package/opencv/0001-core-fix-x86-PIC-code-compilation.patch

   1 From ea50be0529c248961e1b66293f8a9e4b807294a6 Mon Sep 17 00:00:00 2001
   2 From: Samuel Martin <s.martin49@gmail.com>
   3 Date: Sun, 12 Oct 2014 10:17:23 +0200
   4 Subject: [PATCH] core: fix x86 PIC code compilation
   5
   6 This bug was triggered by Buildroot autobuilders [1,2], causing this
   7 kind of failures [3,4]:
   8
   9   [ 14%] Building CXX object modules/core/CMakeFiles/opencv_core.dir/src/system.cpp.o
  10   /home/test/autobuild/instance-0/output/build/opencv-2.4.10/modules/core/src/system.cpp: In function '(static initializers for /home/test/autobuild/instance-0/output/build/opencv-2.4.10/modules/core/src/system.cpp)':
  11   /home/test/autobuild/instance-0/output/build/opencv-2.4.10/modules/core/src/system.cpp:280:10: error: inconsistent operand constraints in an 'asm'
  12   make[3]: *** [modules/core/CMakeFiles/opencv_core.dir/src/system.cpp.o] Error 1
  13
  14 [1] http://buildroot.org/
  15 [2] http://autobuild.buildroot.org/
  16 [3] http://autobuild.buildroot.org/?reason=opencv-2.4.10
  17 [4] http://autobuild.buildroot.org/results/483/4838285b25d6293a5cf0bb9eadd5040a7c75d766/build-end.log
  18
  19 Signed-off-by: Samuel Martin <s.martin49@gmail.com>
  20 ---
  21  modules/core/src/system.cpp | 5 ++++-
  22  1 file changed, 4 insertions(+), 1 deletion(-)
  23
  24 diff --git a/modules/core/src/system.cpp b/modules/core/src/system.cpp
  25 index 5a970d5..e9ffdc7 100644
  26 --- a/modules/core/src/system.cpp
  27 +++ b/modules/core/src/system.cpp
  28 @@ -267,14 +267,17 @@ struct HWFeatures
  29           : "cc"
  30          );
  31          #else
  32 +        // We need to preserve ebx since we are compiling PIC code.
  33 +        // This means we cannot use "=b" for the 2nd output register.
  34          asm volatile
  35          (
  36           "pushl %%ebx\n\t"
  37           "movl $7,%%eax\n\t"
  38           "movl $0,%%ecx\n\t"
  39           "cpuid\n\t"
  40 +         "movl %%ebx,%1\n\t"
  41           "popl %%ebx\n\t"
  42 -         : "=a"(cpuid_data[0]), "=b"(cpuid_data[1]), "=c"(cpuid_data[2]), "=d"(cpuid_data[3])
  43 +         : "=a"(cpuid_data[0]), "=r"(cpuid_data[1]), "=c"(cpuid_data[2]), "=d"(cpuid_data[3])
  44           :
  45           : "cc"
  46          );
  47 --
  48 2.1.2
  49