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 "$TARGET_OS"; then
  53     TARGET_OS=`uname -s`
  54 fi
  55
  56 COMMON_FLAGS=
  57 CROSS_COMPILE=
  58 PLATFORM_CCFLAGS=
  59 PLATFORM_CXXFLAGS=
  60 PLATFORM_LDFLAGS=
  61 PLATFORM_LIBS=
  62 PLATFORM_SHARED_EXT="so"
  63 PLATFORM_SHARED_LDFLAGS="-shared -Wl,-soname -Wl,"
  64 PLATFORM_SHARED_CFLAGS="-fPIC"
  65 PLATFORM_SHARED_VERSIONED=true
  66 PLATFORM_SSEFLAGS=
  67
  68 MEMCMP_FLAG=
  69 if [ "$CXX" = "g++" ]; then
  70     # Use libc's memcmp instead of GCC's memcmp.  This results in ~40%
  71     # performance improvement on readrandom under gcc 4.4.3 on Linux/x86.
  72     MEMCMP_FLAG="-fno-builtin-memcmp"
  73 fi
  74
  75 case "$TARGET_OS" in
  76     CYGWIN_*)
  77         PLATFORM=OS_LINUX
  78         COMMON_FLAGS="$MEMCMP_FLAG -lpthread -DOS_LINUX -DCYGWIN"
  79         PLATFORM_LDFLAGS="-lpthread"
  80         PORT_FILE=port/port_posix.cc
  81         PORT_SSE_FILE=port/port_posix_sse.cc
  82         ;;
  83     Darwin)
  84         PLATFORM=OS_MACOSX
  85         COMMON_FLAGS="$MEMCMP_FLAG -DOS_MACOSX"
  86         PLATFORM_SHARED_EXT=dylib
  87         [ -z "$INSTALL_PATH" ] && INSTALL_PATH=`pwd`
  88         PLATFORM_SHARED_LDFLAGS="-dynamiclib -install_name $INSTALL_PATH/"
  89         PORT_FILE=port/port_posix.cc
  90         PORT_SSE_FILE=port/port_posix_sse.cc
  91         ;;
  92     Linux)
  93         PLATFORM=OS_LINUX
  94         COMMON_FLAGS="$MEMCMP_FLAG -pthread -DOS_LINUX"
  95         PLATFORM_LDFLAGS="-pthread"
  96         PORT_FILE=port/port_posix.cc
  97         PORT_SSE_FILE=port/port_posix_sse.cc
  98         ;;
  99     SunOS)
 100         PLATFORM=OS_SOLARIS
 101         COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_SOLARIS"
 102         PLATFORM_LIBS="-lpthread -lrt"
 103         PORT_FILE=port/port_posix.cc
 104         PORT_SSE_FILE=port/port_posix_sse.cc
 105         ;;
 106     FreeBSD)
 107         PLATFORM=OS_FREEBSD
 108         COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_FREEBSD"
 109         PLATFORM_LIBS="-lpthread"
 110         PORT_FILE=port/port_posix.cc
 111         PORT_SSE_FILE=port/port_posix_sse.cc
 112         ;;
 113     GNU/kFreeBSD)
 114         PLATFORM=OS_KFREEBSD
 115         COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_KFREEBSD"
 116         PLATFORM_LIBS="-lpthread"
 117         PORT_FILE=port/port_posix.cc
 118         ;;
 119     NetBSD)
 120         PLATFORM=OS_NETBSD
 121         COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_NETBSD"
 122         PLATFORM_LIBS="-lpthread -lgcc_s"
 123         PORT_FILE=port/port_posix.cc
 124         PORT_SSE_FILE=port/port_posix_sse.cc
 125         ;;
 126     OpenBSD)
 127         PLATFORM=OS_OPENBSD
 128         COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_OPENBSD"
 129         PLATFORM_LDFLAGS="-pthread"
 130         PORT_FILE=port/port_posix.cc
 131         PORT_SSE_FILE=port/port_posix_sse.cc
 132         ;;
 133     DragonFly)
 134         PLATFORM=OS_DRAGONFLYBSD
 135         COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_DRAGONFLYBSD"
 136         PLATFORM_LIBS="-lpthread"
 137         PORT_FILE=port/port_posix.cc
 138         PORT_SSE_FILE=port/port_posix_sse.cc
 139         ;;
 140     OS_ANDROID_CROSSCOMPILE)
 141         PLATFORM=OS_ANDROID
 142         COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_ANDROID -DLEVELDB_PLATFORM_POSIX"
 143         PLATFORM_LDFLAGS=""  # All pthread features are in the Android C library
 144         PORT_FILE=port/port_posix.cc
 145         PORT_SSE_FILE=port/port_posix_sse.cc
 146         CROSS_COMPILE=true
 147         ;;
 148     HP-UX)
 149         PLATFORM=OS_HPUX
 150         COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_HPUX"
 151         PLATFORM_LDFLAGS="-pthread"
 152         PORT_FILE=port/port_posix.cc
 153         PORT_SSE_FILE=port/port_posix_sse.cc
 154         # man ld: +h internal_name
 155         PLATFORM_SHARED_LDFLAGS="-shared -Wl,+h -Wl,"
 156         ;;
 157     IOS)
 158         PLATFORM=IOS
 159         COMMON_FLAGS="$MEMCMP_FLAG -DOS_MACOSX"
 160         [ -z "$INSTALL_PATH" ] && INSTALL_PATH=`pwd`
 161         PORT_FILE=port/port_posix.cc
 162         PORT_SSE_FILE=port/port_posix_sse.cc
 163         PLATFORM_SHARED_EXT=
 164         PLATFORM_SHARED_LDFLAGS=
 165         PLATFORM_SHARED_CFLAGS=
 166         PLATFORM_SHARED_VERSIONED=
 167         ;;
 168     OS_WINDOWS_CROSSCOMPILE | NATIVE_WINDOWS)
 169         PLATFORM=OS_WINDOWS
 170         COMMON_FLAGS="-fno-builtin-memcmp -D_REENTRANT -DOS_WINDOWS -DLEVELDB_PLATFORM_WINDOWS -DWINVER=0x0500 -D__USE_MINGW_ANSI_STDIO=1"
 171         PLATFORM_SOURCES="util/env_win.cc"
 172         PLATFORM_LIBS="-lshlwapi"
 173         PORT_FILE=port/port_win.cc
 174         CROSS_COMPILE=true
 175         ;;
 176     *)
 177         echo "Unknown platform!" >&2
 178         exit 1
 179 esac
 180
 181 # We want to make a list of all cc files within util, db, table, and helpers
 182 # except for the test and benchmark files. By default, find will output a list
 183 # of all files matching either rule, so we need to append -print to make the
 184 # prune take effect.
 185 DIRS="$PREFIX/db $PREFIX/util $PREFIX/table"
 186
 187 set -f # temporarily disable globbing so that our patterns aren't expanded
 188 PRUNE_TEST="-name *test*.cc -prune"
 189 PRUNE_BENCH="-name *_bench.cc -prune"
 190 PRUNE_TOOL="-name leveldbutil.cc -prune"
 191 PORTABLE_FILES=`find $DIRS $PRUNE_TEST -o $PRUNE_BENCH -o $PRUNE_TOOL -o -name '*.cc' -print | sort | sed "s,^$PREFIX/,," | tr "\n" " "`
 192
 193 set +f # re-enable globbing
 194
 195 # The sources consist of the portable files, plus the platform-specific port
 196 # file.
 197 echo "SOURCES=$PORTABLE_FILES $PORT_FILE $PORT_SSE_FILE" >> $OUTPUT
 198 echo "MEMENV_SOURCES=helpers/memenv/memenv.cc" >> $OUTPUT
 199
 200 if [ "$CROSS_COMPILE" = "true" ]; then
 201     # Cross-compiling; do not try any compilation tests.
 202     true
 203 else
 204     CXXOUTPUT="${TMPDIR}/leveldb_build_detect_platform-cxx.$$"
 205
 206     # If -std=c++0x works, use <atomic> as fallback for when memory barriers
 207     # are not available.
 208     $CXX $CXXFLAGS -std=c++0x -x c++ - -o $CXXOUTPUT 2>/dev/null  <<EOF
 209       #include <atomic>
 210       int main() {}
 211 EOF
 212     if [ "$?" = 0 ]; then
 213         COMMON_FLAGS="$COMMON_FLAGS -DLEVELDB_PLATFORM_POSIX -DLEVELDB_ATOMIC_PRESENT"
 214         PLATFORM_CXXFLAGS="-std=c++0x"
 215     else
 216         COMMON_FLAGS="$COMMON_FLAGS -DLEVELDB_PLATFORM_POSIX"
 217     fi
 218
 219     # Test whether tcmalloc is available
 220     $CXX $CXXFLAGS -x c++ - -o $CXXOUTPUT -ltcmalloc 2>/dev/null  <<EOF
 221       int main() {}
 222 EOF
 223     if [ "$?" = 0 ]; then
 224         PLATFORM_LIBS="$PLATFORM_LIBS -ltcmalloc"
 225     fi
 226
 227     rm -f $CXXOUTPUT 2>/dev/null
 228
 229     # Test if gcc SSE 4.2 is supported
 230     $CXX $CXXFLAGS -x c++ - -o $CXXOUTPUT -msse4.2 2>/dev/null  <<EOF
 231       int main() {}
 232 EOF
 233     if [ "$?" = 0 ]; then
 234         PLATFORM_SSEFLAGS="-msse4.2"
 235     fi
 236
 237     rm -f $CXXOUTPUT 2>/dev/null
 238 fi
 239
 240 # Use the SSE 4.2 CRC32C intrinsics iff runtime checks indicate compiler supports them.
 241 if [ -n "$PLATFORM_SSEFLAGS" ]; then
 242     PLATFORM_SSEFLAGS="$PLATFORM_SSEFLAGS -DLEVELDB_PLATFORM_POSIX_SSE"
 243 fi
 244
 245 PLATFORM_CCFLAGS="$PLATFORM_CCFLAGS $COMMON_FLAGS"
 246 PLATFORM_CXXFLAGS="$PLATFORM_CXXFLAGS $COMMON_FLAGS"
 247
 248 echo "CC=$CC" >> $OUTPUT
 249 echo "CXX=$CXX" >> $OUTPUT
 250 echo "PLATFORM=$PLATFORM" >> $OUTPUT
 251 echo "PLATFORM_LDFLAGS=$PLATFORM_LDFLAGS" >> $OUTPUT
 252 echo "PLATFORM_LIBS=$PLATFORM_LIBS" >> $OUTPUT
 253 echo "PLATFORM_CCFLAGS=$PLATFORM_CCFLAGS" >> $OUTPUT
 254 echo "PLATFORM_CXXFLAGS=$PLATFORM_CXXFLAGS" >> $OUTPUT
 255 echo "PLATFORM_SSEFLAGS=$PLATFORM_SSEFLAGS" >> $OUTPUT
 256 echo "PLATFORM_SHARED_CFLAGS=$PLATFORM_SHARED_CFLAGS" >> $OUTPUT
 257 echo "PLATFORM_SHARED_EXT=$PLATFORM_SHARED_EXT" >> $OUTPUT
 258 echo "PLATFORM_SHARED_LDFLAGS=$PLATFORM_SHARED_LDFLAGS" >> $OUTPUT
 259 echo "PLATFORM_SHARED_VERSIONED=$PLATFORM_SHARED_VERSIONED" >> $OUTPUT