configure

   1 #!/bin/sh
   2 # Based on the configure script from musl libc, MIT licensed
   3
   4 usage () {
   5 cat <<EOF
   6 Usage: $0 [OPTION]... [VAR=VALUE]...
   7
   8 To assign environment variables (e.g., CC, CFLAGS...), specify them as
   9 VAR=VALUE.  See below for descriptions of some of the useful variables.
  10
  11 Defaults for the options are specified in brackets.
  12
  13 Configuration:
  14   --srcdir=DIR            source directory [detected]
  15
  16 Installation directories:
  17   --prefix=PREFIX         main installation prefix [/usr/local]
  18   --exec-prefix=EPREFIX   installation prefix for executable files [PREFIX]
  19
  20 Fine tuning of the installation directories:
  21   --bindir=DIR            user executables [EPREFIX/bin]
  22   --sharedir=DIR          share directories [PREFIX/share]
  23   --docdir=DIR            misc. documentation [PREFIX/share/doc]
  24   --mandir=DIR            man pages [PREFIX/share/man]
  25
  26 Some influential environment variables:
  27   CC                      C compiler command [detected]
  28   CFLAGS                  C compiler flags [-Os -pipe ...]
  29   LDFLAGS                 Linker flags
  30
  31 Use these variables to override the choices made by configure.
  32
  33 EOF
  34 exit 0
  35 }
  36
  37 # Helper functions
  38
  39 quote () {
  40 tr '\n' ' ' <<EOF | grep '^[-[:alnum:]_=,./:]* $' >/dev/null 2>&1 && { echo "$1" ; return 0 ; }
  41 $1
  42 EOF
  43 printf %s\\n "$1" | sed -e "s/'/'\\\\''/g" -e "1s/^/'/" -e "\$s/\$/'/" -e "s#^'\([-[:alnum:]_,./:]*\)=\(.*\)\$#\1='\2#"
  44 }
  45 echo () { printf "%s\n" "$*" ; }
  46 fail () { echo "$*" ; exit 1 ; }
  47 fnmatch () { eval "case \"\$2\" in $1) return 0 ;; *) return 1 ;; esac" ; }
  48 cmdexists () { type "$1" >/dev/null 2>&1 ; }
  49 trycc () { test -z "$CC" && cmdexists "$1" && CC=$1 ; }
  50
  51 stripdir () {
  52 while eval "fnmatch '*/' \"\${$1}\"" ; do eval "$1=\${$1%/}" ; done
  53 }
  54
  55 trycppif () {
  56 printf "checking preprocessor condition %s... " "$1"
  57 echo "typedef int x;" > "$tmpc"
  58 echo "#if $1" >> "$tmpc"
  59 echo "#error yes" >> "$tmpc"
  60 echo "#endif" >> "$tmpc"
  61 if $CC $2 -c -o "$tmpo" "$tmpc" >/dev/null 2>&1 ; then
  62 printf "false\n"
  63 return 1
  64 else
  65 printf "true\n"
  66 return 0
  67 fi
  68 }
  69
  70 tryflag () {
  71 printf "checking whether compiler accepts %s... " "$2"
  72 echo "typedef int x;" > "$tmpc"
  73 if $CC $CFLAGS_TRY $2 -c -o "$tmpo" "$tmpc" >/dev/null 2>&1 ; then
  74 printf "yes\n"
  75 eval "$1=\"\${$1} \$2\""
  76 eval "$1=\${$1# }"
  77 return 0
  78 else
  79 printf "no\n"
  80 return 1
  81 fi
  82 }
  83
  84 tryldflag () {
  85 printf "checking whether linker accepts %s... " "$2"
  86 echo "typedef int x;" > "$tmpc"
  87 if $CC $LDFLAGS_TRY -nostdlib -shared "$2" -o "$tmpo" "$tmpc" >/dev/null 2>&1 ; then
  88 printf "yes\n"
  89 eval "$1=\"\${$1} \$2\""
  90 eval "$1=\${$1# }"
  91 return 0
  92 else
  93 printf "no\n"
  94 return 1
  95 fi
  96 }
  97
  98 # Beginning of actual script
  99
 100 CFLAGS_AUTO=
 101 CFLAGS_TRY=
 102 LDFLAGS_AUTO=
 103 LDFLAGS_TRY=
 104 SRCDIR=
 105 PREFIX=/usr/local
 106 EXEC_PREFIX='$(PREFIX)'
 107 BINDIR='$(EXEC_PREFIX)/bin'
 108 MANDIR='$(PREFIX)/share/man'
 109
 110 for arg ; do
 111 case "$arg" in
 112 --help|-h) usage ;;
 113 --srcdir=*) SRCDIR=${arg#*=} ;;
 114 --prefix=*) PREFIX=${arg#*=} ;;
 115 --exec-prefix=*) EXEC_PREFIX=${arg#*=} ;;
 116 --bindir=*) BINDIR=${arg#*=} ;;
 117 --sharedir=*) SHAREDIR=${arg#*=} ;;
 118 --docdir=*) DOCDIR=${arg#*=} ;;
 119 --mandir=*) MANDIR=${arg#*=} ;;
 120 --enable-*|--disable-*|--with-*|--without-*|--*dir=*|--build=*) ;;
 121 -* ) echo "$0: unknown option $arg" ;;
 122 CC=*) CC=${arg#*=} ;;
 123 CFLAGS=*) CFLAGS=${arg#*=} ;;
 124 CPPFLAGS=*) CPPFLAGS=${arg#*=} ;;
 125 LDFLAGS=*) LDFLAGS=${arg#*=} ;;
 126 *=*) ;;
 127 *) ;;
 128 esac
 129 done
 130
 131 for i in SRCDIR PREFIX EXEC_PREFIX BINDIR MANDIR ; do
 132 stripdir $i
 133 done
 134
 135 #
 136 # Get the source dir for out-of-tree builds
 137 #
 138 if test -z "$SRCDIR" ; then
 139 SRCDIR="${0%/configure}"
 140 stripdir SRCDIR
 141 fi
 142 abs_builddir="$(pwd)" || fail "$0: cannot determine working directory"
 143 abs_srcdir="$(cd $SRCDIR && pwd)" || fail "$0: invalid source directory $SRCDIR"
 144 test "$abs_srcdir" = "$abs_builddir" && SRCDIR=.
 145 test "$SRCDIR" != "." -a -f Makefile -a ! -h Makefile && fail "$0: Makefile already exists in the working directory"
 146
 147 #
 148 # Get a temp filename we can use
 149 #
 150 i=0
 151 set -C
 152 while : ; do i=$(($i+1))
 153 tmpc="./conf$$-$PPID-$i.c"
 154 tmpo="./conf$$-$PPID-$i.o"
 155 2>|/dev/null > "$tmpc" && break
 156 test "$i" -gt 50 && fail "$0: cannot create temporary file $tmpc"
 157 done
 158 set +C
 159 trap 'rm -f "$tmpc" "$tmpo"' EXIT INT QUIT TERM HUP
 160
 161 #
 162 # Find a C compiler to use
 163 #
 164 printf "checking for C compiler... "
 165 trycc cc
 166 trycc gcc
 167 trycc clang
 168 printf "%s\n" "$CC"
 169 test -n "$CC" || { echo "$0: cannot find a C compiler" ; exit 1 ; }
 170
 171 printf "checking whether C compiler works... "
 172 echo "typedef int x;" > "$tmpc"
 173 if output=$($CC $CPPFLAGS $CFLAGS -c -o "$tmpo" "$tmpc" 2>&1) ; then
 174 printf "yes\n"
 175 else
 176 printf "no; compiler output follows:\n%s\n" "$output"
 177 exit 1
 178 fi
 179
 180 #
 181 # Figure out options to force errors on unknown flags.
 182 #
 183 tryflag   CFLAGS_TRY  -Werror=unknown-warning-option
 184 tryflag   CFLAGS_TRY  -Werror=unused-command-line-argument
 185 tryldflag LDFLAGS_TRY -Werror=unknown-warning-option
 186 tryldflag LDFLAGS_TRY -Werror=unused-command-line-argument
 187
 188 CFLAGS_STD="-std=c99 -D_POSIX_C_SOURCE=200809L -D_XOPEN_SOURCE=700 -DNDEBUG -D_FORTIFY_SOURCE=2"
 189 LDFLAGS_STD="-lc -lutil"
 190
 191 OS=$(uname)
 192
 193 case "$OS" in
 194 FreeBSD) CFLAGS_STD="$CFLAGS_STD -D_BSD_SOURCE -D__BSD_VISIBLE=1" ;;
 195 *BSD)    CFLAGS_STD="$CFLAGS_STD -D_BSD_SOURCE" ;;
 196 Darwin)  CFLAGS_STD="$CFLAGS_STD -D_DARWIN_C_SOURCE" ;;
 197 AIX)     CFLAGS_STD="$CFLAGS_STD -D_ALL_SOURCE" ;;
 198 esac
 199
 200 tryflag CFLAGS -pipe
 201
 202 # Try flags to optimize binary size
 203 tryflag CFLAGS -Os
 204 tryflag CFLAGS -ffunction-sections
 205 tryflag CFLAGS -fdata-sections
 206 tryldflag LDFLAGS_AUTO -Wl,--gc-sections
 207
 208 # Try hardening flags
 209 tryflag CFLAGS -fPIE
 210 tryflag CFLAGS_AUTO -fstack-protector-all
 211 tryldflag LDFLAGS -Wl,-z,now
 212 tryldflag LDFLAGS -Wl,-z,relro
 213 tryldflag LDFLAGS_AUTO -pie
 214
 215 printf "creating config.mk... "
 216
 217 cmdline=$(quote "$0")
 218 for i ; do cmdline="$cmdline $(quote "$i")" ; done
 219
 220 exec 3>&1 1>config.mk
 221
 222 cat << EOF
 223 # This version of config.mk was generated by:
 224 # $cmdline
 225 # Any changes made here will be lost if configure is re-run
 226 SRCDIR = $SRCDIR
 227 PREFIX = $PREFIX
 228 EXEC_PREFIX = $EXEC_PREFIX
 229 BINDIR = $BINDIR
 230 MANPREFIX = $MANDIR
 231 CC = $CC
 232 CFLAGS = $CFLAGS
 233 LDFLAGS = $LDFLAGS
 234 CFLAGS_STD = $CFLAGS_STD
 235 LDFLAGS_STD = $LDFLAGS_STD
 236 CFLAGS_AUTO = $CFLAGS_AUTO
 237 LDFLAGS_AUTO = $LDFLAGS_AUTO
 238 CFLAGS_DEBUG = -U_FORTIFY_SOURCE -UNDEBUG -O0 -g -ggdb -Wall -Wextra -pedantic -Wno-unused-parameter -Wno-sign-compare
 239 EOF
 240 exec 1>&3 3>&-
 241
 242 printf "done\n"
 243
 244 test "$SRCDIR" = "." || ln -sf $SRCDIR/Makefile .