From: Omar Sandoval <osandov@fb.com>
Date: Wed, 13 Feb 2019 19:42:02 +0000 (-0800)
Subject: src: check if header exists with -E
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=01ae9573f22be170d49b3fb6039228790166e5fd;p=users%2Fsagi%2Fblktests.git

src: check if header exists with -E

The current HAVE_C_HEADER function creates a -.o file. We don't need to
compile, just run the C preprocessor, so use -E instead of -c.

Signed-off-by: Omar Sandoval <osandov@fb.com>
---

diff --git a/src/Makefile b/src/Makefile
index cb35497..917d6f4 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -1,6 +1,6 @@
-HAVE_C_HEADER = $(shell if echo "\#include <$(1)>" |			\
-		  $(CC) -x c -c - 2>/dev/null; then echo "$(2)";	\
-		  else echo "$(3)"; fi)
+HAVE_C_HEADER = $(shell if echo "\#include <$(1)>" |		\
+		$(CC) -E - > /dev/null 2>&1; then echo "$(2)";	\
+		else echo "$(3)"; fi)
 
 C_TARGETS := \
 	loblksize \