[committed] Fix more problems with new linker warnings

[Jeff Law via Gcc-patches]

As I mentioned in the original thread, my change to pr94157_0 was an 
attempt to avoid these warnings by passing a magic flag to the linker.  
Of course we may not be using GNU ld.  Or we may be on a non-elf target 
where the flag I used doesn't exist.  Or we may even be on a ELF target 
where those bits weren't added to the linker (frv).  Furthermore, we 
need fixes to all the nested function tests as well.

So even though I initially resisted pruning the warning, that seems like 
the best course of action.  So this patch removes my recent change to 
pr94157_0 and instead uses our pruning facilities.

I'll be pushing this to the trunk and gcc-12 branch.

Jeffcommit af71f96631920f32ed9ec6c1c35d140dbe9992d1
Author: Jeff Law <jeffreya...@gmail.com>
Date:   Thu Apr 28 12:03:52 2022 -0400

    [committed] Fix more problems with new linker warnings
    
    gcc/testsuite
            * gcc.dg/lto/pr94157_0.c: Revert last change.
            * lib/prune.exp (prune_gcc_output): Prune new linker warning.

diff --git a/gcc/testsuite/gcc.dg/lto/pr94157_0.c 
b/gcc/testsuite/gcc.dg/lto/pr94157_0.c
index a76141b1809..a6e308b855b 100644
--- a/gcc/testsuite/gcc.dg/lto/pr94157_0.c
+++ b/gcc/testsuite/gcc.dg/lto/pr94157_0.c
@@ -1,6 +1,6 @@
 /* { dg-lto-do link } */
 /* { dg-require-effective-target gas } */
-/* { dg-lto-options { { -O0 -fipa-vrp -flto -Wa,--noexecstack 
-Wa,--noexecstack -Wa,--execstack  -Wa,--execstack -Wa,--execstack 
-Wa,--execstack -Wa,--execstack -Wa,--execstack -Wa,--execstack -Wa,--execstack 
-Wa,--execstack -Wa,--execstack -Wa,--execstack -Wa,--execstack -Wa,--execstack 
-Wa,--execstack -Wl,-z,execstack} } } */
+/* { dg-lto-options { { -O0 -fipa-vrp -flto -Wa,--noexecstack 
-Wa,--noexecstack -Wa,--execstack  -Wa,--execstack -Wa,--execstack 
-Wa,--execstack -Wa,--execstack -Wa,--execstack -Wa,--execstack -Wa,--execstack 
-Wa,--execstack -Wa,--execstack -Wa,--execstack -Wa,--execstack -Wa,--execstack 
-Wa,--execstack } } } */
 
 int main() {
 
diff --git a/gcc/testsuite/lib/prune.exp b/gcc/testsuite/lib/prune.exp
index 422498527aa..04c6a1dd7a1 100644
--- a/gcc/testsuite/lib/prune.exp
+++ b/gcc/testsuite/lib/prune.exp
@@ -82,6 +82,11 @@ proc prune_gcc_output { text } {
     regsub -all "(^|\n)\[^\n\]*file path prefix \[^\n\]* never used" $text "" 
text
     regsub -all "(^|\n)\[^\n\]*linker input file unused since linking not 
done" $text "" text
 
+    # Ideally the tests would indicate that executable stacks were needed
+    # to the linker.  But the option for that varies and may not even exist
+    # on some targets.  So we're stuck pruning the warning.
+    regsub -all "(^|\n)(\[^\n\]*: warning:\[^\n\]*requires executable 
stack\[^\n\]*\n?)+" $text "\\1" text
+
     # Ignore harmless warnings from Xcode 3.2.x.
     regsub -all "(^|\n)\[^\n\]*ld: warning: can't add line info to anonymous 
symbol\[^\n\]*" $text "" text
     regsub -all "(^|\n)\[^\n\]*warning: 
DWARFDebugInfoEntry::AppendDependants\[^\n\]*AT_\[^\n\]*FORM_ref4\[^\n\]*" 
$text "" text