Support versioned shared library targets for cc_binary linkshared=1

This change allows versioned shared libraries (e.g. "libfoo.so.1.2") to be
built and linked.

--
PiperOrigin-RevId: 142193230
MOS_MIGRATED_REVID=142193230

2 files changed, 9 insertions, 1 deletions

diff --git a/src/main/java/com/google/devtools/build/lib/rules/cpp/CcBinary.java b/src/main/java/com/google/devtools/build/lib/rules/cpp/CcBinary.java
index 1cb110aab1..1f2428f1da 100644
--- a/src/main/java/com/google/devtools/build/lib/rules/cpp/CcBinary.java
+++ b/src/main/java/com/google/devtools/build/lib/rules/cpp/CcBinary.java
@@ -192,7 +192,9 @@ public abstract class CcBinary implements RuleConfiguredTargetFactory {
     }
 
     Artifact binary = ruleContext.getBinArtifact(binaryPath);
-    if (isLinkShared(ruleContext) && !CppFileTypes.SHARED_LIBRARY.matches(binary.getFilename())) {
+    if (isLinkShared(ruleContext)
+        && !CppFileTypes.SHARED_LIBRARY.matches(binary.getFilename())
+        && !CppFileTypes.VERSIONED_SHARED_LIBRARY.matches(binary.getFilename())) {
       ruleContext.attributeError("linkshared", "'linkshared' used in non-shared library");
       return null;
     }
diff --git a/src/main/java/com/google/devtools/build/lib/rules/cpp/CppLinkActionBuilder.java b/src/main/java/com/google/devtools/build/lib/rules/cpp/CppLinkActionBuilder.java
index 35f16bfbbc..2b0d081268 100644
--- a/src/main/java/com/google/devtools/build/lib/rules/cpp/CppLinkActionBuilder.java
+++ b/src/main/java/com/google/devtools/build/lib/rules/cpp/CppLinkActionBuilder.java
@@ -1537,8 +1537,14 @@ public class CppLinkActionBuilder {
       String name = inputArtifact.getFilename();
       boolean inputIsWholeArchive = !isRuntimeLinkerInput && needWholeArchive;
       if (CppFileTypes.SHARED_LIBRARY.matches(name)) {
+        // Use normal shared library resolution rules for shared libraries.
         String libName = name.replaceAll("(^lib|\\.(so|dylib)$)", "");
         librariesToLink.addValue(new LibraryToLinkValue("-l" + libName, inputIsWholeArchive));
+      } else if (CppFileTypes.VERSIONED_SHARED_LIBRARY.matches(name)) {
+        // Versioned shared libraries require the exact library filename, e.g.:
+        // -lfoo -> libfoo.so
+        // -l:libfoo.so.1 -> libfoo.so.1
+        librariesToLink.addValue(new LibraryToLinkValue("-l:" + name, inputIsWholeArchive));
       } else {
         // Interface shared objects have a non-standard extension
         // that the linker won't be able to find.  So use the