fix setup.py to build without a compiler

git-svn-id: http://simplejson.googlecode.com/svn/trunk@96 a4795897-2c25-0410-b006-0d3caba88fa1

setup.py

@@ -46,6 +46,11 @@
 """.splitlines()))
 
 
-BUILD_EXT_WARNING="""\
-WARNING: The C extension could not be compiled, speedups are not enabled.
+speedups = Feature(
+    "options C speed-enhancement modules",
+    standard=True,
+    ext_modules = [
+        Extension("simplejson._speedups", ["simplejson/_speedups.c"]),
+    ],
+)
 
@@ -51,6 +56,6 @@
 
-Below is the output showing how the compilation failed:
-"""
+class BuildFailed(Exception):
+    pass
 
 class ve_build_ext(build_ext):
     # This class allows C extension building to fail.
@@ -59,9 +64,9 @@
         try:
             build_ext.run(self)
         except DistutilsPlatformError, x:
-            self._unavailable(x)
+            raise BuildFailed()
 
     def build_extension(self, ext):
         try:
             build_ext.build_extension(self, ext)
         except (CCompilerError, DistutilsExecError), x:
@@ -63,13 +68,7 @@
 
     def build_extension(self, ext):
         try:
             build_ext.build_extension(self, ext)
         except (CCompilerError, DistutilsExecError), x:
-           self._unavailable(x)
-
-    def _unavailable(self, exc):
-         print '*'*70
-         print BUILD_EXT_WARNING
-         print exc
-         print '*'*70
+            raise BuildFailed()
 
@@ -75,11 +74,9 @@
 
-speedups = Feature(
-    "options C speed-enhancement modules",
-    standard=True,
-    ext_modules = [
-        Extension("simplejson._speedups", ["simplejson/_speedups.c"]),
-    ],
-)
+def run_setup(with_binary):
+    if with_binary:
+        features = {'speedups': speedups}
+    else:
+        features = {}
 
     setup(
         name="simplejson",
@@ -95,6 +92,6 @@
         platforms=['any'],
         test_suite="simplejson.tests",
         zip_safe=True,
-    features={'speedups': speedups},
+        features=features,
         cmdclass={'build_ext': ve_build_ext},
     )
@@ -99,2 +96,19 @@
         cmdclass={'build_ext': ve_build_ext},
     )
+
+try:
+    run_setup(True)
+except BuildFailed:
+    BUILD_EXT_WARNING = "WARNING: The C extension could not be compiled, speedups are not enabled."
+    print '*' * 75
+    print BUILD_EXT_WARNING
+    print "Failure information, if any, is above."
+    print "I'm retrying the build without the C extension now."
+    print '*' * 75
+
+    run_setup(False)
+
+    print '*' * 75
+    print BUILD_EXT_WARNING
+    print "Plain-Python installation succeeded."
+    print '*' * 75