opencv: disable broken Intel FP16 detectionpyro-nfvaccess

With opencv-3.2, the configuration detects if the target supports
half-precision floating-point format. This fails to compile for some
Intel targets such as skylake with an error such as:
   error: '_mm_cvtph_ps' was not declared in this scope

The configuration used to work in opencv-3.1 so revert two commits to
drop the FP16 detection even though it may make opencv slower.
The only change in the configure log is:
   - FP16: Compiler support is available
   + FP16: Compiler support is not available

The patch should be dropped when a newer version of opencv that includes commit:
   https://github.com/opencv/opencv/commit/e5d9b608c47d54e43496041595025fa282fa9de5
is available. Backporting that fix was complicated.

Signed-off-by: Randy MacLeod <Randy.MacLeod@windriver.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>

1 files changed, 27 insertions, 0 deletions

diff --git a/meta-oe/recipes-support/opencv/opencv/0001-Revert-cuda-fix-fp16-compilation.patch b/meta-oe/recipes-support/opencv/opencv/0001-Revert-cuda-fix-fp16-compilation.patch
new file mode 100644
index 000000000..507d7968a
--- /dev/null
+++ b/meta-oe/recipes-support/opencv/opencv/0001-Revert-cuda-fix-fp16-compilation.patch
@@ -0,0 +1,27 @@
+From 69f9707678190f6a0948a547dce948251f972676 Mon Sep 17 00:00:00 2001
+From: Randy MacLeod <Randy.MacLeod@windriver.com>
+Date: Wed, 26 Apr 2017 14:57:30 -0400
+Subject: [PATCH 1/2] Revert "cuda: fix fp16 compilation"
+
+This reverts commit 12e00827be40576b686ea4438a6e6ef85208743d.
+---
+ modules/core/include/opencv2/core/cvdef.h | 3 +--
+ 1 file changed, 1 insertion(+), 2 deletions(-)
+
+diff --git a/modules/core/include/opencv2/core/cvdef.h b/modules/core/include/opencv2/core/cvdef.h
+index 699b166..efc24ca 100644
+--- a/modules/core/include/opencv2/core/cvdef.h
++++ b/modules/core/include/opencv2/core/cvdef.h
+@@ -303,8 +303,7 @@ enum CpuFeatures {
+ #define CV_2PI 6.283185307179586476925286766559
+ #define CV_LOG2 0.69314718055994530941723212145818
+ 
+-#if defined __ARM_FP16_FORMAT_IEEE \
+-    && !defined __CUDACC__
++#if defined (__ARM_FP16_FORMAT_IEEE)
+ #  define CV_FP16_TYPE 1
+ #else
+ #  define CV_FP16_TYPE 0
+-- 
+2.9.3
+