ARM: Support hardfloat in SCons build and make it a build time setting

ARM: Support hardfloat in SCons build and make it a build time setting

Add option armeabi to the SCons build for selecting the floating point variant to use. Also add externally defined CCFLAGS environment for all targets. Run test.py with option -S armeabi=hardfloat to test with hardfloat enabled.

Make selecting hardfloat EABI variant a build-time option instead of a runtime option.

Add a simple check of the EABI variant during V8 initialization to exit if the compilation was not configured correctly. The reason for this is that GCC does not provide a compile time symbol defining the EABI variant. This check is not fool-proof as it cannot check the compilation configuration used for the snapshot if any.

R=karlklose@chromium.org, erik.corry@gmail.com

BUG=none
TEST=none

Committed: http://code.google.com/p/v8/source/detail?r=7715

[Karl Klose, 2011-04-29 06:25:46]

LGTM.

http://codereview.chromium.org/6905098/diff/1/SConstruct
File SConstruct (right):

http://codereview.chromium.org/6905098/diff/1/SConstruct#newcode302
SConstruct:302: # This is to silence warnings about ABI changes thes Some
versions of the
that some?

http://codereview.chromium.org/6905098/diff/1/src/platform-linux.cc
File src/platform-linux.cc (right):

http://codereview.chromium.org/6905098/diff/1/src/platform-linux.cc#newcode202
src/platform-linux.cc:202: // Simple helper function to detect whether the C
code is compiler with
compiler -> compiled

[Søren Thygesen Gjesse, 2011-04-29 06:55:13]

http://codereview.chromium.org/6905098/diff/1/SConstruct
File SConstruct (right):

http://codereview.chromium.org/6905098/diff/1/SConstruct#newcode302
SConstruct:302: # This is to silence warnings about ABI changes thes Some
versions of the
On 2011/04/29 06:25:46, Karl Klose wrote:
> that some?

Done.

http://codereview.chromium.org/6905098/diff/1/src/platform-linux.cc
File src/platform-linux.cc (right):

http://codereview.chromium.org/6905098/diff/1/src/platform-linux.cc#newcode202
src/platform-linux.cc:202: // Simple helper function to detect whether the C
code is compiler with
On 2011/04/29 06:25:46, Karl Klose wrote:
> compiler -> compiled

Done.