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f72ba42b7c
Projects use `try_compile` to check if they will be able to compile some particular source code. When a language standard variable like `CMAKE_CXX_STANDARD` is set, then the project intends to compile source code using a compiler mode for that standard. Therefore it makes sense for `try_compile` to use that standard in the test project too. Unfortunately this was not done when support for the `CMAKE_CXX_STANDARD` variable was first implemented. Add a policy to introduce the improved behavior in a compatible way. Closes: #16456
24 lines
617 B
CMake
24 lines
617 B
CMake
enable_language(CXX)
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try_compile(result ${CMAKE_CURRENT_BINARY_DIR}
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SOURCES ${CMAKE_CURRENT_SOURCE_DIR}/CxxStandardGNU.cxx
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CXX_STANDARD 11
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CXX_STANDARD_REQUIRED 1
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CXX_EXTENSIONS 0
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OUTPUT_VARIABLE out
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)
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if(NOT result)
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message(FATAL_ERROR "try_compile failed:\n${out}")
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endif()
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cmake_policy(SET CMP0067 NEW)
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set(CMAKE_CXX_STANDARD 11)
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set(CMAKE_CXX_STANDARD_REQUIRED 1)
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set(CMAKE_CXX_EXTENSIONS 0)
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try_compile(result ${CMAKE_CURRENT_BINARY_DIR}
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SOURCES ${CMAKE_CURRENT_SOURCE_DIR}/CxxStandardGNU.cxx
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OUTPUT_VARIABLE out
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)
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if(NOT result)
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message(FATAL_ERROR "try_compile failed:\n${out}")
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endif()
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