Build: Only define HAVE_PROGRAM_INVOCATION_NAME if it is set to 1.

HAVE_DECL_PROGRAM_INVOCATION_NAME is renamed to
HAVE_PROGRAM_INVOCATION_NAME. Previously,
HAVE_DECL_PROGRAM_INVOCATION_NAME was always set when
building with autotools. CMake would only set this when it was 1, and the
dos/config.h did not define it. The new macro definition is consistent
across build systems.

cmake/tuklib_progname.cmake

@@ -13,7 +13,6 @@ include(CheckSymbolExists)
 function(tuklib_progname TARGET_OR_ALL)
     # NOTE: This glibc extension requires _GNU_SOURCE.
     check_symbol_exists(program_invocation_name errno.h
-                        HAVE_DECL_PROGRAM_INVOCATION_NAME)
-    tuklib_add_definition_if("${TARGET_OR_ALL}"
-                             HAVE_DECL_PROGRAM_INVOCATION_NAME)
+                        HAVE_PROGRAM_INVOCATION_NAME)
+    tuklib_add_definition_if("${TARGET_OR_ALL}" HAVE_PROGRAM_INVOCATION_NAME)
 endfunction()

m4/tuklib_progname.m4

@@ -21,5 +21,8 @@
 
 AC_DEFUN_ONCE([TUKLIB_PROGNAME], [
 AC_REQUIRE([TUKLIB_COMMON])
-AC_CHECK_DECLS([program_invocation_name], [], [], [#include <errno.h>])
+AC_CHECK_DECL([program_invocation_name], [AC_DEFINE(
+	[HAVE_PROGRAM_INVOCATION_NAME], [1],
+	[Define to 1 if PROGRAM_INVOCATION_NAME is declared in <errno.h>])],
+	[], [#include <errno.h>])
 ])dnl

src/common/tuklib_progname.c

@@ -14,7 +14,7 @@
 #include <string.h>
 
 
-#if !HAVE_DECL_PROGRAM_INVOCATION_NAME
+#ifndef HAVE_PROGRAM_INVOCATION_NAME
 char *progname = NULL;
 #endif
 

src/common/tuklib_progname.h

@@ -18,7 +18,7 @@
 
 TUKLIB_DECLS_BEGIN
 
-#if HAVE_DECL_PROGRAM_INVOCATION_NAME
+#ifdef HAVE_PROGRAM_INVOCATION_NAME
 #	define progname program_invocation_name
 #else
 #	define progname TUKLIB_SYMBOL(tuklib_progname)