pylibfdt: Use environment to pass C flags and files

At present setup.py adjusts its command line when running, so that the
C flags and file list can be passed as arguments. Pass them in environment
variables instead, so we can avoid this messiness. It also allows us to
support the 'install' command.

Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

pylibfdt/Makefile.pylibfdt

@@ -7,7 +7,8 @@ PYMODULE = $(PYLIBFDT_objdir)/_libfdt.so
 
 $(PYMODULE): $(PYLIBFDT_srcs) $(WRAP)
 	@$(VECHO) PYMOD $@
-	python $(PYLIBFDT_objdir)/setup.py "$(CPPFLAGS)" $^
+	SOURCES="$^" CPPFLAGS="$(CPPFLAGS)" \
+	python $(PYLIBFDT_objdir)/setup.py --quiet build_ext --inplace
 	mv _libfdt.so $(PYMODULE)
 
 $(WRAP): $(PYLIBFDT_srcdir)/libfdt.swig

pylibfdt/setup.py

@@ -2,6 +2,9 @@
 
 """
 setup.py file for SWIG libfdt
+
+Files to be built into the extension are provided in SOURCES
+C flags to use are provided in CPPFLAGS
 """
 
 from distutils.core import setup, Extension
@@ -9,22 +12,15 @@ import os
 import sys
 
 progname = sys.argv[0]
-cflags = sys.argv[1]
-files = sys.argv[2:]
-
-if cflags:
-    cflags = [flag for flag in cflags.split(' ') if flag]
-else:
-    cflags = None
+files = os.environ['SOURCES'].split()
+cflags = os.environ['CPPFLAGS'].split()
 
 libfdt_module = Extension(
     '_libfdt',
     sources = files,
-    extra_compile_args =  cflags
+    extra_compile_args = cflags
 )
 
-sys.argv = [progname, '--quiet', 'build_ext', '--inplace']
-
 setup (name = 'libfdt',
        version = '0.1',
        author      = "Simon Glass <sjg@chromium.org>",