1 files changed, 84 insertions, 0 deletions
diff --git a/waflib/extras/syms.py b/waflib/extras/syms.py
new file mode 100644
index 00000000..dfa00593
--- /dev/null
+++ b/waflib/extras/syms.py
@@ -0,0 +1,84 @@
+#! /usr/bin/env python
+# encoding: utf-8
+
+"""
+This tool supports the export_symbols_regex to export the symbols in a shared library.
+by default, all symbols are exported by gcc, and nothing by msvc.
+to use the tool, do something like:
+
+def build(ctx):
+	ctx(features='c cshlib syms', source='a.c b.c', export_symbols_regex='mylib_.*', target='testlib')
+
+only the symbols starting with 'mylib_' will be exported.
+"""
+
+import re
+from waflib.Context import STDOUT
+from waflib.Task import Task
+from waflib.Errors import WafError
+from waflib.TaskGen import feature, after_method
+
+class gen_sym(Task):
+	def run(self):
+		obj = self.inputs[0]
+		kw = {}
+
+		reg = getattr(self.generator, 'export_symbols_regex', '.+?')
+		if 'msvc' in (self.env.CC_NAME, self.env.CXX_NAME):
+			re_nm = re.compile(r'External\s+\|\s+_(?P<symbol>%s)\b' % reg)
+			cmd = (self.env.DUMPBIN or ['dumpbin']) + ['/symbols', obj.abspath()]
+		else:
+			if self.env.DEST_BINFMT == 'pe': #gcc uses nm, and has a preceding _ on windows
+				re_nm = re.compile(r'(T|D)\s+_(?P<symbol>%s)\b' % reg)
+			elif self.env.DEST_BINFMT=='mac-o':
+				re_nm=re.compile(r'(T|D)\s+(?P<symbol>_?%s)\b' % reg)
+			else:
+				re_nm = re.compile(r'(T|D)\s+(?P<symbol>%s)\b' % reg)
+			cmd = (self.env.NM or ['nm']) + ['-g', obj.abspath()]
+		syms = [m.group('symbol') for m in re_nm.finditer(self.generator.bld.cmd_and_log(cmd, quiet=STDOUT, **kw))]
+		self.outputs[0].write('%r' % syms)
+
+class compile_sym(Task):
+	def run(self):
+		syms = {}
+		for x in self.inputs:
+			slist = eval(x.read())
+			for s in slist:
+				syms[s] = 1
+		lsyms = list(syms.keys())
+		lsyms.sort()
+		if self.env.DEST_BINFMT == 'pe':
+			self.outputs[0].write('EXPORTS\n' + '\n'.join(lsyms))
+		elif self.env.DEST_BINFMT == 'elf':
+			self.outputs[0].write('{ global:\n' + ';\n'.join(lsyms) + ";\nlocal: *; };\n")
+		elif self.env.DEST_BINFMT=='mac-o':
+			self.outputs[0].write('\n'.join(lsyms) + '\n')
+		else:
+			raise WafError('NotImplemented')
+
+@feature('syms')
+@after_method('process_source', 'process_use', 'apply_link', 'process_uselib_local', 'propagate_uselib_vars')
+def do_the_symbol_stuff(self):
+	def_node = self.path.find_or_declare(getattr(self, 'sym_file', self.target + '.def'))
+	compiled_tasks = getattr(self, 'compiled_tasks', None)
+	if compiled_tasks:
+		ins = [x.outputs[0] for x in compiled_tasks]
+		self.gen_sym_tasks = [self.create_task('gen_sym', x, x.change_ext('.%d.sym' % self.idx)) for x in ins]
+		self.create_task('compile_sym', [x.outputs[0] for x in self.gen_sym_tasks], def_node)
+
+	link_task = getattr(self, 'link_task', None)
+	if link_task:
+		self.link_task.dep_nodes.append(def_node)
+
+		if 'msvc' in (self.env.CC_NAME, self.env.CXX_NAME):
+			self.link_task.env.append_value('LINKFLAGS', ['/def:' + def_node.bldpath()])
+		elif self.env.DEST_BINFMT == 'pe':
+			# gcc on windows takes *.def as an additional input
+			self.link_task.inputs.append(def_node)
+		elif self.env.DEST_BINFMT == 'elf':
+			self.link_task.env.append_value('LINKFLAGS', ['-Wl,-version-script', '-Wl,' + def_node.bldpath()])
+		elif self.env.DEST_BINFMT=='mac-o':
+			self.link_task.env.append_value('LINKFLAGS',['-Wl,-exported_symbols_list,' + def_node.bldpath()])
+		else:
+			raise WafError('NotImplemented')
+