[PATCH 4/n] modula-2, driver: Handle static-libstd++ for targets without static/dynamic

[Iain Sandoe <iains.gcc@gmail.com>]

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 general handling of Bstatic/dynamic and the possible use of static
libgm2 libraries is unimplemented in this driver so far.  It seems likely
that the driver construction could be greatly simplified if the modula-2
runtimes were combined into fewer (hopefully, one) libraries.

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.
---
 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_:
-- 
2.37.1 (Apple Git-137.1)