[gcc r13-5007] modula-2, driver: Handle static-libstd++ for targets without static/dynamic

[gcc r13-5007] modula-2, driver: Handle static-libstd++ for targets without static/dynamic

[Iain D Sandoe]

https://gcc.gnu.org/g:2421470867f198c3aa57e0a7ab0d473aac4cdd38

commit r13-5007-g2421470867f198c3aa57e0a7ab0d473aac4cdd38
Author: Iain Sandoe <iain@sandoe.co.uk>
Date:   Thu Dec 22 19:00:13 2022 +0000

    modula-2, driver: Handle static-libstd++ for targets without static/dynamic
    
    The follows the pattern used in C++ and D drivers to pass -static-libstdc++
    onto the target driver to allow spec substitution of static libraries.
    
    NOTE: The handling of Bstatic/dynamic and the possible use of static libgm2
    libraries is unimplemented in this driver so far.
    
    Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>
    
    gcc/m2/ChangeLog:
    
            * gm2spec.cc (lang_specific_driver): Pass -static-libstdc++ on to
            the target driver if the linker does not support Bstatic/dynamic.

Diff:
---
 gcc/m2/gm2spec.cc | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/gcc/m2/gm2spec.cc b/gcc/m2/gm2spec.cc
index 680dd3602ef..b9a5c4e79bb 100644
--- a/gcc/m2/gm2spec.cc
+++ b/gcc/m2/gm2spec.cc
@@ -767,7 +767,12 @@ lang_specific_driver (struct cl_decoded_option **in_decoded_options,
 
 	case OPT_static_libstdc__:
 	  library = library >= 0 ? 2 : library;
+#ifdef HAVE_LD_STATIC_DYNAMIC
+	  /* Remove -static-libstdc++ from the command only if target supports
+	     LD_STATIC_DYNAMIC.  When not supported, it is left in so that a
+	     back-end target can use outfile substitution.  */
 	  args[i] |= SKIPOPT;
+#endif
 	  break;
 
 	case OPT_stdlib_: