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OpenCL SDK
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How to build for FreeBSD 13.1? #55

Closed rajhlinux closed 2 years ago

rajhlinux commented 2 years ago

I get this error:

Unix Makefiles

  does not support platform specification, but platform

    x64

  was specified.
bashbaug commented 2 years ago

Hi, can you please include the command lines you are using to build on FreeBSD?

It looks like you are specifying a platform name with -A when you are creating build files via CMake but this is not supported for the Unix Makefile generator.

Here's what I do - should be all that is required for most Unix-like systems. Feel free to use another directory other than "build" if you would prefer, and start in the OpenCL-SDK directory you've cloned that has up-to-date submodules:

$ mkdir build
$ cd build
$ cmake ..

After the build files are generated and all dependencies have been fetched, simply build using "make".

rajhlinux commented 2 years ago

Thanks for your reply, yes I was using the "-A" option.

I get the follow error after doing:

$ mkdir build
$ cd build
$ cmake ..

In the path: /usr/home/user/OpenCL-SDK/build/ 

$ cmake ..

-- The C compiler identification is Clang 13.0.0
-- The CXX compiler identification is Clang 13.0.0
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /usr/bin/cc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- No build type selected, default to Release
CMake Error at CMakeLists.txt:41 (add_subdirectory):
  The source directory

    /home/user/OpenCL-SDK/external/OpenCL-Headers

  does not contain a CMakeLists.txt file.

CMake Error at CMakeLists.txt:42 (add_subdirectory):
  The source directory

    /home/user/OpenCL-SDK/external/OpenCL-ICD-Loader

  does not contain a CMakeLists.txt file.

CMake Error at CMakeLists.txt:43 (add_subdirectory):
  The source directory

    /home/user/OpenCL-SDK/external/OpenCL-CLHPP

  does not contain a CMakeLists.txt file.

-- cargs (https://github.com/likle/cargs) not found. To self-host, set cargs_INCLUDE_PATH and cargs_LIBRARY to point to the headers and library respectively adding '-D cargs_INCLUDE_PATH=/path/to/cargs/include/dir -D cargs_LIBRARY/path/to/cargs/libcargs' to the cmake command. (missing: cargs_INCLUDE_PATH cargs_LIBRARY) 
-- Fetching cargs.
-- Adding cargs subproject: /home/user/OpenCL-SDK/build/_deps/cargs-external-src
-- Found TCLAP: /usr/local/include  
-- Stb (https://github.com/nothings/stb) not found. To self-host, set Stb_INCLUDE_PATH to point to the headers adding '-D Stb_INCLUDE_PATH=/path/to/stb' to the cmake command. (missing: Stb_INCLUDE_PATH) 
-- Fetching Stb.
-- Found Stb: /home/user/OpenCL-SDK/build/_deps/stb-external-src  
CMake Warning (dev) at /usr/local/share/cmake/Modules/FindOpenGL.cmake:315 (message):
  Policy CMP0072 is not set: FindOpenGL prefers GLVND by default when
  available.  Run "cmake --help-policy CMP0072" for policy details.  Use the
  cmake_policy command to set the policy and suppress this warning.

  FindOpenGL found both a legacy GL library:

    OPENGL_gl_LIBRARY: /usr/local/lib/libGL.so

  and GLVND libraries for OpenGL and GLX:

    OPENGL_opengl_LIBRARY: /usr/local/lib/libOpenGL.so
    OPENGL_glx_LIBRARY: /usr/local/lib/libGLX.so

  OpenGL_GL_PREFERENCE has not been set to "GLVND" or "LEGACY", so for
  compatibility with CMake 3.10 and below the legacy GL library will be used.
Call Stack (most recent call first):
  cmake/Dependencies/OpenGL/OpenGL.cmake:1 (find_package)
  cmake/Dependencies.cmake:10 (include)
  CMakeLists.txt:49 (include)
This warning is for project developers.  Use -Wno-dev to suppress it.

-- Found OpenGL: /usr/local/lib/libOpenGL.so   
-- Found GLEW: /usr/local/include (found version "2.2.0") 
-- Found Freetype: /usr/local/lib/libfreetype.so (found version "2.12.1") 
-- Performing Test COMPILER_HAS_HIDDEN_VISIBILITY
-- Performing Test COMPILER_HAS_HIDDEN_VISIBILITY - Success
-- Performing Test COMPILER_HAS_HIDDEN_INLINE_VISIBILITY
-- Performing Test COMPILER_HAS_HIDDEN_INLINE_VISIBILITY - Success
-- Performing Test COMPILER_HAS_DEPRECATED_ATTR
-- Performing Test COMPILER_HAS_DEPRECATED_ATTR - Success
-- Looking for sin in m
-- Looking for sin in m - found
-- Configuring incomplete, errors occurred!

See also "/home/user/OpenCL-SDK/build/CMakeFiles/CMakeOutput.log".

Here is the CMakeOutput.log file:

The system is: FreeBSD - 13.1-RELEASE-p1 - amd64
Compiling the C compiler identification source file "CMakeCCompilerId.c" succeeded.
Compiler: /usr/bin/cc 
Build flags: 
Id flags:  

The output was:
0

Compilation of the C compiler identification source "CMakeCCompilerId.c" produced "a.out"

The C compiler identification is Clang, found in "/home/user/OpenCL-SDK/build/CMakeFiles/3.24.0/CompilerIdC/a.out"

Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" succeeded.
Compiler: /usr/bin/c++ 
Build flags: 
Id flags:  

The output was:
0

Compilation of the CXX compiler identification source "CMakeCXXCompilerId.cpp" produced "a.out"

The CXX compiler identification is Clang, found in "/home/user/OpenCL-SDK/build/CMakeFiles/3.24.0/CompilerIdCXX/a.out"

Detecting C compiler ABI info compiled with the following output:
Change Dir: /home/user/OpenCL-SDK/build/CMakeFiles/CMakeTmp

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#include <...> search starts here:
 /usr/lib/clang/13.0.0/include
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Thread model: posix
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    arg [-dynamic-linker] ==> ignore
    arg [/libexec/ld-elf.so.1] ==> ignore
    arg [--hash-style=both] ==> ignore
    arg [--enable-new-dtags] ==> ignore
    arg [-o] ==> ignore
    arg [cmTC_021a2] ==> ignore
    arg [/usr/lib/crt1.o] ==> obj [/usr/lib/crt1.o]
    arg [/usr/lib/crti.o] ==> obj [/usr/lib/crti.o]
    arg [/usr/lib/crtbegin.o] ==> obj [/usr/lib/crtbegin.o]
    arg [-L/usr/lib] ==> dir [/usr/lib]
    arg [CMakeFiles/cmTC_021a2.dir/CMakeCXXCompilerABI.cpp.o] ==> ignore
    arg [-lc++] ==> lib [c++]
    arg [-lm] ==> lib [m]
    arg [-lgcc] ==> lib [gcc]
    arg [--as-needed] ==> ignore
    arg [-lgcc_s] ==> lib [gcc_s]
    arg [--no-as-needed] ==> ignore
    arg [-lc] ==> lib [c]
    arg [-lgcc] ==> lib [gcc]
    arg [--as-needed] ==> ignore
    arg [-lgcc_s] ==> lib [gcc_s]
    arg [--no-as-needed] ==> ignore
    arg [/usr/lib/crtend.o] ==> obj [/usr/lib/crtend.o]
    arg [/usr/lib/crtn.o] ==> obj [/usr/lib/crtn.o]
  collapse library dir [/usr/lib] ==> [/usr/lib]
  implicit libs: [c++;m;gcc;gcc_s;c;gcc;gcc_s]
  implicit objs: [/usr/lib/crt1.o;/usr/lib/crti.o;/usr/lib/crtbegin.o;/usr/lib/crtend.o;/usr/lib/crtn.o]
  implicit dirs: [/usr/lib]
  implicit fwks: []

Performing C++ SOURCE FILE Test COMPILER_HAS_HIDDEN_VISIBILITY succeeded with the following output:
Change Dir: /home/user/OpenCL-SDK/build/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/local/bin/gmake -f Makefile cmTC_e7a98/fast && /usr/local/bin/gmake  -f CMakeFiles/cmTC_e7a98.dir/build.make CMakeFiles/cmTC_e7a98.dir/build
gmake[1]: Entering directory '/usr/home/user/OpenCL-SDK/build/CMakeFiles/CMakeTmp'
Building CXX object CMakeFiles/cmTC_e7a98.dir/src.cxx.o
/usr/bin/c++ -DCOMPILER_HAS_HIDDEN_VISIBILITY  -fvisibility=hidden -MD -MT CMakeFiles/cmTC_e7a98.dir/src.cxx.o -MF CMakeFiles/cmTC_e7a98.dir/src.cxx.o.d -o CMakeFiles/cmTC_e7a98.dir/src.cxx.o -c /home/user/OpenCL-SDK/build/CMakeFiles/CMakeTmp/src.cxx
Linking CXX executable cmTC_e7a98
/usr/local/bin/cmake -E cmake_link_script CMakeFiles/cmTC_e7a98.dir/link.txt --verbose=1
/usr/bin/c++ CMakeFiles/cmTC_e7a98.dir/src.cxx.o -o cmTC_e7a98 
gmake[1]: Leaving directory '/usr/home/user/OpenCL-SDK/build/CMakeFiles/CMakeTmp'

Source file was:
int main() { return 0; }
Performing C++ SOURCE FILE Test COMPILER_HAS_HIDDEN_INLINE_VISIBILITY succeeded with the following output:
Change Dir: /home/user/OpenCL-SDK/build/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/local/bin/gmake -f Makefile cmTC_d038e/fast && /usr/local/bin/gmake  -f CMakeFiles/cmTC_d038e.dir/build.make CMakeFiles/cmTC_d038e.dir/build
gmake[1]: Entering directory '/usr/home/user/OpenCL-SDK/build/CMakeFiles/CMakeTmp'
Building CXX object CMakeFiles/cmTC_d038e.dir/src.cxx.o
/usr/bin/c++ -DCOMPILER_HAS_HIDDEN_INLINE_VISIBILITY  -fvisibility-inlines-hidden -MD -MT CMakeFiles/cmTC_d038e.dir/src.cxx.o -MF CMakeFiles/cmTC_d038e.dir/src.cxx.o.d -o CMakeFiles/cmTC_d038e.dir/src.cxx.o -c /home/user/OpenCL-SDK/build/CMakeFiles/CMakeTmp/src.cxx
Linking CXX executable cmTC_d038e
/usr/local/bin/cmake -E cmake_link_script CMakeFiles/cmTC_d038e.dir/link.txt --verbose=1
/usr/bin/c++ CMakeFiles/cmTC_d038e.dir/src.cxx.o -o cmTC_d038e 
gmake[1]: Leaving directory '/usr/home/user/OpenCL-SDK/build/CMakeFiles/CMakeTmp'

Source file was:
int main() { return 0; }
Performing C++ SOURCE FILE Test COMPILER_HAS_DEPRECATED_ATTR succeeded with the following output:
Change Dir: /home/user/OpenCL-SDK/build/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/local/bin/gmake -f Makefile cmTC_e91ff/fast && /usr/local/bin/gmake  -f CMakeFiles/cmTC_e91ff.dir/build.make CMakeFiles/cmTC_e91ff.dir/build
gmake[1]: Entering directory '/usr/home/user/OpenCL-SDK/build/CMakeFiles/CMakeTmp'
Building CXX object CMakeFiles/cmTC_e91ff.dir/src.cxx.o
/usr/bin/c++ -DCOMPILER_HAS_DEPRECATED_ATTR   -MD -MT CMakeFiles/cmTC_e91ff.dir/src.cxx.o -MF CMakeFiles/cmTC_e91ff.dir/src.cxx.o.d -o CMakeFiles/cmTC_e91ff.dir/src.cxx.o -c /home/user/OpenCL-SDK/build/CMakeFiles/CMakeTmp/src.cxx
/home/user/OpenCL-SDK/build/CMakeFiles/CMakeTmp/src.cxx:2:25: warning: 'somefunc' is deprecated [-Wdeprecated-declarations]
    int main() { return somefunc();}
                        ^
/home/user/OpenCL-SDK/build/CMakeFiles/CMakeTmp/src.cxx:1:16: note: 'somefunc' has been explicitly marked deprecated here
__attribute__((__deprecated__)) int somefunc() { return 0; }
               ^
1 warning generated.
Linking CXX executable cmTC_e91ff
/usr/local/bin/cmake -E cmake_link_script CMakeFiles/cmTC_e91ff.dir/link.txt --verbose=1
/usr/bin/c++ CMakeFiles/cmTC_e91ff.dir/src.cxx.o -o cmTC_e91ff 
gmake[1]: Leaving directory '/usr/home/user/OpenCL-SDK/build/CMakeFiles/CMakeTmp'

Source file was:
__attribute__((__deprecated__)) int somefunc() { return 0; }
    int main() { return somefunc();}
Determining if the function sin exists in the m passed with the following output:
Change Dir: /home/user/OpenCL-SDK/build/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/local/bin/gmake -f Makefile cmTC_57336/fast && /usr/local/bin/gmake  -f CMakeFiles/cmTC_57336.dir/build.make CMakeFiles/cmTC_57336.dir/build
gmake[1]: Entering directory '/usr/home/user/OpenCL-SDK/build/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_57336.dir/CheckFunctionExists.c.o
/usr/bin/cc   -DCHECK_FUNCTION_EXISTS=sin -MD -MT CMakeFiles/cmTC_57336.dir/CheckFunctionExists.c.o -MF CMakeFiles/cmTC_57336.dir/CheckFunctionExists.c.o.d -o CMakeFiles/cmTC_57336.dir/CheckFunctionExists.c.o -c /usr/local/share/cmake/Modules/CheckFunctionExists.c
/usr/local/share/cmake/Modules/CheckFunctionExists.c:7:3: warning: incompatible redeclaration of library function 'sin' [-Wincompatible-library-redeclaration]
  CHECK_FUNCTION_EXISTS(void);
  ^
<command line>:1:31: note: expanded from here
#define CHECK_FUNCTION_EXISTS sin
                              ^
/usr/local/share/cmake/Modules/CheckFunctionExists.c:7:3: note: 'sin' is a builtin with type 'double (double)'
<command line>:1:31: note: expanded from here
#define CHECK_FUNCTION_EXISTS sin
                              ^
1 warning generated.
Linking C executable cmTC_57336
/usr/local/bin/cmake -E cmake_link_script CMakeFiles/cmTC_57336.dir/link.txt --verbose=1
/usr/bin/cc  -DCHECK_FUNCTION_EXISTS=sin CMakeFiles/cmTC_57336.dir/CheckFunctionExists.c.o -o cmTC_57336  -lm 
gmake[1]: Leaving directory '/usr/home/user/OpenCL-SDK/build/CMakeFiles/CMakeTmp'

Thanks

rajhlinux commented 2 years ago

Alright, I had to start over and did:

git clone --recursive https://github.com/KhronosGroup/OpenCL-SDK.git 

$ cd OpenCL-SDK
$ mkdir build
$ cd build
$ cmake ..
$ make

And now get a different error after doing "make":

[  1%] Building C object external/OpenCL-ICD-Loader/CMakeFiles/OpenCL.dir/loader/icd.c.o
/usr/home/user/OpenCL-SDK/external/OpenCL-ICD-Loader/loader/icd.c:343:25: error: use of undeclared identifier 'PATH_SEPARATOR'
    next = strchr(path, PATH_SEPARATOR);
                        ^
1 error generated.
*** Error code 1

Stop.
make[2]: stopped in /usr/home/user/OpenCL-SDK/build
*** Error code 1

Stop.
make[1]: stopped in /usr/home/user/OpenCL-SDK/build
*** Error code 1

Stop.
make: stopped in /usr/home/user/OpenCL-SDK/build

Here is the output after doing "cmake":

-- The C compiler identification is Clang 13.0.0
-- The CXX compiler identification is Clang 13.0.0
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /usr/bin/cc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- No build type selected, default to Release
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD - Failed
-- Looking for pthread_create in pthreads
-- Looking for pthread_create in pthreads - not found
-- Looking for pthread_create in pthread
-- Looking for pthread_create in pthread - found
-- Found Threads: TRUE  
-- Looking for secure_getenv
-- Looking for secure_getenv - not found
-- Looking for __secure_getenv
-- Looking for __secure_getenv - not found
-- Check if compiler accepts -pthread
-- Check if compiler accepts -pthread - yes
-- Could NOT find Doxygen (missing: DOXYGEN_EXECUTABLE) 
-- cargs (https://github.com/likle/cargs) not found. To self-host, set cargs_INCLUDE_PATH and cargs_LIBRARY to point to the headers and library respectively adding '-D cargs_INCLUDE_PATH=/path/to/cargs/include/dir -D cargs_LIBRARY/path/to/cargs/libcargs' to the cmake command. (missing: cargs_INCLUDE_PATH cargs_LIBRARY) 
-- Fetching cargs.
-- Adding cargs subproject: /usr/home/user/OpenCL-SDK/build/_deps/cargs-external-src
-- Found TCLAP: /usr/local/include  
-- Stb (https://github.com/nothings/stb) not found. To self-host, set Stb_INCLUDE_PATH to point to the headers adding '-D Stb_INCLUDE_PATH=/path/to/stb' to the cmake command. (missing: Stb_INCLUDE_PATH) 
-- Fetching Stb.
-- Found Stb: /usr/home/user/OpenCL-SDK/build/_deps/stb-external-src  
CMake Warning (dev) at /usr/local/share/cmake/Modules/FindOpenGL.cmake:315 (message):
  Policy CMP0072 is not set: FindOpenGL prefers GLVND by default when
  available.  Run "cmake --help-policy CMP0072" for policy details.  Use the
  cmake_policy command to set the policy and suppress this warning.

  FindOpenGL found both a legacy GL library:

    OPENGL_gl_LIBRARY: /usr/local/lib/libGL.so

  and GLVND libraries for OpenGL and GLX:

    OPENGL_opengl_LIBRARY: /usr/local/lib/libOpenGL.so
    OPENGL_glx_LIBRARY: /usr/local/lib/libGLX.so

  OpenGL_GL_PREFERENCE has not been set to "GLVND" or "LEGACY", so for
  compatibility with CMake 3.10 and below the legacy GL library will be used.
Call Stack (most recent call first):
  cmake/Dependencies/OpenGL/OpenGL.cmake:1 (find_package)
  cmake/Dependencies.cmake:10 (include)
  CMakeLists.txt:49 (include)
This warning is for project developers.  Use -Wno-dev to suppress it.

-- Found OpenGL: /usr/local/lib/libOpenGL.so   
-- Found GLEW: /usr/local/include (found version "2.2.0") 
-- Found Freetype: /usr/local/lib/libfreetype.so (found version "2.12.1") 
-- Performing Test COMPILER_HAS_HIDDEN_VISIBILITY
-- Performing Test COMPILER_HAS_HIDDEN_VISIBILITY - Success
-- Performing Test COMPILER_HAS_HIDDEN_INLINE_VISIBILITY
-- Performing Test COMPILER_HAS_HIDDEN_INLINE_VISIBILITY - Success
-- Performing Test COMPILER_HAS_DEPRECATED_ATTR
-- Performing Test COMPILER_HAS_DEPRECATED_ATTR - Success
-- Looking for sin in m
-- Looking for sin in m - found
-- Configuring done
-- Generating done
-- Build files have been written to: /usr/home/user/OpenCL-SDK/build

Here is the cmakeoutput.log file:

The system is: FreeBSD - 13.1-RELEASE-p1 - amd64
Compiling the C compiler identification source file "CMakeCCompilerId.c" succeeded.
Compiler: /usr/bin/cc 
Build flags: 
Id flags:  

The output was:
0

Compilation of the C compiler identification source "CMakeCCompilerId.c" produced "a.out"

The C compiler identification is Clang, found in "/usr/home/user/OpenCL-SDK/build/CMakeFiles/3.24.0/CompilerIdC/a.out"

Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" succeeded.
Compiler: /usr/bin/c++ 
Build flags: 
Id flags:  

The output was:
0

Compilation of the CXX compiler identification source "CMakeCXXCompilerId.cpp" produced "a.out"

The CXX compiler identification is Clang, found in "/usr/home/user/OpenCL-SDK/build/CMakeFiles/3.24.0/CompilerIdCXX/a.out"

Detecting C compiler ABI info compiled with the following output:
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Run Build Command(s):/usr/local/bin/gmake -f Makefile cmTC_b6fa4/fast && /usr/local/bin/gmake  -f CMakeFiles/cmTC_b6fa4.dir/build.make CMakeFiles/cmTC_b6fa4.dir/build
gmake[1]: Entering directory '/usr/home/user/OpenCL-SDK/build/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_b6fa4.dir/CMakeCCompilerABI.c.o
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gmake[1]: Leaving directory '/usr/home/user/OpenCL-SDK/build/CMakeFiles/CMakeTmp'

Parsed C implicit include dir info from above output: rv=done
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  collapse include dir [/usr/lib/clang/13.0.0/include] ==> [/usr/lib/clang/13.0.0/include]
  collapse include dir [/usr/include] ==> [/usr/include]
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Parsed C implicit link information from above output:
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Detecting CXX compiler ABI info compiled with the following output:
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Thanks.

bashbaug commented 2 years ago

Thanks, this is helpful, and this looks like progress. Unfortunately, it also looks like we'll need some minor updates for the ICD loader and perhaps a few other parts of the SDK to work with FreeBSD.

Here is where PATH_SEPARATOR is defined in icd_platform.h:

#if defined(__linux__) || defined(__APPLE__)

#define PATH_SEPARATOR  ':'
#define DIRECTORY_SYMBOL '/'
// a bit more code here

#elif defined(_WIN32)

#define PATH_SEPARATOR ';'
#define DIRECTORY_SYMBOL '\\'

#endif

Because FreeBSD meets none of these conditions PATH_SEPARATOR is never defined.

A couple of things we can do to fix this:

It would also be nice to add a final #else condition with an informative error if an unknown OS is found.

Could you try making these changes to see if it will work for you? I don't have access to a FreeBSD system.

Useful reference: https://stackoverflow.com/questions/142508/how-do-i-check-os-with-a-preprocessor-directive

rajhlinux commented 2 years ago

Thank You bashbaug, I will try these.

rajhlinux commented 2 years ago

The program have successfully built, Thank You.

I simply modified Line 22 from: #if defined(__linux__) || defined(__APPLE__)

To: #if defined(__uniux__) || defined(__FreeBSD__) || defined(__APPLE__)

Then did a make again:

$ make

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    switch (event.type)
            ^
1 warning generated.
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    switch (event.type)
            ^
1 warning generated.
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As for adding an "else" check for the preprocessor directives in OS checking, this might work placed right above the first #endif directive:

#elif !defined(__uniux__) || !defined(__FreeBSD__) || !defined(__APPLE__) || !defined(_WIN32)
printf("Unknow OS, determined at icd_platform.h");

It did compile but not sure how to trick the compiler to think I am using an OS that is not compatible.

juliohm commented 2 years ago

@bashbaug can this fix be submitted as a PR? That way I can grab the PR as a patch and apply it to the cross-compilation script.

juliohm commented 2 years ago

I mean, a PR to OpenCL-Headers + OpenCL-ICD-Loader, which is the core library we are trying to cross-compile, not the SDK as a whole.

bashbaug commented 2 years ago

Yes - let's move discussion to the issue I just created, since we'll be making changes to the OpenCL ICD loader at least.

https://github.com/KhronosGroup/OpenCL-ICD-Loader/issues/184

I'll create a PR with @rajhlinux's changes. I don't have a FreeBSD system setup to easily test things right now (I can try setting up a VM), so I'll need a bit of help with the review, though.