Generate per-architecture version scripts.

Bug: http://b/24767418
Change-Id: I23e49d8d30c0def3215ffbd99d09f207d9483624

libc/tools/genversion-scripts.py

@@ -0,0 +1,55 @@
+#!/usr/bin/python
+
+# This tool is used to generate the version scripts for libc and libm
+# for every architecture.
+
+import atexit
+import os.path
+import shutil
+import tempfile
+
+
+all_arches = ["arm", "arm64", "mips", "mips64", "x86", "x86_64"]
+bionic_libc_root = os.path.join(os.environ["ANDROID_BUILD_TOP"], "bionic/libc")
+bionic_libm_root = os.path.join(os.environ["ANDROID_BUILD_TOP"], "bionic/libm")
+libc_script = os.path.join(bionic_libc_root, "libc.map.txt")
+libm_script = os.path.join(bionic_libm_root, "libm.map.txt")
+
+# TODO (dimity): generate architecture-specific version scripts as part of build
+
+# temp directory where we store all intermediate files
+bionic_temp = tempfile.mkdtemp(prefix="bionic_genversionscripts")
+# Make sure the directory is deleted when the script exits.
+atexit.register(shutil.rmtree, bionic_temp)
+
+bionic_libc_root = os.path.join(os.environ["ANDROID_BUILD_TOP"], "bionic/libc")
+
+warning = "Generated by genversionscripts.py. Do not edit."
+
+
+class VersionScriptGenerator(object):
+
+  def run(self):
+    for script in [libc_script, libm_script]:
+      basename = os.path.basename(script)
+      dirname = os.path.dirname(script)
+      for arch in all_arches:
+        name = basename.split(".")[0] + "." + arch + ".map"
+        tmp_path = os.path.join(bionic_temp, name)
+        dest_path = os.path.join(dirname, name)
+        with open(tmp_path, "w") as fout:
+          with open(script, "r") as fin:
+            fout.write("# %s\n" % warning)
+            for line in fin:
+              index = line.find("#")
+              if index != -1:
+                arches = line[index+1:].split()
+                if arch not in arches:
+                  continue
+              fout.write(line)
+        shutil.copyfile(tmp_path, dest_path)
+
+
+generator = VersionScriptGenerator()
+generator.run()
+