marseymoji/third_party/pngquant/lib/configure

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#!/usr/bin/env bash
CONFIG="config.mk"
PREFIX="/usr/local"
VERSION=$(grep "define PNGQUANT_VERSION" ../pngquant.c | grep -Eo "[12]\.[0-9.]+")
DEBUG=
SSE=auto
OPENMP=
EXTRA_CFLAGS=
EXTRA_LDFLAGS=
# make gcc default compiler unless CC is already set
CC=${CC:-gcc}
help() {
printf "%4s %s\n" "" "$1"
}
for i in "$@"; do
case $i in
--help)
echo
help "--prefix= installation directory [$PREFIX]"
help "--extra-cflags= append to CFLAGS"
help "--extra-ldflags= append to LDFLAGS"
echo
help "--enable-debug"
help "--enable-sse/--disable-sse enable/disable SSE instructions"
echo
help "--with-openmp compile with multicore support"
echo
exit 0
;;
# Can be set before or after configure. Latter overrides former.
CC=*)
CC=${i#*=}
;;
CFLAGS=*)
CFLAGS=${i#*=}
;;
LDFLAGS=*)
LDFLAGS=${i#*=}
;;
--enable-debug)
DEBUG=1
;;
--enable-sse)
SSE=1
;;
--disable-sse)
SSE=0
;;
--with-openmp)
OPENMP=1
;;
--prefix=*)
PREFIX=${i#*=}
;;
# can be used multiple times or in quotes to set multiple flags
--extra-cflags=*)
EXTRA_CFLAGS="$EXTRA_CFLAGS ${i#*=}"
;;
--extra-ldflags=*)
EXTRA_LDFLAGS="$EXTRA_LDFLAGS ${i#*=}"
;;
*)
echo "error: unknown switch ${i%%=*}"
exit 1
;;
esac
done
# If someone runs sudo make install as very first command, and configure later,
# $CONFIG cannot be overwritten, and must be deleted before continuing.
if [[ -f "$CONFIG" && ! -w "$CONFIG" ]]; then
echo "Cannot overwrite file $CONFIG! Please delete it."
exit 1
fi
cflags() {
CFLAGS="$CFLAGS $1"
}
lflags() {
LDFLAGS="$LDFLAGS $1"
}
status() {
printf "%10s: %s\n" "$1" "$2"
}
# Append to CFLAGS if compiler supports flag, with optional prerequisite.
# Fails on errors and warnings.
conditional_cflags() {
if [ -z "$("$CC" -xc -S -o /dev/null $2 $1 <(echo) 2>&1)" ]; then
cflags "$1"
fi
}
error() {
status "$1" "error ... $2"
echo
exit 1
}
echo
# basic check
if ! "$CC" -xc -std=c99 <(echo "int main(){}") -o /dev/null &> /dev/null; then
error "Compiler" "$CC is no C compiler"
fi
status "Compiler" "$CC"
# init flags
CFLAGS=${CFLAGS:--O3 -fno-math-errno -funroll-loops -fomit-frame-pointer -Wall}
cflags "-std=c99 -I."
lflags "-lm lib/libimagequant.a"
# DEBUG
if [ -z "$DEBUG" ]; then
cflags "-DNDEBUG"
status "Debug" "no"
else
cflags "-g"
status "Debug" "yes"
fi
# SSE
if [ "$SSE" = 'auto' ]; then
if [[ "$(uname -m)" =~ (amd|x86_)64 ||
"$(grep -E -m1 "^flags" /proc/cpuinfo)" =~ "sse" ]]; then
SSE=1
fi
fi
if [ "$SSE" -eq 1 ]; then
status "SSE" "yes"
cflags "-DUSE_SSE=1"
cflags "-msse"
# Silence a later ICC warning due to -msse working slightly different.
conditional_cflags "-wd10121"
# Must be set explicitly for GCC on x86_32. Other compilers imply it.
conditional_cflags "-mfpmath=sse" "-msse"
elif [ "$SSE" -eq 0 ]; then
status "SSE" "no"
cflags "-DUSE_SSE=0"
fi
# OpenMP
if [ -n "$OPENMP" ]; then
if [[ "$("$CC" -xc -E -fopenmp <(echo -e \
"#ifdef _OPENMP
#include <omp.h>
#endif") 2>&1)" =~ "omp_get_thread_num" ]]; then
cflags "-fopenmp"
lflags "-fopenmp"
status "OpenMP" "yes"
else
error "OpenMP" "not supported by compiler"
fi
else
# silence warnings about omp pragmas
cflags "-Wno-unknown-pragmas"
conditional_cflags "-wd3180" # ICC
status "OpenMP" "no"
fi
echo
# As of GCC 4.5, 387 fp math is significantly slower in C99 mode without this.
# Note: CPUs without SSE2 use 387 for doubles, even when SSE fp math is set.
conditional_cflags "-fexcess-precision=fast"
# Intel C++ Compiler
# ICC does usually only produce fast(er) code when it can optimize to the full
# capabilites of the (Intel) CPU. This is equivalent to -march=native for GCC.
conditional_cflags "-xHOST"
# Disable unsafe fp optimizations and enforce fp precision as set in the source.
conditional_cflags "-fp-model source"
# Silence a gold linker warning about string misalignment.
conditional_cflags "-falign-stack=maintain-16-byte"
lflags "-lm" # Ubuntu requires this library last, issue #38
if [ -n "$EXTRA_CFLAGS" ]; then
cflags "$EXTRA_CFLAGS"
fi
if [ -n "$EXTRA_LDFLAGS" ]; then
lflags "$EXTRA_LDFLAGS"
fi
# Overwrite previous configuration.
echo "
# auto-generated by configure
PREFIX = $PREFIX
VERSION = $VERSION
CC = $CC
CFLAGS = $CFLAGS
LDFLAGS = $LDFLAGS
" > $CONFIG