[gcc r15-9150] libstdc++, testsuite, Darwin: Prune a new linker warning present form XCode 16.

[Iain D Sandoe]

https://gcc.gnu.org/g:efe72d9f050a72ffb698adef8434afae1849dcff

commit r15-9150-gefe72d9f050a72ffb698adef8434afae1849dcff
Author: Iain Sandoe <iain@sandoe.co.uk>
Date:   Wed Apr 2 14:38:38 2025 +0100

    libstdc++, testsuite, Darwin: Prune a new linker warning present form XCode 16.
    
    Darwin's linker now warns when duplicate rpaths are presented - which
    happens when we emit duplicate '-B' paths.  In principle, we should avoid
    this in the test-suite, however at present we tend to have duplicates
    because different parts of the machinery add them.  At some point, it might
    be nice to have an "add_option_if_missing" and apply that across the whole
    of the test infra. However this is not something for late in stage 4.  So
    the solution here is to prune the warning - the effect of the duplicate in
    the libstdc++ testsuite is not important; it will make the exes very slightly
    larger but it won't alter the paths that are presented for loading the
    runtimes.
    
    libstdc++-v3/ChangeLog:
    
            * testsuite/lib/prune.exp: Prune ld warning about duplicatei
            rpaths.
    
    Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>

Diff:
---
 libstdc++-v3/testsuite/lib/prune.exp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libstdc++-v3/testsuite/lib/prune.exp b/libstdc++-v3/testsuite/lib/prune.exp
index 416e851614ba..a9a29937e43a 100644
--- a/libstdc++-v3/testsuite/lib/prune.exp
+++ b/libstdc++-v3/testsuite/lib/prune.exp
@@ -77,6 +77,9 @@ proc libstdc++-dg-prune { system text } {
     # Ignore harmless warnings from Xcode 4+.
     regsub -all "(^|\n)\[^\n\]*ld: warning: could not create compact unwind for\[^\n\]*" $text "" text
 
+    # Ignore duplicate path warnings from Xcode 16+.
+    regsub -all "(^|\n)\[^\n\]*ld: warning: duplicate -rpath\[^\n\]*" $text "" text
+
     # Ignore dsymutil warning (tool bug is actually in the linker)
     regsub -all "(^|\n)\[^\n\]*could not find object file symbol for symbol\[^\n\]*" $text "" text