[gcc r11-11344] libphobos, testsuite: Add prune clauses for two Darwin cases.

[Iain D Sandoe <iains@gcc.gnu.org>]

https://gcc.gnu.org/g:4a0e4f68a39c19c27456c9925c9dc85a3617ebad

commit r11-11344-g4a0e4f68a39c19c27456c9925c9dc85a3617ebad
Author: Iain Sandoe <iain@sandoe.co.uk>
Date:   Fri Nov 19 15:48:53 2021 +0000

    libphobos, testsuite: Add prune clauses for two Darwin cases.
    
    Depending on the permutation of CPU, OS version and shared/non-
    shared library inclusion, we get can get two warnings from the
    external tools (ld64, dsymutil) which are not actually GCC issues
    but relate to the external tools.  These are alrrady pruned in
    the main testsuite, this adds them to the library.
    
    Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>
    
    libphobos/ChangeLog:
    
            * testsuite/lib/libphobos.exp: Prune warnings from external
            tool bugs.
    
    (cherry picked from commit 532fae74c3b1197023a765272892e12e123f0a56)

Diff:
---
 libphobos/testsuite/lib/libphobos.exp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/libphobos/testsuite/lib/libphobos.exp b/libphobos/testsuite/lib/libphobos.exp
index 3be2092b12e..2af430a0e45 100644
--- a/libphobos/testsuite/lib/libphobos.exp
+++ b/libphobos/testsuite/lib/libphobos.exp
@@ -90,6 +90,13 @@ proc libphobos-dg-test { prog do_what extra_tool_flags } {
 }
 
 proc libphobos-dg-prune { system text } {
+
+    # Ignore harmless warnings from Xcode.
+    regsub -all "(^|\n)\[^\n\]*ld: warning: could not create compact unwind for\[^\n\]*" $text "" text
+
+    # Ignore dsymutil warning (tool bug is actually linker)
+    regsub -all "(^|\n)\[^\n\]*could not find object file symbol for symbol\[^\n\]*" $text "" text
+
     return $text
 }