Commit 20d78037 authored Feb 25, 2016 by Vineet Gupta

ARC: build: Better way to detect ISA compatible toolchain



ARC architecture has 2 instruction sets: ARCompact/ARCv2.
While same gcc supports compiling for either (using appropriate toggles),
we can't use the same toolchain to build kernel because libgcc needs
to be unique and the toolchian (uClibc based) is not multilibed.

uClibc toolchain is convenient since it allows all userspace and
kernel to be built with a single install for an ISA.

This however means 2 gnu installs (with same triplet prefix) are needed
for building for 2 ISA and need to be in PATH.
As developers we keep switching the builds, but would occassionally fail
to update the PATH leading to usage of wrong tools. And this would only
show up at the end of kernel build when linking incompatible libgcc.

So the initial solution was to have gcc define a special preprocessor macro
DEFAULT_CPU_xxx which is unique for default toolchain configuration.
Claudiu proposed using grep for an existing preprocessor macro which is
again uniquely defined per ISA.

Cc: Michal Marek <mmarek@suse.cz>
Suggested-by: Claudiu Zissulescu <claziss@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>

parent 7cab91b8

arch/arc/Makefile

+14 −0

Original line number	Diff line number	Diff line
		@@ -22,6 +22,20 @@ cflags-y += -fno-common -pipe -fno-builtin -D__linux__
		cflags-$(CONFIG_ISA_ARCOMPACT) += -mA7
		cflags-$(CONFIG_ISA_ARCV2) += -mcpu=archs

		is_700 = $(shell $(CC) -dM -E - < /dev/null \| grep -q "ARC700" && echo 1 \|\| echo 0)

		ifdef CONFIG_ISA_ARCOMPACT
		ifeq ($(is_700), 0)
		$(error Toolchain not configured for ARCompact builds)
		endif
		endif

		ifdef CONFIG_ISA_ARCV2
		ifeq ($(is_700), 1)
		$(error Toolchain not configured for ARCv2 builds)
		endif
		endif

		ifdef CONFIG_ARC_CURR_IN_REG
		# For a global register defintion, make sure it gets passed to every file
		# We had a customer reported bug where some code built in kernel was NOT using

arch/arc/include/asm/arcregs.h

+0 −6

Original line number	Diff line number	Diff line
		@@ -381,12 +381,6 @@ static inline int is_isa_arcompact(void)
		return IS_ENABLED(CONFIG_ISA_ARCOMPACT);
		}

		#if defined(CONFIG_ISA_ARCOMPACT) && !defined(_CPU_DEFAULT_A7)
		#error "Toolchain not configured for ARCompact builds"
		#elif defined(CONFIG_ISA_ARCV2) && !defined(_CPU_DEFAULT_HS)
		#error "Toolchain not configured for ARCv2 builds"
		#endif

		#endif /* __ASEMBLY__ */

		#endif /* _ASM_ARC_ARCREGS_H */

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