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cmake: force MSVC compiler charset to utf-8 #9989

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This commit is to prevent tests\test-grammar-integration.cpp(483,13): error C2001: newline in constant showing up in non-UTF8 windows system while using MSVC.

@github-actions github-actions bot added the build Compilation issues label Oct 21, 2024
CMakeLists.txt Outdated
@@ -46,6 +46,13 @@ if (WIN32)
add_compile_definitions(_CRT_SECURE_NO_WARNINGS)
endif()

if (NOT GGML_CUDA)
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What is the reason for disabling this with GGML_CUDA? Shouldn't these changes only apply to C/C++ sources anyway?

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It's because these changes will cause cuda failed to build.

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Does this work?

if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC")
    add_compile_options("$<$<COMPILE_LANGUAGE:C>:/source-charset:utf-8>")
    add_compile_options("$<$<COMPILE_LANGUAGE:CXX>:/source-charset:utf-8>")
    add_compile_options("$<$<COMPILE_LANGUAGE:C>:/execution-charset:utf-8>")
    add_compile_options("$<$<COMPILE_LANGUAGE:CX>:/execution-charset:utf-8>")
endif()

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It works.

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