Add --host_per_file_copt (bazelbuild#16695)

Fixes bazelbuild#12406

Closes bazelbuild#16618.

PiperOrigin-RevId: 486616830
Change-Id: Icd9774b2d05d09288a34375e229b13e2a74cf3d7

Co-authored-by: Keith Smiley <keithbsmiley@gmail.com>
Co-authored-by: kshyanashree <109167932+kshyanashree@users.noreply.github.com>

src/main/java/com/google/devtools/build/lib/rules/cpp/CppOptions.java

@@ -636,6 +636,28 @@ public Label getPropellerOptimizeLabel() {
       help = "Additional option to pass to gcc when compiling C source files for host tools.")
   public List<String> hostConlyoptList;
 
+  @Option(
+      name = "host_per_file_copt",
+      allowMultiple = true,
+      converter = PerLabelOptions.PerLabelOptionsConverter.class,
+      defaultValue = "null",
+      documentationCategory = OptionDocumentationCategory.OUTPUT_PARAMETERS,
+      effectTags = {OptionEffectTag.ACTION_COMMAND_LINES, OptionEffectTag.AFFECTS_OUTPUTS},
+      help =
+          "Additional options to selectively pass to the C/C++ compiler when "
+              + "compiling certain files in the host or exec configurations. "
+              + "This option can be passed multiple times. "
+              + "Syntax: regex_filter@option_1,option_2,...,option_n. Where regex_filter stands "
+              + "for a list of include and exclude regular expression patterns (Also see "
+              + "--instrumentation_filter). option_1 to option_n stand for "
+              + "arbitrary command line options. If an option contains a comma it has to be "
+              + "quoted with a backslash. Options can contain @. Only the first @ is used to "
+              + "split the string. Example: "
+              + "--host_per_file_copt=//foo/.*\\.cc,-//foo/bar\\.cc@-O0 adds the -O0 "
+              + "command line option to the gcc command line of all cc files in //foo/ "
+              + "except bar.cc.")
+  public List<PerLabelOptions> hostPerFileCoptsList;
+
   @Option(
       name = "host_linkopt",
       defaultValue = "null",
@@ -1218,6 +1240,7 @@ public FragmentOptions getHost() {
     host.coptList = coptListBuilder.addAll(hostCoptList).build();
     host.cxxoptList = cxxoptListBuilder.addAll(hostCxxoptList).build();
     host.conlyoptList = ImmutableList.copyOf(hostConlyoptList);
+    host.perFileCopts = ImmutableList.copyOf(hostPerFileCoptsList);
     host.linkoptList = ImmutableList.copyOf(hostLinkoptList);
 
     host.useStartEndLib = useStartEndLib;
@@ -1252,6 +1275,7 @@ public FragmentOptions getHost() {
     host.hostCppCompiler = hostCppCompiler;
     host.hostCrosstoolTop = hostCrosstoolTop;
     host.hostCxxoptList = hostCxxoptList;
+    host.hostPerFileCoptsList = hostPerFileCoptsList;
     host.hostLibcTopLabel = hostLibcTopLabel;
     host.hostLinkoptList = hostLinkoptList;
 

src/test/java/com/google/devtools/build/lib/rules/cpp/BUILD

@@ -377,6 +377,7 @@ java_test(
     srcs = ["CompileBuildVariablesTest.java"],
     deps = [
         "//src/main/java/com/google/devtools/build/lib/analysis:analysis_cluster",
+        "//src/main/java/com/google/devtools/build/lib/analysis:configured_target",
         "//src/main/java/com/google/devtools/build/lib/rules/cpp",
         "//src/main/java/com/google/devtools/build/lib/vfs",
         "//src/main/java/com/google/devtools/build/lib/vfs:pathfragment",

src/test/java/com/google/devtools/build/lib/rules/cpp/CompileBuildVariablesTest.java

@@ -18,6 +18,7 @@
 
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.Iterables;
+import com.google.devtools.build.lib.analysis.ConfiguredTarget;
 import com.google.devtools.build.lib.analysis.configuredtargets.RuleConfiguredTarget;
 import com.google.devtools.build.lib.analysis.util.AnalysisMock;
 import com.google.devtools.build.lib.analysis.util.BuildViewTestCase;
@@ -34,21 +35,21 @@
 @RunWith(JUnit4.class)
 public class CompileBuildVariablesTest extends BuildViewTestCase {
 
-  private CppCompileAction getCppCompileAction(final String label, final String name) throws
-      Exception {
+  private CppCompileAction getCppCompileAction(ConfiguredTarget target, final String name)
+      throws Exception {
     return (CppCompileAction)
         getGeneratingAction(
             Iterables.find(
-                getGeneratingAction(getFilesToBuild(getConfiguredTarget(label)).getSingleton())
-                    .getInputs()
-                    .toList(),
+                getGeneratingAction(getFilesToBuild(target).getSingleton()).getInputs().toList(),
                 (artifact) -> artifact.getExecPath().getBaseName().startsWith(name)));
   }
 
   /** Returns active build variables for a compile action of given type for given target. */
   protected CcToolchainVariables getCompileBuildVariables(String label, String name)
       throws Exception {
-    return getCppCompileAction(label, name).getCompileCommandLine().getVariables();
+    return getCppCompileAction(getConfiguredTarget(label), name)
+        .getCompileCommandLine()
+        .getVariables();
   }
 
   @Test
@@ -100,7 +101,10 @@ public void testPresenceOfUserCompileFlags() throws Exception {
   public void testPerFileCoptsAreInUserCompileFlags() throws Exception {
     scratch.file("x/BUILD", "cc_binary(name = 'bin', srcs = ['bin.cc'])");
     scratch.file("x/bin.cc");
-    useConfiguration("--per_file_copt=//x:bin@-foo", "--per_file_copt=//x:bar\\.cc@-bar");
+    useConfiguration(
+        "--per_file_copt=//x:bin@-foo",
+        "--per_file_copt=//x:bar\\.cc@-bar",
+        "--host_per_file_copt=//x:bin@-baz");
 
     CcToolchainVariables variables = getCompileBuildVariables("//x:bin", "bin");
 
@@ -110,6 +114,27 @@ public void testPerFileCoptsAreInUserCompileFlags() throws Exception {
     assertThat(copts).containsExactly("-foo").inOrder();
   }
 
+  @Test
+  public void testHostPerFileCoptsAreInUserCompileFlags() throws Exception {
+    scratch.file("x/BUILD", "cc_binary(name = 'bin', srcs = ['bin.cc'])");
+    scratch.file("x/bin.cc");
+    useConfiguration(
+        "--host_per_file_copt=//x:bin@-foo",
+        "--host_per_file_copt=//x:bar\\.cc@-bar",
+        "--per_file_copt=//x:bin@-baz");
+
+    ConfiguredTarget target = getConfiguredTarget("//x:bin", getHostConfiguration());
+    CcToolchainVariables variables =
+        getCppCompileAction(target, "bin").getCompileCommandLine().getVariables();
+
+    ImmutableList<String> copts =
+        CcToolchainVariables.toStringList(
+            variables, CompileBuildVariables.USER_COMPILE_FLAGS.getVariableName());
+    assertThat(copts).contains("-foo");
+    assertThat(copts).doesNotContain("-bar");
+    assertThat(copts).doesNotContain("-baz");
+  }
+
   @Test
   public void testPresenceOfSysrootBuildVariable() throws Exception {
     AnalysisMock.get()