Make the error message when a file is not found in the profile zip more indicative of the probable cause of the error.

RELNOTES: None.
PiperOrigin-RevId: 158286091

1 files changed, 7 insertions, 2 deletions

diff --git a/src/main/java/com/google/devtools/build/lib/rules/cpp/FdoSupport.java b/src/main/java/com/google/devtools/build/lib/rules/cpp/FdoSupport.java
index eddb0452ed..9bf74e93c5 100644
--- a/src/main/java/com/google/devtools/build/lib/rules/cpp/FdoSupport.java
+++ b/src/main/java/com/google/devtools/build/lib/rules/cpp/FdoSupport.java
@@ -610,7 +610,9 @@ public class FdoSupport {
                 getGcdaArtifactsForGcdaPath(fdoSupportProvider, importedFile);
             if (gcdaArtifact == null) {
               ruleContext.ruleError(String.format(
-                  ".gcda file %s is not in the FDO zip (referenced by source file %s)",
+                  ".gcda file %s is not in the FDO zip (referenced by source file %s). Check if "
+                  + "your profile is generated from the same sources you are building the "
+                  + "optimized binary from",
                   importedFile, sourceName));
             } else {
               auxiliaryInputs.add(gcdaArtifact);
@@ -622,7 +624,10 @@ public class FdoSupport {
               auxiliaryInputs.add(importedArtifact);
             } else {
               ruleContext.ruleError(String.format(
-                  "cannot find source file '%s' referenced from '%s'", importedFile, objectName));
+                  "cannot find source file '%s' referenced from '%s' by LIPO inclusion. Check if "
+                  + "your profile is generated from the same sources you are building the "
+                  + "optimized binary from",
+                  importedFile, objectName));
             }
           }
         }