Re #1469: Changed aconfigure to use pkg-config to detect ffmpeg dependencies. On systems where pkg-config is not available (such as Mac OS X), use the supplemented pkgconfig.py Python script. If Python is not available, users then need to configure CFLAGS and LDFLAGS manually prior to running configure

git-svn-id: http://svn.pjsip.org/repos/pjproject/trunk@4069 74dad513-b988-da41-8d7b-12977e46ad98

1 files changed, 171 insertions, 0 deletions

diff --git a/pkgconfig.py b/pkgconfig.py
new file mode 100644
index 00000000..496e311b
--- /dev/null
+++ b/pkgconfig.py
@@ -0,0 +1,171 @@
+import sys
+import os
+
+REMOVE_THESE = ["-I/usr/include", "-I/usr/include/", "-L/usr/lib", "-L/usr/lib/"]
+
+class Pkg:
+	def __init__(self, pkg_name):
+		self.name = pkg_name
+		self.priority = 0
+		self.vars = {}
+
+	def parse(self, pkg_config_path):
+		f = None
+		for pkg_path in pkg_config_path.split(':'):
+			if pkg_path[-1] != '/':
+				pkg_path += '/'
+			fname = pkg_path + self.name + '.pc'
+			try:
+				f = open(fname, "r")
+				break
+			except:
+				continue
+		if not f:
+		  	#sys.stderr.write("pkgconfig.py: unable to find %s.pc in %s\n" % (self.name, pkg_config_path))
+			return False
+
+		for line in f.readlines():
+			line = line.strip()
+			if not line:
+				continue
+			if line[0]=='#':
+				continue
+			pos1 = line.find('=')
+			pos2 = line.find(':')
+			if pos1 > 0 and (pos1 < pos2 or pos2 < 0):
+				pos = pos1
+			elif pos2 > 0 and (pos2 < pos1 or pos1 < 0):
+				pos = pos2
+			else:
+				continue
+			name = line[:pos].lower()
+			value = line[pos+1:]
+			self.vars[name] = value
+		f.close()
+
+		for name in self.vars.keys():
+			value = self.vars[name]
+			while True:
+				pos1 = value.find("${")
+				if pos1 < 0:
+					break
+				pos2 = value.find("}")
+				if pos2 < 0:
+					break
+				value = value.replace(value[pos1:pos2+1], self.vars[value[pos1+2:pos2]])
+			self.vars[name] = value
+		return True
+
+	def requires(self):
+		if not 'requires' in self.vars:
+			return []
+		deps = []
+		req_list = self.vars['requires']
+		for req_item in req_list.split(','):
+			req_item = req_item.strip()
+			for i in range(len(req_item)):
+				if "=<>".find(req_item[i]) >= 0:
+					deps.append(req_item[:i].strip())
+					break
+		return deps
+
+	def libs(self):
+		if not 'libs' in self.vars:
+			return []
+		return self.vars['libs'].split(' ')
+
+	def cflags(self):
+		if not 'cflags' in self.vars:
+			return []
+		return self.vars['cflags'].split(' ')
+
+
+def calculate_pkg_priority(pkg, pkg_dict, loop_cnt):
+	if loop_cnt > 10:
+		sys.stderr.write("Circular dependency with pkg %s\n" % (pkg))
+		return 0
+	reqs = pkg.requires()
+	prio = 1
+	for req in reqs:
+		if not req in pkg_dict:
+			continue
+		req_pkg = pkg_dict[req]
+		prio += calculate_pkg_priority(req_pkg, pkg_dict, loop_cnt+1)
+	return prio
+
+if __name__ == "__main__":
+	pkg_names = []
+	pkg_dict = {}
+	commands = []
+	exist_check = False
+
+	for i in range(1,len(sys.argv)):
+		if sys.argv[i][0] == '-':
+			cmd = sys.argv[i]
+			commands.append(cmd)
+			if cmd=='--exists':
+				exist_check = True
+			elif cmd=="--help":
+				print "This is not very helpful, is it"
+				sys.exit(0)
+			elif cmd=="--version":
+				print "0.1"
+				sys.exit(0)
+		else:
+			pkg_names.append(sys.argv[i])
+			
+	# Fix search path
+	PKG_CONFIG_PATH = os.getenv("PKG_CONFIG_PATH", "").strip()
+	if not PKG_CONFIG_PATH:
+		PKG_CONFIG_PATH="/usr/local/lib/pkgconfig:/usr/lib/pkgconfig"
+	PKG_CONFIG_PATH = PKG_CONFIG_PATH.replace(";", ":")
+
+	# Parse files
+	for pkg_name in pkg_names:
+		pkg = Pkg(pkg_name)
+		if not pkg.parse(PKG_CONFIG_PATH):
+			sys.exit(1)
+		pkg_dict[pkg_name] = pkg
+
+	if exist_check:
+		sys.exit(0)
+
+	# Calculate priority based on dependency
+	for pkg_name in pkg_dict.keys():
+		pkg = pkg_dict[pkg_name]
+		pkg.priority = calculate_pkg_priority(pkg, pkg_dict, 1)
+	
+	# Sort package based on dependency
+	pkg_names = sorted(pkg_names, key=lambda pkg_name: pkg_dict[pkg_name].priority, reverse=True)
+
+	# Get the options
+	opts = []
+	for cmd in commands:
+		if cmd=='--libs':
+			for pkg_name in pkg_names:
+				libs = pkg_dict[pkg_name].libs()
+				for lib in libs:
+					opts.append(lib)
+					if lib[:2]=="-l":
+						break
+			for pkg_name in pkg_names:
+				opts += pkg_dict[pkg_name].libs()
+		elif cmd=='--cflags':
+			for pkg_name in pkg_names:
+				opts += pkg_dict[pkg_name].cflags()
+		elif cmd[0]=='-':
+			sys.stderr.write("pkgconfig.py: I don't know how to handle " + sys.argv[i] + "\n")
+	
+	filtered_opts = []
+	for opt in opts:
+		opt = opt.strip()
+		if not opt:
+			continue
+		if REMOVE_THESE.count(opt) != 0:
+			continue
+		if filtered_opts.count(opt) != 0:
+			continue
+		filtered_opts.append(opt)
+
+	print ' '.join(filtered_opts)
+