Make the SwiftPM build system configurable as a make variable (#180)

Author: cmcgee1024

rpi-4b-blink/Makefile

@@ -15,11 +15,13 @@ TOOLSROOT        := $(REPOROOT)/Tools
 TOOLSET          := $(TOOLSROOT)/Toolsets/rpi-5-elf.json
 LLVM_OBJCOPY     := llvm-objcopy
 SWIFT_BUILD      := swift build
+BUILD_SYSTEM     := native
 
 # Flags
 ARCH             := aarch64
 TARGET           := $(ARCH)-none-none-elf
 SWIFT_BUILD_ARGS := \
+	--build-system $(BUILD_SYSTEM) \
 	--configuration release \
 	--triple $(TARGET) \
 	--toolset $(TOOLSET)

rpi-5-blink/Makefile

@@ -15,11 +15,13 @@ TOOLSROOT        := $(REPOROOT)/Tools
 TOOLSET          := $(TOOLSROOT)/Toolsets/rpi-5-elf.json
 LLVM_OBJCOPY     := llvm-objcopy
 SWIFT_BUILD      := swift build
+BUILD_SYSTEM     := native
 
 # Flags
 ARCH             := aarch64
 TARGET           := $(ARCH)-none-none-elf
 SWIFT_BUILD_ARGS := \
+	--build-system $(BUILD_SYSTEM) \
 	--configuration release \
 	--triple $(TARGET) \
 	--toolset $(TOOLSET)

rpi-pico-blink/Makefile

@@ -15,12 +15,14 @@ TOOLSROOT        := $(REPOROOT)/Tools
 TOOLSET          := $(TOOLSROOT)/Toolsets/pico.json
 MACHO2UF2        := $(TOOLSROOT)/macho2uf2.py
 SWIFT_BUILD      := swift build
+BUILD_SYSTEM     := native
 
 # Flags
 PICO_FAMILY      := rp2040
 ARCH             := armv6m
 TARGET           := $(ARCH)-apple-none-macho
 SWIFT_BUILD_ARGS := \
+	--build-system $(BUILD_SYSTEM) \
 	--configuration release \
 	--triple $(TARGET) \
 	--toolset $(TOOLSET)

rpi-pico2-neopixel/Makefile

@@ -15,11 +15,13 @@ TOOLSROOT        := $(REPOROOT)/Tools
 TOOLSET          := $(TOOLSROOT)/Toolsets/pico2.json
 MACHO2UF2        := $(TOOLSROOT)/macho2uf2.py
 SWIFT_BUILD      := swift build
+BUILD_SYSTEM     := native
 
 # Setup tools and build flags
 ARCH             := armv7em
 TARGET           := $(ARCH)-apple-none-macho
 SWIFT_BUILD_ARGS := \
+	--build-system $(BUILD_SYSTEM) \
 	--configuration release \
 	--triple $(TARGET) \
 	--toolset $(TOOLSET)

stm32-lvgl/Makefile

@@ -17,11 +17,13 @@ ELF2HEX          := $(TOOLSROOT)/elf2hex.py
 SWIFT_BUILD      := swift build
 NM               := nm
 LLVM_TOOLCHAIN   := $(PWD)/llvm-toolchain
+BUILD_SYSTEM     := native
 
 # Flags
 ARCH             := armv7em
 TARGET           := $(ARCH)-none-none-eabi
 SWIFT_BUILD_ARGS := \
+	--build-system $(BUILD_SYSTEM) \
 	--configuration release \
 	--triple $(TARGET) \
 	--toolset $(TOOLSET) \

stm32-neopixel/Makefile

@@ -15,11 +15,13 @@ TOOLSROOT        := $(REPOROOT)/Tools
 TOOLSET          := $(TOOLSROOT)/Toolsets/stm32f74x.json
 MACHO2BIN        := $(TOOLSROOT)/macho2bin.py
 SWIFT_BUILD      := swift build
+BUILD_SYSTEM     := native
 
 # Flags
 ARCH             := armv7em
 TARGET           := $(ARCH)-apple-none-macho
 SWIFT_BUILD_ARGS := \
+	--build-system $(BUILD_SYSTEM) \
 	--configuration release \
 	--triple $(TARGET) \
 	--toolset $(TOOLSET)

stm32-uart-echo/Makefile

@@ -15,11 +15,13 @@ TOOLSROOT        := $(REPOROOT)/Tools
 TOOLSET          := $(TOOLSROOT)/Toolsets/stm32f74x.json
 MACHO2BIN        := $(TOOLSROOT)/macho2bin.py
 SWIFT_BUILD      := swift build
+BUILD_SYSTEM     := native
 
 # Flags
 ARCH             := armv7em
 TARGET           := $(ARCH)-apple-none-macho
 SWIFT_BUILD_ARGS := \
+	--build-system $(BUILD_SYSTEM) \
 	--configuration release \
 	--triple $(TARGET) \
 	--toolset $(TOOLSET)