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S/390: Fix mtune default. 

When building with --with-tune=zEC12 and calling the resulting gcc
with --march=z13 (no extra -mtune), the binary would unexpectedly be compiled
with -march=z13 -mtune=zEC12.  This patch avoids using the default tune
parameter if -march is specified as argument but the user can still
explicitly state -march=z13 -mtune=zEC12.

gcc/ChangeLog:

2018-06-26  Robin Dapp  <rdapp@linux.vnet.ibm.com>

	* config/s390/s390.h (enum processor_flags): Do not use
	default tune parameter when -march was specified.

From-SVN: r262143
This commit is contained in:
Robin Dapp 2018-06-26 11:50:09 +00:00 committed by Robin Dapp
parent d37a91e5c5
commit 4723f0fb4e
2 changed files with 6 additions and 1 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2018-06-26 Robin Dapp <rdapp@linux.vnet.ibm.com>
* config/s390/s390.h (enum processor_flags): Do not use
default tune parameter when -march was specified.
2018-06-26 Jakub Jelinek <jakub@redhat.com>
PR target/86314

2
gcc/config/s390/s390.h
View File

@ -205,7 +205,7 @@ enum processor_flags
#define OPTION_DEFAULT_SPECS \
{ "mode", "%{!mesa:%{!mzarch:-m%(VALUE)}}" }, \
{ "arch", "%{!march=*:-march=%(VALUE)}" }, \
{ "tune", "%{!mtune=*:-mtune=%(VALUE)}" }
{ "tune", "%{!mtune=*:%{!march=*:-mtune=%(VALUE)}}" }
#ifdef __s390__
extern const char *s390_host_detect_local_cpu (int argc, const char **argv);