Unlike COMPILER_RT_HAS_CRT this handles the case where CRT is available
but has been disabled by setting COMPILER_RT_BUILD_CRT. This addresses
an issue reported on D153989.
Differential Revision: https://reviews.llvm.org/D155126
On Linux crt is typically use in combination with builtins. In the Clang
driver the use of builtins and crt is controlled by the --rtlib option.
Both builtins and crt also have similar build requirements where they
need to be built before any other runtimes and must avoid dependencies.
We also want builtins and crt these to be buildable separately from the
rest of compiler-rt for bootstrapping purposes. Given how simple crt is,
rather than maintaining a separate directory with its own separate build
setup, it's more efficient to just move crt into builtins. We still use
separate CMake option to control whether to built crt same as before.
This is an alternative to D89492 and D136664.
Differential Revision: https://reviews.llvm.org/D153989
On Linux crt is typically use in combination with builtins. In the Clang
driver the use of builtins and crt is controlled by the --rtlib option.
Both builtins and crt also have similar build requirements where they
need to be built before any other runtimes and must avoid dependencies.
We also want builtins and crt these to be buildable separately from the
rest of compiler-rt for bootstrapping purposes. Given how simple crt is,
rather than maintaining a separate directory with its own separate build
setup, it's more efficient to just move crt into builtins. We still use
separate CMake option to control whether to built crt same as before.
This is an alternative to D89492 and D136664.
Differential Revision: https://reviews.llvm.org/D153989
