[OpenCL] Add -Wconversion to fdeclare-opencl-builtins test

[svenvh]

Summary

Add the -Wconversion -Werror options to check no unexpected conversion
is done.

Patch by Pierre Gondois and Sven van Haastregt.

[Anastasia]

clang/test/SemaOpenCL/fdeclare-opencl-builtins.cl

102

I am slightly confused about this error, isn't get_sub_group_size supposed to return uint?

[svenvh]

clang/test/SemaOpenCL/fdeclare-opencl-builtins.cl

102

I think this is a side-effect from the previous error. It failed to resolve get_sub_group_size so it inserted a placeholder declaration with return type int. Does that make sense?

[Anastasia]

LGTM!

clang/test/SemaOpenCL/fdeclare-opencl-builtins.cl

102

Ok, yes it's possibly a misparsing issue! Thanks!

clang/test/SemaOpenCL/fdeclare-opencl-builtins.cl

-// RUN: %clang_cc1 %s -triple spir -verify -pedantic -fsyntax-only -cl-std=CL -fdeclare-opencl-builtins -DNO_HEADER
-// RUN: %clang_cc1 %s -triple spir -verify -pedantic -fsyntax-only -cl-std=CL -fdeclare-opencl-builtins -finclude-default-header
-// RUN: %clang_cc1 %s -triple spir -verify -pedantic -fsyntax-only -cl-std=CL1.2 -fdeclare-opencl-builtins -DNO_HEADER
-// RUN: %clang_cc1 %s -triple spir -verify -pedantic -fsyntax-only -cl-std=CL1.2 -fdeclare-opencl-builtins -finclude-default-header
-// RUN: %clang_cc1 %s -triple spir -verify -pedantic -fsyntax-only -cl-std=CL2.0 -fdeclare-opencl-builtins -DNO_HEADER
-// RUN: %clang_cc1 %s -triple spir -verify -pedantic -fsyntax-only -cl-std=CL2.0 -fdeclare-opencl-builtins -finclude-default-header
+// RUN: %clang_cc1 %s -triple spir -verify -pedantic -Wconversion -Werror -fsyntax-only -cl-std=CL -fdeclare-opencl-builtins -DNO_HEADER
+// RUN: %clang_cc1 %s -triple spir -verify -pedantic -Wconversion -Werror -fsyntax-only -cl-std=CL -fdeclare-opencl-builtins -finclude-default-header
+// RUN: %clang_cc1 %s -triple spir -verify -pedantic -Wconversion -Werror -fsyntax-only -cl-std=CL1.2 -fdeclare-opencl-builtins -DNO_HEADER
+// RUN: %clang_cc1 %s -triple spir -verify -pedantic -Wconversion -Werror -fsyntax-only -cl-std=CL1.2 -fdeclare-opencl-builtins -finclude-default-header
+// RUN: %clang_cc1 %s -triple spir -verify -pedantic -Wconversion -Werror -fsyntax-only -cl-std=CL2.0 -fdeclare-opencl-builtins -DNO_HEADER
+// RUN: %clang_cc1 %s -triple spir -verify -pedantic -Wconversion -Werror -fsyntax-only -cl-std=CL2.0 -fdeclare-opencl-builtins -finclude-default-header
 
 #if __OPENCL_C_VERSION__ >= CL_VERSION_2_0
 // expected-no-diagnostics
 #endif
 
 // Test the -fdeclare-opencl-builtins option.
 
 #pragma OPENCL EXTENSION cl_khr_fp16 : enable
kernel void basic_image_writeonly(write_only image1d_buffer_t image_write_only_image1d_buffer) {
   write_imagef(image_write_only_image1d_buffer, i, f4);
   write_imageh(image_write_only_image1d_buffer, i, h4);
 }
 
 kernel void basic_subgroup(global uint *out) {
   out[0] = get_sub_group_size();
 #if __OPENCL_C_VERSION__ < CL_VERSION_2_0
 // expected-error@-2{{implicit declaration of function 'get_sub_group_size' is invalid in OpenCL}}
+// expected-error@-3{{implicit conversion changes signedness: 'int' to 'uint' (aka 'unsigned int')}}
 #endif
 }
 
 kernel void basic_vector_data() {
 #if __OPENCL_C_VERSION__ >= CL_VERSION_2_0
   generic void *generic_p;
 #endif
   constant void *constant_p;