build: Always use EXTERN_UNLESS_MAIN_MODULE pattern.

* common/util.h (EXTERN_UNLESS_MAIN_MODULE): Add the definion only
here but now without the Norcroft-C.  Change all other places where it
gets defined.
* common/iobuf.h (iobuf_debug_mode): Declare unconditionally as
extern.
* common/iobuf.c (iobuf_debug_mode): Define it here.
* agent/gpg-agent.c (INCLUDED_BY_MAIN_MODULE): Define here and also in
all main modules of all other programs.

* g10/main.h: Put util.h before the local header files.
--

This change is required for use with gcc/ld's LTO feature which does
not allow common blocks.  Further gcc 10 will make -fno-common the
default and thus this chnage is always needed.  What a pitty.

Co-authored-by: Tomáš Mráz
GnuPG-bug-id: 4831
Signed-off-by: Werner Koch <[email protected]>
(cherry picked from commit 21d9bd8b87a9f793a106095e3838eb71825189d7)

- Applied respective chnages also to gpg-card and keyboxd.

Signed-off-by: Werner Koch <[email protected]>

1 files changed, 1 insertions, 8 deletions

diff --git a/common/iobuf.h b/common/iobuf.h
index 9c9650c61..a3d9bd547 100644
--- a/common/iobuf.h
+++ b/common/iobuf.h
@@ -249,14 +249,7 @@ struct iobuf_struct
   int subno;
 };
 
-#ifndef EXTERN_UNLESS_MAIN_MODULE
-#if defined (__riscos__) && !defined (INCLUDED_BY_MAIN_MODULE)
-#define EXTERN_UNLESS_MAIN_MODULE extern
-#else
-#define EXTERN_UNLESS_MAIN_MODULE
-#endif
-#endif
-EXTERN_UNLESS_MAIN_MODULE int iobuf_debug_mode;
+extern int iobuf_debug_mode;
 
 
 /* Change the default size for all IOBUFs to KILOBYTE.  This needs to