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armv7-a : For thumb inter-working we require an architecture which supports blx
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AJ ONeal  
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 More options Dec 15 2010, 8:04 pm
From: AJ ONeal <coola...@gmail.com>
Date: Wed, 15 Dec 2010 18:04:58 -0700
Local: Wed, Dec 15 2010 8:04 pm
Subject: armv7-a : For thumb inter-working we require an architecture which supports blx
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Isn't scons supposed to auto-guess my architecture when not cross-compiling?

touch foo.cc
g++ -march=armv7-a -mtune=cortex-a8 -mfpu=vfp -dM -E foo.cc || grep -i ARM
#define __ARMEL__ 1
#define __arm__ 1
#define __ARM_ARCH_7A__ 1
#define __ARM_EABI__ 1

svn checkout http://v8.googlecode.com/svn/trunk/ v8-read-only
cd v8-read-only
scons mode=debug snapshot=on library=shared

g++ -o obj/debug/arm/macro-assembler-arm.os -c -Wall -Werror -W
-Wno-unused-parameter -Wnon-virtual-dtor -pedantic -g -O0 -ansi -fno-rtti
-fno-exceptions -fvisibility=hidden -Wall -Werror -W -Wno-unused-parameter
-Wnon-virtual-dtor -pedantic -g -O0 -ansi -fPIC -DV8_TARGET_ARCH_ARM
-DENABLE_DISASSEMBLER -DDEBUG -DV8_SHARED -DENABLE_VMSTATE_TRACKING
-DENABLE_LOGGING_AND_PROFILING -DV8_ENABLE_CHECKS -DENABLE_DEBUGGER_SUPPORT
-Isrc src/arm/macro-assembler-arm.cc
src/arm/macro-assembler-arm.cc:61:3: error: #error "For thumb inter-working
we require an architecture which supports blx"

AJ ONeal


 
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Erik Corry  
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 More options Dec 17 2010, 4:33 am
From: Erik Corry <erik.co...@gmail.com>
Date: Fri, 17 Dec 2010 10:33:03 +0100
Local: Fri, Dec 17 2010 4:33 am
Subject: Re: [v8-users] armv7-a : For thumb inter-working we require an architecture which supports blx
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16. dec. 2010 02.04 skrev AJ ONeal <coola...@gmail.com>:

> Isn't scons supposed to auto-guess my architecture when not cross-compiling?

Just because you are compiling on an ARMv7, it doesn't mean you want
to build a VM that doesn't work on an older CPU.

I think
export CFLAGS=-march=armv7-a
should work for you.  If you don't care about CPUs without VFP then
you should use
export CFLAGS=-march=armv7-a -DCAN_USE_VFP_INSTRUCTIONS=1

--
Erik Corry, Software Engineer
Google Denmark ApS - Frederiksborggade 20B, 1 sal,
1360 København K - Denmark - CVR nr. 28 86 69 84

 
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AJ ONeal  
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 More options Dec 17 2010, 11:32 am
From: AJ ONeal <coola...@gmail.com>
Date: Fri, 17 Dec 2010 09:32:45 -0700
Local: Fri, Dec 17 2010 11:32 am
Subject: Re: [v8-users] armv7-a : For thumb inter-working we require an architecture which supports blx
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Certainly it shouldn't default to build for a version of ARM that is known
to not work.

Shouldn't it at least auto-guess armv5te?
Isn't that the oldest generation of ARM that will build?

AJ ONeal


 
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Rodolph Perfetta  
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 More options Dec 17 2010, 2:57 pm
From: Rodolph Perfetta <rodolph.perfe...@gmail.com>
Date: Fri, 17 Dec 2010 19:57:17 +0000
Local: Fri, Dec 17 2010 2:57 pm
Subject: Re: [v8-users] armv7-a : For thumb inter-working we require an architecture which supports blx
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The minimun requirements are: armv4 without interworking or armv5t with
interworking.

The build system will default to whatever your compiler defaults are, which
here seem to be armv4t with interworking hence the error.

as Erik explained you can manually add some compiler options such as
"-march=armv7-a -mfpu=vfp -mfloat-abi=vfp" if you want the the latest ISA
and floating point support. Alternatively you could disable interworking
(-mno-thumb-interwork but I am not 100% sure on this one).

Cheers,
Rodolph.

On 17 December 2010 16:32, AJ ONeal <coola...@gmail.com> wrote:


 
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AJ ONeal  
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 More options Dec 17 2010, 3:02 pm
From: AJ ONeal <coola...@gmail.com>
Date: Fri, 17 Dec 2010 13:02:07 -0700
Local: Fri, Dec 17 2010 3:02 pm
Subject: Re: [v8-users] armv7-a : For thumb inter-working we require an architecture which supports blx
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Thanks, forgive my ignorance.

How do I go about setting my compiler (gcc) defaults?

AJ ONeal

On Fri, Dec 17, 2010 at 12:57 PM, Rodolph Perfetta <


 
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AJ ONeal  
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 More options Dec 17 2010, 3:03 pm
From: AJ ONeal <coola...@gmail.com>
Date: Fri, 17 Dec 2010 13:03:28 -0700
Local: Fri, Dec 17 2010 3:03 pm
Subject: Re: [v8-users] armv7-a : For thumb inter-working we require an architecture which supports blx
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As I understand it scons doesn't read from the environment variables, hence
the need to specifically import them, correct?

AJ ONeal


 
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pikpik  
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 More options Dec 17 2010, 3:29 pm
From: pikpik <pikpik.1...@gmail.com>
Date: Fri, 17 Dec 2010 12:29:09 -0800 (PST)
Local: Fri, Dec 17 2010 3:29 pm
Subject: Re: armv7-a : For thumb inter-working we require an architecture which supports blx
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Hi,

On Dec 17, 3:03 pm, AJ ONeal <coola...@gmail.com> wrote:

> As I understand it scons doesn't read from the environment variables, hence
> the need to specifically import them, correct?

I think SCons does read from the environment variables. I had trouble
with this for quite some time, but it does work.

To see if it will take your variables, you could try the following
script.

scons-test.sh:

CC=orange \
CXX=apple \
scons $@

Save, "chmod u+x scons-test.sh," run, and look in SCons' output for
"orange" or "apple."

I hope this helps,
pikpik


 
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