Merge pull request #2013 from heinrich5991/pr_ddnet_stub_curl

Eliminate static libcurl dependency, second try

ddnet-libs

@@ -1 +1 @@
-Subproject commit 593aa3a26573cc15e88a7cfcb07f67c2e06421c5
+Subproject commit f7cd1e1dc1c7ab630f478d30ada15c86943ca984

scripts/generate_fake_curl.py

@@ -0,0 +1,74 @@
+#!/usr/bin/env python3
+import argparse
+import os
+import re
+import subprocess
+import tempfile
+
+os.chdir(os.path.dirname(__file__) + "/..")
+PATH = "src/"
+
+
+CURL_RE=re.compile(r"\bcurl_\w*")
+
+def get_curl_calls(path):
+	names = set()
+	for dir, _, files in os.walk(path):
+		for filename in files:
+			if (filename.endswith(".cpp") or
+					filename.endswith(".c") or
+					filename.endswith(".h")):
+				with open(os.path.join(dir, filename)) as f:
+					contents = f.read()
+				names = names.union(CURL_RE.findall(contents))
+	return names
+
+def assembly_source(names):
+	names = sorted(names)
+	result = []
+	for name in names:
+		result.append(".type {},@function".format(name))
+	for name in names:
+		result.append(".global {}".format(name))
+	for name in names:
+		result.append("{}:".format(name))
+	return "\n".join(result + [""])
+
+DEFAULT_OUTPUT="libcurl.so"
+DEFAULT_SONAME="libcurl.so.4"
+
+def main():
+	p = argparse.ArgumentParser(description="Create a stub shared object for linking")
+	p.add_argument("-k", "--keep", action="store_true", help="Keep the intermediary assembly file")
+	p.add_argument("--output", help="Output filename (default: {})".format(DEFAULT_OUTPUT), default=DEFAULT_OUTPUT)
+	p.add_argument("--soname", help="soname of the produced shared object (default: {})".format(DEFAULT_SONAME), default=DEFAULT_SONAME)
+	p.add_argument("--functions", metavar="FUNCTION", nargs="+", help="Function symbols that should be put into the shared object (default: look for curl_* names in the source code)")
+	p.add_argument("--link-args", help="Colon-separated list of additional linking arguments")
+	args = p.parse_args()
+
+	if args.functions is not None:
+		functions = args.functions
+	else:
+		functions = get_curl_calls(PATH)
+	extra_link_args = []
+	if args.link_args:
+		extra_link_args = args.link_args.split(":")
+
+	with tempfile.NamedTemporaryFile("w", suffix=".s", delete=not args.keep) as f:
+		if args.keep:
+			print("using {} as temporary file".format(f.name))
+		f.write(assembly_source(functions))
+		f.flush()
+		subprocess.check_call([
+			"cc",
+		] + extra_link_args + [
+			"-shared",
+			"-nostdlib", # don't need to link to libc
+			"-Wl,-soname,{}".format(args.soname),
+			"-o", args.output,
+			f.name,
+		])
+		subprocess.check_call(["strip", args.output])
+
+if __name__ == '__main__':
+	main()