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MSVC: Restore _DEBUG preprocessor definition in RC debug builds

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In commit v3.8.0-rc1~304^2 (MSVC: Do not define _DEBUG explicitly when
using /MDd, 2016-11-15) we removed the `_DEBUG` preprocessor definition
from MSVC C and C++ flags because the `cl` compiler automatically
defines it in Debug builds anyway.  However, the VS generators propagate
C preprocessor definitions to the RC (Windows Resource Compiler) tool.
This means that we used to explicitly define `_DEBUG` for RC debug
builds.  Therefore existing project code may expect the definition to be
there even though the `rc` compiler itself does not implicitly define
`_DEBUG` in debug builds.

Add the `_DEBUG` flag to the default `CMAKE_RC_FLAGS_DEBUG` instead
to restore this definition for RC debug builds.  This also makes it
available consistently in VS, Ninja, and Makefile generators.

Fixes: #16745
This commit is contained in:
Brad King
2017-03-28 13:04:37 -04:00
parent 79a915383f
commit fff34934e7
1 changed files with 3 additions and 0 deletions
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3
Modules/Platform/Windows-MSVC.cmake
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@@ -310,6 +310,9 @@ macro(__windows_compiler_msvc lang)
if(NOT CMAKE_RC_FLAGS_INIT)
string(APPEND CMAKE_RC_FLAGS_INIT " ${_PLATFORM_DEFINES} ${_PLATFORM_DEFINES_${lang}}")
endif()
if(NOT CMAKE_RC_FLAGS_DEBUG_INIT)
string(APPEND CMAKE_RC_FLAGS_DEBUG_INIT " /D_DEBUG")
endif()
enable_language(RC)
set(CMAKE_NINJA_CMCLDEPS_RC 1)