[patch #10500] gcc >=12 no longer supports -mpower10

[Tim Haines]

URL:
  <https://savannah.gnu.org/patch/?10500>

                 Summary: gcc >=12 no longer supports -mpower10
                   Group: GNU Autoconf Archive
               Submitter: thaines
               Submitted: Mon 03 Feb 2025 02:14:43 PM UTC
                Priority: 6
                  Status: None
             Assigned to: None
        Originator Email:
             Open/Closed: Open
         Discussion Lock: Any


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Follow-up Comments:


-------------------------------------------------------
Date: Mon 03 Feb 2025 02:14:43 PM UTC By: Tim Haines <thaines>
Support for -mpower10 was removed from gcc by
https://gcc.gnu.org/git/gitweb.cgi?p=gcc.git;h=4e577910050d in 2020.

My proposed fix is below, but I don't like it because

1) the clang check is redundant with the check below in AX_CHECK_COMPILE_FLAG

2) It doesn't check the version of gcc

Suggestions are very welcome.


diff --git a/m4/ax_gcc_archflag.m4 b/m4/ax_gcc_archflag.m4
index c52b9b2..fb3c2b5 100644
--- a/m4/ax_gcc_archflag.m4
+++ b/m4/ax_gcc_archflag.m4
@@ -240,7 +240,14 @@ if test "x[]m4_default([$1],yes)" = xyes; then # if we
require portable code
   # x86.  And some other arches (e.g. Alpha) don't accept -mtune.  Grrr.
   case $host_cpu in i*86|x86_64*|amd64*) flag_prefixes="$flag_prefixes -mcpu=
-m";; esac
 else
-  flag_prefixes="-march= -mcpu= -m"
+  if "x$ax_gcc_arch" = xpower10; then
+    if test "x$ax_cv_[]_AC_LANG_ABBREV[]_compiler_vendor" != xclang; then
+      # gcc 12.0 dropped support for -mpower10
+      flag_prefixes="-mcpu="
+    fi
+  else
+    flag_prefixes="-march= -mcpu= -m"
+  fi
 fi
 for flag_prefix in $flag_prefixes; do
   for arch in $ax_gcc_arch; do









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