build.sh

#!/bin/sh

set -vex

# Determine file paths
REPOROOT=$(git rev-parse --show-toplevel)
TOOLSROOT="$REPOROOT/Tools"
SRCROOT="$REPOROOT/stm32-blink"
BUILDROOT="$SRCROOT/.build"

# Setup tools and build flags
TARGET=armv7-apple-none-macho

SWIFT_EXEC=${SWIFT_EXEC:-$(xcrun -f swiftc)}
SWIFT_FLAGS="-target $TARGET -Osize -import-bridging-header $SRCROOT/BridgingHeader.h -wmo -enable-experimental-feature Embedded -Xcc -D__APPLE__ -Xcc -D__MACH__ -Xcc -ffreestanding"

CLANG_EXEC=${CLANG_EXEC:-$(xcrun -f clang)}
CLANG_FLAGS="-target $TARGET -Oz"

LD_EXEC=${LD_EXEC:-$CLANG_EXEC}
LD_FLAGS="-target $TARGET -nostdlib -static -Wl,-e,_reset -dead_strip -Wl,-no_zero_fill_sections -Wl,-segalign,4 -Wl,-segaddr,__VECTORS,0x00200000 -Wl,-seg1addr,0x00200200 -Wl,-pagezero_size,0"

PYTHON_EXEC=${PYTHON_EXEC:-$(xcrun -f python3)}
MACHO2BIN="$TOOLSROOT/macho2bin.py"

# Create build directory
mkdir -p "$BUILDROOT"

# Build Swift sources
"$SWIFT_EXEC" "$SWIFT_FLAGS" -c "$SRCROOT/*.swift" -o "$BUILDROOT/blink.o"

# Build C sources
"$CLANG_EXEC" "$CLANG_FLAGS" -c "$SRCROOT/Startup.c" -o "$BUILDROOT/Startup.o"

# Link objects into executable
"$LD_EXEC" "$LD_FLAGS" "$BUILDROOT/blink.o" "$BUILDROOT/Startup.o" -o "$BUILDROOT/blink"

# Extract sections from executable into flashable binary
"$PYTHON_EXEC" "$MACHO2BIN" "$BUILDROOT/blink" "$BUILDROOT/blink.bin" --base-address 0x00200000 --segments '__TEXT,__DATA,__VECTORS'

# Echo final binary path
ls -al "$BUILDROOT/blink.bin"