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MSVC: Document and test behavior of empty MSVC_RUNTIME_LIBRARY

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Extend tests added by commit fb3370b6a1 (MSVC: Add abstraction for
runtime library selection, 2019-04-10) to cover an empty value for
the property.  It should result in no specific setting.

Issue: #19108
This commit is contained in:
Brad King 2019-04-19 11:32:40 -04:00
parent 8542152626
commit 61f70e81a7
4 changed files with 27 additions and 1 deletions
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5
Help/prop_tgt/MSVC_RUNTIME_LIBRARY-VALUES.txt
View File

@ -13,3 +13,8 @@
The value is ignored on non-MSVC compilers but an unsupported value will
be rejected as an error when using a compiler targeting the MSVC ABI.
The value may also be the empty string (``""``) in which case no runtime
library selection flag will be added explicitly by CMake. Note that with
:ref:`Visual Studio Generators` the native build system may choose to
add its own default runtime library selection flag.

15
Tests/MSVCRuntimeLibrary/CMakeLists.txt
View File

@ -42,7 +42,22 @@ endfunction()
function(verify lang src)
add_library(default-${lang} ${src})
target_compile_definitions(default-${lang} PRIVATE VERIFY_MT VERIFY_DLL "$<$<CONFIG:Debug>:VERIFY_DEBUG>")
verify_combinations(MultiThreaded ${lang} ${src})
# Test known MSVC default behavior when no flag is given.
if(CMAKE_${lang}_COMPILER_ID STREQUAL "MSVC")
set(CMAKE_MSVC_RUNTIME_LIBRARY "")
add_library(empty-${lang} ${src})
if(CMAKE_${lang}_COMPILER_VERSION VERSION_GREATER_EQUAL 14)
# VS 2005 and above default to multi-threaded.
target_compile_definitions(empty-${lang} PRIVATE VERIFY_MT)
endif()
if(CMAKE_GENERATOR MATCHES "Visual Studio ([^9]|9[0-9])")
# VS 2010 and above have a different default runtime library for projects than 'cl'.
target_compile_definitions(empty-${lang} PRIVATE VERIFY_DLL)
endif()
endif()
endfunction()
verify(C verify.c)

4
Tests/RunCMake/VS10Project/RuntimeLibrary-check.cmake
View File

@ -20,7 +20,7 @@ macro(RuntimeLibrary_check tgt rtl_expect)
endif()
endforeach()
if(NOT HAVE_Runtimelibrary)
if(NOT HAVE_Runtimelibrary AND NOT "${rtl_expect}" STREQUAL "")
set(RunCMake_TEST_FAILED "Project file ${tgt}.vcxproj does not have a RuntimeLibrary field.")
return()
endif()
@ -28,6 +28,8 @@ endmacro()
RuntimeLibrary_check(default-C MultiThreadedDebugDLL)
RuntimeLibrary_check(default-CXX MultiThreadedDebugDLL)
RuntimeLibrary_check(empty-C "")
RuntimeLibrary_check(empty-CXX "")
RuntimeLibrary_check(MTd-C MultiThreadedDebug)
RuntimeLibrary_check(MTd-CXX MultiThreadedDebug)
RuntimeLibrary_check(MT-C MultiThreaded)

4
Tests/RunCMake/VS10Project/RuntimeLibrary.cmake
View File

@ -6,6 +6,10 @@ enable_language(CXX)
add_library(default-C empty.c)
add_library(default-CXX empty.cxx)
set(CMAKE_MSVC_RUNTIME_LIBRARY "")
add_library(empty-C empty.c)
add_library(empty-CXX empty.cxx)
set(CMAKE_MSVC_RUNTIME_LIBRARY "MultiThreadedDebug")
add_library(MTd-C empty.c)
add_library(MTd-CXX empty.cxx)