MSVC: Restore _DEBUG preprocessor definition in RC debug builds
In commit 6d0b5ff6 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 (closed)