[PATCH] Add POST_LINK_SPEC for adding possibility of additional steps after linking

[Andris Pavenis]

Attached patch adds a possibility to add additional build steps after linking.
Without this patch only possibility is to redefine entire LINK_COMMAND_SPEC.
Currently only DJGPP seems to need it

2013-11-05    Andris Pavenis <andris.pave...@iki.fi>

        * gcc/gcc.c: Add macro POST_LINK SPEC for specifying additional steps
        to invoke after linking
        * gcc/doc/tm.texi.in: (POST_LINK_SPEC): new
        * gcc/doc/tm.texi: regenerate

Bootstrapped and tested on Linux x86_64 (Fedora 19)

Andris



>From 3dd27dc54f3fd38d2b1e9b7fb53938be4df8da7c Mon Sep 17 00:00:00 2001
From: Andris Pavenis <andris.pave...@iki.fi>
Date: Tue, 5 Nov 2013 11:52:17 +0200
Subject: [PATCH] POST_LINK_SPEC: new define for additional steps after linking

This allows to avoid redefining LINK_COMMAND_SPEC when
additional steps are needed after linking

An example: invoking stubify after linking for DJGPP
---
 gcc/doc/tm.texi    | 6 ++++++
 gcc/doc/tm.texi.in | 6 ++++++
 gcc/gcc.c          | 8 +++++++-
 3 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/gcc/doc/tm.texi b/gcc/doc/tm.texi
index 72daf09..692f675 100644
--- a/gcc/doc/tm.texi
+++ b/gcc/doc/tm.texi
@@ -402,6 +402,12 @@ the target makefile fragment or if none of the options listed in
 @xref{Target Fragment}.
 @end defmac
 
+@defmac POST_LINK_SPEC
+A C string constant giving complete commands needed to execute after linker.
+This macro allows to avoid redefining LINK_COMMAND_SPEC when additional
+steps are needed after invoking linker. The default value is empty string.
+@end defmac
+
 @defmac RELATIVE_PREFIX_NOT_LINKDIR
 Define this macro to tell @command{gcc} that it should only translate
 a @option{-B} prefix into a @option{-L} linker option if the prefix
diff --git a/gcc/doc/tm.texi.in b/gcc/doc/tm.texi.in
index 2828361..edc2b9d 100644
--- a/gcc/doc/tm.texi.in
+++ b/gcc/doc/tm.texi.in
@@ -400,6 +400,12 @@ the target makefile fragment or if none of the options listed in
 @xref{Target Fragment}.
 @end defmac
 
+@defmac POST_LINK_SPEC
+A C string constant giving complete commands needed to execute after linker.
+This macro allows to avoid redefining LINK_COMMAND_SPEC when additional
+steps are needed after invoking linker. The default value is empty string.
+@end defmac
+
 @defmac RELATIVE_PREFIX_NOT_LINKDIR
 Define this macro to tell @command{gcc} that it should only translate
 a @option{-B} prefix into a @option{-L} linker option if the prefix
diff --git a/gcc/gcc.c b/gcc/gcc.c
index 2298249..cc0ac29 100644
--- a/gcc/gcc.c
+++ b/gcc/gcc.c
@@ -745,6 +745,10 @@ proper position among the other output files.  */
     %{fvtable-verify=preinit: -lvtv -u_vtable_map_vars_start -u_vtable_map_vars_end}}"
 #endif
 
+#ifndef POST_LINK_SPEC
+#define POST_LINK_SPEC ""
+#endif
+
 /* -u* was put back because both BSD and SysV seem to support it.  */
 /* %{static:} simply prevents an error message if the target machine
    doesn't handle -static.  */
@@ -770,7 +774,7 @@ proper position among the other output files.  */
     %(mflib) " STACK_SPLIT_SPEC "\
     %{fprofile-arcs|fprofile-generate*|coverage:-lgcov} " SANITIZER_SPEC " \
     %{!nostdlib:%{!nodefaultlibs:%(link_ssp) %(link_gcc_c_sequence)}}\
-    %{!nostdlib:%{!nostartfiles:%E}} %{T*} }}}}}}"
+    %{!nostdlib:%{!nostartfiles:%E}} %{T*}  \n%(post_link) }}}}}}"
 #endif
 
 #ifndef LINK_LIBGCC_SPEC
@@ -812,6 +816,7 @@ static const char *linker_name_spec = LINKER_NAME;
 static const char *linker_plugin_file_spec = "";
 static const char *lto_wrapper_spec = "";
 static const char *lto_gcc_spec = "";
+static const char *post_link_spec = POST_LINK_SPEC;
 static const char *link_command_spec = LINK_COMMAND_SPEC;
 static const char *link_libgcc_spec = LINK_LIBGCC_SPEC;
 static const char *startfile_prefix_spec = STARTFILE_PREFIX_SPEC;
@@ -1304,6 +1309,7 @@ static struct spec_list static_specs[] =
   INIT_STATIC_SPEC ("linker_plugin_file",	&linker_plugin_file_spec),
   INIT_STATIC_SPEC ("lto_wrapper",		&lto_wrapper_spec),
   INIT_STATIC_SPEC ("lto_gcc",			&lto_gcc_spec),
+  INIT_STATIC_SPEC ("post_link",                &post_link_spec),
   INIT_STATIC_SPEC ("link_libgcc",		&link_libgcc_spec),
   INIT_STATIC_SPEC ("md_exec_prefix",		&md_exec_prefix),
   INIT_STATIC_SPEC ("md_startfile_prefix",	&md_startfile_prefix),
-- 
1.8.3.1