[gcc r10-8959] libgomp testsuite: tell warning from error diagnostics, etc. [PR80219, PR85303]

[gcc r10-8959] libgomp testsuite: tell warning from error diagnostics, etc. [PR80219, PR85303]

[Thomas Schwinge]

https://gcc.gnu.org/g:591e878fc6dd08502429a8e480d8e7d966836ca9

commit r10-8959-g591e878fc6dd08502429a8e480d8e7d966836ca9
Author: Thomas Schwinge <thomas@codesourcery.com>
Date:   Thu Oct 29 10:29:19 2020 +0100

    libgomp testsuite: tell warning from error diagnostics, etc. [PR80219, PR85303]
    
    This changes makes 'dg-warning', 'dg-error', 'dg-bogus', 'dg-message' behave as
    expected, and also enables use of relative line numbers as well as 'dg-line'.
    
            libgomp/
            PR testsuite/80219
            PR testsuite/85303
            * testsuite/lib/libgomp.exp (libgomp_init): Set
            'gcc_warning_prefix', 'gcc_error_prefix'.
    
    (cherry picked from commit 528507fa0314c75d1105890e4781a475c8badd7c)

Diff:
---
 libgomp/testsuite/lib/libgomp.exp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/libgomp/testsuite/lib/libgomp.exp b/libgomp/testsuite/lib/libgomp.exp
index ee5f0e57b19..a52f83e47ad 100644
--- a/libgomp/testsuite/lib/libgomp.exp
+++ b/libgomp/testsuite/lib/libgomp.exp
@@ -243,6 +243,12 @@ proc libgomp_init { args } {
     if { $offload_additional_options != "" } {
 	lappend ALWAYS_CFLAGS "additional_flags=${offload_additional_options}"
     }
+
+    # Tell warning from error diagnostics.  This fits for C, C++, and Fortran.
+    global gcc_warning_prefix
+    set gcc_warning_prefix "\[Ww\]arning:"
+    global gcc_error_prefix
+    set gcc_error_prefix "(\[Ff\]atal )?\[Ee\]rror:"
 }
 
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