ceph/src/spdk/scripts/detect_cc.sh

   1 #!/usr/bin/env bash
   2
   3 set -e
   4
   5 function err()
   6 {
   7         echo "$@" >&2
   8 }
   9
  10 function usage()
  11 {
  12         err "Detect compiler and linker versions, generate mk/cc.mk"
  13         err ""
  14         err "Usage: ./detect_cc.sh [OPTION]..."
  15         err ""
  16         err "Defaults for the options are specified in brackets."
  17         err ""
  18         err "General:"
  19         err " -h, --help                Display this help and exit"
  20         err " --cc=path                 C compiler to use"
  21         err " --cxx=path                C++ compiler to use"
  22         err " --lto=[y|n]               Attempt to configure for LTO"
  23
  24 }
  25
  26 CC=cc
  27 CXX=c++
  28 LTO=n
  29
  30 for i in "$@"; do
  31         case "$i" in
  32                 -h|--help)
  33                         usage
  34                         exit 0
  35                         ;;
  36                 --cc=*)
  37                         CC="${i#*=}"
  38                         ;;
  39                 --cxx=*)
  40                         CXX="${i#*=}"
  41                         ;;
  42                 --lto=*)
  43                         LTO="${i#*=}"
  44                         ;;
  45                 --)
  46                         break
  47                         ;;
  48                 *)
  49                         err "Unrecognized option $i"
  50                         usage
  51                         exit 1
  52         esac
  53 done
  54
  55 CC_TYPE=$($CC -v 2>&1 | grep -o -E '\w+ version' | head -1 | awk '{ print $1 }')
  56 CXX_TYPE=$($CXX -v 2>&1 | grep -o -E '\w+ version' | head -1 | awk '{ print $1 }')
  57 LD_TYPE=$(ld -v 2>&1 | awk '{print $2}')
  58
  59 if [ "$CC_TYPE" != "$CXX_TYPE" ]; then
  60         err "C compiler is $CC_TYPE but C++ compiler is $CXX_TYPE"
  61         err "This may result in errors"
  62 fi
  63
  64 CCAR="ar"
  65 if [ "$LTO" = "y" ]; then
  66         if [ "$CC_TYPE" = "clang" ]; then
  67                 if [ "$LD_TYPE" != "gold" ]; then
  68                         err "Using LTO with clang requires the gold linker."
  69                         exit 1
  70                 fi
  71                  CCAR="llvm-ar"
  72         else
  73                 CCAR="gcc-ar"
  74         fi
  75 fi
  76
  77 echo "CC?=$CC"
  78 echo "CXX?=$CXX"
  79 echo "CCAR=$CCAR"
  80 echo "CC_TYPE=$CC_TYPE"