configure.ac: Check for all known Python3 pkg-config names.

Even when using pkg-config not all distro/platform specific issues are
transparent, unfortunately. On some systems the pkg-config file is
named "python3.pc" on others it's versioned, e.g. "python-3.2.pc".

See also: http://sigrok.org/wiki/Libsigrokdecode/Python

This should fix the build on e.g. FreeBSD, NetBSD, Mac OS X (some
versions), and possibly various Linux distros, e.g. Gentoo.

Also, drop manual AC_MSG_ERROR() and let PKG_CHECK_MODULES() output a
more verbose and standardized error message if Python 3 is not found.

diff --git a/configure.ac b/configure.ac
index 2d480eed399696fb5e79d88420d1c9236ad34fbe..f7bf20d4c653b06b13387d8c1568b787b9724da3 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -88,12 +88,28 @@ build_runtc="yes"
 AM_PATH_GLIB_2_0([2.24.0],
         [CFLAGS="$CFLAGS $GLIB_CFLAGS"; LIBS="$LIBS $GLIB_LIBS"])
 
-# Python support. We require at least Python >= 3.0.
+# Python 3 is always needed.
+# Note: We need to try a few different variants, since some systems have a
+# python3.pc file, others have a python-3.3.pc file, and so on.
+# See also: http://sigrok.org/wiki/Libsigrokdecode/Python
 CPPFLAGS_PYTHON=""
 LDFLAGS_PYTHON=""
 PKG_CHECK_MODULES([python3], [python3 >= 3.0],
-       [have_python3="yes"; CPPFLAGS_PYTHON="$python3_CFLAGS";
-       LDFLAGS_PYTHON="$python3_LIBS"], [have_python3="no"])
+       [CPPFLAGS_PYTHON="$CPPFLAGS_PYTHON $python3_CFLAGS";
+       LDFLAGS_PYTHON="$LDFLAGS_PYTHON $python3_LIBS"],
+[PKG_CHECK_MODULES([python33], [python-3.3 >= 3.0],
+       [CPPFLAGS_PYTHON="$CPPFLAGS_PYTHON $python33_CFLAGS";
+       LDFLAGS_PYTHON="$LDFLAGS_PYTHON $python33_LIBS"],
+[PKG_CHECK_MODULES([python32], [python-3.2 >= 3.0],
+       [CPPFLAGS_PYTHON="$CPPFLAGS_PYTHON $python32_CFLAGS";
+       LDFLAGS_PYTHON="$LDFLAGS_PYTHON $python32_LIBS"],
+[PKG_CHECK_MODULES([python31], [python-3.1 >= 3.0],
+       [CPPFLAGS_PYTHON="$CPPFLAGS_PYTHON $python31_CFLAGS";
+       LDFLAGS_PYTHON="$LDFLAGS_PYTHON $python31_LIBS"],
+[PKG_CHECK_MODULES([python30], [python-3.0 >= 3.0],
+       [CPPFLAGS_PYTHON="$CPPFLAGS_PYTHON $python30_CFLAGS";
+       LDFLAGS_PYTHON="$LDFLAGS_PYTHON $python30_LIBS"],
+)])])])])
 case "$build" in
 *mingw*)
        # We currently hardcode the paths to the Python 3.2 default install
@@ -103,11 +119,6 @@ case "$build" in
        CPPFLAGS_PYTHON="-I/c/Python32/include -Ic:/Python32/include"
        LDFLAGS_PYTHON="-L/c/Python32/libs -Lc:/Python32/libs -lpython32"
        ;;
-*)
-       if test x"$have_python3" = xno; then
-               AC_MSG_ERROR([python3 not found])
-       fi
-       ;;
 esac
 AC_SUBST(CPPFLAGS_PYTHON)
 AC_SUBST(LDFLAGS_PYTHON)
@@ -121,7 +132,8 @@ PKG_CHECK_MODULES([check], [check >= 0.9.4],
        LIBS="$LIBS $check_LIBS"], [have_check="no"])
 AM_CONDITIONAL(HAVE_CHECK, test x"$have_check" = "xyes")
 
-# Protocol decoder test framework
+# libsigrok is optional (only used for the protocol decoder test framework).
+# Disable if not found.
 PKG_CHECK_MODULES([libsigrok], [libsigrok >= 0.2.0],
        [LIBSIGROK_CFLAGS="$libsigrok_CFLAGS"; LIBSIGROK_LIBS="$libsigrok_LIBS"],
        [build_runtc="no"])