In some scenario ac_init_llvm_target may be called twice,
but the LLVM library won't have been unloaded between
the 2 calls, leading to a LLVM warning being printed.
Example pseudo-code to trigger this for radeonsi:
gbm_create_device();
eglInitialize();
eglTerminate();
gbm_device_destroy();
gbm_create_device();
eglInitialize();
eglTerminate();
gbm_device_destroy();
To avoid the warning message from LLVM, clear the command line
parser state before calling LLVMParseCommandLineOptions.
This might fix https://gitlab.freedesktop.org/mesa/mesa/-/issues/5960
This is done only on LLVM 12+ because it seems to break some apps
on LLVM 11 (there has been some work post LLVM 11 release to refactor
CommandLine.cpp, see 42f588f39c5c and the following commits).
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16587>
Pierre-Eric Pelloux-Prayer
7e2874dc93