[gcc/devel/ranger] arm: Use move-if-change for updating regenerated files [PR93548]

[Aldy Hernandez]

https://gcc.gnu.org/g:492c63e5b72c3497160e2c2e113fb91644b3570e

commit 492c63e5b72c3497160e2c2e113fb91644b3570e
Author: Richard Earnshaw <rearnsha@arm.com>
Date:   Mon Feb 3 17:40:55 2020 +0000

    arm: Use move-if-change for updating regenerated files [PR93548]
    
    The t-arm make fragment currently uses 'mv' to update some files that
    are automatically regenerated, but this causes problems on read-only
    filesystems if the date stamps are incorrect and the files have not
    really changed.  So use move-if-change instead.
    
            PR target/93548
            * config/arm/t-arm: ($(srcdir)/config/arm/arm-tune.md,
            $(srcdir)/config/arm/arm-tables.opt): Use move-if-change.

Diff:
---
 gcc/ChangeLog        | 6 ++++++
 gcc/config/arm/t-arm | 6 ++++--
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index fef79bb44d5..a8559046244 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2020-02-03  Richard Earnshaw  <rearnsha@arm.com>
+
+	PR target/93548
+	* config/arm/t-arm: ($(srcdir)/config/arm/arm-tune.md)
+	($(srcdir)/config/arm/arm-tables.opt): Use move-if-change.
+
 2020-02-03  Andrew Stubbs  <ams@codesourcery.com>
 
 	* config.gcc: Remove "carrizo" support.
diff --git a/gcc/config/arm/t-arm b/gcc/config/arm/t-arm
index e8483d45688..b883f796956 100644
--- a/gcc/config/arm/t-arm
+++ b/gcc/config/arm/t-arm
@@ -70,13 +70,15 @@ $(srcdir)/config/arm/arm-tune.md: $(srcdir)/config/arm/parsecpu.awk \
 	$(srcdir)/config/arm/arm-cpus.in
 	$(AWK) -f $(srcdir)/config/arm/parsecpu.awk -v cmd=md \
 		$(srcdir)/config/arm/arm-cpus.in > arm-tune.new
-	mv arm-tune.new $(srcdir)/config/arm/arm-tune.md
+	$(srcdir)/../move-if-change arm-tune.new \
+				    $(srcdir)/config/arm/arm-tune.md
 
 $(srcdir)/config/arm/arm-tables.opt: $(srcdir)/config/arm/parsecpu.awk \
   $(srcdir)/config/arm/arm-cpus.in
 	$(AWK) -f $(srcdir)/config/arm/parsecpu.awk -v cmd=opt \
 		$(srcdir)/config/arm/arm-cpus.in > arm-tables.new
-	mv arm-tables.new $(srcdir)/config/arm/arm-tables.opt
+	$(srcdir)/../move-if-change arm-tables.new \
+				    $(srcdir)/config/arm/arm-tables.opt
 
 arm-cpu.h: s-arm-cpu ; @true
 s-arm-cpu: $(srcdir)/config/arm/parsecpu.awk \