#!/bin/sh
#
# Detects OS we're compiling on and outputs a file specified by the first
# argument, which in turn gets read while processing Makefile.
#
# The output will set the following variables:
#   CC                          C Compiler path
#   CXX                         C++ Compiler path
#   PLATFORM_LDFLAGS            Linker flags
#   PLATFORM_LIBS               Libraries flags
#   PLATFORM_SHARED_EXT         Extension for shared libraries
#   PLATFORM_SHARED_LDFLAGS     Flags for building shared library
#                               This flag is embedded just before the name
#                               of the shared library without intervening spaces
#   PLATFORM_SHARED_CFLAGS      Flags for compiling objects for shared library
#   PLATFORM_CCFLAGS            C compiler flags
#   PLATFORM_CXXFLAGS           C++ compiler flags.  Will contain:
#   PLATFORM_SHARED_VERSIONED   Set to 'true' if platform supports versioned
#                               shared libraries, empty otherwise.
#

OUTPUT=config.mk
# Delete existing output, if it exists
rm -f $OUTPUT
touch $OUTPUT

if test -z "$CC"; then
    CC=cc
fi

if test -z "$CXX"; then
    CXX=g++
fi

if test -z "$TMPDIR"; then
    TMPDIR=/tmp
fi

# Detect OS
if test -z "$TARGET_OS"; then
    TARGET_OS=`uname -s`
fi
COMMON_FLAGS=
CROSS_COMPILE=
PLATFORM_CCFLAGS=
PLATFORM_CXXFLAGS=
PLATFORM_LDFLAGS=
PLATFORM_LIBS=
PLATFORM_SHARED_EXT="so"
PLATFORM_SHARED_LDFLAGS="-shared -Wl,-soname -Wl,"
PLATFORM_SHARED_CFLAGS="-fPIC"
PLATFORM_SHARED_VERSIONED=true

case "$TARGET_OS" in
    CYGWIN_*)
        PLATFORM=OS_LINUX
        COMMON_FLAGS="$MEMCMP_FLAG -lpthread -DOS_LINUX -DCYGWIN"
        PLATFORM_LDFLAGS="-lpthread"
        PORT_FILE=port/port_posix.cc
        ;;
    Darwin)
        PLATFORM=OS_MACOSX
        COMMON_FLAGS="$MEMCMP_FLAG -DOS_MACOSX -Dthread_local=__thread -Wno-deprecated-declarations"
        PLATFORM_SHARED_EXT=dylib
        [ -z "$INSTALL_PATH" ] && INSTALL_PATH=`pwd`
        PLATFORM_SHARED_LDFLAGS="-dynamiclib -install_name $INSTALL_PATH/"
        PORT_FILE=port/port_posix.cc
        ;;
    Linux)
        PLATFORM=OS_LINUX
        COMMON_FLAGS="$MEMCMP_FLAG -pthread -DOS_LINUX"
        PLATFORM_LDFLAGS="-pthread"
        PORT_FILE=port/port_posix.cc
        ;;
    SunOS)
        PLATFORM=OS_SOLARIS
        COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_SOLARIS"
        PLATFORM_LIBS="-lpthread -lrt"
        PORT_FILE=port/port_posix.cc
        ;;
    FreeBSD)
        PLATFORM=OS_FREEBSD
        COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_FREEBSD"
        PLATFORM_LIBS="-lpthread"
        PORT_FILE=port/port_posix.cc
        ;;
    NetBSD)
        PLATFORM=OS_NETBSD
        COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_NETBSD"
        PLATFORM_LIBS="-lpthread -lgcc_s"
        PORT_FILE=port/port_posix.cc
        ;;
    OpenBSD)
        PLATFORM=OS_OPENBSD
        COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_OPENBSD"
        PLATFORM_LDFLAGS="-pthread"
        PORT_FILE=port/port_posix.cc
        ;;
    DragonFly)
        PLATFORM=OS_DRAGONFLYBSD
        COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_DRAGONFLYBSD"
        PLATFORM_LIBS="-lpthread"
        PORT_FILE=port/port_posix.cc
        ;;
    OS_ANDROID_CROSSCOMPILE)
        PLATFORM=OS_ANDROID
        COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_ANDROID -DLEVELDB_PLATFORM_POSIX"
        PLATFORM_LDFLAGS=""  # All pthread features are in the Android C library
        PORT_FILE=port/port_posix.cc
        CROSS_COMPILE=true
        ;;
    HP-UX)
        PLATFORM=OS_HPUX
        COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_HPUX"
        PLATFORM_LDFLAGS="-pthread"
        PORT_FILE=port/port_posix.cc
        # man ld: +h internal_name
        PLATFORM_SHARED_LDFLAGS="-shared -Wl,+h -Wl,"
        ;;
    IOS)
        PLATFORM=IOS
        COMMON_FLAGS="$MEMCMP_FLAG -DOS_MACOSX"
        [ -z "$INSTALL_PATH" ] && INSTALL_PATH=`pwd`
        PORT_FILE=port/port_posix.cc
        PLATFORM_SHARED_EXT=
        PLATFORM_SHARED_LDFLAGS=
        PLATFORM_SHARED_CFLAGS=
        PLATFORM_SHARED_VERSIONED=
        ;;
    *)
        echo "Unknown platform!" >&2
        exit 1
esac

$CXX -x c++ - -o $TMPDIR/handy_build_config.out <<EOF
int main(){
  unsigned short a = 1;
  return *(unsigned char*)&a == 1;
}
EOF
$TMPDIR/handy_build_config.out
PLATFORM_IS_LITTLE_ENDIAN=$?

#$CXX -x c++ - -o $TMPDIR/handy_build_config.out >/dev/null 2>&1 <<EOF
##include <sys/epoll.h>
#int main() {}
#EOF
#[ $? = 0 ] && COMMON_FLAGS="$COMMON_FLAGS -DUSE_EPOLL"

$CXX -x c++ - -o $TMPDIR/handy_build_config.out >/dev/null 2>&1 <<EOF
#include <openssl/ssl.h>
int main() {}
EOF
[ $? = 0 ] && SSL=1 && ! [ -e ssl ] && git clone https://github.com/yedf/handy-ssl.git ssl
[ x$SSL = x1 ] && PLATFORM_LIBS="$PLATFORM_LIBS -lssl -lcrypto"

PWD=`pwd`
COMMON_FLAGS="$COMMON_FLAGS -DLITTLE_ENDIAN=$PLATFORM_IS_LITTLE_ENDIAN -std=c++11 -I$PWD"
PLATFORM_CCFLAGS="$PLATFORM_CCFLAGS $COMMON_FLAGS"
PLATFORM_CXXFLAGS="$PLATFORM_CXXFLAGS $COMMON_FLAGS"
PLATFORM_LDFLAGS="$PLATFORM_LDFLAGS -L$PWD"

echo "CC=$CC" >> $OUTPUT
echo "CXX=$CXX" >> $OUTPUT
echo "PLATFORM=$PLATFORM" >> $OUTPUT
echo "PLATFORM_LDFLAGS=$PLATFORM_LDFLAGS" >> $OUTPUT
echo "PLATFORM_LIBS=$PLATFORM_LIBS" >> $OUTPUT
echo "PLATFORM_CCFLAGS=$PLATFORM_CCFLAGS" >> $OUTPUT
echo "PLATFORM_CXXFLAGS=$PLATFORM_CXXFLAGS" >> $OUTPUT
echo "PLATFORM_SHARED_CFLAGS=$PLATFORM_SHARED_CFLAGS" >> $OUTPUT
echo "PLATFORM_SHARED_EXT=$PLATFORM_SHARED_EXT" >> $OUTPUT
echo "PLATFORM_SHARED_LDFLAGS=$PLATFORM_SHARED_LDFLAGS" >> $OUTPUT
echo "PLATFORM_SHARED_VERSIONED=$PLATFORM_SHARED_VERSIONED" >> $OUTPUT
[ x$SSL = x1 ] && echo "HANDY_SOURCES=ssl/ssl-conn.cc" >> $OUTPUT
[ x$SSL = x1 ] && echo "EXAMPLE_SOURCES=ssl/ssl-cli.cc ssl/ssl-svr.cc ssl/https-svr.cc" >> $OUTPUT