Build system: introduce the BFD_LDFLAGS variable

This variable is not really used yet but will be used soon.

Makefile.config.in

@@ -168,6 +168,7 @@ PTHREAD_CAML_LINK=$(addprefix -cclib ,$(PTHREAD_LINK))
 UNIX_OR_WIN32=@unix_or_win32@
 UNIXLIB=@unixlib@
 BFD_CPPFLAGS=@bfd_cppflags@
+BFD_LDFLAGS=@bfd_ldflags@
 BFD_LDLIBS=@bfd_ldlibs@
 INSTALL_SOURCE_ARTIFACTS=@install_source_artifacts@
 

configure

@@ -720,6 +720,7 @@ asm_cfi_supported
 AS
 ASPP
 bfd_ldlibs
+bfd_ldflags
 bfd_cppflags
 x_libraries
 x_includes
@@ -2817,6 +2818,7 @@ VERSION=4.10.0+dev0-2019-04-23
 
 
 
+
 
 
 ## Generated files

configure.ac

@@ -132,6 +132,7 @@ AC_SUBST([pthread_link])
 AC_SUBST([x_includes])
 AC_SUBST([x_libraries])
 AC_SUBST([bfd_cppflags])
+AC_SUBST([bfd_ldflags])
 AC_SUBST([bfd_ldlibs])
 AC_SUBST([ASPP])
 AC_SUBST([AS])

tools/Makefile

@@ -268,7 +268,7 @@ DEF_SYMBOL_PREFIX = '-Dsymbol_prefix=""'
 endif
 
 objinfo_helper$(EXE): objinfo_helper.$(O)
-	$(CC) $(OC_CFLAGS) $(OUTPUTEXE)$@ $< $(BFD_LDLIBS)
+	$(CC) $(BFD_LDFLAGS) $(OC_CFLAGS) $(OUTPUTEXE)$@ $< $(BFD_LDLIBS)
 
 objinfo_helper.$(O): $(ROOTDIR)/runtime/caml/s.h