Prompted by the discussions around a recent clang bug, I realized that
gcc still defaults to -mcpu=v9 on Solaris/SPARC.
This is an oversight since the Oracle Studio 12.6 cc, released in 2017,
already defaults to -xarch=sparcvis2, the equivalent of
-mcpu=ultrasparc3. Besides, both the 32 and 64-bit libc.so.1 require
UltraSPARC III extensions anyway:
SPARC32PLUS Version 1, V8+ Required, UltraSPARC3 Extensions Required [VIS]
SPARCV9 Version 1, UltraSPARC3 Extensions Required [VIS]
So this patch follows suite.
Bootstrapped on sparc-sun-solaris2.11 and sparcv9-sun-solaris2.11 with
as/ld, gas/ld, and gas/gld configurations.
There are currently two regressions exposed by this patch (PRs 121191
and 121192), which are only present in gcc 16 resp. 15/16.
There's one small caveat: while Solaris now marks all objects with
EF_SPARC_32PLUS EF_SPARC_SUN_US1 EF_SPARC_SUN_US3, gas only sets the
EF_SPARC_SUN_US[13] flags in the ELF header if UltraSPARC I/III insns
are actually used. This is in accordance with the SPARC Compliance
Definition 2.4.1, 4P-1. In the end, it doesn't matter anyway since
libc.so.1 already has both flags, so the resulting executables and
shared objects will too, anyway.
I mean to commit this in the next couple of days unless Eric has
concerns or objections.
Rainer
--
-----------------------------------------------------------------------------
Rainer Orth, Center for Biotechnology, Bielefeld University
2025-07-20 Rainer Orth <r...@cebitec.uni-bielefeld.de>
gcc:
* config.gcc <sparc*-*-solaris2*> (with_cpu): Default to ultrasparc3.
# HG changeset patch
# Parent f6a8dc502ee4e0bcb203e9205d61006b4bd02a37
Default to -mcpu=ultrasparc3 on Solaris/SPARC
diff --git a/gcc/config.gcc b/gcc/config.gcc
--- a/gcc/config.gcc
+++ b/gcc/config.gcc
@@ -3505,10 +3505,9 @@ sparc*-*-solaris2*)
sparc64-*-* | sparcv9-*-*)
tm_file="sparc/default64.h ${tm_file}"
;;
- *)
- test x$with_cpu != x || with_cpu=v9
- ;;
esac
+ # Match Studio 12.6 cc.
+ with_cpu=${with_cpu:-ultrasparc3}
tmake_file="${tmake_file} sparc/t-sparc sparc/t-sol2"
;;
sparc-wrs-vxworks)
