[Speex-dev] [PATCH] Use pkg-config (if available) to detect libogg. Fall back to old method if pkg-config fails.

[Erik de Castro Lopo]

Hi all,

Here is a patch to user pkg-config (if available) to detect libogg and 
fall back to old method if pkg-config fails.

Pkg-config has the advantage that it can do configured to do the right
thing when cross-compiling.

Erik
---
 m4/Makefile.am  |    4 ++
 m4/extra_pkg.m4 |   85 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 89 insertions(+), 0 deletions(-)
 create mode 100644 m4/Makefile.am
 create mode 100644 m4/extra_pkg.m4

diff --git a/m4/Makefile.am b/m4/Makefile.am
new file mode 100644
index 0000000..a87e1b8
--- /dev/null
+++ b/m4/Makefile.am
@@ -0,0 +1,4 @@
+## Process this file with automake to produce Makefile.in. -*-Makefile-*-
+
+EXTRA_DIST = extra_pkg.m4
+
diff --git a/m4/extra_pkg.m4 b/m4/extra_pkg.m4
new file mode 100644
index 0000000..a92d090
--- /dev/null
+++ b/m4/extra_pkg.m4
@@ -0,0 +1,85 @@
+# extra_pkg.m4 - Macros to locate and utilise pkg-config.   -*- Autoconf -*-
+# 
+# Copyright (c) 2004 Scott James Remnant <scott at netsplit.com>.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program 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
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+#
+# As a special exception to the GNU General Public License, if you
+# distribute this file as part of a program that contains a
+# configuration script generated by Autoconf, you may include it under
+# the same distribution terms that you use for the rest of that program.
+
+# --------------------------------------------------------------
+# PKG_CHECK_MOD_VERSION(VARIABLE-PREFIX, MODULES, [ACTION-IF-FOUND],
+# [ACTION-IF-NOT-FOUND])
+#
+# This is a very slight modification to the macro PKG_CHECK_MODULES that
+# is in the original pkg.m4 file. It prints the versions in the checking
+# message (erikd at mega-nerd.com).
+
+AC_DEFUN([PKG_CHECK_MOD_VERSION],
+[AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
+AC_ARG_VAR([$1][_CFLAGS], [C compiler flags for $1, overriding pkg-config])dnl
+AC_ARG_VAR([$1][_LIBS], [linker flags for $1, overriding pkg-config])dnl
+
+pkg_failed=no
+AC_MSG_CHECKING([for $2 ])
+
+_PKG_CONFIG([$1][_CFLAGS], [cflags], [$2])
+_PKG_CONFIG([$1][_LIBS], [libs], [$2])
+
+m4_define([_PKG_TEXT], [Alternatively, you may set the environment variables $1[]_CFLAGS
+and $1[]_LIBS to avoid the need to call pkg-config.
+See the pkg-config man page for more details.])
+
+if test $pkg_failed = yes; then
+        _PKG_SHORT_ERRORS_SUPPORTED
+        if test $_pkg_short_errors_supported = yes; then
+	        $1[]_PKG_ERRORS=`$PKG_CONFIG --short-errors --errors-to-stdout --print-errors "$2"`
+        else 
+	        $1[]_PKG_ERRORS=`$PKG_CONFIG --errors-to-stdout --print-errors "$2"`
+        fi
+	# Put the nasty error message in config.log where it belongs
+	echo "$$1[]_PKG_ERRORS" >&AS_MESSAGE_LOG_FD
+
+	ifelse([$4], , [AC_MSG_ERROR(dnl
+[Package requirements ($2) were not met:
+
+$$1_PKG_ERRORS
+
+Consider adjusting the PKG_CONFIG_PATH environment variable if you
+installed software in a non-standard prefix.
+
+_PKG_TEXT
+])],
+		[AC_MSG_RESULT([no])
+                $4])
+elif test $pkg_failed = untried; then
+	ifelse([$4], , [AC_MSG_FAILURE(dnl
+[The pkg-config script could not be found or is too old.  Make sure it
+is in your PATH or set the PKG_CONFIG environment variable to the full
+path to pkg-config.
+
+_PKG_TEXT
+
+To get pkg-config, see <http://pkg-config.freedesktop.org/>.])],
+		[$4])
+else
+	$1[]_CFLAGS=$pkg_cv_[]$1[]_CFLAGS
+	$1[]_LIBS=$pkg_cv_[]$1[]_LIBS
+        AC_MSG_RESULT([yes])
+	ifelse([$3], , :, [$3])
+fi[]dnl
+])# PKG_CHECK_MOD_VERSION
-- 
1.6.3.3