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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
41 lines
1.3 KiB
CMake
41 lines
1.3 KiB
CMake
enable_language(C)
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set(CMAKE_POLICY_WARNING_CMP0067 ON)
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message("before try_compile with CMP0067 WARN-enabled but no variables")
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try_compile(RESULT ${CMAKE_CURRENT_BINARY_DIR}
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${CMAKE_CURRENT_SOURCE_DIR}/src.c
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)
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message("after try_compile with CMP0067 WARN-enabled but no variables")
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set(CMAKE_POLICY_WARNING_CMP0067 OFF)
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#-----------------------------------------------------------------------------
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set(CMAKE_C_STANDARD 90)
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message("before try_compile with CMP0067 WARN-default")
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try_compile(RESULT ${CMAKE_CURRENT_BINARY_DIR}
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${CMAKE_CURRENT_SOURCE_DIR}/src.c
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)
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message("after try_compile with CMP0067 WARN-default")
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set(CMAKE_POLICY_WARNING_CMP0067 ON)
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message("before try_compile with CMP0067 WARN-enabled")
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try_compile(RESULT ${CMAKE_CURRENT_BINARY_DIR}
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${CMAKE_CURRENT_SOURCE_DIR}/src.c
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)
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message("after try_compile with CMP0067 WARN-enabled")
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cmake_policy(SET CMP0067 OLD)
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message("before try_compile with CMP0067 OLD")
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try_compile(RESULT ${CMAKE_CURRENT_BINARY_DIR}
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${CMAKE_CURRENT_SOURCE_DIR}/src.c
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)
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message("after try_compile with CMP0067 OLD")
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cmake_policy(SET CMP0066 NEW)
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message("before try_compile with CMP0067 NEW")
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try_compile(RESULT ${CMAKE_CURRENT_BINARY_DIR}
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${CMAKE_CURRENT_SOURCE_DIR}/src.c
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)
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message("after try_compile with CMP0067 NEW")
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