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// Copyright 2020 The Bazel Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package com.google.devtools.build.lib.buildtool;
import static com.google.common.truth.Truth.assertThat;
import com.google.devtools.build.lib.buildtool.util.BuildIntegrationTestCase;
import com.google.devtools.build.lib.vfs.Path;
import java.io.IOException;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
/** Test of compilation of involving change command line arguments. */
@RunWith(JUnit4.class)
public class CompileAfterOptionChangeTest extends BuildIntegrationTestCase {
private void writeSourceFiles() throws IOException {
// A program that uses a command line argument to the compilation to
// create its output
write("pkg/hello.cc",
"#include <stdio.h>",
"#ifndef GREETING",
"#define GREETING DEFAULT_GREETING",
"#endif",
"extern void printf(const char *s);",
"int main() {",
" printf(\"%s\", GREETING \", World!\");",
"}");
}
/**
* Adds the specified options and builds the application.
* Note that any options set in buildApp() are sticky for subsequent calls
* to buildApp() from the same test method.
*/
private BuildResult buildApp(String... requestArgs) throws Exception {
addOptions(requestArgs);
return buildTarget("//pkg:hello");
}
/**
* Test of minor variations between actions. We pass command line options to
* gcc and test if we correctly rebuild the application
*/
@Test
public void testChangingCommandLineOptionRebuilds() throws Exception {
writeSourceFiles();
write("pkg/BUILD",
"cc_binary(name='hello',",
" malloc = '//base:system_malloc',",
" srcs=['hello.cc'],",
" defines = ['DEFAULT_GREETING=\\\\\\\"Hello\\\\\\\"'])");
// Here's why we need so many backslashes:
// Java source: "...'DEFAULT_GREETING=\\\\\\\"Hello\\\\\\\"'..."
// BUILD file: ...'DEFAULT_GREETING=\\\"Hello\\\"'...
// Makefile: ... -DDEFAULT_GREETING=\"Hello\" ...
// Arguments passed to sh: ... -DDEFAULT_GREETING=\"Hello\" ...
// Arguments passed to gcc: ... -DDEFAULT_GREETING="Hello" ...
// Blaze doesn't go through the "Makefile" or "sh" stages, but Blaze's
// treatment of backslash escapes is compatible with make-dbg, which does.
////////////////////////////////////////////////////////////////////////
// (1) Build using default request options:
buildApp();
Path hello = getExecutableLocation("//pkg:hello");
// Check the output of 'hello':
assertThat(run(hello)).isEqualTo("Hello, World!");
////////////////////////////////////////////////////////////////////////
// (2) Build again using a different cc_binary rule
write("pkg/BUILD",
"cc_binary(name='hello',",
" malloc = '//base:system_malloc',",
" srcs=['hello.cc'],",
" defines = ['DEFAULT_GREETING=\\'\"Hello again\"\\''])");
// Here's why we need so many quotes and backslashes:
// Java source: "...'DEFAULT_GREETING=\\'\"Hello again\"\\''..."
// BUILD file: ...'DEFAULT_GREETING=\'"Hello again"\''...
// (Makefile: ... -DDEFAULT_GREETING='"Hello again"' ...)
// (Arguments passed to sh: ... -DDEFAULT_GREETING='"Hello again"' ...)
// Arguments passed to gcc: ... -DDEFAULT_GREETING="Hello again" ...
// Blaze doesn't go through the "Makefile" or "sh" stages, but Blaze's
// treatment of backslash escapes is compatible with make-dbg, which does.
buildApp();
// Check that the output of 'hello' was affected by changing the rule
assertThat(run(hello)).isEqualTo("Hello again, World!");
////////////////////////////////////////////////////////////////////////
// (3) Build again using additional command line options:
write("pkg/BUILD",
"cc_binary(name='hello',",
" malloc = '//base:system_malloc',",
" srcs=['hello.cc'])");
buildApp("--copt", "-DGREETING=\"Hi\"");
// Check that the output of 'hello' was affected by adding the request
// options:
assertThat(run(hello)).isEqualTo("Hi, World!");
////////////////////////////////////////////////////////////////////////
// (4) Build again using different command line options:
// We need the -U option to override the -D option set by the
// previous call to buildApp() earlier in this method.
buildApp("--copt", "-UGREETING", "--copt", "-DGREETING=\"Goodbye\"");
// Check that the output of 'hello' was affected by changing the request
// options:
assertThat(run(hello)).isEqualTo("Goodbye, World!");
}
}