Add libraw1394 autoconf macro (not yet complete).

Add functions and symbols to let macro determine version.


git-svn-id: svn://svn.linux1394.org/libraw1394/trunk@53 53a565d1-3bb7-0310-b661-cf11e63c67ab

configure.in

@@ -1,7 +1,7 @@
 # process this file with autoconf to get a configure script
 
 AC_INIT(Makefile.am)
-AM_INIT_AUTOMAKE(libraw1394, 0.9pre)
+AM_INIT_AUTOMAKE(libraw1394, 0.8.99)
 AM_CONFIG_HEADER(config.h)
 
 AC_PROG_CC

libraw1394.m4

@@ -0,0 +1,153 @@
+dnl
+dnl AC_LIB_RAW1394_FLAGS
+dnl This just unconditionally sets the options.  It should offer an option for
+dnl explicitly giving the path to libraw1394 on the configure command line.
+dnl
+AC_DEFUN(AC_LIB_RAW1394_FLAGS, [
+LIBRAW1394_CPPFLAGS=""
+LIBRAW1394_CFLAGS=""
+LIBRAW1394_LIBS="-lraw1394"
+
+AC_SUBST(LIBRAW1394_CPPFLAGS)
+AC_SUBST(LIBRAW1394_CFLAGS)
+AC_SUBST(LIBRAW1394_LIBS)
+])
+
+dnl
+dnl AC_LIB_RAW1394_HEADERS([ACTION_IF_FOUND[,ACTION_IF_NOT_FOUND]])
+dnl
+AC_DEFUN(AC_LIB_RAW1394_HEADERS, [
+AC_REQUIRE(AC_LIB_RAW1394_FLAGS)
+
+ac_libraw1394_save_cppflags=$CPPFLAGS
+CPPFLAGS="$LIBRAW1394_CPPFLAGS $CPPFLAGS"
+
+ac_libraw1394_headers=no
+AC_CHECK_HEADER(libraw1394/raw1394.h, ac_libraw1394_headers=yes)
+
+CPPFLAGS=$ac_libraw1394_save_cppflags
+
+if test $ac_libraw1394_headers = yes ; then $1; else $2; fi
+])
+
+
+dnl
+dnl AC_LIB_RAW1394_LIBVERSION(MINIMUMVERSION[,ACTION_IF_FOUND[,ACTION_IF_NOT_FOUND]])
+dnl
+AC_DEFUN(AC_LIB_RAW1394_LIBVERSION, [
+AC_REQUIRE(AC_LIB_RAW1394_HEADERS)
+
+ac_libraw1394_save_cppflags=$CPPFLAGS
+ac_libraw1394_save_cflags=$CFLAGS
+ac_libraw1394_save_libs=$LIBS
+CPPFLAGS="$LIBRAW1394_CPPFLAGS $CPPFLAGS"
+CFLAGS="$LIBRAW1394_CFLAGS $CFLAGS"
+LIBS="$LIBRAW1394_LIBS $LIBS"
+
+ac_libraw1394_versiontest_success=no
+ac_libraw1394_ver_symbol=`echo __libraw1394_version_$0 | sed 's/\./_/g'`
+
+AC_TRY_LINK([], [{
+	extern char $ac_libraw1394_ver_symbol;
+	$ac_libraw1394_ver_symbol++;
+}], ac_libraw1394_versiontest_success=yes)
+
+CPPFLAGS=$ac_libraw1394_save_cppflags
+CFLAGS=$ac_libraw1394_save_cflags
+LIBS=$ac_libraw1394_save_libs
+
+if test $ac_libraw1394_versiontest_success = yes; then $1; else $2; fi
+])
+
+
+dnl
+dnl AC_LIB_RAW1394_RUNTEST(MINIMUMVERSION[,ACTION_IF_FOUND
+dnl                        [,ACTION_IF_NOT_FOUND[,ACTION_IF_CROSS_COMPILING]]])
+AC_DEFUN(AC_LIB_RAW1394_RUNTEST, [
+AC_REQUIRE(AC_LIB_RAW1394_HEADERS)
+
+ac_libraw1394_save_cppflags=$CPPFLAGS
+ac_libraw1394_save_cflags=$CFLAGS
+ac_libraw1394_save_libs=$LIBS
+CPPFLAGS="$LIBRAW1394_CPPFLAGS $CPPFLAGS"
+CFLAGS="$LIBRAW1394_CFLAGS $CFLAGS"
+LIBS="$LIBRAW1394_LIBS $LIBS"
+
+
+dnl This program compares two version strings and returns with code 0 if
+dnl req_ver <= lib_ver, returns 1 otherwise.
+dnl 
+dnl "1.23" < "1.23.1"   (missing fields assumed zero)
+dnl "1.23pre" <> "1.23" (undefined, do not use text as version)
+dnl "1.21" > "1.3"      (no implicit delimiters)
+AC_TRY_RUN([
+#include <stdlib.h>
+#include <libraw1394/raw1394.h>
+
+int main()
+{
+        char *req_ver, *lib_ver;
+        unsigned int req_i, lib_i;
+
+        req_ver = "$1";
+        lib_ver = raw1394_get_libversion();
+
+        while (1) {
+                req_i = strtoul(req_ver, &req_ver, 10);
+                lib_i = strtoul(lib_ver, &lib_ver, 10);
+
+                if (req_i > lib_i) exit(1);
+                if (req_i < lib_i) exit(0);
+
+                if (*req_ver != '.' || *lib_ver != '.') exit(0);
+
+                req_ver++;
+                lib_ver++;
+        }
+}
+], ac_libraw1394_run=yes, ac_libraw1394_run=no, ac_libraw1394_run=cross)
+
+
+CPPFLAGS=$ac_libraw1394_save_cppflags
+CFLAGS=$ac_libraw1394_save_cflags
+LIBS=$ac_libraw1394_save_libs
+
+if test $ac_libraw1394_run = yes; then
+	$2
+elif test $ac_libraw1394_run = no; then
+	$3
+else
+	ifelse([$4], ,
+               AC_MSG_ERROR([$0 called without directions for cross compiling]),
+               [$4])
+fi
+])
+
+dnl
+dnl AC_LIB_RAW1394(MINIMUMVERSION[,ACTION_IF_FOUND[,ACTION_IF_NOT_FOUND]])
+dnl
+dnl Versions before 0.9 can't be checked, so this will always fail if the
+dnl installed libraw1394 is older than 0.9 as if the library weren't found.
+dnl
+AC_DEFUN(AC_LIB_RAW1394, [
+
+AC_LIB_RAW1394_FLAGS
+AC_LIB_RAW1394_HEADERS(ac_libraw1394_found=yes, ac_libraw1394_found=no
+
+if test $ac_libraw1394_found = yes ; then
+
+AC_MSG_CHECKING(for libraw1394 version >= [$1])
+AC_LIB_RAW1394_RUNTEST([$1], , ac_libraw1394_found=no,
+                       AC_LIB_RAW1394_LIBVERSION([$1], , ac_libraw1394_found=no))
+
+if test $ac_libraw1394_found = yes ; then
+	AC_MSG_RESULT(yes)
+	$2
+else
+	AC_MSG_RESULT(no)
+	$3
+fi
+
+fi
+
+])

src/Makefile.am

@@ -12,6 +12,7 @@ libraw1394_la_SOURCES =   \
 	readwrite.c       \
 	iso.c             \
 	fcp.c             \
+	version.c         \
 	kernel-raw1394.h  \
 	raw1394_private.h
 

src/raw1394.h

@@ -193,6 +193,13 @@ int raw1394_stop_iso_rcv(raw1394handle_t handle, unsigned int channel);
 int raw1394_start_fcp_listen(raw1394handle_t handle);
 int raw1394_stop_fcp_listen(raw1394handle_t handle);
 
+
+/*
+ * Returns the version string.  Designed to be used by the autoconf macro to
+ * detect the libraw version, not really intended for general use.
+ */
+const char *raw1394_get_libversion(void);
+
 #ifdef __cplusplus
 }
 #endif

src/version.c

@@ -0,0 +1,21 @@
+/*
+ * libraw1394 - library for raw access to the 1394 bus with the Linux subsystem.
+ *
+ * Copyright (C) 1999,2000,2001 Andreas Bombe
+ *
+ * This library is licensed under the GNU Lesser General Public License (LGPL),
+ * version 2.1 or later. See the file COPYING.LIB in the distribution for
+ * details.
+ */
+
+#include <config.h>
+
+/* Variables to find version by linking (avoid need for test program) */
+
+char __libraw1394_version_0_8_99;
+
+/* This function is to be used by the autoconf macro to find the lib version */
+const char *raw1394_get_libversion()
+{
+        return VERSION;
+}