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From: Po-Hsu Lin <po-hsu.lin@canonical.com>
To: linux-fscrypt@vger.kernel.org
Cc: po-hsu.lin@canonical.com
Subject: [PATCH] Makefile: improve the cc-option compatibility
Date: Thu, 30 Jul 2020 17:35:20 +0800
Message-ID: <20200730093520.26905-1-po-hsu.lin@canonical.com> (raw)

The build on Ubuntu Xenial with GCC 5.4.0 will fail with:
    cc: error: unrecognized command line option ‘-Wimplicit-fallthrough’

This unsupported flag is not skipped as expected.

It is because of the /bin/sh shell on Ubuntu, DASH, which does not
support this &> redirection. Use 2>&1 to solve this problem.

Signed-off-by: Po-Hsu Lin <po-hsu.lin@canonical.com>
---
 Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index 7d7247c..a4ce55a 100644
--- a/Makefile
+++ b/Makefile
@@ -27,7 +27,7 @@
 #
 ##############################################################################
 
-cc-option = $(shell if $(CC) $(1) -c -x c /dev/null -o /dev/null &>/dev/null; \
+cc-option = $(shell if $(CC) $(1) -c -x c /dev/null -o /dev/null > /dev/null 2>&1; \
 	      then echo $(1); fi)
 
 CFLAGS ?= -O2 -Wall -Wundef					\
-- 
2.25.1


             reply index

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-30  9:35 Po-Hsu Lin [this message]
2020-07-30 13:21 ` Po-Hsu Lin
2020-08-01 18:12   ` Eric Biggers
2020-08-03  3:09     ` Po-Hsu Lin

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