pekka.jaaskelainen added inline comments.
================
Comment at: docs/UsersManual.rst:2065
+
+ $ clang -cc1 -triple spir64-unknown-unknown -cl-ext=-cl_khr_fp64 test.cl
+
----------------
Anastasia wrote:
> pekka.jaaskelainen wrote:
> > Is this correct? I cannot make it work:
> >
> > ```
> > ~/local/stow/llvm-4.0-unpatched-Debug/bin/clang -Xclang
> > -finclude-default-header -emit-llvm -cc1 -triple spir64-unknown-unknown
> > kernel/test_halfs.cl -c -S -o -
> > clang-4.0: error: unknown argument: '-cc1'
> > clang-4.0: error: unknown argument: '-triple'
> > clang-4.0: error: no such file or directory: 'spir64-unknown-unknown'
> > ```
> >
> > -target works instead. (But reveals another issue, there's no printf()
> > declaration, should I file a bug?)
> >
> > ```
> > ~/local/stow/llvm-4.0-unpatched-Debug/bin/clang -Xclang
> > -finclude-default-header -emit-llvm -target spir64-unknown-unknown
> > kernel/test_halfs.cl -c -S -o -
> > kernel/test_halfs.cl:10:9: warning: implicit declaration of function
> > 'printf' is invalid in C99 [-Wimplicit-function-declaration]
> > printf("max(a,b)[0] type=uint2 a=0x15b348c9 b=0xf88e7d07
> > want=0xf88e7d07 got=%x\n", max_[0]);
> > ^
> > kernel/test_halfs.cl:10:9: error: function with no prototype cannot use the
> > spir_function calling convention
> > 1 warning and 1 error generated.
> > ```
> >
> > With 3.9 that kernel which calls printf() passes:
> > ```
> > /local/stow/llvm-3.9-debug/bin/clang -Xclang -finclude-default-header
> > -emit-llvm -target spir64-unknown-unknown kernel/test_halfs.cl -c -S -o -
> > ; ModuleID = 'kernel/test_halfs.cl'
> > source_filename = "kernel/test_halfs.cl"
> > target datalayout =
> > "e-i64:64-v16:16-v24:32-v32:32-v48:64-v96:128-v192:256-v256:256-v512:512-v1024:1024"
> > target triple = "spir64-unknown-unknown"
> > ....
> > ```
> >
> >
> >
> It should be -triple with -cc1 and -target without.
>
> clang -cc1 -triple ...
> clang -target ...
>
> We have disabled the C99 builtin functions as per spec v1.2 s6.9.f, but the
> OpenCL builtins should be available via the header now.
>
> As I can see declaration of printf is in the header under CL1.2 and higher.
>
> Could you try this command instead:
> clang -std=CL1.2 test.cl -Xclang -finclude-default-header
>
Yes, std=CL1.2 helped, good point! But -cc1 -triple doesn't work (unknown
argument). However -target works. This is with Clang 4.0.
https://reviews.llvm.org/D28080
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