sysinfo.go sysinfo.go
+	$(STAMP) $@
+
 syscalls/libsyscall.a: $(go_syscall_files) $(go_syscall_c_files) sync.gox
 	rm -f syscall.gox syscalls/libsyscall.a
 	test -d syscalls || $(MKDIR_P) syscalls
diff --git a/libgo/mksysinfo.sh b/libgo/mksysinfo.sh
index 20eae7904c9..321b4324584 100755
--- a/libgo/mksysinfo.sh
+++ b/libgo/mksysinfo.sh
@@ -21,8 +21,6 @@ OUT=tmp-sysinfo.go
 
 set -e
 
-rm -f sysinfo.go
-
 rm -f sysinfo.c
 cat > sysinfo.c <<EOF
 #include "config.h"
@@ -388,5 +386,4 @@ echo $msghdr | \
       -e 's/msg_flags/Flags/' \
     >> ${OUT}
 
-mv -f ${OUT} sysinfo.go
 exit $?