waflib: extras: add c_cross_gnu tool that shortcuts cross-compilation config

waflib/extras/c_cross_gnu.py

@@ -0,0 +1,147 @@
+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+# Tool to provide dedicated variables for cross-compilation
+
+__author__ = __maintainer__ = "Jérôme Carretero <cJ-waf@zougloub.eu>"
+__copyright__ = "Jérôme Carretero, 2014"
+
+"""
+
+This tool allows to use environment variables to define cross-compilation things,
+mostly used when you use build variants.
+
+Usage:
+
+- In your build script::
+
+    def configure(cfg):
+      ...
+      conf.load('c_cross_gnu')
+      for variant in x_variants:
+        conf.xcheck_cross()
+        conf.xcheck_cross_var('POUET')
+        ...
+
+      ...
+
+- Then::
+
+    CHOST=arm-hardfloat-linux-gnueabi waf configure
+
+    env arm-hardfloat-linux-gnueabi-CC="clang -..." waf configure
+
+    CFLAGS=... CHOST=arm-hardfloat-linux-gnueabi HOST_CFLAGS=-g waf configure
+
+    HOST_CC="clang -..." waf configure
+
+"""
+
+import os, shutil
+from waflib import Utils, Configure
+
+try:
+	from shlex import quote
+except ImportError:
+	from pipes import quote
+
+@Configure.conf
+def xcheck_prog(conf, var, tool, cross=False):
+	value = os.environ.get(var, '')
+	value = Utils.to_list(value)
+
+	if not value:
+		return
+
+	conf.env[var] = value
+	if cross:
+		pretty = 'cross-compilation %s' % var
+	else:
+		pretty = var
+	conf.msg('Will use %s' % pretty,
+	 " ".join(quote(x) for x in value))
+
+@Configure.conf
+def xcheck_envar(conf, name, wafname=None, cross=False):
+	wafname = wafname or name
+	value = os.environ.get(name, None)
+	value = Utils.to_list(value)
+
+	if not value:
+		return
+
+	conf.env[wafname] += value
+	if cross:
+		pretty = 'cross-compilation %s' % wafname
+	else:
+		pretty = wafname
+	conf.msg('Will use %s' % pretty,
+	 " ".join(quote(x) for x in value))
+
+@Configure.conf
+def xcheck_host_prog(conf, name, tool, wafname=None):
+	wafname = wafname or name
+	host = conf.env.CHOST
+	specific = None
+	if host:
+		specific = os.environ.get('%s-%s' % (host[0], name), None)
+
+	if specific:
+		value = Utils.to_list(specific)
+		conf.env[wafname] += value
+		conf.msg('Will use cross-compilation %s' % name,
+		 " ".join(quote(x) for x in value))
+		return
+
+	conf.xcheck_prog('HOST_%s' % name, tool, cross=True)
+
+	if conf.env[wafname]:
+		return
+
+	value = None
+	if host:
+		value = '%s-%s' % (host[0], tool)
+
+	if value:
+		conf.env[wafname] = value
+		conf.msg('Will use cross-compilation %s' % wafname, value)
+
+@Configure.conf
+def xcheck_host_envar(conf, name, wafname=None):
+	wafname = wafname or name
+
+	host = conf.env.CHOST
+	specific = None
+	if host:
+		specific = os.environ.get('%s-%s' % (host[0], name), None)
+
+	if specific:
+		value = Utils.to_list(specific)
+		conf.env[wafname] += value
+		conf.msg('Will use cross-compilation %s' % name,
+		 " ".join(quote(x) for x in value))
+		return
+
+	conf.xcheck_envar('HOST_%s' % name, wafname, cross=True)
+
+
+@Configure.conf
+def xcheck_host(conf):
+	conf.xcheck_envar('CHOST', cross=True)
+	conf.xcheck_host_prog('CC', 'gcc')
+	conf.xcheck_host_prog('CXX', 'g++')
+	conf.xcheck_host_prog('LINK_CC', 'gcc')
+	conf.xcheck_host_prog('LINK_CXX', 'g++')
+	conf.xcheck_host_prog('AR', 'ar')
+	conf.xcheck_host_prog('AS', 'as')
+	conf.xcheck_host_prog('LD', 'ld')
+	conf.xcheck_host_envar('CFLAGS')
+	conf.xcheck_host_envar('CXXFLAGS')
+	conf.xcheck_host_envar('LINKFLAGS', 'LDFLAGS')
+	conf.xcheck_host_envar('LIB')
+	conf.xcheck_host_envar('PKG_CONFIG_PATH')
+	# TODO find a better solution than this ugliness
+	if conf.env.PKG_CONFIG_PATH:
+		conf.find_program('pkg-config', var='PKGCONFIG')
+		conf.env.PKGCONFIG = [
+		 'env', 'PKG_CONFIG_PATH=%s' % (conf.env.PKG_CONFIG_PATH[0])
+		] + conf.env.PKGCONFIG