Rework POW build so that we can use static libraries again.

svn path=/configure; revision=3602

1 files changed, 78 insertions, 0 deletions

diff --git a/pow/build.py b/pow/build.py
new file mode 100644
index 00000000..41859052
--- /dev/null
+++ b/pow/build.py
@@ -0,0 +1,78 @@
+"""
+Hack to build our Python extension module.
+
+In a sane world, we'd just use the excellent distutils package, which
+would do all the work for us.  But we have this little problem of
+sometimes needing to use a private copy of the OpenSSL libraries to
+kludge around obsolete system libraries, and a further problem that
+GNU ld has bizzare issues with linking static libraries into shared
+objects on 64-bit platforms.
+
+In the long term, this problem will go away, when everybody updates to
+a reasonable version of OpenSSL with CMS and RFC 3779 support enabled.
+When that happens, this whackiness should be replaced by a normal
+setup.py using distutils.
+
+In the meantime, we pull config information from distutils, but do the
+build ourselves.
+
+This is a minimal hack to get the job done, and probably a bit
+fragile.  Much of the code is taken from python-config and the
+distutils.sysconfig.customize_compiler.  If there's any real
+documentation on how to do this sort of thing, I have not found it
+yet.  YMMV.  Beware Of Dog.
+
+$Id$
+"""
+
+import os, subprocess, sys
+
+from distutils.sysconfig import (get_config_var as getvar,
+                                 get_python_inc as getinc)
+
+static_libraries = []
+other_libraries = []
+for lib in os.environ["AC_LIBS"].split():
+  if lib.startswith("-"):
+    other_libraries.append(lib)
+  else:
+    static_libraries.append(lib)
+
+cmd = getvar("CC").split()
+cmd.extend(("-c", "-o", "POW.o", "POW.c"))
+cmd.extend(os.environ["AC_CFLAGS"].split())
+cmd.append("-I%s" % getinc(plat_specific = False))
+cmd.append("-I%s" % getinc(plat_specific = True))
+cmd.extend(getvar("CFLAGS").split())
+cmd.extend(getvar("CCSHARED").split())
+print " ".join(cmd)
+r = subprocess.call(cmd)
+if r:
+  sys.exit(r)
+
+if static_libraries:
+  cmd = ["ld", "-r", "-o", "_POW.o", "POW.o"] + static_libraries
+  print " ".join(cmd)
+  r = subprocess.call(cmd)
+  if r:
+    sys.exit(r)
+else:
+  os.link("POW.o", "_POW.o")
+
+cmd = getvar("LDSHARED").split()
+cmd.extend(("-o", "POW/_POW.so", "_POW.o"))
+cmd.extend(os.environ["AC_LDFLAGS"].split())
+cmd.extend(getvar("LDFLAGS").split())
+cmd.extend(other_libraries)
+print " ".join(cmd)
+r = subprocess.call(cmd)
+if r:
+  sys.exit(r)
+
+objcopy = os.getenv("AC_OBJCOPY")
+if objcopy:
+  cmd = [objcopy, "-G", "init_POW", "-x", "POW/_POW.so"]
+  print " ".join(cmd)
+  r = subprocess.call(cmd)
+  if r:
+    sys.exit(r)