From: Richard Sandiford <richard.sandiford@arm.com>
Date: Mon, 6 Jan 2020 13:01:48 +0000 (+0000)
Subject: [AArch64] Use move-if-change for aarch64-tune.md
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=033381118519f597dfb4f62614ffdec7f7b17390;p=gcc.git

[AArch64] Use move-if-change for aarch64-tune.md

If aarch64-tune.md was older than gentune.sh or aarch64-cores.def,
we'd try to overwrite it even if the current contents were correct.
This could cause problems with read-only source directories and
could cause spurious copying for rsync --archive.

2020-01-06  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	* config/aarch64/t-aarch64 ($(srcdir)/config/aarch64/aarch64-tune.md):
	Depend on...
	(s-aarch64-tune-md): ...this new stamp file.  Pipe the new contents
	to a temporary file and use move-if-change to update the real
	file where necessary.

From-SVN: r279900
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 520562a1fc8..820a86f353d 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,11 @@
+2020-01-06  Richard Sandiford  <richard.sandiford@arm.com>
+
+	* config/aarch64/t-aarch64 ($(srcdir)/config/aarch64/aarch64-tune.md):
+	Depend on...
+	(s-aarch64-tune-md): ...this new stamp file.  Pipe the new contents
+	to a temporary file and use move-if-change to update the real
+	file where necessary.
+
 2020-01-06  Richard Sandiford  <richard.sandiford@arm.com>
 
 	* config/aarch64/aarch64-sve.md (@aarch64_sel_dup<mode>): Use Upl
diff --git a/gcc/config/aarch64/t-aarch64 b/gcc/config/aarch64/t-aarch64
index ed250ea1369..475d5c5e8af 100644
--- a/gcc/config/aarch64/t-aarch64
+++ b/gcc/config/aarch64/t-aarch64
@@ -24,11 +24,15 @@ OPTIONS_H_EXTRA += $(srcdir)/config/aarch64/aarch64-cores.def \
 		   $(srcdir)/config/aarch64/aarch64-fusion-pairs.def \
 		   $(srcdir)/config/aarch64/aarch64-tuning-flags.def
 
-$(srcdir)/config/aarch64/aarch64-tune.md: $(srcdir)/config/aarch64/gentune.sh \
+$(srcdir)/config/aarch64/aarch64-tune.md: s-aarch64-tune-md; @true
+s-aarch64-tune-md: $(srcdir)/config/aarch64/gentune.sh \
 	$(srcdir)/config/aarch64/aarch64-cores.def
 	$(SHELL) $(srcdir)/config/aarch64/gentune.sh \
 		$(srcdir)/config/aarch64/aarch64-cores.def > \
+		tmp-aarch64-tune.md
+	$(SHELL) $(srcdir)/../move-if-change tmp-aarch64-tune.md \
 		$(srcdir)/config/aarch64/aarch64-tune.md
+	$(STAMP) s-aarch64-tune-md
 
 aarch64-builtins.o: $(srcdir)/config/aarch64/aarch64-builtins.c $(CONFIG_H) \
   $(SYSTEM_H) coretypes.h $(TM_H) \