ceph/src/spdk/scripts/detect_cc.sh

   1 #!/usr/bin/env bash
   2
   3 set -e
   4
   5 function err()
   6 {
   7         echo "$@" >&2
   8 }
   9
  10 function usage()
  11 {
  12         err "Detect compiler and linker versions, generate mk/cc.mk"
  13         err ""
  14         err "Usage: ./detect_cc.sh [OPTION]..."
  15         err ""
  16         err "Defaults for the options are specified in brackets."
  17         err ""
  18         err "General:"
  19         err " -h, --help                Display this help and exit"
  20         err " --cc=path                 C compiler to use"
  21         err " --cxx=path                C++ compiler to use"
  22         err " --ld=path                 Linker to use"
  23         err " --lto=[y|n]               Attempt to configure for LTO"
  24 }
  25
  26
  27
  28 for i in "$@"; do
  29         case "$i" in
  30                 -h|--help)
  31                         usage
  32                         exit 0
  33                         ;;
  34                 --cc=*)
  35                         if [[ -n "${i#*=}" ]]; then
  36                                 CC="${i#*=}"
  37                         fi
  38                         ;;
  39                 --cxx=*)
  40                         if [[ -n "${i#*=}" ]]; then
  41                                 CXX="${i#*=}"
  42                         fi
  43                         ;;
  44                 --lto=*)
  45                         if [[ -n "${i#*=}" ]]; then
  46                                 LTO="${i#*=}"
  47                         fi
  48                         ;;
  49                 --ld=*)
  50                         if [[ -n "${i#*=}" ]]; then
  51                                 LD="${i#*=}"
  52                         fi
  53                         ;;
  54                 --)
  55                         break
  56                         ;;
  57                 *)
  58                         err "Unrecognized option $i"
  59                         usage
  60                         exit 1
  61         esac
  62 done
  63
  64 : ${CC=cc}
  65 : ${CXX=c++}
  66 : ${LD=ld}
  67 : ${LTO=n}
  68
  69 CC_TYPE=$($CC -v 2>&1 | grep -o -E '\w+ version' | head -1 | awk '{ print $1 }')
  70 CXX_TYPE=$($CXX -v 2>&1 | grep -o -E '\w+ version' | head -1 | awk '{ print $1 }')
  71 if [ "$CC_TYPE" != "$CXX_TYPE" ]; then
  72         err "C compiler is $CC_TYPE but C++ compiler is $CXX_TYPE"
  73         err "This may result in errors"
  74 fi
  75
  76 LD_TYPE=$($LD --version 2>&1 | head -n1 | awk '{print $1, $2}')
  77 case "$LD_TYPE" in
  78         "GNU ld"*)
  79                 LD_TYPE=bfd
  80                 ;;
  81         "GNU gold"*)
  82                 LD_TYPE=gold
  83                 ;;
  84         "LLD"*)
  85                 LD_TYPE=lld
  86                 ;;
  87         *)
  88                 err "Unsupported linker: $LD"
  89                 exit 1
  90 esac
  91
  92 CCAR="ar"
  93 if [ "$LTO" = "y" ]; then
  94         if [ "$CC_TYPE" = "clang" ]; then
  95                 if [ "$LD_TYPE" != "gold" ]; then
  96                         err "Using LTO with clang requires the gold linker."
  97                         exit 1
  98                 fi
  99                 CCAR="llvm-ar"
 100         else
 101                 CCAR="gcc-ar"
 102         fi
 103 fi
 104
 105 function set_default() {
 106         echo "ifeq (\$(origin $1),default)"
 107         echo "$1 = $2"
 108         echo "endif"
 109         echo ""
 110 }
 111
 112 set_default CC $CC
 113 set_default CXX $CXX
 114 set_default LD $LD
 115
 116 echo "CCAR=$CCAR"
 117 echo "CC_TYPE=$CC_TYPE"
 118 echo "LD_TYPE=$LD_TYPE"