[Mesa-dev] [PATCH 06/12] android: amd/common: 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/amd/common/ac_llvm_util.c:43:2: error: implicit declaration of function 'LLVMInitializeAMDGPUTargetInfo' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
        LLVMInitializeAMDGPUTargetInfo();
        ^
external/mesa/src/amd/common/ac_llvm_util.c:44:2: error: implicit declaration of function 'LLVMInitializeAMDGPUTarget' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
        LLVMInitializeAMDGPUTarget();
        ^
external/mesa/src/amd/common/ac_llvm_util.c:45:2: error: implicit declaration of function 'LLVMInitializeAMDGPUTargetMC' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
        LLVMInitializeAMDGPUTargetMC();
        ^
external/mesa/src/amd/common/ac_llvm_util.c:46:2: error: implicit declaration of function 'LLVMInitializeAMDGPUAsmPrinter' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
        LLVMInitializeAMDGPUAsmPrinter();
        ^
---
 src/amd/Android.common.mk | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/amd/Android.common.mk b/src/amd/Android.common.mk
index df65c24..c7fd193 100644
--- a/src/amd/Android.common.mk
+++ b/src/amd/Android.common.mk
@@ -30,6 +30,8 @@ LOCAL_MODULE := libmesa_amd_common
 
 LOCAL_SRC_FILES := $(AMD_COMPILER_FILES)
 
+LOCAL_CFLAGS += -DFORCE_BUILD_AMDGPU   # instructs LLVM to declare LLVMInitializeAMDGPU* functions
+
 LOCAL_C_INCLUDES := \
 	$(MESA_TOP)/include \
 	$(MESA_TOP)/src \
-- 
2.9.3