subversion: make perl/ruby/python bindings build.

Need to filter out CPPFLAGS that confuse swig, see Homebrew#23993.

Library/Formula/subversion.rb

@@ -43,7 +43,10 @@ class Subversion < Formula
   # If building bindings, allow non-system interpreters
   env :userpaths if build.include? 'perl' or build.include? 'ruby'
 
-  # Prevent '-arch ppc' from being pulled in from Perl's $Config{ccflags}
+  # 1. Prevent '-arch ppc' from being pulled in from Perl's $Config{ccflags}
+  # 2. Backport r1535610 to help fix #23993.
+  #    See http://subversion.tigris.org/issues/show_bug.cgi?id=4465
+  # 3. Fix #23993 by stripping flags swig can't handle from SWIG_CPPFLAGS
   def patches
     { :p0 => DATA }
   end
@@ -149,6 +152,11 @@ def install
     system "make tools"
     system "make install-tools"
 
+    # Swig don't understand "-isystem" flags added by Homebrew, so
+    # filter them out.
+    #inreplace buildpath/"build-outputs.mk", /SWIG_CPPFLAGS/,
+    #  "$(filter-out -F/% -isystem/%,$(SWIG_CPPFLAGS))"
+
     if build.with? 'python'
       system "make swig-py"
       system "make install-swig-py"
@@ -235,6 +243,9 @@ def caveats
 end
 
 __END__
+
+Patch 1
+
 --- subversion/bindings/swig/perl/native/Makefile.PL.in~ 2013-06-20 18:58:55.000000000 +0200
 +++ subversion/bindings/swig/perl/native/Makefile.PL.in	2013-06-20 19:00:49.000000000 +0200
 @@ -69,10 +69,15 @@
@@ -255,3 +266,99 @@ def caveats
                   " -I$swig_srcdir/perl/libsvn_swig_perl",
                   " -I$svnlib_srcdir/include",
 
+Patch 2
+
+$  svn log -v -r1535610 --diff http://svn.apache.org/repos/asf/subversion/trunk
+------------------------------------------------------------------------
+r1535610 | breser | 2013-10-24 20:22:50 -0600 (Thu, 24 Oct 2013) | 20 lines
+Changed paths:
+   M /subversion/trunk/Makefile.in
+   M /subversion/trunk/build.conf
+   M /subversion/trunk/configure.ac
+
+Filter out -no-cpp-precomp from flags passed to SWIG.
+
+This is necessary since APR for whatever reason leaks the fact that it uses
+-no-cpp-precomp on OS X into apr-1-config.  Unfortunately, a lot of versions
+of APR have this in the wild so we just have to deal with it.  If you use clang
+directly you don't see this because we already filter it out of CPPFLAGS.
+
+* Makefile.in
+  (SWIG_CPPFLAGS): New variable, deliberately pulling in EXTRA_CPPFLAGS and
+    not EXTRA_SIWG_CPPFLAGS because it would be harmful to split those
+    (e.g. users wanting to enable a feature that adds an API).
+
+* build.conf
+  (swig-python-opts, swig-perl-opts, swig-ruby-opts): Use SWIG_CPPFLAGS
+    instead of CPPFLAGS.
+
+* configure.acc
+  (SWIG_CPPFLAGS): Add the variable and copy it from the normal CPPFLAGS
+    while filtering out the -no-cpp-precomp.
+
+
+Index: Makefile.in
+===================================================================
+--- Makefile.in	(revision 1535609)
++++ Makefile.in	(revision 1535610)
+@@ -181,6 +181,7 @@
+ CPPFLAGS = @CPPFLAGS@ $(EXTRA_CPPFLAGS)
+ LDFLAGS = @LDFLAGS@ $(EXTRA_LDFLAGS)
+ SWIG_LDFLAGS = @SWIG_LDFLAGS@ $(EXTRA_SWIG_LDFLAGS)
++SWIG_CPPFLAGS = @SWIG_CPPFLAGS@ $(EXTRA_CPPFLAGS)
+
+ COMPILE = $(CC) $(CMODEFLAGS) $(CPPFLAGS) $(CMAINTAINERFLAGS) $(CFLAGS) $(INCLUDES)
+ COMPILE_NOWARN = $(CC) $(CMODEFLAGS) $(CPPFLAGS) $(CNOWARNFLAGS) $(CFLAGS) $(INCLUDES)
+Index: build.conf
+===================================================================
+--- build.conf	(revision 1535609)
++++ build.conf	(revision 1535610)
+@@ -88,9 +88,9 @@
+
+ bdb-test-scripts =
+
+-swig-python-opts = $(CPPFLAGS) -python -classic
+-swig-perl-opts = $(CPPFLAGS) -perl -nopm -noproxy
+-swig-ruby-opts = $(CPPFLAGS) -ruby
++swig-python-opts = $(SWIG_CPPFLAGS) -python -classic
++swig-perl-opts = $(SWIG_CPPFLAGS) -perl -nopm -noproxy
++swig-ruby-opts = $(SWIG_CPPFLAGS) -ruby
+ swig-languages = python perl ruby
+ swig-dirs = 
+         subversion/bindings/swig/python
+Index: configure.ac
+===================================================================
+--- configure.ac	(revision 1535609)
++++ configure.ac	(revision 1535610)
+@@ -1490,6 +1490,11 @@
+   SVN_STRIP_FLAG(CPPFLAGS, [-no-cpp-precomp ])
+ fi
+
++# Need to strip '-no-cpp-precomp' from CPPFLAGS for SWIG as well.
++SWIG_CPPFLAGS="$CPPFLAGS"
++SVN_STRIP_FLAG(SWIG_CPPFLAGS, [-no-cpp-precomp ])
++AC_SUBST([SWIG_CPPFLAGS])
++
+ dnl Since this is used only on Unix-y systems, define the path separator as '/'
+ AC_DEFINE_UNQUOTED(SVN_PATH_LOCAL_SEPARATOR, '/',
+         [Defined to be the path separator used on your local filesystem])
+
+------------------------------------------------------------------------
+
+Patch 3
+
+diff -u configure.ac configure.ac
+--- configure.ac	(working copy)
++++ configure.ac	(working copy)
+@@ -1446,6 +1446,10 @@
+ # Need to strip '-no-cpp-precomp' from CPPFLAGS for SWIG as well.
+ SWIG_CPPFLAGS="$CPPFLAGS"
+ SVN_STRIP_FLAG(SWIG_CPPFLAGS, [-no-cpp-precomp ])
++# Swig don't understand "-F" and "-isystem" flags added by Homebrew,
++# so filter them out.
++SVN_STRIP_FLAG(SWIG_CPPFLAGS, [-F\/[[^ ]]* ])
++SVN_STRIP_FLAG(SWIG_CPPFLAGS, [-isystem\/[[^ ]]* ])
+ AC_SUBST([SWIG_CPPFLAGS])
+
+ dnl Since this is used only on Unix-y systems, define the path separator as '/'
+