xref: /leveldb-1.20/build_detect_platform (revision 3080a45b) 
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
28OUTPUT=$1
29PREFIX=$2
30if test -z "$OUTPUT" || test -z "$PREFIX"; then
31  echo "usage: $0 <output-filename> <directory_prefix>" >&2
32  exit 1
33fi
34
35# Delete existing output, if it exists
36rm -f $OUTPUT
37touch $OUTPUT
38
39if test -z "$CC"; then
40    CC=cc
41fi
42
43if test -z "$CXX"; then
44    CXX=g++
45fi
46
47if test -z "$TMPDIR"; then
48    TMPDIR=/tmp
49fi
50
51# Detect OS
52if test -z "$TARGET_OS"; then
53    TARGET_OS=`uname -s`
54fi
55
56COMMON_FLAGS=
57CROSS_COMPILE=
58PLATFORM_CCFLAGS=
59PLATFORM_CXXFLAGS=
60PLATFORM_LDFLAGS=
61PLATFORM_LIBS=
62PLATFORM_SHARED_EXT="so"
63PLATFORM_SHARED_LDFLAGS="-shared -Wl,-soname -Wl,"
64PLATFORM_SHARED_CFLAGS="-fPIC"
65PLATFORM_SHARED_VERSIONED=true
66
67MEMCMP_FLAG=
68if [ "$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"
72fi
73
74case "$TARGET_OS" in
75    CYGWIN_*)
76        PLATFORM=OS_LINUX
77        COMMON_FLAGS="$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    NetBSD)
108        PLATFORM=OS_NETBSD
109        COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_NETBSD"
110        PLATFORM_LIBS="-lpthread -lgcc_s"
111        PORT_FILE=port/port_posix.cc
112        ;;
113    OpenBSD)
114        PLATFORM=OS_OPENBSD
115        COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_OPENBSD"
116        PLATFORM_LDFLAGS="-pthread"
117        PORT_FILE=port/port_posix.cc
118        ;;
119    DragonFly)
120        PLATFORM=OS_DRAGONFLYBSD
121        COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_DRAGONFLYBSD"
122        PLATFORM_LIBS="-lpthread"
123        PORT_FILE=port/port_posix.cc
124        ;;
125    OS_ANDROID_CROSSCOMPILE)
126        PLATFORM=OS_ANDROID
127        COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_ANDROID -DLEVELDB_PLATFORM_POSIX"
128        PLATFORM_LDFLAGS=""  # All pthread features are in the Android C library
129        PORT_FILE=port/port_posix.cc
130        CROSS_COMPILE=true
131        ;;
132    HP-UX)
133        PLATFORM=OS_HPUX
134        COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_HPUX"
135        PLATFORM_LDFLAGS="-pthread"
136        PORT_FILE=port/port_posix.cc
137        # man ld: +h internal_name
138        PLATFORM_SHARED_LDFLAGS="-shared -Wl,+h -Wl,"
139        ;;
140    IOS)
141        PLATFORM=IOS
142        COMMON_FLAGS="$MEMCMP_FLAG -DOS_MACOSX"
143        [ -z "$INSTALL_PATH" ] && INSTALL_PATH=`pwd`
144        PORT_FILE=port/port_posix.cc
145        PLATFORM_SHARED_EXT=
146        PLATFORM_SHARED_LDFLAGS=
147        PLATFORM_SHARED_CFLAGS=
148        PLATFORM_SHARED_VERSIONED=
149        ;;
150    *)
151        echo "Unknown platform!" >&2
152        exit 1
153esac
154
155# We want to make a list of all cc files within util, db, table, and helpers
156# except for the test and benchmark files. By default, find will output a list
157# of all files matching either rule, so we need to append -print to make the
158# prune take effect.
159DIRS="$PREFIX/db $PREFIX/util $PREFIX/table"
160
161set -f # temporarily disable globbing so that our patterns aren't expanded
162PRUNE_TEST="-name *test*.cc -prune"
163PRUNE_BENCH="-name *_bench.cc -prune"
164PRUNE_TOOL="-name leveldbutil.cc -prune"
165PORTABLE_FILES=`find $DIRS $PRUNE_TEST -o $PRUNE_BENCH -o $PRUNE_TOOL -o -name '*.cc' -print | sort | sed "s,^$PREFIX/,," | tr "\n" " "`
166
167set +f # re-enable globbing
168
169# The sources consist of the portable files, plus the platform-specific port
170# file.
171echo "SOURCES=$PORTABLE_FILES $PORT_FILE" >> $OUTPUT
172echo "MEMENV_SOURCES=helpers/memenv/memenv.cc" >> $OUTPUT
173
174if [ "$CROSS_COMPILE" = "true" ]; then
175    # Cross-compiling; do not try any compilation tests.
176    true
177else
178    CXXOUTPUT="${TMPDIR}/leveldb_build_detect_platform-cxx.$$"
179
180    # If -std=c++0x works, use <atomic> as fallback for when memory barriers
181    # are not available.
182    $CXX $CXXFLAGS -std=c++0x -x c++ - -o $CXXOUTPUT 2>/dev/null  <<EOF
183      #include <atomic>
184      int main() {}
185EOF
186    if [ "$?" = 0 ]; then
187        COMMON_FLAGS="$COMMON_FLAGS -DLEVELDB_PLATFORM_POSIX -DLEVELDB_ATOMIC_PRESENT"
188        PLATFORM_CXXFLAGS="-std=c++0x"
189    else
190        COMMON_FLAGS="$COMMON_FLAGS -DLEVELDB_PLATFORM_POSIX"
191    fi
192
193    # Test whether Snappy library is installed
194    # http://code.google.com/p/snappy/
195    $CXX $CXXFLAGS -x c++ - -o $CXXOUTPUT 2>/dev/null  <<EOF
196      #include <snappy.h>
197      int main() {}
198EOF
199    if [ "$?" = 0 ]; then
200        COMMON_FLAGS="$COMMON_FLAGS -DSNAPPY"
201        PLATFORM_LIBS="$PLATFORM_LIBS -lsnappy"
202    fi
203
204    # Test whether tcmalloc is available
205    $CXX $CXXFLAGS -x c++ - -o $CXXOUTPUT -ltcmalloc 2>/dev/null  <<EOF
206      int main() {}
207EOF
208    if [ "$?" = 0 ]; then
209        PLATFORM_LIBS="$PLATFORM_LIBS -ltcmalloc"
210    fi
211
212    rm -f $CXXOUTPUT 2>/dev/null
213fi
214
215PLATFORM_CCFLAGS="$PLATFORM_CCFLAGS $COMMON_FLAGS"
216PLATFORM_CXXFLAGS="$PLATFORM_CXXFLAGS $COMMON_FLAGS"
217
218echo "CC=$CC" >> $OUTPUT
219echo "CXX=$CXX" >> $OUTPUT
220echo "PLATFORM=$PLATFORM" >> $OUTPUT
221echo "PLATFORM_LDFLAGS=$PLATFORM_LDFLAGS" >> $OUTPUT
222echo "PLATFORM_LIBS=$PLATFORM_LIBS" >> $OUTPUT
223echo "PLATFORM_CCFLAGS=$PLATFORM_CCFLAGS" >> $OUTPUT
224echo "PLATFORM_CXXFLAGS=$PLATFORM_CXXFLAGS" >> $OUTPUT
225echo "PLATFORM_SHARED_CFLAGS=$PLATFORM_SHARED_CFLAGS" >> $OUTPUT
226echo "PLATFORM_SHARED_EXT=$PLATFORM_SHARED_EXT" >> $OUTPUT
227echo "PLATFORM_SHARED_LDFLAGS=$PLATFORM_SHARED_LDFLAGS" >> $OUTPUT
228echo "PLATFORM_SHARED_VERSIONED=$PLATFORM_SHARED_VERSIONED" >> $OUTPUT
229