C++ compiler can compile .h file, too.

backends.py

@@ -938,7 +938,6 @@ class NinjaBackend(Backend):
     def generate_gcc_pch_command(self, target, compiler, pch):
         commands = []
         commands += self.generate_basic_compiler_flags(target, compiler)
-        
         dst = os.path.join(self.get_target_private_dir(target),
                            os.path.split(pch)[-1] + '.' + compiler.get_pch_suffix())
         dep = dst + '.' + compiler.get_depfile_suffix()
@@ -953,7 +952,7 @@ class NinjaBackend(Backend):
             if len(pch) == 0:
                 continue
             if '/' not in pch[0] or '/' not in pch[-1]:
-                raise build.InvalidArguments('Precompiled header of "%s" must not be in the same direcotory as source, please put it in a subdirectory.' % target.get_basename())
+                raise build.InvalidArguments('Precompiled header of "%s" must not be in the same directory as source, please put it in a subdirectory.' % target.get_basename())
             compiler = self.get_compiler_for_lang(lang)
             if compiler.id == 'msvc':
                 src = os.path.join(self.build_to_src, target.get_source_subdir(), pch[-1])

build.py

@@ -319,7 +319,10 @@ class BuildTarget():
     def add_pch(self, language, pchlist):
         if len(pchlist) == 0:
             return
-        if len(pchlist) == 2:
+        elif len(pchlist) == 1:
+            if not environment.is_header(pchlist[0]):
+                raise InvalidArguments('Pch argument %s is not a header.' % pchlist[0])
+        elif len(pchlist) == 2:
             if environment.is_header(pchlist[0]):
                 if not environment.is_source(pchlist[1]):
                     raise InvalidArguments('PCH definition must contain one header and at most one source.')

environment.py

@@ -775,7 +775,7 @@ def detect_ninja():
 
 
 header_suffixes = ['h', 'hh', 'hpp', 'hxx', 'H']
-cpp_suffixes = ['cc', 'cpp', 'cxx', 'hh', 'hpp', 'hxx']
+cpp_suffixes = ['cc', 'cpp', 'cxx', 'h', 'hh', 'hpp', 'hxx', 'c++']
 c_suffixes = ['c']
 clike_suffixes = c_suffixes + cpp_suffixes