linux-kernel - [PATCH] sh: Also try passing -m4-nofpu for SH2A builds

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Date:	Tue,  8 Jul 2014 23:32:24 +0200
From:	Geert Uytterhoeven <geert+renesas@...der.be>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Guenter Roeck <linux@...ck-us.net>,
	Tony Breeds <tony@...eyournoodle.com>,
	Alexei Starovoitov <ast@...mgrid.com>,
	Fengguang Wu <fengguang.wu@...el.com>,
	Daniel Borkmann <dborkman@...hat.com>,
	Magnus Damm <magnus.damm@...il.com>, linux-sh@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Geert Uytterhoeven <geert+renesas@...der.be>
Subject: [PATCH] sh: Also try passing -m4-nofpu for SH2A builds

When compiling a SH2A kernel (e.g. se7206_defconfig or rsk7203_defconfig)
using sh4-linux-gcc, linking fails with:

net/built-in.o: In function `__sk_run_filter':
net/core/filter.c:566: undefined reference to `__fpscr_values'
net/core/filter.c:269: undefined reference to `__fpscr_values'
net/core/filter.c:269: undefined reference to `__fpscr_values'
net/core/filter.c:269: undefined reference to `__fpscr_values'
net/core/filter.c:269: undefined reference to `__fpscr_values'
net/built-in.o:net/core/filter.c:580: more undefined references to `__fpscr_values' follow

This happens because sh4-linux-gcc doesn't support the "-m2a-nofpu", which
is thus filtered out by "$(call cc-option, ...)".

As compiling using sh4-linux-gcc is useful for compile coverage, also try
passing "-m4-nofpu" (which is presumably filtered out when using a real
sh2a-linux toolchain) to disable the generation of FPU instructions and
references to __fpscr_values[].

Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
---
 arch/sh/Makefile | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/sh/Makefile b/arch/sh/Makefile
index d4d16e4be07c..bf5b3f5f4962 100644
--- a/arch/sh/Makefile
+++ b/arch/sh/Makefile
@@ -32,7 +32,8 @@ endif
 
 cflags-$(CONFIG_CPU_SH2)		:= $(call cc-option,-m2,)
 cflags-$(CONFIG_CPU_SH2A)		+= $(call cc-option,-m2a,) \
-					   $(call cc-option,-m2a-nofpu,)
+					   $(call cc-option,-m2a-nofpu,) \
+					   $(call cc-option,-m4-nofpu,)
 cflags-$(CONFIG_CPU_SH3)		:= $(call cc-option,-m3,)
 cflags-$(CONFIG_CPU_SH4)		:= $(call cc-option,-m4,) \
 	$(call cc-option,-mno-implicit-fp,-m4-nofpu)
-- 
1.9.1

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