Decide automatically whether to use GCC or Clang.

[mdw-cross] / src / cross.in

#! /bin/sh -e

case $# in
  0) echo 2>&1 "usage: ${0##*/} ENV [CMD [ARGS ...]]"; exit 2 ;;
esac
env=$1; shift
case $# in
  0) set -- "$SHELL" ;;
esac

: ${CROSSDIR=@crossdir@}; export CROSSDIR

if ! [ -f "$CROSSDIR/etc/$env-setup.sh" ]; then
  echo 2>&1 "${0##*/}: cross environment \`$env' unknown"; exit 2
fi

if type >/dev/null 2>&1; then CROSS_COMPILER_PREFIX="ccache "
else CROSS_COMPILER_PREFIX=
fi
export CROSS_COMPILER_PREFIX

CROSS_BUILDENV=$env; export CROSS_BUILDENV

if [ -f "$CROSSDIR/etc/$env-config.site" ]
then CONFIG_SITE=$CROSSDIR/etc/$env-config.site
else CONFIG_SITE=$CROSSDIR/etc/common-cross-config.site
fi
export CONFIG_SITE

CROSS_PREFIX=$CROSSDIR/inst.$env; export CROSS_PREFIX
. "$CROSSDIR/etc/$env-setup.sh"

case ${CROSS_ARCH+t} in
  t) ;;
  *) echo 2>&1 "${0##*/}: setup script didn't set \`CROSS_ARCH'"; exit 2 ;;
esac
export CROSS_ARCH

case :$PATH: in
  *:"$CROSSDIR/tools:"*) ;;
  *) PATH=$CROSSDIR/tools:$PATH ;;
esac

case ${CROSS_NATIVE_P-nil} in
  t) gcc=gcc clang=clang ;;
  nil) gcc=$CROSS_ARCH-gcc clang=${CROSS_clang_TOOL-clang} ;;
esac
if type >/dev/null 2>&1 "$gcc"; then found_gcc=t; else found_gcc=nil; fi
if type >/dev/null 2>&1 "$clang"; then found_clang=t; else found_clang=nil; fi
case ${CROSS_COMPILER-guess},$found_gcc,$found_clang in
  guess,t,* | prefer-gcc,t,* | gcc,t,* | prefer-clang,t,nil)
    CROSS_COMPILER=gcc ;;
  guess,nil,t | prefer-clang,*,t | clang,*,t | prefer-gcc,nil,t)
    CROSS_COMPILER=clang ;;
  guess,* | prefer-gcc,* | prefer-clang,*)
    echo 2>&1 "${0##*/}: couldn't find C compiler \`$gcc' or \`$clang'"
    exit 2
    ;;
  gcc,*) echo 2>&1 "${0##*/}: couldn't find C compiler \`$gcc'"; exit 2 ;;
  clang,*) echo 2>&1 "${0##*/}: couldn't find C compiler \`$clang'"; exit 2 ;;
  *)
    echo 2>&1 "${0##*/}: unrecognized preferred compiler \`$CROSS_COMPILER'"
    exit 2
    ;;
esac
export CROSS_COMPILER

exec "$@"