Add automatic build of libcapnp if it's not detected

buildutils/misc.py

@@ -0,0 +1,65 @@
+"""misc build utility functions"""
+
+# Copyright (c) PyZMQ Developers
+# Distributed under the terms of the Modified BSD License.
+
+import os
+import sys
+import logging
+from distutils import ccompiler
+from distutils.sysconfig import customize_compiler
+from pipes import quote
+from subprocess import Popen, PIPE
+
+pjoin = os.path.join
+
+
+if sys.version_info[0] >= 3:
+    u = lambda x: x
+else:
+    u = lambda x: x.decode('utf8', 'replace')
+
+
+def customize_mingw(cc):
+    # strip -mno-cygwin from mingw32 (Python Issue #12641)
+    for cmd in [cc.compiler, cc.compiler_cxx, cc.compiler_so, cc.linker_exe, cc.linker_so]:
+        if '-mno-cygwin' in cmd:
+            cmd.remove('-mno-cygwin')
+
+    # remove problematic msvcr90
+    if 'msvcr90' in cc.dll_libraries:
+        cc.dll_libraries.remove('msvcr90')
+
+
+def get_compiler(compiler, **compiler_attrs):
+    """get and customize a compiler"""
+    if compiler is None or isinstance(compiler, str):
+        cc = ccompiler.new_compiler(compiler=compiler)
+        # customize_compiler(cc)
+        if cc.compiler_type == 'mingw32':
+            customize_mingw(cc)
+    else:
+        cc = compiler
+
+    for name, val in compiler_attrs.items():
+        setattr(cc, name, val)
+
+    return cc
+
+
+def get_output_error(cmd):
+    """Return the exit status, stdout, stderr of a command"""
+    if not isinstance(cmd, list):
+        cmd = [cmd]
+    logging.debug("Running: %s", ' '.join(map(quote, cmd)))
+    try:
+        result = Popen(cmd, stdout=PIPE, stderr=PIPE)
+    except IOError as e:
+        return -1, u(''), u('Failed to run %r: %r' % (cmd, e))
+    so, se = result.communicate()
+    # unicode:
+    so = so.decode('utf8', 'replace')
+    se = se.decode('utf8', 'replace')
+
+    return result.returncode, so, se
+