Manually running yasm from cmake.

secp256k1/CMakeLists.txt

@@ -3,16 +3,27 @@ cmake_policy(SET CMP0015 NEW)
 set(CMAKE_ASM_COMPILER "yasm")
 
 #aux_source_directory(. SRC_LIST)
-if(APPLE)
+
+if ("${TARGET_PLATFORM}" STREQUAL "w64")
+	add_custom_command(
+        	OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/field_5x52_asm.o
+        	COMMAND yasm -f win64 -o ${CMAKE_CURRENT_BINARY_DIR}/field_5x52_asm.o ${CMAKE_CURRENT_SOURCE_DIR}/field_5x52_asm.asm
+	)
+	add_custom_target(
+        	asmOut ALL
+        	DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/field_5x52_asm.o
+	)
+	add_library(secp256k1 secp256k1.c ${CMAKE_CURRENT_BINARY_DIR}/field_5x52_asm.o)
+	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=gnu99 -DUSE_FIELD_5X52 -DUSE_FIELD_5X52_ASM -DUSE_NUM_GMP -DUSE_FIELD_INV_NUM")
+elseif(APPLE)
 	# set(CMAKE_INSTALL_PREFIX ../lib)
 	add_library(secp256k1 SHARED secp256k1.c field_5x52_asm.asm)
+	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=c99 -DUSE_FIELD_GMP -DUSE_NUM_GMP -DUSE_FIELD_INV_NUM")
 else()
 	add_library(secp256k1 secp256k1.c field_5x52_asm.asm)
+	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=c99 -DUSE_FIELD_GMP -DUSE_NUM_GMP -DUSE_FIELD_INV_NUM")
 endif()
 
-#set(CMAKE_C_FLAGS "-DUSE_FIELD_5X52 -DUSE_FIELD_5X52_ASM -DUSE_NUM_OPENSSL -DUSE_FIELD_INV_BUILTIN")
-#target_link_libraries(secp256k1 crypto)
-set(CMAKE_C_FLAGS "-std=c99 -DUSE_FIELD_GMP -DUSE_NUM_GMP -DUSE_FIELD_INV_NUM")
 target_link_libraries(secp256k1 gmp)
 
 if(${CMAKE_SYSTEM_NAME} MATCHES "Darwin")