Add informational message to help with updation of VNDK abi references.

Bug: 64267858

Test: create reference dump for libjpeg; add exported function to libjpeg;
      m -j libjpeg.vendor, build fails with helpful message.

Test: create reference dump for libjpeg; add exported function to libjpeg;
      m -j libjpeg.vendor dist DIST_DIR=dist, build fails with helpful message.

Merged-In: Iae25374fe937a0cbe8a8ddf9e23c3bc1f62bbb2a
Change-Id: Iae25374fe937a0cbe8a8ddf9e23c3bc1f62bbb2a
(cherry picked from commit d8b70a39d12bbb5632811de5f3cb25b4456e49e1)
(cherry picked from commit 301aa8a8dcb0a92e96ffbf1aa2da3ca49ce2bda9)
diff --git a/cc/builder.go b/cc/builder.go
index 59a8cc8..43bd61f 100644
--- a/cc/builder.go
+++ b/cc/builder.go
@@ -200,10 +200,12 @@
 
 			commandStr := "($sAbiDiffer $allowFlags -lib $libName -arch $arch -check-all-apis -o ${out} -new $in -old $referenceDump)"
 			distDir := config.ProductVariables.DistDir
+			commandStr += " || (echo ' ---- Please update abi references by running platform/development/vndk/tools/header-checker/utils/create_reference_dumps.py -l ${libName} ----'"
 			if distDir != nil && *distDir != "" {
 				distAbiDiffDir := *distDir + "/abidiffs/"
-				commandStr += "  || (mkdir -p " + distAbiDiffDir + " && cp ${out} " + distAbiDiffDir + " && exit 1)"
+				commandStr += " && (mkdir -p " + distAbiDiffDir + " && cp ${out} " + distAbiDiffDir + ")"
 			}
+			commandStr += " && exit 1)"
 			return blueprint.RuleParams{
 				Command:     commandStr,
 				CommandDeps: []string{"$sAbiDiffer"},
@@ -738,7 +740,7 @@
 		Implicit:    referenceDump,
 		Args: map[string]string{
 			"referenceDump": referenceDump.String(),
-			"libName":       baseName,
+			"libName":       baseName[0:(len(baseName) - len(filepath.Ext(baseName)))],
 			"arch":          ctx.Arch().ArchType.Name,
 			"allowFlags":    strings.Join(localAbiCheckAllowFlags, " "),
 		},