adbe3eb073
1. Object files, libraries, and compiled executables are put into subdirectories. 2. The shared library is linked from individual object files. This provides for greater parallelism on large desktops while at the same time making for easier builds on small (i.e. embedded) systems. Fixes issue #279. 3. One program, db_bench, is compiled using the shared library. 4. The source file for "leveldbutil" was renamed from leveldb_main.cc to leveldbutil.cc. This provides for simpler makefile rules. 5. Because all targets placed the library (libleveldb.a) at the top level, the last platform built (desktop/device) always overwrote any prior artifact. ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=113407013
229 lines
7.3 KiB
Bash
Executable File
229 lines
7.3 KiB
Bash
Executable File
#!/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 for Posix-based platforms
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# -DSNAPPY 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 "$TARGET_OS"; then
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TARGET_OS=`uname -s`
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fi
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COMMON_FLAGS=
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CROSS_COMPILE=
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PLATFORM_CCFLAGS=
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PLATFORM_CXXFLAGS=
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PLATFORM_LDFLAGS=
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PLATFORM_LIBS=
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PLATFORM_SHARED_EXT="so"
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PLATFORM_SHARED_LDFLAGS="-shared -Wl,-soname -Wl,"
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PLATFORM_SHARED_CFLAGS="-fPIC"
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PLATFORM_SHARED_VERSIONED=true
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MEMCMP_FLAG=
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if [ "$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="$MEMCMP_FLAG -DOS_MACOSX"
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PLATFORM_SHARED_EXT=dylib
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[ -z "$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"
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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 -DOS_MACOSX"
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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="$COMMON_FLAGS -DLEVELDB_PLATFORM_POSIX -DLEVELDB_ATOMIC_PRESENT"
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PLATFORM_CXXFLAGS="-std=c++0x"
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else
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COMMON_FLAGS="$COMMON_FLAGS -DLEVELDB_PLATFORM_POSIX"
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fi
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# Test whether Snappy library is installed
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# http://code.google.com/p/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="$COMMON_FLAGS -DSNAPPY"
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PLATFORM_LIBS="$PLATFORM_LIBS -lsnappy"
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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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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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