toybox/scripts/portability.sh
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   1# sourced to find alternate names for things
   2
   3source ./configure
   4
   5if [ -z "$(command -v "${CROSS_COMPILE}${CC}")" ]
   6then
   7  echo "No ${CROSS_COMPILE}${CC} found" >&2
   8  exit 1
   9fi
  10
  11if [ -z "$SED" ]
  12then
  13  [ ! -z "$(command -v gsed 2>/dev/null)" ] && SED=gsed || SED=sed
  14fi
  15
  16# Tell linker to do dead code elimination at function level
  17if [ "$(uname)" == "Darwin" ]
  18then
  19  CFLAGS+=" -Wno-deprecated-declarations"
  20  : ${LDOPTIMIZE:=-Wl,-dead_strip} ${STRIP:=strip}
  21else
  22  : ${LDOPTIMIZE:=-Wl,--gc-sections -Wl,--as-needed} ${STRIP:=strip -s -R .note* -R .comment}
  23fi
  24
  25# Address Sanitizer
  26if [ ! -z "$ASAN" ]; then
  27  # Turn ASan on and disable most optimization to get more readable backtraces.
  28  # (Technically ASAN is just "-fsanitize=address" and the rest is optional.)
  29  ASAN_FLAGS="-fsanitize=address -O1 -g -fno-omit-frame-pointer -fno-optimize-sibling-calls"
  30  CFLAGS="$CFLAGS $ASAN_FLAGS"
  31  HOSTCC="$HOSTCC $ASAN_FLAGS"
  32  NOSTRIP=1
  33  # Ignore leaks on exit. TODO
  34  export ASAN_OPTIONS="detect_leaks=0"
  35  unset ASAN
  36fi
  37
  38# Probe number of available processors, and add one.
  39: ${CPUS:=$(($(nproc 2>/dev/null || sysctl -n hw.ncpu 2>/dev/null)+1))}
  40
  41# Centos 7 bug workaround, EOL June 30 2024. TODO
  42DASHN=-n; wait -n 2>/dev/null; [ $? -eq 2 ] && unset DASHN
  43
  44# If the build is using gnu tools, make them behave less randomly.
  45export LANG=c
  46export LC_ALL=C
  47