configure

#!/bin/sh
# Based on the configure script from musl libc, MIT licensed; vis, ISC licensed

usage () {
    cat <<EOF
Usage: $0 [OPTION]... [VAR=VALUE]...

To assign environment variables (e.g., CC, CFLAGS...), specify them as
VAR=VALUE.  See below for descriptions of some of the useful variables.

Defaults for the options are specified in brackets.

Configuration:
  --config-file=FILE      save config to FILE [config.mk]

Optional configuration:
  --minimal=yes           do not include extra features (default=no)
  --arch=ARCH             use -march=ARCH. Set to 'none' for none, else defaults to 'native'

Installation directories:
  --prefix=PREFIX         main installation prefix [\$PREFIX or /usr/local]
  --exec-prefix=EPREFIX   installation prefix for bin, lib, include [PREFIX]

Fine tuning of the installation directories:
  --sharedir=DIR          share directories [PREFIX/share]
  --docdir=DIR            misc. documentation [PREFIX/share/doc]
  --mandir=DIR            man pages [PREFIX/share/man]

Optional features:
  --enable-pie            build with position independent executables [auto]
  --enable-pic            build with position independent shared libraries [auto]

Some influential environment variables:
  CC                      C compiler command [detected]
  AWK                     AWK tool command [detected]
  MAKE                    gmake tool command [detected]
  AR                      archive command [detected]
  RANLIB                  ranlib archive indexer command [detected]
  CFLAGS                  C compiler flags [-Os -pipe ...]
  LDFLAGS                 Linker flags

  CROSS_COMPILING=no      Set to yes to disable auto-detect compilation flags

Use these variables to override the choices made by configure.

EOF
    exit 0
}

# Helper functions

quote () {
    tr '\n' ' ' <<EOF | grep '^[-[:alnum:]_=,./:]* $' >/dev/null 2>&1 && { echo "$1" ; return 0 ; }
$1
EOF
    printf %s\\n "$1" | sed -e "s/'/'\\\\''/g" -e "1s/^/'/" -e "\$s/\$/'/" -e "s#^'\([-[:alnum:]_,./:]*\)=\(.*\)\$#\1='\2#"
}
echo () { printf "%s\n" "$*" ; }
fail () { echo "$*" ; exit 1 ; }
fnmatch () { eval "case \"\$2\" in $1) return 0 ;; *) return 1 ;; esac" ; }
cmdexists () { type "$1" >/dev/null 2>&1 ; }
trycc1 () { test -z "$CC" && cmdexists "$1" && ( "$1" --version | grep -i gcc ) >/dev/null 2>/dev/null && CC=$1 ; }
trycc2 () { test -z "$CC" && cmdexists "$1" && CC=$1 ; }
tryar () { test -z "$AR" && cmdexists "$1" && AR=$1 ; }
tryranlib () { test -z "$RANLIB" && cmdexists "$1" && RANLIB=$1 ; }
tryawk () { test -z "$AWK" && "$1" 'function works () {return 0} BEGIN{exit works()}' && AWK=$1 ; }
trymake() {
    if test -z "$MAKE" && cmdexists "$1" ; then
	v=`$1 --version | grep 'GNU Make' | sed -e 's/.*Make //'`
	if [ "$v" = "" ] ; then
	    printf "Found but not using non-GNU make ($1)... "
	else
	    MAKE="$1"
	    maj=`echo $v | cut -d. -f 1`
	    min=`echo $v | cut -d. -f 2`
	    if ! test $maj -gt 3 -o '(' $maj -eq 3 -a $min -ge 81 ')' ; then
		printf "Warning: using make, but version $v < 3.81 has not been tested. "
	    fi
	fi
    fi
}

stripdir () {
    while eval "fnmatch '*/' \"\${$1}\"" ; do eval "$1=\${$1%/}" ; done
}

NO_HAVE=
trycchdr () {
    printf "checking whether there is a header called %s... " "$2"
    dn=`dirname "$2"`
    if [ "$dn" != "" ]; then
	dn="/$dn"
	bn=`basename "$2"`
	for x in $CCSEARCHPATH ; do
	    fnd=$fnd"$x$dn "
	done
    else
	bn="$2"
	fnd=$CCSEARCHPATH
    fi
    upper2=$(echo "$2" | tr a-z A-Z | tr . _ | tr / _)
    if find $fnd -name "$bn" 2>/dev/null | grep "/$2$" >/dev/null 2>&1 ; then
        eval "$1=\"\${$1} -DHAVE_\${upper2}\""
        eval "$1=\${$1# }"
        printf "yes\n"
        return 0
    else
        printf "no\n"
        NO_HAVE="$NO_HAVE
NO_$upper2 = 1"
        return 1
    fi
}

trycpusupport() {
    rm -f "$tmpc"
    printf "checking whether CPU accepts $1... "
    cat >> "$tmpc" <<EOF
int main() {
  if(__builtin_cpu_supports("$1"))
    return 0;
  return 1;
}
EOF
    $CC -o "$tmpe" "$tmpc" >/dev/null 2>&1 && "$tmpe" && echo "yes" && return 0;
    echo "no"
    return 1;
}

tryccfn () {
    rm -f "$tmpc"
    if [ "$5" != "" ] ; then
        printf "checking whether compiler accepts %s from %s with %s... " "$2" "$3" "$5"
        echo "$5" >> "$tmpc"
    else
        printf "checking whether compiler accepts %s from %s..." "$2" "$3"
    fi
    if [ "$3" != "" ]; then
        printf "%s\n" $3 | sed 's/\(.*\)/#include <\1>/' >> "$tmpc"
    fi
    cat >> "$tmpc" <<EOF
int main() {$2;}
EOF
    flag=$(echo "$2" | cut -d'(' -f1 | tr a-z A-Z)
    if $CC -o "$tmpo" "$tmpc" >/dev/null 2>&1 ; then
        if [ "$4" != "" ] ; then
            lib=$(echo "$4" | tr a-z A-Z | tr . _)
            USE_LIBS="$USE_LIBS
USE_LIB_$lib = 1"
        fi

        eval "vars=\$$1"
        if ! printf "%s\n" ${vars} | grep "\-DHAVE_${flag}\$" >/dev/null 2>&1; then
            flag="-DHAVE_${flag}"
            eval "$1=\"\${vars} \${flag}\""
            eval "$1=\${$1# }"
        fi
        printf "yes\n"
        return 0
    else
        printf "no\n"
        NO_HAVE="$NO_HAVE
NO_$flag = 1"
        echo "------" >> $CONFIGFILE.log
        echo "Failed: $CC -o $tmpo tmp.c" >> $CONFIGFILE.log
        cat "$tmpc" >> $CONFIGFILE.log
        echo "------" >> $CONFIGFILE.log
        return 1
    fi
}

tryccfn1 () {
    rm -f "$tmpc"
    printf "checking whether compiler accepts %s(%s)..." "$2" "$3"
    cat >> "$tmpc" <<EOF
int main() {$2($3);}
EOF
    flag=$(echo "$2" | cut -d'(' -f1 | tr a-z A-Z)
    eval "vars=\$$1"
    if $CC -o "$tmpo" "$tmpc" >/dev/null 2>&1 ; then
        flag="-DHAVE_${flag}"
        have=1
    else
        flag="-DNO_${flag}"
        have=0
    fi
    if ! printf "%s\n" ${vars} | grep "\-D${flag}\$" >/dev/null 2>&1; then
        eval "$1=\"\${vars} \${flag}\""
        eval "$1=\${$1# }"
    fi
    if [ "$have" = "1" ]; then
        printf "yes\n"
        return 0
    else
        printf "no\n"
        return 1
    fi
}

tryflag () {
    printf "checking whether compiler accepts %s... " "$2"
    echo "int main() {return 0;}" > "$tmpc"
    if $CC $CFLAGS_TRY $2 -c -o "$tmpo" "$tmpc" >/dev/null 2>&1 ; then
        printf "yes\n"
        eval "$1=\"\${$1} \$2\""
        eval "$1=\${$1# }"
        return 0
    else
        printf "no\n"
        return 1
    fi
}

tryldflag () { # var, flag, other_arguments (optional)
    printf "checking whether linker accepts %s... " "$2"
    echo "int main(){return 0;}" > "$tmpc"
    if $CC $LDFLAGS "$2" $3 -o "$tmpo" "$tmpc" >/dev/null 2>&1 ; then
        printf "yes\n"
        eval "$1=\"\${$1} \$2\""
        eval "$1=\${$1# }"
        return 0
    else
        printf "no\n"
        return 1
    fi
}

trysharedldflag () {
    printf "checking whether linker accepts %s... " "$2"
    echo "typedef int x;" > "$tmpc"
    if $CC $LDFLAGS -shared "$2" -o "$tmpo" "$tmpc" >/dev/null 2>&1 ; then
        printf "yes\n"
        eval "$1=\"\${$1} \$2\""
        eval "$1=\${$1# }"
        return 0
    else
        printf "no\n"
        return 1
    fi
}

# Beginning of actual script
if [ "$CROSS_COMPILING" = "" ]; then
    CROSS_COMPILING=no
fi
CFLAGS_AUTO=
CFLAGS_TRY=
LDFLAGS_AUTO=
LDFLAGS_TRY=
CONFIGFILE=$CONFIGFILE
if [ "$CONFIGFILE" = "" ]; then
    CONFIGFILE=config.mk
fi

if [ "$CROSS_COMPILING" = "yes" ]; then
    ARCH=none
fi
if [ "$ARCH" = "" ] && [ "$CROSS_COMPILING" = "no" ]; then
    ARCH=native
fi

# check prefixes first, since others may be derived from it unless overridden
PREFIX=$PREFIX
for arg ; do
    case "$arg" in
        --prefix=*) PREFIX=${arg#*=} ;;
    esac
done
if [ "$PREFIX" = "" ]; then
    PREFIX=/usr/local
elif [ "$PREFIX" = "${PREFIX#/}" ]; then
    PREFIX="`pwd`/$PREFIX"
fi

EXEC_PREFIX=$EXEC_PREFIX
for arg ; do
    case "$arg" in
        --exec-prefix=*) EXEC_PREFIX=${arg#*=} ;;
    esac
done
if [ "$EXEC_PREFIX" = "" ]; then
    EXEC_PREFIX=$PREFIX
elif [ "$EXEC_PREFIX" = "${EXEC_PREFIX#/}" ]; then
    EXEC_PREFIX="`pwd`/$EXEC_PREFIX"
fi

DOCDIR='$(PREFIX)/share/doc'
MANDIR='$(PREFIX)/share/man'

MINIMAL=no

help=yes
usepie=auto
usepic=auto

for arg ; do
    case "$arg" in
        --help|-h) usage ;;
        --host=*) host=${arg#*=} ;;

        --arch=*) ARCH=${arg#*=} ;;
        ARCH=*) ARCH=${arg#*=} ;;

        --config-file=*) CONFIGFILE=${arg#*=} ;;
        CONFIGFILE=*) CONFIGFILE=${arg#*=} ;;

        --prefix=*) ;; # already handled
        --exec-prefix=*) ;; # already handled EXEC_PREFIX=${arg#*=} ;;
        --docdir=*) DOCDIR=${arg#*=} ;;
        --mandir=*) MANDIR=${arg#*=} ;;
        --minimal|--minimal=yes) MINIMAL=yes;;

        --enable-pie|--enable-pie=yes) usepie=yes ;;
        --enable-pie=auto) usepie=auto ;;
        --disable-pie|--enable-pie=no) usepie=no ;;

        --enable-pic|enable-pic=yes) usepic=yes ;;

        --enable-pic=auto) usepic=auto ;;
        --disable-pic|--enable-pic=no) usepic=no ;;
        --enable-*|--disable-*|--with-*|--without-*|--*dir=*|--build=*) ;;
        -* ) echo "$0: unknown option $arg" ;;
        CC=*) CC=${arg#*=} ;;
        CFLAGS=*) CFLAGS=${arg#*=} ;;
        CPPFLAGS=*) CPPFLAGS=${arg#*=} ;;
        LDFLAGS=*) LDFLAGS=${arg#*=} ;;
        *=*) ;;
        *) ;;
    esac
done

echo "config will be saved to $CONFIGFILE"

for i in PREFIX EXEC_PREFIX DOCDIR MANDIR ; do
    stripdir $i
done

#
# Get a temp filename we can use
#
i=0
set -C
while : ; do i=$(($i+1))
             tmpc="./conf$$-$PPID-$i.c"
             tmpo="./conf$$-$PPID-$i.o"
             tmpe="./conf$$-$PPID-$i._"
             2>|/dev/null > "$tmpc" && break
             test "$i" -gt 50 && fail "$0: cannot create temporary file $tmpc"
done
set +C
trap 'rm -f "$tmpc" "$tmpo" "$tmpe"' EXIT QUIT TERM HUP
trap 'rm -f "$tmpc" "$tmpo" "$tmpe" && echo && fail "$0: interrupted"' INT

#
# Find an AWK tool to use
#
printf "checking for AWK tool... "
for a in awk gawk mawk nawk; do tryawk "$a"; done
printf "%s\n" "$AWK"
test -n "$AWK" || fail "$0: cannot find an AWK tool"

#
# Find a MAKE tool to use#

printf "checking for MAKE tool... "
for a in make gmake ; do trymake "$a"; done
printf "%s\n" "$MAKE"
test -n "$MAKE" || fail "$0: cannot find a MAKE tool"

#
# Find a C compiler to use
#
printf "checking for C compiler... "
for c in cc gcc gcc-11 gcc-10 gcc-9 gcc-8 gcc-7 clang; do trycc1 "$c"; done
for c in cc gcc gcc-11 gcc-10 gcc-9 gcc-8 gcc-7 clang; do trycc2 "$c"; done
printf "%s\n" "$CC"
test -n "$CC" || fail "$0: cannot find a C compiler"

printf "checking whether C compiler works... "
echo "typedef int x;" > "$tmpc"
if output=$($CC $CPPFLAGS $CFLAGS -c -o "$tmpo" "$tmpc" 2>&1) ; then
    printf "yes\n"
else
    fail "no; compiler output follows:\n%s\n" "$output"
fi

#
# Get compiler search paths
#
CCSEARCHPATH=$(echo | ${CC} -E -Wp,-v - 2>&1 | ${AWK} '/ \//{print substr($0,2);}')

#
# Check if it is clang, and the llvm tools instead
compiler=$(${CC} -v 2>&1 | ${AWK} '/ +version +/{for(i=1;i<=NF;i++){if($i=="version"){printf("%s\n",(last=="LLVM")?"clang":last);exit 0;}last=$i;}}')
if test "$compiler" = "clang"; then
    arlist="$CC-llvm-ar $host-llvm-ar $CC-ar $host-ar llvm-ar `ls /usr/bin/llvm-ar* 2>/dev/null` ar"
    ranliblist="$CC-llvm-ranlib $host-llvm-ranlib $CC-ranlib $host-ranlib llvm-ranlib `ls /usr/bin/llvm-ranlib* 2>/dev/null` ranlib"
else
    arlist="$CC-ar $host-$compiler-ar $host-ar $compiler-ar ar"
    ranliblist="$CC-ranlib $host-$compiler-ranlib $host-ranlib $compiler-ranlib $compiler-ranlib ranlib"
fi

#
# Find ar and ranlib to use
#
printf "checking for ar... "
for a in $arlist; do tryar "$a"; done
printf "%s\n" "$AR"
test -n "$AR" || fail "$0: cannot find ar"

printf "checking for ranlib... "
for r in $ranliblist ; do tryranlib "$r"; done
printf "%s\n" "$RANLIB"
test -n "$RANLIB" || fail "$0: cannot find ranlib"

#
# Detect the host system
#
printf 'checking host system type... '
test -n "$host" || host=$($CC -dumpmachine 2>/dev/null) || fail "could not determine host"
printf '%s\n' "$host"

# start the log
cat >$CONFIGFILE.log <<_ACEOF
Config log. Invocation command line was
  $ $0 $@

_ACEOF

#
# Figure out options to force errors on unknown flags.
#
tryflag   CFLAGS_TRY  -Werror=unknown-warning-option
tryflag   CFLAGS_TRY  -Werror=unused-command-line-argument
tryflag   CFLAGS_TRY  -Werror=ignored-optimization-argument
tryldflag LDFLAGS_TRY -Werror=unknown-warning-option
tryldflag LDFLAGS_TRY -Werror=unused-command-line-argument
tryldflag LDFLAGS_TRY -Werror=ignored-optimization-argument

CFLAGS_STD="-std=gnu11 -D_POSIX_C_SOURCE=200809L -U_XOPEN_SOURCE -D_XOPEN_SOURCE=700"
# CFLAGS_OPT="-DNDEBUG"
MINGW=0
case "$host" in
    *-*freebsd*) CFLAGS_STD="$CFLAGS_STD -D_BSD_SOURCE -D__BSD_VISIBLE=1" ;;
    *-*netbsd*) CFLAGS_STD="$CFLAGS_STD -D_NETBSD_SOURCE" ;;
    *-*bsd*) CFLAGS_STD="$CFLAGS_STD -D_BSD_SOURCE" ;;
    *-*darwin*) CFLAGS_STD="$CFLAGS_STD -D_DARWIN_C_SOURCE" ;;
    *-*mingw32|*-*msys*|*-windows-gnu)
	CFLAGS_STD="$CFLAGS_STD -D__USE_MINGW_ANSI_STDIO"
	MINGW=1
	usepie=no
	usepic=no
	;;
esac

if test "$usepie" = "auto" ; then
    usepie=yes
fi

if test "$usepic" = "auto" ; then
    usepic=yes
fi

tryflag CFLAGS_VECTORIZE -fvectorize
tryflag CFLAGS_VECTORIZE -ftree-vectorize
tryflag CFLAGS_VECTORIZE_OPTIMIZED -fopt-info-vec-optimized
tryflag CFLAGS_VECTORIZE_MISSED -fopt-info-vec-missed
tryflag CFLAGS_VECTORIZE_ALL -fopt-info-vec-all

if test "$usepie" = "yes" ; then
    tryflag CFLAGS_PIE -fpie || tryflag CFLAGS_PIE -fPIE
fi

if test "$usepic" = "yes" ; then
    tryflag CFLAGS_PIC -fpic || tryflag CFLAGS_PIC -fPIC
fi

test "$usepie" = "yes" && tryldflag LDFLAGS_PIE -pie

if test "$usepic" = "yes" ; then
    trysharedldflag LDFLAGS_PIC -fpic || trysharedldflag LDFLAGS_PIC -fPIC
fi

test "$usepie" = "no" && tryflag CFLAGS_PIE -fno-pie
test "$usepic" = "no" && tryflag CFLAGS_PIC -fno-pic
test "$usepie" = "no" && tryldflag LDFLAGS_PIE -no-pie
test "$usepic" = "no" && trysharedldflag LDFLAGS_PIC -fno-pic

tryflag CFLAGS -pipe

# Try flags to optimize speed
tryflag CFLAGS -ffunction-sections
tryflag CFLAGS -fdata-sections

tryflag CFLAGS_OPT -fvisibility=hidden
tryldflag LDFLAGS_AUTO -Wl,--gc-sections

if [ "$ARCH" != "none" ] ; then
    if ! tryflag CFLAGS -march=$ARCH ; then
        echo "Flag -march=$ARCH failed!"
        exit 1
    fi
fi
tryldflag LDFLAGS_OPT -ldl

# Try hardening flags
if test "$usepie" = "yes" ; then
    case "$LDFLAGS_PIE" in
        *pie*)
	    tryldflag LDFLAGS_PIE -Wl,-z,now
	    tryldflag LDFLAGS_PIE -Wl,-z,relro
	    ;;
    esac
fi
if test "$usepic" = "yes" ; then
    case "$LDFLAGS_PIC" in
        *pic*)
	    tryldflag LDFLAGS_PIC -Wl,-z,now
	    tryldflag LDFLAGS_PIC -Wl,-z,relro
	    ;;
    esac
fi

# Optional features
if test "$usedebugstderr" = "yes" ; then
    USE_DEBUG_STDERR=1
else
    USE_DEBUG_STDERR=0
fi

printf "creating $CONFIGFILE... "

cmdline=$(quote "$0")
for i ; do cmdline="$cmdline $(quote "$i")" ; done

exec 3>&1 1> $CONFIGFILE

cat << EOF
# This version of $CONFIGFILE was generated by:
# $cmdline
# Any changes made here will be lost if configure is re-run
PREFIX = $PREFIX
EXEC_PREFIX = $EXEC_PREFIX
BINDIR = $EXEC_PREFIX/bin
LIBDIR = $EXEC_PREFIX/lib
INCLUDEDIR = $EXEC_PREFIX/include

DOCPREFIX = $DOCDIR
MANPREFIX = $MANDIR
CC = $CC
AWK = $AWK
MAKE = $MAKE

AR = $AR
RANLIB = $RANLIB
CFLAGS = $CFLAGS
LDFLAGS = $LDFLAGS
CFLAGS_STD = $CFLAGS_STD
LDFLAGS_STD = $LDFLAGS_STD
CFLAGS_OPT = $CFLAGS_OPT
LDFLAGS_OPT = $LDFLAGS_OPT
STATIC_LIBS = $STATIC_LIBS
CFLAGS_AUTO = $CFLAGS_AUTO
LDFLAGS_AUTO = $LDFLAGS_AUTO

CFLAGS_DEBUG = -U_FORTIFY_SOURCE -UNDEBUG -O0 -g -Wall -Wextra -Wno-missing-field-initializers -Wunused # -g3 -ggdb
LDFLAGS_DEBUG = -U_FORTIFY_SOURCE -UNDEBUG -O0 -g # -g3 -ggdb
CFLAGS_PIC = $CFLAGS_PIC
LDFLAGS_PIC = $LDFLAGS_PIC
CFLAGS_PIE = $CFLAGS_PIE
LDFLAGS_PIE = $LDFLAGS_PIE
USE_DEBUG_STDERR = $USE_DEBUG_STDERR
CFLAGS_VECTORIZE = $CFLAGS_VECTORIZE
CFLAGS_VECTORIZE_OPTIMIZED = $CFLAGS_VECTORIZE_OPTIMIZED
CFLAGS_VECTORIZE_MISSED = $CFLAGS_VECTORIZE_MISSED
CFLAGS_VECTORIZE_ALL = $CFLAGS_VECTORIZE_ALL

$NO_HAVE
$USE_LIBS

EOF
exec 1>&3 3>&-

printf "done\n"

echo ""
echo "****************************************************************"
echo "*  bzip2_file configuration done                               *"
echo "****************************************************************"

echo "****************************************************************"

if ! [ "$MAKE" = "" ]; then
    echo ""
    echo "To build and install, run:"
    echo "  $MAKE install"
    echo ""
    echo "Other common commands:"
    echo "  $MAKE                     # print available make commands"
    echo "  (cd src && $MAKE install) # install library"
    echo "  (cd app && $MAKE install) # install library and zsv CLI"
    echo "  $MAKE uninstall           # uninstall library and zsv CLI"
    echo "  $MAKE clean               # remove build artifacts"
    echo ""
fi

if ! "$CC" --version | grep -i gcc >/dev/null && ! "$CC" --version | grep -i clang >/dev/null ; then
    echo "*********************** WARNING!! ***********************"
    echo "* Non-gcc/clang compiler untested; use at your own risk *"
    echo "* consider using gcc or clang instead e.g.:             *"
    echo "*       ./configure CC=gcc-11                           *"
    echo "*********************************************************"
    echo ""
fi

exit 0