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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',
# ]
# }
#
# 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("//testing/test.gni")
declare_args() {
# TODO(crbug.com/105388): Disabled until http://crbug.com/105388 is resolved.
enable_nocompile_tests = false
}
if (enable_nocompile_tests) {
template("nocompile_test") {
nocompile_target = target_name + "_run_nocompile"
action_foreach(nocompile_target) {
script = "//tools/nocompile_driver.py"
sources = invoker.sources
result_path = "$target_gen_dir/{{source_name_part}}_nc.cc"
depfile = "${result_path}.d"
outputs = [
result_path,
]
args = [
"4", # number of compilers to invoke in parallel.
"{{source}}",
"-Wall -Werror -Wfatal-errors " + "-I" +
rebase_path("//", root_build_dir),
"{{output}}",
]
}
test(target_name) {
deps = invoker.deps + [ ":$nocompile_target" ]
sources = get_target_outputs(":$nocompile_target")
}
}
}
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