[PATCH] Use EXEEXT and -no-undefined flag even on Unix.

[Michael Haubenwallner]

* src/Makefile.am: Always use the -no-undefined libtool flag.
Use EXEEXT with gen-posix-lock-obj in extra make target.

Cygwin is not identified as W32 system, but requires undefined symbols
to create a shared library.  As the shared library should not have
undefined symbols anywhere at all, we can use the -no-undefined libtool
flag unconditionally.
Although Cygwin tries to hide the .exe extension in general, automake
uses EXEEXT with PROGRAMS targets, which we have to match here.
---
 src/Makefile.am | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/src/Makefile.am b/src/Makefile.am
index 5623aff..2cf9dfb 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -118,7 +118,6 @@ SUFFIXES = .rc .lo
 	$(LTRCCOMPILE) -i "$<" -o "$@"
 
 gpg_error_res = versioninfo.lo
-no_undefined = -no-undefined
 export_symbols = -export-symbols gpg-error.def
 # i686-w64-mingw32.gcc version 4.9.1 takes the long long helper
 # functions from libgcc_s_sjlj-1.dll and not from a static libgcc.  As
@@ -147,7 +146,6 @@ else
 #
 arch_sources = posix-lock.c posix-lock-obj.h posix-thread.c
 gpg_error_res =
-no_undefined =
 export_symbols =
 extra_ltoptions =
 
@@ -168,7 +166,7 @@ else
 endif
 
 libgpg_error_la_LDFLAGS = \
-  $(no_undefined) $(export_symbols) $(libgpg_error_vers_opt) \
+  -no-undefined $(export_symbols) $(libgpg_error_vers_opt) \
   $(extra_ltoptions) -version-info \
   @LIBGPG_ERROR_LT_CURRENT@:@LIBGPG_ERROR_LT_REVISION@:@LIBGPG_ERROR_LT_AGE@
 
@@ -288,8 +286,8 @@ else
 pre_mkheader_cmds = :
 parts_of_gpg_error_h += ./lock-obj-pub.native.h
 
-./lock-obj-pub.native.h: Makefile gen-posix-lock-obj posix-lock-obj.h
-	./gen-posix-lock-obj >$@
+./lock-obj-pub.native.h: Makefile gen-posix-lock-obj$(EXEEXT) posix-lock-obj.h
+	./gen-posix-lock-obj$(EXEEXT) >$@
 endif
 
 # We also depend on versioninfo.rc because that is build by
-- 
2.7.3