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262 righe
8.5 KiB
262 righe
8.5 KiB
#!/bin/sh
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#
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# Detects OS we're compiling on and outputs a file specified by the first
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# argument, which in turn gets read while processing Makefile.
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#
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# The output will set the following variables:
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# CC C Compiler path
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# CXX C++ Compiler path
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# PLATFORM_LDFLAGS Linker flags
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# PLATFORM_LIBS Libraries flags
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# PLATFORM_SHARED_EXT Extension for shared libraries
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# PLATFORM_SHARED_LDFLAGS Flags for building shared library
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# This flag is embedded just before the name
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# of the shared library without intervening spaces
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# PLATFORM_SHARED_CFLAGS Flags for compiling objects for shared library
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# PLATFORM_CCFLAGS C compiler flags
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# PLATFORM_CXXFLAGS C++ compiler flags. Will contain:
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# PLATFORM_SHARED_VERSIONED Set to 'true' if platform supports versioned
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# shared libraries, empty otherwise.
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#
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# The PLATFORM_CCFLAGS and PLATFORM_CXXFLAGS might include the following:
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#
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# -DLEVELDB_ATOMIC_PRESENT if <atomic> is present
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# -DLEVELDB_PLATFORM_POSIX=1 for Posix-based platforms
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# -DHAVE_CRC32C=1 if the CRC32C library is present
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# -DHAVE_SNAPPY=1 if the Snappy library is present
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#
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OUTPUT=$1
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PREFIX=$2
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if test -z "$OUTPUT" || test -z "$PREFIX"; then
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echo "usage: $0 <output-filename> <directory_prefix>" >&2
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exit 1
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fi
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# Delete existing output, if it exists
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rm -f $OUTPUT
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touch $OUTPUT
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if test -z "$CC"; then
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CC=cc
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fi
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if test -z "$CXX"; then
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CXX=g++
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fi
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if test -z "$TMPDIR"; then
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TMPDIR=/tmp
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fi
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# Detect OS
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if test -z "$TARGET_OS"; then
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TARGET_OS=`uname -s`
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fi
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COMMON_FLAGS=
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CROSS_COMPILE=
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PLATFORM_CCFLAGS=
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PLATFORM_CXXFLAGS=
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PLATFORM_LDFLAGS=
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PLATFORM_LIBS=
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PLATFORM_SHARED_EXT="so"
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PLATFORM_SHARED_LDFLAGS="-shared -Wl,-soname -Wl,"
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PLATFORM_SHARED_CFLAGS="-fPIC -fvisibility=hidden"
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PLATFORM_SHARED_VERSIONED=true
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MEMCMP_FLAG=
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if [ "$CXX" = "g++" ]; then
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# Use libc's memcmp instead of GCC's memcmp. This results in ~40%
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# performance improvement on readrandom under gcc 4.4.3 on Linux/x86.
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MEMCMP_FLAG="-fno-builtin-memcmp"
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fi
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case "$TARGET_OS" in
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CYGWIN_*)
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PLATFORM=OS_LINUX
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COMMON_FLAGS="$MEMCMP_FLAG -lpthread -DOS_LINUX -DCYGWIN"
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PLATFORM_LDFLAGS="-lpthread"
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PORT_FILE=port/port_posix.cc
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;;
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Darwin)
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PLATFORM=OS_MACOSX
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COMMON_FLAGS="$MEMCMP_FLAG"
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PLATFORM_SHARED_EXT=dylib
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[ -z "$INSTALL_PATH" ] && INSTALL_PATH=`pwd`
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PLATFORM_SHARED_LDFLAGS="-dynamiclib -install_name $INSTALL_PATH/"
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PORT_FILE=port/port_posix.cc
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;;
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Linux)
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PLATFORM=OS_LINUX
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COMMON_FLAGS="$MEMCMP_FLAG -pthread -DOS_LINUX"
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PLATFORM_LDFLAGS="-pthread"
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PORT_FILE=port/port_posix.cc
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;;
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SunOS)
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PLATFORM=OS_SOLARIS
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COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_SOLARIS"
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PLATFORM_LIBS="-lpthread -lrt"
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PORT_FILE=port/port_posix.cc
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;;
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FreeBSD)
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PLATFORM=OS_FREEBSD
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COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_FREEBSD"
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PLATFORM_LIBS="-lpthread"
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PORT_FILE=port/port_posix.cc
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;;
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NetBSD)
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PLATFORM=OS_NETBSD
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COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_NETBSD"
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PLATFORM_LIBS="-lpthread -lgcc_s"
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PORT_FILE=port/port_posix.cc
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;;
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OpenBSD)
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PLATFORM=OS_OPENBSD
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COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_OPENBSD"
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PLATFORM_LDFLAGS="-pthread"
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PORT_FILE=port/port_posix.cc
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;;
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DragonFly)
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PLATFORM=OS_DRAGONFLYBSD
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COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_DRAGONFLYBSD"
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PLATFORM_LIBS="-lpthread"
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PORT_FILE=port/port_posix.cc
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;;
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OS_ANDROID_CROSSCOMPILE)
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PLATFORM=OS_ANDROID
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COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_ANDROID -DLEVELDB_PLATFORM_POSIX=1"
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PLATFORM_LDFLAGS="" # All pthread features are in the Android C library
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PORT_FILE=port/port_posix.cc
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CROSS_COMPILE=true
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;;
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HP-UX)
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PLATFORM=OS_HPUX
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COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_HPUX"
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PLATFORM_LDFLAGS="-pthread"
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PORT_FILE=port/port_posix.cc
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# man ld: +h internal_name
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PLATFORM_SHARED_LDFLAGS="-shared -Wl,+h -Wl,"
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;;
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IOS)
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PLATFORM=IOS
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COMMON_FLAGS="$MEMCMP_FLAG"
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[ -z "$INSTALL_PATH" ] && INSTALL_PATH=`pwd`
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PORT_FILE=port/port_posix.cc
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PLATFORM_SHARED_EXT=
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PLATFORM_SHARED_LDFLAGS=
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PLATFORM_SHARED_CFLAGS=
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PLATFORM_SHARED_VERSIONED=
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;;
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*)
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echo "Unknown platform!" >&2
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exit 1
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esac
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# We want to make a list of all cc files within util, db, table, and helpers
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# except for the test and benchmark files. By default, find will output a list
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# of all files matching either rule, so we need to append -print to make the
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# prune take effect.
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DIRS="$PREFIX/db $PREFIX/util $PREFIX/table"
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set -f # temporarily disable globbing so that our patterns aren't expanded
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PRUNE_TEST="-name *test*.cc -prune"
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PRUNE_BENCH="-name *_bench.cc -prune"
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PRUNE_TOOL="-name leveldbutil.cc -prune"
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PORTABLE_FILES=`find $DIRS $PRUNE_TEST -o $PRUNE_BENCH -o $PRUNE_TOOL -o -name '*.cc' -print | sort | sed "s,^$PREFIX/,," | tr "\n" " "`
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set +f # re-enable globbing
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# The sources consist of the portable files, plus the platform-specific port
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# file.
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echo "SOURCES=$PORTABLE_FILES $PORT_FILE" >> $OUTPUT
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echo "MEMENV_SOURCES=helpers/memenv/memenv.cc" >> $OUTPUT
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if [ "$CROSS_COMPILE" = "true" ]; then
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# Cross-compiling; do not try any compilation tests.
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true
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else
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CXXOUTPUT="${TMPDIR}/leveldb_build_detect_platform-cxx.$$"
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# If -std=c++0x works, use <atomic> as fallback for when memory barriers
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# are not available.
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$CXX $CXXFLAGS -std=c++0x -x c++ - -o $CXXOUTPUT 2>/dev/null <<EOF
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#include <atomic>
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int main() {}
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EOF
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if [ "$?" = 0 ]; then
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COMMON_FLAGS="$COMMON_FLAGS -DLEVELDB_PLATFORM_POSIX=1 -DLEVELDB_ATOMIC_PRESENT"
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PLATFORM_CXXFLAGS="-std=c++0x"
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else
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COMMON_FLAGS="$COMMON_FLAGS -DLEVELDB_PLATFORM_POSIX=1"
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fi
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# Test whether CRC32C library is installed
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# https://github.com/google/crc32c
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$CXX $CXXFLAGS -x c++ - -o $CXXOUTPUT 2>/dev/null <<EOF
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#include <crc32c/crc32c.h>
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int main() {}
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EOF
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if [ "$?" = 0 ]; then
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COMMON_FLAGS="$COMMON_FLAGS -DHAVE_CRC32C=1"
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PLATFORM_LIBS="$PLATFORM_LIBS -lcrc32c"
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else
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COMMON_FLAGS="$COMMON_FLAGS -DHAVE_CRC32C=0"
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fi
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# Test whether Snappy library is installed
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# https://github.com/google/snappy
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$CXX $CXXFLAGS -x c++ - -o $CXXOUTPUT 2>/dev/null <<EOF
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#include <snappy.h>
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int main() {}
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EOF
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if [ "$?" = 0 ]; then
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COMMON_FLAGS="$COMMON_FLAGS -DHAVE_SNAPPY=1"
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PLATFORM_LIBS="$PLATFORM_LIBS -lsnappy"
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else
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COMMON_FLAGS="$COMMON_FLAGS -DHAVE_SNAPPY=0"
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fi
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# Test whether tcmalloc is available
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$CXX $CXXFLAGS -x c++ - -o $CXXOUTPUT -ltcmalloc 2>/dev/null <<EOF
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int main() {}
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EOF
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if [ "$?" = 0 ]; then
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PLATFORM_LIBS="$PLATFORM_LIBS -ltcmalloc"
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fi
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# Test whether -Wthread-safety is available. See
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# https://clang.llvm.org/docs/ThreadSafetyAnalysis.html
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# -Werror is necessary because unknown attributes only generate warnings.
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$CXX $CXXFLAGS -Wthread-safety -Werror -x c++ - -o $CXXOUTPUT 2>/dev/null <<EOF
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struct __attribute__((lockable)) Lock {
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void Acquire() __attribute__((exclusive_lock_function()));
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void Release() __attribute__((unlock_function()));
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};
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struct ThreadSafeType {
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Lock lock_;
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int data_ __attribute__((guarded_by(lock_)));
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};
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int main() { return 0; }
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EOF
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if [ "$?" = 0 ]; then
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COMMON_FLAGS="$COMMON_FLAGS -Wthread-safety"
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fi
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rm -f $CXXOUTPUT 2>/dev/null
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fi
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PLATFORM_CCFLAGS="$PLATFORM_CCFLAGS $COMMON_FLAGS"
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PLATFORM_CXXFLAGS="$PLATFORM_CXXFLAGS $COMMON_FLAGS"
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echo "CC=$CC" >> $OUTPUT
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echo "CXX=$CXX" >> $OUTPUT
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echo "PLATFORM=$PLATFORM" >> $OUTPUT
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echo "PLATFORM_LDFLAGS=$PLATFORM_LDFLAGS" >> $OUTPUT
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echo "PLATFORM_LIBS=$PLATFORM_LIBS" >> $OUTPUT
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echo "PLATFORM_CCFLAGS=$PLATFORM_CCFLAGS" >> $OUTPUT
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echo "PLATFORM_CXXFLAGS=$PLATFORM_CXXFLAGS" >> $OUTPUT
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echo "PLATFORM_SHARED_CFLAGS=$PLATFORM_SHARED_CFLAGS" >> $OUTPUT
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echo "PLATFORM_SHARED_EXT=$PLATFORM_SHARED_EXT" >> $OUTPUT
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echo "PLATFORM_SHARED_LDFLAGS=$PLATFORM_SHARED_LDFLAGS" >> $OUTPUT
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echo "PLATFORM_SHARED_VERSIONED=$PLATFORM_SHARED_VERSIONED" >> $OUTPUT
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