Assume toolchain supportsDynamicLinker from presence of "dynamic_linking_mode" feature

Toolchains no longer have to provide linking_mode_flags { mode: DYNAMIC } to
state that they support dynamic linking mode. It is enough to provide a feature.

This is part of ongoing work to get rid of linking_mode_flags from the
CROSSTOOL.

This is rollforward of https://github.com/bazelbuild/bazel/commit/3dab964407a2f1e12feb439d8507079bc06cb769.

RELNOTES: None.
PiperOrigin-RevId: 190059334

1 files changed, 5 insertions, 1 deletions

diff --git a/src/main/java/com/google/devtools/build/lib/rules/cpp/CppToolchainInfo.java b/src/main/java/com/google/devtools/build/lib/rules/cpp/CppToolchainInfo.java
index 52bbd59450..03a9f9d674 100644
--- a/src/main/java/com/google/devtools/build/lib/rules/cpp/CppToolchainInfo.java
+++ b/src/main/java/com/google/devtools/build/lib/rules/cpp/CppToolchainInfo.java
@@ -320,7 +320,11 @@ public final class CppToolchainInfo {
     this.supportsFission = supportsFission;
     this.supportsStartEndLib = supportsStartEndLib;
     this.supportsEmbeddedRuntimes = supportsEmbeddedRuntimes;
-    this.supportsDynamicLinker = supportsDynamicLinker;
+    this.supportsDynamicLinker =
+        supportsDynamicLinker
+            || toolchainFeatures
+                .getActivatableNames()
+                .contains(CppRuleClasses.DYNAMIC_LINKING_MODE);
     this.supportsInterfaceSharedObjects = supportsInterfaceSharedObjects;
     this.supportsGoldLinker = supportsGoldLinker;
     this.toolchainNeedsPic = toolchainNeedsPic;