Description redacted.

--
PiperOrigin-RevId: 144983864
MOS_MIGRATED_REVID=144983864

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

@@ -261,6 +261,7 @@ ImmutableList<String> evaluate(Iterable<String> features) {
   private final String targetCpu;
   private final String targetSystemName;
   private final String targetLibc;
+  private final String targetOS;
   private final LipoMode lipoMode;
   private final PathFragment crosstoolTopPathFragment;
 
@@ -352,6 +353,7 @@ protected CppConfiguration(CppConfigurationParameters params)
     this.lipoMode = cppOptions.getLipoMode();
     this.targetSystemName = toolchain.getTargetSystemName();
     this.targetLibc = toolchain.getTargetLibc();
+    this.targetOS = toolchain.getCcTargetOs();
     this.crosstoolTop = params.crosstoolTop;
     this.ccToolchainLabel = params.ccToolchainLabel;
     this.compilationMode = params.commonOptions.compilationMode;
@@ -1177,6 +1179,11 @@ public String getTargetCpu() {
     return targetCpu;
   }
 
+  /** Unused, for compatibility with things internal to Google. */
+  public String getTargetOS() {
+    return targetOS;
+  }
+
   /**
    * Returns the path fragment that is either absolute or relative to the
    * execution root that can be used to execute the given tool.

src/main/protobuf/crosstool_config.proto

@@ -449,7 +449,10 @@ message CToolchain {
   // why they are recorded here.
   repeated string debian_extra_requires = 33;
 
-  // Next free id: 55
+  // Unused, for compatibility with things internal to Google.
+  optional string cc_target_os = 55;
+
+  // Next free id: 56
 }
 
 message ToolPath {