pkg-config multiarch stuff

cross.sh

#!/bin/sh

if [ $TARGET == "x86_64-unknown-linux-gnu" ]; then
    cargo build --target=$TARGET --release

elif [ $TARGET == "x86_64-apple-darwin" ]; then
    cargo build --target=$TARGET --release

elif [ $TARGET == "armv7-unknown-linux-gnueabihf" ]; then
    sh ./cross-linux-armhf.sh

elif [ $TARGET == "i686-pc-windows-gnu" ]; then
    sh ./cross-win-x86.sh

else

fi

linux-armhf.sh

#!/bin/sh

# Platform: arm-linux-gnueabihf
# This requires multiarch (armhf) as well as libusb-dev:armhf

export SYSROOT=/usr/arm-linux-gnueabihf


export PKG_CONFIG_ALLOW_CROSS=1

export PKG_CONFIG_LIBDIR=/usr/lib/arm-linux-gnueabihf/pkgconfig
export PKG_CONFIG_SYSROOT_DIR=${SYSROOT}

export PKG_CONFIG_SYSTEM_LIBRARY_PATH=/usr/lib/arm-linux-gnueabihf
export PKG_CONFIG_SYSTEM_INCLUDE_PATH=/usr/arm-linux-gnueabihf/include

cargo build --target armv7-unknown-linux-gnueabihf

windows-x86.sh

#!/bin/sh

# Platform: windows 32 bit mingw
# this requires gcc-mingw-w64 and mingw-w64
# as well as a win32 libusb to be findable with pkg-config


export ARCH=i686
export TARGET=${ARCH}-w64-mingw32

export SYSROOT=/usr/${TARGET}

export PKG_CONFIG_ALLOW_CROSS=1

export PKG_CONFIG_LIBDIR=/usr/lib/${TARGET}/pkgconfig
export PKG_CONFIG_SYSROOT_DIR=/usr/lib/gcc/${TARGET}/8.3-posix

export PKG_CONFIG_SYSTEM_LIBRARY_PATH=${SYSROOT}/lib
export PKG_CONFIG_SYSTEM_INCLUDE_PATH=${SYSROOT}/include

export PKG_CONFIG_PATH=$PKG_CONFIG_PATH:`pwd`/scripts/win

cargo build --target ${ARCH}-pc-windows-gnu