android: radeonsi: fix LLVMInitializeAMDGPU* functions declaration

LLVMInitializeAMDGPU* functions need to be explicitly declared
and mesa expects them via <llvm-c/Target.h> header,
but LLVM needs to be instructed to invoke its own LLVM_TARGET(AMDGPU) macro,
or the functions will not be available.

A new llvm cflag (-DFORCE_BUILD_AMDGPU) serves this purpose,
the same mechanism is used also by other llvm targets e.g. FORCE_BUILD_ARM

A necessary prerequisite is to have AMDGPU target handled accordingly
in llvm config files i.e. {Target,AsmParser,AsmPrinter}.def
for llvm device build includes.

This avoids the following building errors:

external/mesa/src/gallium/drivers/radeonsi/si_shader_tgsi_setup.c:129:2: error: implicit declaration of function 'LLVMInitializeAMDGPUTargetInfo' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
        LLVMInitializeAMDGPUTargetInfo();
        ^
external/mesa/src/gallium/drivers/radeonsi/si_shader_tgsi_setup.c:130:2: error: implicit declaration of function 'LLVMInitializeAMDGPUTarget' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
        LLVMInitializeAMDGPUTarget();
        ^
external/mesa/src/gallium/drivers/radeonsi/si_shader_tgsi_setup.c:131:2: error: implicit declaration of function 'LLVMInitializeAMDGPUTargetMC' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
        LLVMInitializeAMDGPUTargetMC();
        ^
external/mesa/src/gallium/drivers/radeonsi/si_shader_tgsi_setup.c:132:2: error: implicit declaration of function 'LLVMInitializeAMDGPUAsmPrinter' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
        LLVMInitializeAMDGPUAsmPrinter();
        ^

Acked-by: Nicolai Hähnle <[email protected]>
Acked-by: Emil Velikov <[email protected]>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/gallium/drivers/radeonsi/Android.mk b/src/gallium/drivers/radeonsi/Android.mk
index e35f6b13d30..b32c8dc3978 100644
--- a/src/gallium/drivers/radeonsi/Android.mk
+++ b/src/gallium/drivers/radeonsi/Android.mk
@@ -30,6 +30,8 @@ include $(CLEAR_VARS)
 
 LOCAL_SRC_FILES := $(C_SOURCES)
 
+LOCAL_CFLAGS += -DFORCE_BUILD_AMDGPU   # instructs LLVM to declare LLVMInitializeAMDGPU* functions
+
 LOCAL_C_INCLUDES := $(MESA_TOP)/src/amd/common
 
 LOCAL_SHARED_LIBRARIES := libdrm_radeon