[gcc r16-3281] Fix riscv build, no longer works with python2

[Richard Biener via Gcc-cvs]

https://gcc.gnu.org/g:fc8e2846c24bd62091b31cc35c143b990e79d557

commit r16-3281-gfc8e2846c24bd62091b31cc35c143b990e79d557
Author: Richard Biener <rguent...@suse.de>
Date:   Tue Aug 19 10:12:31 2025 +0200

    Fix riscv build, no longer works with python2
    
    Building riscv no longer works with python2:
    
    > python ./config/riscv/arch-canonicalize -misa-spec=20191213 rv64gc
      File "./config/riscv/arch-canonicalize", line 229
        print(f"ERROR: Unhandled conditional dependency: '{ext_name}' with 
condition:", file=sys.stderr)
                                                                                
     ^
    SyntaxError: invalid syntax
    
    On systems that have python aliased to python2 we chose that, even
    when python3 is available.  Don't.
    
            * config.gcc (riscv*-*-*): Look for python3, then fall back
            to python.  Never use python2.

Diff:
---
 gcc/config.gcc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gcc/config.gcc b/gcc/config.gcc
index 55e171816dca..56246387ef55 100644
--- a/gcc/config.gcc
+++ b/gcc/config.gcc
@@ -4782,7 +4782,7 @@ case "${target}" in
                        exit 1
                        ;;
                esac
-               PYTHON=`which python || which python3 || which python2`
+               PYTHON=`which python3 || which python`
                if test "x${PYTHON}" != x; then
                        with_arch=`${PYTHON} 
${srcdir}/config/riscv/arch-canonicalize -misa-spec=${with_isa_spec} 
${with_arch}`
                fi