src/leveldb/build_detect_platform

   1 #!/bin/sh
   2 #
   3 # Detects OS we're compiling on and outputs a file specified by the first
   4 # argument, which in turn gets read while processing Makefile.
   5 #
   6 # The output will set the following variables:
   7 #   CC                          C Compiler path
   8 #   CXX                         C++ Compiler path
   9 #   PLATFORM_LDFLAGS            Linker flags
  10 #   PLATFORM_LIBS               Libraries flags
  11 #   PLATFORM_SHARED_EXT         Extension for shared libraries
  12 #   PLATFORM_SHARED_LDFLAGS     Flags for building shared library
  13 #                               This flag is embedded just before the name
  14 #                               of the shared library without intervening spaces
  15 #   PLATFORM_SHARED_CFLAGS      Flags for compiling objects for shared library
  16 #   PLATFORM_CCFLAGS            C compiler flags
  17 #   PLATFORM_CXXFLAGS           C++ compiler flags.  Will contain:
  18 #   PLATFORM_SHARED_VERSIONED   Set to 'true' if platform supports versioned
  19 #                               shared libraries, empty otherwise.
  20 #
  21 # The PLATFORM_CCFLAGS and PLATFORM_CXXFLAGS might include the following:
  22 #
  23 #       -DLEVELDB_ATOMIC_PRESENT     if <atomic> is present
  24 #       -DLEVELDB_PLATFORM_POSIX     for Posix-based platforms
  25 #       -DSNAPPY                     if the Snappy library is present
  26 #
  27
  28 OUTPUT=$1
  29 PREFIX=$2
  30 if test -z "$OUTPUT" || test -z "$PREFIX"; then
  31   echo "usage: $0 <output-filename> <directory_prefix>" >&2
  32   exit 1
  33 fi
  34
  35 # Delete existing output, if it exists
  36 rm -f $OUTPUT
  37 touch $OUTPUT
  38
  39 if test -z "$CC"; then
  40     CC=cc
  41 fi
  42
  43 if test -z "$CXX"; then
  44     CXX=g++
  45 fi
  46
  47 if test -z "$TMPDIR"; then
  48     TMPDIR=/tmp
  49 fi
  50
  51 # Detect OS
  52 if test -z "$TARGET_OS"; then
  53     TARGET_OS=`uname -s`
  54 fi
  55
  56 COMMON_FLAGS=
  57 CROSS_COMPILE=
  58 PLATFORM_CCFLAGS=
  59 PLATFORM_CXXFLAGS=
  60 PLATFORM_LDFLAGS=
  61 PLATFORM_LIBS=
  62 PLATFORM_SHARED_EXT="so"
  63 PLATFORM_SHARED_LDFLAGS="-shared -Wl,-soname -Wl,"
  64 PLATFORM_SHARED_CFLAGS="-fPIC"
  65 PLATFORM_SHARED_VERSIONED=true
  66
  67 MEMCMP_FLAG=
  68 if [ "$CXX" = "g++" ]; then
  69     # Use libc's memcmp instead of GCC's memcmp.  This results in ~40%
  70     # performance improvement on readrandom under gcc 4.4.3 on Linux/x86.
  71     MEMCMP_FLAG="-fno-builtin-memcmp"
  72 fi
  73
  74 case "$TARGET_OS" in
  75     CYGWIN_*)
  76         PLATFORM=OS_LINUX
  77         COMMON_FLAGS="$MEMCMP_FLAG -lpthread -DOS_LINUX -DCYGWIN"
  78         PLATFORM_LDFLAGS="-lpthread"
  79         PORT_FILE=port/port_posix.cc
  80         ;;
  81     Darwin)
  82         PLATFORM=OS_MACOSX
  83         COMMON_FLAGS="$MEMCMP_FLAG -DOS_MACOSX"
  84         PLATFORM_SHARED_EXT=dylib
  85         [ -z "$INSTALL_PATH" ] && INSTALL_PATH=`pwd`
  86         PLATFORM_SHARED_LDFLAGS="-dynamiclib -install_name $INSTALL_PATH/"
  87         PORT_FILE=port/port_posix.cc
  88         ;;
  89     Linux)
  90         PLATFORM=OS_LINUX
  91         COMMON_FLAGS="$MEMCMP_FLAG -pthread -DOS_LINUX"
  92         PLATFORM_LDFLAGS="-pthread"
  93         PORT_FILE=port/port_posix.cc
  94         ;;
  95     SunOS)
  96         PLATFORM=OS_SOLARIS
  97         COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_SOLARIS"
  98         PLATFORM_LIBS="-lpthread -lrt"
  99         PORT_FILE=port/port_posix.cc
 100         ;;
 101     FreeBSD)
 102         PLATFORM=OS_FREEBSD
 103         COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_FREEBSD"
 104         PLATFORM_LIBS="-lpthread"
 105         PORT_FILE=port/port_posix.cc
 106         ;;
 107     GNU/kFreeBSD)
 108         PLATFORM=OS_KFREEBSD
 109         COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_KFREEBSD"
 110         PLATFORM_LIBS="-lpthread"
 111         PORT_FILE=port/port_posix.cc
 112         ;;
 113     NetBSD)
 114         PLATFORM=OS_NETBSD
 115         COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_NETBSD"
 116         PLATFORM_LIBS="-lpthread -lgcc_s"
 117         PORT_FILE=port/port_posix.cc
 118         ;;
 119     OpenBSD)
 120         PLATFORM=OS_OPENBSD
 121         COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_OPENBSD"
 122         PLATFORM_LDFLAGS="-pthread"
 123         PORT_FILE=port/port_posix.cc
 124         ;;
 125     DragonFly)
 126         PLATFORM=OS_DRAGONFLYBSD
 127         COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_DRAGONFLYBSD"
 128         PLATFORM_LIBS="-lpthread"
 129         PORT_FILE=port/port_posix.cc
 130         ;;
 131     OS_ANDROID_CROSSCOMPILE)
 132         PLATFORM=OS_ANDROID
 133         COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_ANDROID -DLEVELDB_PLATFORM_POSIX"
 134         PLATFORM_LDFLAGS=""  # All pthread features are in the Android C library
 135         PORT_FILE=port/port_posix.cc
 136         CROSS_COMPILE=true
 137         ;;
 138     HP-UX)
 139         PLATFORM=OS_HPUX
 140         COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_HPUX"
 141         PLATFORM_LDFLAGS="-pthread"
 142         PORT_FILE=port/port_posix.cc
 143         # man ld: +h internal_name
 144         PLATFORM_SHARED_LDFLAGS="-shared -Wl,+h -Wl,"
 145         ;;
 146     IOS)
 147         PLATFORM=IOS
 148         COMMON_FLAGS="$MEMCMP_FLAG -DOS_MACOSX"
 149         [ -z "$INSTALL_PATH" ] && INSTALL_PATH=`pwd`
 150         PORT_FILE=port/port_posix.cc
 151         PLATFORM_SHARED_EXT=
 152         PLATFORM_SHARED_LDFLAGS=
 153         PLATFORM_SHARED_CFLAGS=
 154         PLATFORM_SHARED_VERSIONED=
 155         ;;
 156     OS_WINDOWS_CROSSCOMPILE | NATIVE_WINDOWS)
 157         PLATFORM=OS_WINDOWS
 158         COMMON_FLAGS="-fno-builtin-memcmp -D_REENTRANT -DOS_WINDOWS -DLEVELDB_PLATFORM_WINDOWS -DWINVER=0x0500 -D__USE_MINGW_ANSI_STDIO=1"
 159         PLATFORM_SOURCES="util/env_win.cc"
 160         PLATFORM_LIBS="-lshlwapi"
 161         PORT_FILE=port/port_win.cc
 162         CROSS_COMPILE=true
 163         ;;
 164     *)
 165         echo "Unknown platform!" >&2
 166         exit 1
 167 esac
 168
 169 # We want to make a list of all cc files within util, db, table, and helpers
 170 # except for the test and benchmark files. By default, find will output a list
 171 # of all files matching either rule, so we need to append -print to make the
 172 # prune take effect.
 173 DIRS="$PREFIX/db $PREFIX/util $PREFIX/table"
 174
 175 set -f # temporarily disable globbing so that our patterns aren't expanded
 176 PRUNE_TEST="-name *test*.cc -prune"
 177 PRUNE_BENCH="-name *_bench.cc -prune"
 178 PRUNE_TOOL="-name leveldb_main.cc -prune"
 179 PORTABLE_FILES=`find $DIRS $PRUNE_TEST -o $PRUNE_BENCH -o $PRUNE_TOOL -o -name '*.cc' -print | sort | sed "s,^$PREFIX/,," | tr "\n" " "`
 180
 181 set +f # re-enable globbing
 182
 183 # The sources consist of the portable files, plus the platform-specific port
 184 # file.
 185 echo "SOURCES=$PORTABLE_FILES $PORT_FILE" >> $OUTPUT
 186 echo "MEMENV_SOURCES=helpers/memenv/memenv.cc" >> $OUTPUT
 187
 188 if [ "$CROSS_COMPILE" = "true" ]; then
 189     # Cross-compiling; do not try any compilation tests.
 190     true
 191 else
 192     CXXOUTPUT="${TMPDIR}/leveldb_build_detect_platform-cxx.$$"
 193     COMMON_FLAGS="$COMMON_FLAGS -DLEVELDB_PLATFORM_POSIX"
 194
 195     # Test whether tcmalloc is available
 196     $CXX $CXXFLAGS -x c++ - -o $CXXOUTPUT -ltcmalloc 2>/dev/null  <<EOF
 197       int main() {}
 198 EOF
 199     if [ "$?" = 0 ]; then
 200         PLATFORM_LIBS="$PLATFORM_LIBS -ltcmalloc"
 201     fi
 202
 203     rm -f $CXXOUTPUT 2>/dev/null
 204 fi
 205
 206 PLATFORM_CCFLAGS="$PLATFORM_CCFLAGS $COMMON_FLAGS"
 207 PLATFORM_CXXFLAGS="$PLATFORM_CXXFLAGS $COMMON_FLAGS"
 208
 209 echo "CC=$CC" >> $OUTPUT
 210 echo "CXX=$CXX" >> $OUTPUT
 211 echo "PLATFORM=$PLATFORM" >> $OUTPUT
 212 echo "PLATFORM_LDFLAGS=$PLATFORM_LDFLAGS" >> $OUTPUT
 213 echo "PLATFORM_LIBS=$PLATFORM_LIBS" >> $OUTPUT
 214 echo "PLATFORM_CCFLAGS=$PLATFORM_CCFLAGS" >> $OUTPUT
 215 echo "PLATFORM_CXXFLAGS=$PLATFORM_CXXFLAGS" >> $OUTPUT
 216 echo "PLATFORM_SHARED_CFLAGS=$PLATFORM_SHARED_CFLAGS" >> $OUTPUT
 217 echo "PLATFORM_SHARED_EXT=$PLATFORM_SHARED_EXT" >> $OUTPUT
 218 echo "PLATFORM_SHARED_LDFLAGS=$PLATFORM_SHARED_LDFLAGS" >> $OUTPUT
 219 echo "PLATFORM_SHARED_VERSIONED=$PLATFORM_SHARED_VERSIONED" >> $OUTPUT