linux-kernel - [PATCH] kbuild: fix 'Broken pipe' message for AR=gcc-ar

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Date:   Mon, 24 Oct 2022 04:52:57 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     linux-kbuild@...r.kernel.org
Cc:     Masahiro Yamada <masahiroy@...nel.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nicolas Schier <nicolas@...sle.eu>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] kbuild: fix 'Broken pipe' message for AR=gcc-ar

Since commit 321648455061 ("kbuild: use obj-y instead extra-y for
objects placed at the head"), 'make AR=gcc-ar' shows the following
message:

  /usr/bin/ar terminated with signal 13 [Broken pipe]

The resulting vmlinux is correct, but it is better to silence this.

'head -n1' exits after reading the first line, so the pipe is closed.

Use 'sed -n 1p' to eat the stream till the end.

Fixes: 321648455061 ("kbuild: use obj-y instead extra-y for objects placed at the head")
Reported-by: Jiri Slaby <jirislaby@...nel.org>
Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
---

 Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index f41ec8c8426b..0e42a7982826 100644
--- a/Makefile
+++ b/Makefile
@@ -1218,7 +1218,7 @@ quiet_cmd_ar_vmlinux.a = AR      $@
       cmd_ar_vmlinux.a = \
 	rm -f $@; \
 	$(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \
-	$(AR) mPiT $$($(AR) t $@ | head -n1) $@ $$($(AR) t $@ | grep -F --file=$(srctree)/scripts/head-object-list.txt)
+	$(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F --file=$(srctree)/scripts/head-object-list.txt)
 
 targets += vmlinux.a
 vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt autoksyms_recursive FORCE
-- 
2.34.1