configure.ac (plugin-version.h): Generate GCCPLUGIN_VERSION_MAJOR...

2011-07-06  Basile Starynkevitch  <basile@starynkevitch.net>

	* configure.ac (plugin-version.h): Generate
	GCCPLUGIN_VERSION_MAJOR, GCCPLUGIN_VERSION_MINOR,
	GCCPLUGIN_VERSION_PATCHLEVEL, GCCPLUGIN_VERSION constant integer
	macros.

	* configure: Regenerate.

	* doc/plugins.texi (Building GCC plugins): Mention
	GCCPLUGIN_VERSION ... constant macros in plugin-version.h.

From-SVN: r175923

gcc/ChangeLog

+2011-07-06  Basile Starynkevitch  <basile@starynkevitch.net>
+
+	* configure.ac (plugin-version.h): Generate
+	GCCPLUGIN_VERSION_MAJOR, GCCPLUGIN_VERSION_MINOR,
+	GCCPLUGIN_VERSION_PATCHLEVEL, GCCPLUGIN_VERSION constant integer
+	macros.
+
+	* configure: Regenerate.
+
+	* doc/plugins.texi (Building GCC plugins): Mention
+	GCCPLUGIN_VERSION ... constant macros in plugin-version.h.
+
 2011-07-06  Bernd Schmidt  <bernds@codesourcery.com>
 
 	* machmode.h (TRULY_NOOP_TRUNCATION_MODES_P): New macro.

gcc/configure

@@ -11072,6 +11072,11 @@ fi
 cat > plugin-version.h <<EOF
 #include "configargs.h"
 
+#define GCCPLUGIN_VERSION_MAJOR   `echo $gcc_BASEVER | sed -e 's/^\([0-9]*\).*$/\1/'`
+#define GCCPLUGIN_VERSION_MINOR   `echo $gcc_BASEVER | sed -e 's/^[0-9]*\.\([0-9]*\).*$/\1/'`
+#define GCCPLUGIN_VERSION_PATCHLEVEL   `echo $gcc_BASEVER | sed -e 's/^[0-9]*\.[0-9]*\.\([0-9]*\)$/\1/'`
+#define GCCPLUGIN_VERSION  (GCCPLUGIN_VERSION_MAJOR*1000 + GCCPLUGIN_VERSION_MINOR)
+
 static char basever[] = "$gcc_BASEVER";
 static char datestamp[] = "$gcc_DATESTAMP";
 static char devphase[] = "$gcc_DEVPHASE";
@@ -17623,7 +17628,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 17626 "configure"
+#line 17631 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -17729,7 +17734,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 17732 "configure"
+#line 17737 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H

gcc/configure.ac

@@ -1511,6 +1511,11 @@ fi
 cat > plugin-version.h <<EOF
 #include "configargs.h"
 
+#define GCCPLUGIN_VERSION_MAJOR   `echo $gcc_BASEVER | sed -e 's/^\([0-9]*\).*$/\1/'`
+#define GCCPLUGIN_VERSION_MINOR   `echo $gcc_BASEVER | sed -e 's/^[0-9]*\.\([0-9]*\).*$/\1/'`
+#define GCCPLUGIN_VERSION_PATCHLEVEL   `echo $gcc_BASEVER | sed -e 's/^[0-9]*\.[0-9]*\.\([0-9]*\)$/\1/'`
+#define GCCPLUGIN_VERSION  (GCCPLUGIN_VERSION_MAJOR*1000 + GCCPLUGIN_VERSION_MINOR)
+
 static char basever[] = "$gcc_BASEVER";
 static char datestamp[] = "$gcc_DATESTAMP";
 static char devphase[] = "$gcc_DEVPHASE";

gcc/doc/plugins.texi

@@ -417,6 +417,17 @@ invoking @command{gcc -print-file-name=plugin} (replace if needed
 Inside plugins, this @code{plugin} directory name can be queried by
 calling @code{default_plugin_dir_name ()}.
 
+Plugins may know, when they are compiled, the GCC version for which
+@file{plugin-version.h} is provided.  The constant macros
+@code{GCCPLUGIN_VERSION_MAJOR}, @code{GCCPLUGIN_VERSION_MINOR},
+@code{GCCPLUGIN_VERSION_PATCHLEVEL}, @code{GCCPLUGIN_VERSION} are
+integer numbers, so a plugin could ensure it is built for GCC 4.7 with 
+@smallexample
+#if GCCPLUGIN_VERSION != 4007
+#error this GCC plugin is for GCC 4.7
+#endif
+@end smallexample
+
 The following GNU Makefile excerpt shows how to build a simple plugin:
 
 @smallexample