Merge pull request #2237 from marxin/gcda-to-gitignore

Add GCC PGO data files to .gitignore.
diff --git a/examples/streaming_compression.c b/examples/streaming_compression.c
index f0f1065..045437f 100644
--- a/examples/streaming_compression.c
+++ b/examples/streaming_compression.c
@@ -39,6 +39,7 @@
      */
     CHECK_ZSTD( ZSTD_CCtx_setParameter(cctx, ZSTD_c_compressionLevel, cLevel) );
     CHECK_ZSTD( ZSTD_CCtx_setParameter(cctx, ZSTD_c_checksumFlag, 1) );
+    ZSTD_CCtx_setParameter(cctx, ZSTD_c_nbWorkers, 4);
 
     /* This loop read from the input file, compresses that entire chunk,
      * and writes all output produced to the output file.
diff --git a/programs/Makefile b/programs/Makefile
index 418ad4e..6cb4a57 100644
--- a/programs/Makefile
+++ b/programs/Makefile
@@ -227,7 +227,7 @@
 	$(CC) $(FLAGS) $^ -o $@$(EXT) $(LDFLAGS)
 
 
-## zstd-pgo: zstd executable optimized with pgo. `gcc` only.
+## zstd-pgo: zstd executable optimized with PGO.
 zstd-pgo :
 	$(MAKE) clean
 	$(MAKE) zstd MOREFLAGS=-fprofile-generate