use __OPTIMIZE__ macro to determine debug vs release.

use __OPTIMIZE__ macro to determine debug vs release.

Debug builds of x86 gcc/clang can run out of register.
Previously NDEBUG or _DEBUG was used to detect a debug build.
But those macros are not set by gentoo builds.
This CL switches to the compiler predefine __OPTIMIZE__ which is
built into clang and gcc.

BUG=libyuv:602
TEST=untested
R=wangcheng@google.com

Committed: https://chromium.googlesource.com/libyuv/libyuv/+/c2073823b4d69652580691b73b01ed87619e20be

[wangcheng, 2016-10-25 00:26:47]

wangcheng@google.com changed reviewers:
+ wangcheng@google.com

[wangcheng, 2016-10-25 00:26:48]

https://codereview.chromium.org/2451503002/diff/1/include/libyuv/row.h
File include/libyuv/row.h (right):

https://codereview.chromium.org/2451503002/diff/1/include/libyuv/row.h#newcod...
include/libyuv/row.h:494: #define OMITFP
__attribute__((optimize("omit-frame-pointer")))
might affect the expectation of build with -fno-omit-frame-pointer -O2, but
there seems no better solution.

[wangcheng, 2016-10-25 00:39:33]

lgtm

[fbarchard1, 2016-10-25 01:02:50]

Description was changed from

==========
use __OPTIMIZE__ macro to determine debug vs release.

Debug builds of x86 gcc/clang can run out of register.
Previously NDEBUG or _DEBUG was used to detect a debug build.
But those macros are not set by gentoo builds.
This CL switches to the compiler predefine __OPTIMIZE__ which is
built into clang and gcc.

BUG=libyuv:602
TEST=untested
==========

to

==========
use __OPTIMIZE__ macro to determine debug vs release.

Debug builds of x86 gcc/clang can run out of register.
Previously NDEBUG or _DEBUG was used to detect a debug build.
But those macros are not set by gentoo builds.
This CL switches to the compiler predefine __OPTIMIZE__ which is
built into clang and gcc.

BUG=libyuv:602
TEST=untested
R=wangcheng@google.com

Committed:
https://chromium.googlesource.com/libyuv/libyuv/+/c2073823b4d69652580691b73b0...
==========

[fbarchard1, 2016-10-25 01:02:51]

Committed patchset #2 (id:20001) manually as
c2073823b4d69652580691b73b01ed87619e20be (presubmit successful).