[sdk][bazel] Generate one header inclusion test per library.

Bug: DX-697
Change-Id: Iecc8f6498f568965b35566ba84e0b01576891efc

scripts/sdk/bazel/create_test_workspace.py

@@ -79,16 +79,17 @@ def create_test_workspace(sdk, output, workspace_info):
                is_executable=True)
 
     if workspace_info.with_cc:
-        # Generate test to verify that headers compile fine.
-        headers = workspace_info.headers
-        header_base = os.path.join(output, 'headers')
-        write_file(make_dir(os.path.join(header_base, 'BUILD')),
-                   'headers_build', {
-            'deps': list(filter(lambda k: headers[k], headers.keys())),
-        })
-        write_file(make_dir(os.path.join(header_base, 'headers.cc')),
-                   'headers', {
-            'headers': headers,
-        })
+        # Generate tests to verify that headers compile fine.
+        for target, files in workspace_info.headers.iteritems():
+            if not files:
+                continue
+            dir = os.path.join(output, 'headers', target[2:])
+            write_file(make_dir(os.path.join(dir, 'BUILD')),
+                       'headers_build', {
+                'dep': target,
+                'headers': files,
+            })
+            write_file(make_dir(os.path.join(dir, 'headers.cc')),
+                       'headers', {'headers': files})
 
     return True

scripts/sdk/bazel/templates/tests/headers.mako

@@ -2,13 +2,8 @@
 
 // This file verifies that all headers included in an SDK are valid.
 
-% for dep, headers in sorted(data['headers'].iteritems()):
-  % if headers:
-// ${dep}
-    % for header in headers:
+% for header in sorted(data['headers']):
 #include "${header}"
-    % endfor
-  % endif
 % endfor
 
 int main(int argc, const char** argv) {}

scripts/sdk/bazel/templates/tests/headers_build.mako

@@ -6,8 +6,6 @@ cc_binary(
         "headers.cc",
     ],
     deps = [
-        % for dep in sorted(data['deps']):
-        "@fuchsia_sdk${dep}",
-        % endfor
+        "@fuchsia_sdk${data['dep']}",
     ],
 )