From: Michihiro NAKAJIMA <ggcueroad@gmail.com>
Date: Tue, 10 May 2011 14:53:42 +0000 (-0400)
Subject: Fix build failure through cmake on linux.
X-Git-Tag: v3.0.0a~393
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a0f5fe6e0a12e30132e85346defd7df359e3f459;p=thirdparty%2Flibarchive.git

Fix build failure through cmake on linux.
It needs some macro such as _GNU_SOURCE to use extension functions.

including previous changes of build/cmake/config.h.in.

SVN-Revision: 3293
---

diff --git a/CMakeLists.txt b/CMakeLists.txt
index f8731b977..96b0ccdb0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -286,6 +286,20 @@ LA_CHECK_INCLUDE_FILE("wctype.h" HAVE_WCTYPE_H)
 LA_CHECK_INCLUDE_FILE("windows.h" HAVE_WINDOWS_H)
 LA_CHECK_INCLUDE_FILE("winioctl.h" HAVE_WINIOCTL_H)
 
+#
+# Check whether use of __EXTENSIONS__ is safe.
+# We need some macro such as _GNU_SOURCE to use extension functions.
+#
+SET(_INCLUDE_FILES)
+FOREACH (it ${_HEADER})
+   SET(_INCLUDE_FILES "${_INCLUDE_FILES}#include <${it}>\n")
+ENDFOREACH (it)
+
+CHECK_C_SOURCE_COMPILES(
+  "#define __EXTENSIONS__ 1
+   ${_INCLUDE_FILES}
+   int main() { return 0;}"
+ SAFE_TO_DEFINE_EXTENSIONS)
 
 #
 # Find OpenSSL
diff --git a/build/cmake/config.h.in b/build/cmake/config.h.in
index f9055247d..c1a1a6258 100644
--- a/build/cmake/config.h.in
+++ b/build/cmake/config.h.in
@@ -982,6 +982,9 @@ typedef uint64_t uintmax_t;
 /* Define to 1 if you can safely include both <sys/time.h> and <time.h>. */
 #cmakedefine TIME_WITH_SYS_TIME 1
 
+/*
+ * Some platform requires a macro to use extension functions.
+ */
 #cmakedefine SAFE_TO_DEFINE_EXTENSIONS 1
 #ifdef SAFE_TO_DEFINE_EXTENSIONS
 /* Enable extensions on AIX 3, Interix.  */