[gcc r13-8576] libstdc++: Sync the atomic_link_flags implementation with GCC.

[Iain D Sandoe]

https://gcc.gnu.org/g:5975807ae77896e6e67656f38304149a643816b9

commit r13-8576-g5975807ae77896e6e67656f38304149a643816b9
Author: Iain Sandoe <iain@sandoe.co.uk>
Date:   Mon Mar 18 09:57:33 2024 +0000

    libstdc++: Sync the atomic_link_flags implementation with GCC.
    
    For Darwin, in order to allow uninstalled testing, we need to provide
    a '-B' option pointing to each path containing an uninstalled library
    that we are using (these get appended to the embedded runpaths).
    
    This updates the version of the atomic_link_flags proc in the libstdc++
    testsuite to do the same as the one in the GCC testsuite.
    
    libstdc++-v3/ChangeLog:
    
            * testsuite/lib/dg-options.exp (atomic_link_flags): Emit a -B
            option for the path to the uninstalled libatomic.
    
    Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>
    (cherry picked from commit 71a44faa8a4f76d68356c66c6054e6c242df820f)

Diff:
---
 libstdc++-v3/testsuite/lib/dg-options.exp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libstdc++-v3/testsuite/lib/dg-options.exp b/libstdc++-v3/testsuite/lib/dg-options.exp
index f7d5b05d6ed..427a251e789 100644
--- a/libstdc++-v3/testsuite/lib/dg-options.exp
+++ b/libstdc++-v3/testsuite/lib/dg-options.exp
@@ -314,7 +314,7 @@ proc atomic_link_flags { paths } {
       if { [file exists "${gccpath}/libatomic/.libs/libatomic.a"]
            || [file exists "${gccpath}/libatomic/.libs/libatomic.${shlib_ext}"] } {
           append flags " -B${gccpath}/libatomic/ "
-          append flags " -L${gccpath}/libatomic/.libs"
+          append flags " -B${gccpath}/libatomic/.libs"
           append ld_library_path ":${gccpath}/libatomic/.libs"
       }
     } else {