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+# Copyright (c) 2011 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# This file is meant to be included into an target to create a unittest that
+# invokes a set of no-compile tests. A no-compile test is a test that asserts
+# a particular construct will not compile.
+#
+# Also see:
+# http://dev.chromium.org/developers/testing/no-compile-tests
+#
+# To use this, create a gyp target with the following form:
+#
+# import("//build/nocompile.gni")
+# nocompile_test("my_module_nc_unittests") {
+# sources = [
+# 'nc_testset_1.nc',
+# 'nc_testset_2.nc',
+# ]
+#
+# # optional extra include dirs:
+# include_dirs = [ ... ]
+# }
+#
+# The .nc files are C++ files that contain code we wish to assert will not
+# compile. Each individual test case in the file should be put in its own
+# #ifdef section. The expected output should be appended with a C++-style
+# comment that has a python list of regular expressions. This will likely
+# be greater than 80-characters. Giving a solid expected output test is
+# important so that random compile failures do not cause the test to pass.
+#
+# Example .nc file:
+#
+# #if defined(TEST_NEEDS_SEMICOLON) // [r"expected ',' or ';' at end of input"]
+#
+# int a = 1
+#
+# #elif defined(TEST_NEEDS_CAST) // [r"invalid conversion from 'void*' to 'char*'"]
+#
+# void* a = NULL;
+# char* b = a;
+#
+# #endif
+#
+# If we needed disable TEST_NEEDS_SEMICOLON, then change the define to:
+#
+# DISABLE_TEST_NEEDS_SEMICOLON
+# TEST_NEEDS_CAST
+#
+# The lines above are parsed by a regexp so avoid getting creative with the
+# formatting or ifdef logic; it will likely just not work.
+#
+# Implementation notes:
+# The .nc files are actually processed by a python script which executes the
+# compiler and generates a .cc file that is empty on success, or will have a
+# series of #error lines on failure, and a set of trivially passing gunit
+# TEST() functions on success. This allows us to fail at the compile step when
+# something goes wrong, and know during the unittest run that the test was at
+# least processed when things go right.
+
+import("//build/config/clang/clang.gni")
+import("//build/config/python.gni")
+import("//build/toolchain/toolchain.gni")
+import("//testing/test.gni")
+
+declare_args() {
+ # TODO(crbug.com/105388): make sure no-compile test is not flaky.
+ enable_nocompile_tests = (is_linux || is_chromeos || is_apple) && is_clang &&
+ host_cpu == target_cpu
+}
+
+if (enable_nocompile_tests) {
+ import("//build/config/c++/c++.gni")
+ import("//build/config/sysroot.gni")
+ template("nocompile_test") {
+ nocompile_target = target_name + "_run_nocompile"
+
+ action_foreach(nocompile_target) {
+ testonly = true
+ script = "//tools/nocompile_driver.py"
+ sources = invoker.sources
+ deps = invoker.deps
+ if (defined(invoker.public_deps)) {
+ public_deps = invoker.public_deps
+ }
+
+ result_path = "$target_gen_dir/{{source_name_part}}_nc.cc"
+ depfile = "${result_path}.d"
+ outputs = [ result_path ]
+ args = [
+ rebase_path("$clang_base_path/bin/clang++", root_build_dir),
+ "4", # number of compilers to invoke in parallel.
+ "{{source}}",
+ rebase_path(result_path, root_build_dir),
+ "--",
+ "-nostdinc++",
+ "-isystem" + rebase_path("$libcxx_prefix/include", root_build_dir),
+ "-isystem" + rebase_path("$libcxxabi_prefix/include", root_build_dir),
+ "-std=c++14",
+ "-Wall",
+ "-Werror",
+ "-Wfatal-errors",
+ "-Wthread-safety",
+ "-I" + rebase_path("//", root_build_dir),
+ "-I" + rebase_path("//third_party/abseil-cpp/", root_build_dir),
+ "-I" + rebase_path("//buildtools/third_party/libc++/", root_build_dir),
+ "-I" + rebase_path(root_gen_dir, root_build_dir),
+
+ # TODO(https://crbug.com/989932): Track build/config/compiler/BUILD.gn
+ "-Wno-implicit-int-float-conversion",
+ ]
+
+ if (is_apple && host_os != "mac") {
+ args += [ "--target=x86_64-apple-macos" ]
+ }
+
+ # Iterate over any extra include dirs and append them to the command line.
+ if (defined(invoker.include_dirs)) {
+ foreach(include_dir, invoker.include_dirs) {
+ args += [ "-I" + rebase_path(include_dir, root_build_dir) ]
+ }
+ }
+
+ if (sysroot != "") {
+ args += [
+ "--sysroot",
+ rebase_path(sysroot, root_build_dir),
+ ]
+ }
+ }
+
+ test(target_name) {
+ deps = invoker.deps + [ ":$nocompile_target" ]
+ sources = get_target_outputs(":$nocompile_target")
+ }
+ }
+}