Forward port patches from python27 for dlopen(3)

Original changes in python27/Makefile r1.62-r1.67
=================================================

Add an option for Python: x11

Fix dlopen(3) calls in _ctypes.so for X11BASE libraries

A Python code can dynamically load shared libraries and it's wrapped with
a plain dlopen(3) call. The holder of this interface (_ctypes module)
without rpath set to X11BASE cannot detect libs like 'GL'.

Fixing find_library() on POSIX-like (excluding Darwin) systems.

This isn't addressing Python's wrapper for dlopen(3).

This possibily addresses mostly NetBSD as other popular OSes have ldconfig.

Testing commands:

 - before applying the patch

>>> from ctypes.util import find_library
>>> find_library("m")
'libm.so.0'
>>> find_library("crypto")
'libcrypto.so.11'
>>> find_library("GL")
>>> find_library("curl")

 - after applying the patch
>>> from ctypes.util import find_library
>>> find_library("m")
'libm.so.0'
>>> find_library("crypto")
'libcrypto.so.11'
>>> find_library("GL")
'libGL.so.2'
>>> find_library("curl")
'libcurl.so.4'

This patch doesn't solve the case of custom dirs like $PREFIX/qt5/lib.
However it's solving most common cases of using this call.

A possible solution is to parse the output "pkg_info -La"... however it's
very slow. In other words a cache with libraries might be needed to handle
it efficiently.

2 files changed, 50 insertions, 1 deletions

diff --git a/lang/python35/Makefile b/lang/python35/Makefile
index 2d5d0a0837e..95d3b506763 100644
--- a/lang/python35/Makefile
+++ b/lang/python35/Makefile
@@ -1,8 +1,9 @@
-# $NetBSD: Makefile,v 1.5 2016/07/02 15:07:47 adam Exp $
+# $NetBSD: Makefile,v 1.6 2016/09/18 12:44:49 kamil Exp $
 
 .include "dist.mk"
 
 PKGNAME=	python35-${PY_DISTVERSION}
+PKGREVISION=	1
 CATEGORIES=	lang python
 
 MAINTAINER=	pkgsrc-users@NetBSD.org
@@ -122,6 +123,26 @@ SUBST_STAGE.findlib=	pre-configure
 SUBST_FILES.findlib=	Lib/distutils/unixccompiler.py
 SUBST_SED.findlib=	-e 's,/usr/local,${PREFIX},'
 
+# XXX: It might be needed to add manually more paths like ${PREFIX}/qt5/lib
+# Testing:
+# >>> from ctypes.util import find_library
+# >>> find_library("m")
+# 'libm.so.0'
+# >>> find_library("crypto")
+# 'libcrypto.so.11'
+# >>> find_library("GL")
+# 'libGL.so.2'
+# >>> find_library("curl")
+# 'libcurl.so.4'
+
+SUBST_CLASSES+=		pfindlib
+SUBST_MESSAGE.pfindlib=	Fixing find_library() on POSIX-like (excluding Darwin) systems.
+SUBST_STAGE.pfindlib=	pre-configure
+SUBST_FILES.pfindlib=	Lib/ctypes/util.py
+SUBST_SED.pfindlib=	-e 's!\(-Wl,-t -o\)!${COMPILER_RPATH_FLAG}${PREFIX}/lib -L${PREFIX}/lib \1!'
+
+.include "options.mk"
+
 SUBST_CLASSES+=		sslbase
 SUBST_MESSAGE.sslbase=	Fixing OpenSSL base directory to find header file.
 SUBST_STAGE.sslbase=	pre-configure
diff --git a/lang/python35/options.mk b/lang/python35/options.mk
new file mode 100644
index 00000000000..1beb2fc695e
--- /dev/null
+++ b/lang/python35/options.mk
@@ -0,0 +1,28 @@
+# $NetBSD: options.mk,v 1.1 2016/09/18 12:44:49 kamil Exp $
+
+PKG_OPTIONS_VAR=	PKG_OPTIONS.python27
+PKG_SUPPORTED_OPTIONS+=	x11
+PKG_SUGGESTED_OPTIONS=	x11
+
+.include "../../mk/bsd.prefs.mk"
+.include "../../mk/bsd.options.mk"
+
+.if !empty(PKG_OPTIONS:Mx11)
+# Support for native X11 paths as an option
+# This code is no-op for modular X11, however for simplicity don't make it conditional.
+SUBST_CLASSES+=			x11findlib
+SUBST_MESSAGE.x11findlib=	Fixing find_library() for native X11.
+SUBST_STAGE.x11findlib=		pre-configure
+SUBST_FILES.x11findlib=		Lib/ctypes/util.py
+SUBST_SED.x11findlib=		-e 's!\(-Wl,-t -o\)!${COMPILER_RPATH_FLAG}${X11BASE}/lib -L${X11BASE}/lib \1!'
+
+# Required to get definition of X11BASE and retain X11 rpath paths for linker
+# We need to pass rpath to _ctypes.so to get functional dlopen(3) for X11 libs
+USE_X11=		yes
+
+SUBST_CLASSES+=		cdlopen
+SUBST_MESSAGE.cdlopen=	Handle X11BASE paths in dlopen(3) calls of _ctypes.so
+SUBST_STAGE.cdlopen=	pre-configure
+SUBST_FILES.cdlopen=	setup.py
+SUBST_SED.cdlopen=	-e "s!\(libraries=\[\],\)!\1 runtime_library_dirs=\['${X11BASE}/lib'\],!"
+.endif