Hi,
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.
Regards
Robin
--
gcc/ChangeLog:
2018-06-04 Robin Dapp <rd...@linux.vnet.ibm.com>
* config/s390/s390.h (enum processor_flags): Do not use
default tune parameter when -march was specified.
diff --git a/gcc/config/s390/s390.h b/gcc/config/s390/s390.h
index a372981ff3a..ed0dfa19bb6 100644
--- a/gcc/config/s390/s390.h
+++ b/gcc/config/s390/s390.h
@@ -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);
