obj_int_extract for Visual Studio

Enable extraction of assembly offsets from compiled examples in MSVS.
This will allow us to remove some stub functions from x86 assembly since
we will be able to reliably determine structure offsets at compile time.

see ARM code for examples:
vp8/encoder/arm/armv5te/
vpx_scale/arm/neon/

Change-Id: I1852dc6b56ede0bf1dddb5552196222a7c6a902f

libs.mk

diff --git a/libs.mk b/libs.mk
index 37ce0b1..350b310 100644
--- a/libs.mk
+++ b/libs.mk
@@ -9,7 +9,13 @@
 ##
 
 
-ASM:=$(if $(filter yes,$(CONFIG_GCC)),.asm.s,.asm)
+# ARM assembly files are written in RVCT-style. We use some make magic to
+# filter those files to allow GCC compilation
+ifeq ($(ARCH_ARM),yes)
+  ASM:=$(if $(filter yes,$(CONFIG_GCC)),.asm.s,.asm)
+else
+  ASM:=.asm
+endif
 
 CODEC_SRCS-yes += libs.mk
 
@@ -126,6 +132,23 @@
 ifeq ($(CONFIG_EXTERNAL_BUILD),yes)
 ifeq ($(CONFIG_MSVS),yes)
 
+obj_int_extract.vcproj: $(SRC_PATH_BARE)/build/make/obj_int_extract.c
+	@cp $(SRC_PATH_BARE)/build/x86-msvs/obj_int_extract.bat .
+	@echo "    [CREATE] $@"
+	$(SRC_PATH_BARE)/build/make/gen_msvs_proj.sh \
+    --exe \
+    --target=$(TOOLCHAIN) \
+    --name=obj_int_extract \
+    --ver=$(CONFIG_VS_VERSION) \
+    --proj-guid=E1360C65-D375-4335-8057-7ED99CC3F9B2 \
+    $(if $(CONFIG_STATIC_MSVCRT),--static-crt) \
+    --out=$@ $^ \
+    -I. \
+    -I"$(SRC_PATH_BARE)" \
+
+PROJECTS-$(BUILD_LIBVPX) += obj_int_extract.vcproj
+PROJECTS-$(BUILD_LIBVPX) += obj_int_extract.bat
+
 vpx.def: $(call enabled,CODEC_EXPORTS)
 	@echo "    [CREATE] $@"
 	$(SRC_PATH_BARE)/build/make/gen_msvs_def.sh\
@@ -135,15 +158,16 @@
 
 vpx.vcproj: $(CODEC_SRCS) vpx.def
 	@echo "    [CREATE] $@"
-	$(SRC_PATH_BARE)/build/make/gen_msvs_proj.sh\
-			--lib\
-			--target=$(TOOLCHAIN)\
+	$(SRC_PATH_BARE)/build/make/gen_msvs_proj.sh \
+			--lib \
+			--target=$(TOOLCHAIN) \
             $(if $(CONFIG_STATIC_MSVCRT),--static-crt) \
-            --name=vpx\
-            --proj-guid=DCE19DAF-69AC-46DB-B14A-39F0FAA5DB74\
-            --module-def=vpx.def\
-            --ver=$(CONFIG_VS_VERSION)\
-            --out=$@ $(CFLAGS) $^\
+            --name=vpx \
+            --proj-guid=DCE19DAF-69AC-46DB-B14A-39F0FAA5DB74 \
+            --module-def=vpx.def \
+            --ver=$(CONFIG_VS_VERSION) \
+            --out=$@ $(CFLAGS) $^ \
+            --src-path-bare="$(SRC_PATH_BARE)" \
 
 PROJECTS-$(BUILD_LIBVPX) += vpx.vcproj
 
@@ -207,36 +231,38 @@
 #
 # Add assembler dependencies for configuration and offsets
 #
-$(filter %.s.o,$(OBJS-yes)):   $(BUILD_PFX)vpx_config.asm
-$(filter %.asm.o,$(OBJS-yes)): $(BUILD_PFX)vpx_config.asm
+$(filter %.s.o,$(OBJS-yes)):     $(BUILD_PFX)vpx_config.asm
+$(filter %$(ASM).o,$(OBJS-yes)): $(BUILD_PFX)vpx_config.asm
 
 #
 # Calculate platform- and compiler-specific offsets for hand coded assembly
 #
-ifeq ($(ARCH_ARM), yes)
-  asm_com_offsets.asm: obj_int_extract
-  asm_com_offsets.asm: $(VP8_PREFIX)common/asm_com_offsets.c.o
+ifeq ($(CONFIG_EXTERNAL_BUILD),) # Visual Studio uses obj_int_extract.bat
+  ifeq ($(ARCH_ARM), yes)
+    asm_com_offsets.asm: obj_int_extract
+    asm_com_offsets.asm: $(VP8_PREFIX)common/asm_com_offsets.c.o
 	./obj_int_extract rvds $< $(ADS2GAS) > $@
-  OBJS-yes += $(VP8_PREFIX)common/asm_com_offsets.c.o
-  CLEAN-OBJS += asm_com_offsets.asm
-  $(filter %$(ASM).o,$(OBJS-yes)): $(BUILD_PFX)asm_com_offsets.asm
+    OBJS-yes += $(VP8_PREFIX)common/asm_com_offsets.c.o
+    CLEAN-OBJS += asm_com_offsets.asm
+    $(filter %$(ASM).o,$(OBJS-yes)): $(BUILD_PFX)asm_com_offsets.asm
 
-  ifeq ($(CONFIG_VP8_ENCODER), yes)
-    asm_enc_offsets.asm: obj_int_extract
-    asm_enc_offsets.asm: $(VP8_PREFIX)encoder/asm_enc_offsets.c.o
+    ifeq ($(CONFIG_VP8_ENCODER), yes)
+      asm_enc_offsets.asm: obj_int_extract
+      asm_enc_offsets.asm: $(VP8_PREFIX)encoder/asm_enc_offsets.c.o
 	./obj_int_extract rvds $< $(ADS2GAS) > $@
-    OBJS-yes += $(VP8_PREFIX)encoder/asm_enc_offsets.c.o
-    CLEAN-OBJS += asm_enc_offsets.asm
-    $(filter %$(ASM).o,$(OBJS-yes)): $(BUILD_PFX)asm_enc_offsets.asm
-  endif
+      OBJS-yes += $(VP8_PREFIX)encoder/asm_enc_offsets.c.o
+      CLEAN-OBJS += asm_enc_offsets.asm
+      $(filter %$(ASM).o,$(OBJS-yes)): $(BUILD_PFX)asm_enc_offsets.asm
+    endif
 
-  ifeq ($(CONFIG_VP8_DECODER), yes)
-    asm_dec_offsets.asm: obj_int_extract
-    asm_dec_offsets.asm: $(VP8_PREFIX)decoder/asm_dec_offsets.c.o
+    ifeq ($(CONFIG_VP8_DECODER), yes)
+      asm_dec_offsets.asm: obj_int_extract
+      asm_dec_offsets.asm: $(VP8_PREFIX)decoder/asm_dec_offsets.c.o
 	./obj_int_extract rvds $< $(ADS2GAS) > $@
-    OBJS-yes += $(VP8_PREFIX)decoder/asm_dec_offsets.c.o
-    CLEAN-OBJS += asm_dec_offsets.asm
-    $(filter %$(ASM).o,$(OBJS-yes)): $(BUILD_PFX)asm_dec_offsets.asm
+      OBJS-yes += $(VP8_PREFIX)decoder/asm_dec_offsets.c.o
+      CLEAN-OBJS += asm_dec_offsets.asm
+      $(filter %$(ASM).o,$(OBJS-yes)): $(BUILD_PFX)asm_dec_offsets.asm
+    endif
   endif
 endif