[Mesa-dev] [PATCH 04/12] android: radeon: fix LLVMInitializeAMDGPU* functions declaration

[Mauro Rossi]

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/radeon/radeon_llvm_emit.c:121:2: error: implicit declaration of function 'LLVMInitializeAMDGPUTargetInfo' [-Werror=implicit-function-declaration]
  LLVMInitializeAMDGPUTargetInfo();
  ^
external/mesa/src/gallium/drivers/radeon/radeon_llvm_emit.c:122:2: error: implicit declaration of function 'LLVMInitializeAMDGPUTarget' [-Werror=implicit-function-declaration]
  LLVMInitializeAMDGPUTarget();
  ^
external/mesa/src/gallium/drivers/radeon/radeon_llvm_emit.c:123:2: error: implicit declaration of function 'LLVMInitializeAMDGPUTargetMC' [-Werror=implicit-function-declaration]
  LLVMInitializeAMDGPUTargetMC();
  ^
external/mesa/src/gallium/drivers/radeon/radeon_llvm_emit.c:124:2: error: implicit declaration of function 'LLVMInitializeAMDGPUAsmPrinter' [-Werror=implicit-function-declaration]
  LLVMInitializeAMDGPUAsmPrinter();
  ^
---
 src/gallium/drivers/radeon/Android.mk | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/gallium/drivers/radeon/Android.mk b/src/gallium/drivers/radeon/Android.mk
index 2f72f1f..31eaa16 100644
--- a/src/gallium/drivers/radeon/Android.mk
+++ b/src/gallium/drivers/radeon/Android.mk
@@ -32,6 +32,7 @@ LOCAL_SRC_FILES := $(C_SOURCES)
 
 ifeq ($(MESA_ENABLE_LLVM),true)
 LOCAL_SRC_FILES += $(LLVM_C_FILES)
+LOCAL_CFLAGS += -DFORCE_BUILD_AMDGPU   # instructs LLVM to declare LLVMInitializeAMDGPU* functions
 endif
 
 LOCAL_SHARED_LIBRARIES := libdrm_radeon
-- 
2.9.3