m2, build: Use LDLFAGS for mklink

When trying to bootstrap current trunk on macOS 14.0 beta 3 with Xcode
15 beta 4, the build failed running mklink in stage 2:

unset CC ; m2/boot-bin/mklink -s --langc++ --exit --name m2/mc-boot/main.cc
/vol/gcc/src/hg/master/darwin/gcc/m2/init/mcinit
dyld[55825]: Library not loaded: /vol/gcc/lib/libstdc++.6.dylib

While it's unclear to me why this only happens on macOS 14, the problem
is clear: unlike other C++ executables, mklink isn't linked with
-static-libstdc++ which is passed in from toplevel in LDFLAGS.

This patch fixes that and allows the build to continue.

Bootstrapped on x86_64-apple-darwin23.0.0, i386-pc-solaris2.11, and
sparc-sun-solaris2.11.

2023-07-11  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	gcc/m2:
	* Make-lang.in (m2/boot-bin/mklink$(exeext)): Add $(LDFLAGS).

diff --git a/gcc/m2/Make-lang.in b/gcc/m2/Make-lang.in
index 6fb551f9a6016413de9e3ab499dbd6fa8ceea98d..0fe671e540d8f6dec81983e7a1b085ad90ae85f2 100644 (file)
--- a/gcc/m2/Make-lang.in
+++ b/gcc/m2/Make-lang.in
@@ -1653,7 +1653,7 @@ m2/gm2-compiler-boot/gm2.a: m2/boot-bin/mc$(exeext)
 
 m2/boot-bin/mklink$(exeext): $(srcdir)/m2/tools-src/mklink.c
        -test -d $(@D) || $(mkinstalldirs) $(@D)
-       $(CXX) $(CFLAGS) -I$(srcdir)/m2 -Im2/gm2-libs-boot -Im2/gm2-compiler-boot -I$(srcdir)/m2/mc-boot-ch $(INCLUDES) $< -o $@
+       $(CXX) $(CFLAGS) $(LDFLAGS) -I$(srcdir)/m2 -Im2/gm2-libs-boot -Im2/gm2-compiler-boot -I$(srcdir)/m2/mc-boot-ch $(INCLUDES) $< -o $@
 
 m2/gm2-compiler-boot/$(SRC_PREFIX)%.h: $(srcdir)/m2/gm2-compiler-boot/%.def $(MCDEPS)
        -test -d $(@D) || $(mkinstalldirs) $(@D)