[gcc r16-3741] testsuite: Only scan for known file extensions in lto.exp

[Jakub Jelinek]

https://gcc.gnu.org/g:2bb8cd3609f5997b5a22925267b675808127311a

commit r16-3741-g2bb8cd3609f5997b5a22925267b675808127311a
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Wed Sep 10 12:39:11 2025 +0200

    testsuite: Only scan for known file extensions in lto.exp
    
    This is something that has bothered me for a few years but I've only found
    time for it now.
    The glob used for finding *_1.* etc. counterparts to the *_0.* tests is too
    broad, so if one has say next to *_1.c file also *_1.c~ or *_1.c.~1~
    or *_1.c.orig or *_1.c.bak etc. files, lto.exp will report a warning and the
    test will fail.
    So, e.g. in rpm build if some backported commit in patch form adds some
    gcc/testsuite/*.dg/lto/ test and one uses -b option to patch, if one doesn't
    remove the backup files, the test will fail.
    
    Looking through all the *.dg/lto/ directories, I only see c, C, ii, f, f90
    and d extensions used right now for the *_1.* files (and higher), while for
    the *_0.* files also m, mm and f03 extensions are used.
    
    So, the following patch only searches for those (plus for Fortran uses the
    extensions searched by the gfortran.dg/lto/ driver, i.e. \[fF\]{,90,95,03,08}
    , not just f, f90 and f03).
    
    Tested on x86_64-linux and verified I got exactly the same number of
    grep '^Executing.on.host.*_[1-9]\.' testsuite/*/*.log
    before/after this patch when doing make check RUNTESTFLAGS=lto.exp
    except for 2 new ones which were previously failed because I had backup
    files for 2 tests.
    
    2025-09-10  Jakub Jelinek  <jakub@redhat.com>
    
            * lib/lto.exp (lto-execute-1): Search for _1.* etc. files
            only with a list of known extensions.

Diff:
---
 gcc/testsuite/lib/lto.exp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/gcc/testsuite/lib/lto.exp b/gcc/testsuite/lib/lto.exp
index 81519b580e13..9231e8550afb 100644
--- a/gcc/testsuite/lib/lto.exp
+++ b/gcc/testsuite/lib/lto.exp
@@ -659,9 +659,9 @@ proc lto-execute-1 { src1 sid } {
     set i 1
     set done 0
     while { !$done } {
-	set names [glob -nocomplain -types f -- "${dir}/${base}_${i}.*"]
+	set names [glob -nocomplain -types f -- "${dir}/${base}_${i}.{c,C,ii,\[fF\]{,90,95,03,08},d,m,mm}"]
 	if { [llength ${names}] > 1 } {
-	    warning "lto-execute: more than one file matched ${dir}/${base}_${i}.*"
+	    warning "lto-execute: more than one file matched ${dir}/${base}_${i}.{c,C,ii,\[fF\]{,90,95,03,08},d,m,mm}"
 	}
 	if { [llength ${names}] == 1 } {
 	    lappend src_list [lindex ${names} 0]