Add macro GPGRT_INLINE and avoid -Wundef warnings

* src/gpg-error.h.in (GPG_ERR_INLINE): Use #if defined for possible
undefined macros to avoid warnign with GCC's -Wundef option.
(GPGRT_INLINE): New.
--

I still consider using -Wundef for regular building a bad behaviour
because undefined macros have a well defined value in a cpp
conditional.  That warning is useful for debugging build problems but
should not be used as standard warning option.  Anyway, here is a fix.

1 files changed, 28 insertions, 27 deletions

diff --git a/src/gpg-error.h.in b/src/gpg-error.h.in
index e85fbe5..0bdb567 100644
--- a/src/gpg-error.h.in
+++ b/src/gpg-error.h.in
@@ -1,25 +1,24 @@
 /* gpg-error.h - Public interface to libgpg-error.               -*- c -*-
-   Copyright (C) 2003, 2004, 2010, 2013, 2014, 2015 g10 Code GmbH
-
-   This file is part of libgpg-error.
-
-   libgpg-error is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public License
-   as published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   libgpg-error is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, see <http://www.gnu.org/licenses/>.
-
-   @configure_input@
+ * Copyright (C) 2003, 2004, 2010, 2013, 2014, 2015 g10 Code GmbH
+ *
+ * This file is part of libgpg-error.
+ *
+ * libgpg-error is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * libgpg-error is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <http://www.gnu.org/licenses/>.
+ *
+ * @configure_input@
  */
 
-
 #ifndef GPG_ERROR_H
 #define GPG_ERROR_H	1
 
@@ -28,15 +27,15 @@
 #include <stdarg.h>
 
 #ifdef __GNUC__
-#define GPG_ERR_INLINE __inline__
-#elif _MSC_VER >= 1300
-#define GPG_ERR_INLINE __inline
-#elif __STDC_VERSION__ >= 199901L
-#define GPG_ERR_INLINE inline
+# define GPG_ERR_INLINE __inline__
+#elif defined(_MSC_VER) && _MSC_VER >= 1300
+# define GPG_ERR_INLINE __inline
+#elif defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
+# define GPG_ERR_INLINE inline
 #else
-#ifndef GPG_ERR_INLINE
-#define GPG_ERR_INLINE
-#endif
+# ifndef GPG_ERR_INLINE
+#  define GPG_ERR_INLINE
+# endif
 #endif
 
 #ifdef __cplusplus
@@ -239,6 +238,8 @@ typedef unsigned int gpg_error_t;
 #endif
 
 
+/* The new name for the inline macro.  */
+#define GPGRT_INLINE GPG_ERR_INLINE
 
 
 /* Initialization function.  */