qpid/cpp: relax the requirement for libcppunit

[Jim Meyering <ji...@meyering.net>]

I tested this by uninstalling cppunit and rerunning

  ./bootstrap && ./configure...

Build still works.
But "make check" fails (as expected) due to missing headers.

Regarding the new file, cppunit.m4, from cppunit-1.12, I presume
that like nearly all .m4 files, it is covered by the minimal-restrictions
copying/redistrib copyright clause.  It contains no copyright info.
FYI, if we do not include this file, the configure.ac changes will
still work as long as you bootstrap on a system where cppunit is
installed -- in that case, aclocal copies the .m4 file contents into
the ./aclocal.m4 file it creates.  Typically, the generated aclocal.m4
file is then included in a distribution tarball.

2006-12-06  Jim Meyering  <me...@redhat.com>

	Still test for libcppunit, but don't make configure fail if it's
	not available or too old.
	* configure.ac: Don't use PKG_CHECK_MODULES to test for cppunit,
	since this isn't a hard test (needed only for the tests run by
	"make check"), and doesn't really depend on the version.
	Instead, use the AM_PATH_CPPUNIT macro.
	* m4/cppunit.m4: New file, from cppunit-1.12.

Index: configure.ac
===================================================================
--- configure.ac	(revision 483109)
+++ configure.ac	(working copy)
@@ -93,9 +93,11 @@

 gl_CLOCK_TIME

+# Check for cppunit support.
 CPPUNIT_MINIMUM_VERSION=1.10.2
-PKG_CHECK_MODULES([CPPUNIT], [cppunit >= $CPPUNIT_MINIMUM_VERSION])
+AM_PATH_CPPUNIT([$CPPUNIT_MINIMUM_VERSION], , [CPPUNIT_LIBS=-lcppunit])
 CPPUNIT_CXXFLAGS=$CPPUNIT_CFLAGS
+AC_SUBST(CPPUNIT_LIBS)
 AC_SUBST(CPPUNIT_CXXFLAGS)

 AC_ARG_ENABLE(apr,
Index: m4/cppunit.m4
===================================================================
--- m4/cppunit.m4	(revision 0)
+++ m4/cppunit.m4	(revision 0)
@@ -0,0 +1,89 @@
+dnl
+dnl AM_PATH_CPPUNIT(MINIMUM-VERSION, [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]])
+dnl
+AC_DEFUN([AM_PATH_CPPUNIT],
+[
+
+AC_ARG_WITH(cppunit-prefix,[  --with-cppunit-prefix=PFX   Prefix where CppUnit is installed (optional)],
+            cppunit_config_prefix="$withval", cppunit_config_prefix="")
+AC_ARG_WITH(cppunit-exec-prefix,[  --with-cppunit-exec-prefix=PFX  Exec prefix where CppUnit is installed (optional)],
+            cppunit_config_exec_prefix="$withval", cppunit_config_exec_prefix="")
+
+  if test x$cppunit_config_exec_prefix != x ; then
+     cppunit_config_args="$cppunit_config_args --exec-prefix=$cppunit_config_exec_prefix"
+     if test x${CPPUNIT_CONFIG+set} != xset ; then
+        CPPUNIT_CONFIG=$cppunit_config_exec_prefix/bin/cppunit-config
+     fi
+  fi
+  if test x$cppunit_config_prefix != x ; then
+     cppunit_config_args="$cppunit_config_args --prefix=$cppunit_config_prefix"
+     if test x${CPPUNIT_CONFIG+set} != xset ; then
+        CPPUNIT_CONFIG=$cppunit_config_prefix/bin/cppunit-config
+     fi
+  fi
+
+  AC_PATH_PROG(CPPUNIT_CONFIG, cppunit-config, no)
+  cppunit_version_min=$1
+
+  AC_MSG_CHECKING(for Cppunit - version >= $cppunit_version_min)
+  no_cppunit=""
+  if test "$CPPUNIT_CONFIG" = "no" ; then
+    AC_MSG_RESULT(no)
+    no_cppunit=yes
+  else
+    CPPUNIT_CFLAGS=`$CPPUNIT_CONFIG --cflags`
+    CPPUNIT_LIBS=`$CPPUNIT_CONFIG --libs`
+    cppunit_version=`$CPPUNIT_CONFIG --version`
+
+    cppunit_major_version=`echo $cppunit_version | \
+           sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\1/'`
+    cppunit_minor_version=`echo $cppunit_version | \
+           sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\2/'`
+    cppunit_micro_version=`echo $cppunit_version | \
+           sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\3/'`
+
+    cppunit_major_min=`echo $cppunit_version_min | \
+           sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\1/'`
+    if test "x${cppunit_major_min}" = "x" ; then
+       cppunit_major_min=0
+    fi
+
+    cppunit_minor_min=`echo $cppunit_version_min | \
+           sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\2/'`
+    if test "x${cppunit_minor_min}" = "x" ; then
+       cppunit_minor_min=0
+    fi
+
+    cppunit_micro_min=`echo $cppunit_version_min | \
+           sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\3/'`
+    if test "x${cppunit_micro_min}" = "x" ; then
+       cppunit_micro_min=0
+    fi
+
+    cppunit_version_proper=`expr \
+        $cppunit_major_version \> $cppunit_major_min \| \
+        $cppunit_major_version \= $cppunit_major_min \& \
+        $cppunit_minor_version \> $cppunit_minor_min \| \
+        $cppunit_major_version \= $cppunit_major_min \& \
+        $cppunit_minor_version \= $cppunit_minor_min \& \
+        $cppunit_micro_version \>= $cppunit_micro_min `
+
+    if test "$cppunit_version_proper" = "1" ; then
+      AC_MSG_RESULT([$cppunit_major_version.$cppunit_minor_version.$cppunit_micro_version])
+    else
+      AC_MSG_RESULT(no)
+      no_cppunit=yes
+    fi
+  fi
+
+  if test "x$no_cppunit" = x ; then
+     ifelse([$2], , :, [$2])
+  else
+     CPPUNIT_CFLAGS=""
+     CPPUNIT_LIBS=""
+     ifelse([$3], , :, [$3])
+  fi
+
+  AC_SUBST(CPPUNIT_CFLAGS)
+  AC_SUBST(CPPUNIT_LIBS)
+])