[gcc r17-2686] gcn: mkoffload - pass -L<dir> on to the amdgcn-amdhsa linker

https://gcc.gnu.org/g:5fbbf2d12c6eac56d83930336ea7093de7c56bb5

commit r17-2686-g5fbbf2d12c6eac56d83930336ea7093de7c56bb5
Author: Tobias Burnus <[email protected]>
Date:   Fri Jul 24 14:27:03 2026 +0200

    gcn: mkoffload - pass -L<dir> on to the amdgcn-amdhsa linker
    
    Add a way to specify a linker-search path to the amdgcn-amdhsa/collect2
    linker call, which is in particular useful as '.' (current directory) is
    not in the search path.
    
    Note that the -L specified to the host compiler are not passed to mkoffload,
    i.e. only using a flag like --offload-options="-L." will affect the linker
    search path.
    
    gcc/ChangeLog:
    
            * config/gcn/mkoffload.cc (main): Pass -L<dir> on to the
            device compiler.

Diff:
---
 gcc/config/gcn/mkoffload.cc | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/gcc/config/gcn/mkoffload.cc b/gcc/config/gcn/mkoffload.cc
index 71e11f0f307b..65bd81b9ba42 100644
--- a/gcc/config/gcn/mkoffload.cc
+++ b/gcc/config/gcn/mkoffload.cc
@@ -1333,9 +1333,15 @@ main (int argc, char **argv)
 	obstack_ptr_grow (&ld_argv_obstack, "-save-temps");
 
       for (int i = 1; i < argc; i++)
-	if (startswith (argv[i], "-l")
-	    || startswith (argv[i], "-Wl")
-	    || startswith (argv[i], "-march"))
+	if (strcmp (argv[i], "-L") == 0 && i + 1 < argc)
+	  {
+	    obstack_ptr_grow (&ld_argv_obstack, argv[i]);
+	    obstack_ptr_grow (&ld_argv_obstack, argv[++i]);
+	  }
+	else if (startswith (argv[i], "-l")
+		 || startswith (argv[i], "-L")
+		 || startswith (argv[i], "-Wl")
+		 || startswith (argv[i], "-march"))
 	  obstack_ptr_grow (&ld_argv_obstack, argv[i]);
 
       obstack_ptr_grow (&cc_argv_obstack, "-dumpdir");