xref: /leveldb-1.20/build_detect_platform (revision ea2e9195) 
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_CSTDATOMIC_PRESENT if <cstdatomic> 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 "$CXX"; then
44    CXX=g++
45fi
46
47# Detect OS
48if test -z "$TARGET_OS"; then
49    TARGET_OS=`uname -s`
50fi
51
52COMMON_FLAGS=
53CROSS_COMPILE=
54PLATFORM_CCFLAGS=
55PLATFORM_CXXFLAGS=
56PLATFORM_LDFLAGS=
57PLATFORM_LIBS=
58PLATFORM_SHARED_EXT="so"
59PLATFORM_SHARED_LDFLAGS="-shared -Wl,-soname -Wl,"
60PLATFORM_SHARED_CFLAGS="-fPIC"
61PLATFORM_SHARED_VERSIONED=true
62
63MEMCMP_FLAG=
64if [ "$CXX" = "g++" ]; then
65    # Use libc's memcmp instead of GCC's memcmp.  This results in ~40%
66    # performance improvement on readrandom under gcc 4.4.3 on Linux/x86.
67    MEMCMP_FLAG="-fno-builtin-memcmp"
68fi
69
70case "$TARGET_OS" in
71    Darwin)
72        PLATFORM=OS_MACOSX
73        COMMON_FLAGS="$MEMCMP_FLAG -DOS_MACOSX"
74        PLATFORM_SHARED_EXT=dylib
75        [ -z "$INSTALL_PATH" ] && INSTALL_PATH=`pwd`
76        PLATFORM_SHARED_LDFLAGS="-dynamiclib -install_name $INSTALL_PATH/"
77        PORT_FILE=port/port_posix.cc
78        ;;
79    Linux)
80        PLATFORM=OS_LINUX
81        COMMON_FLAGS="$MEMCMP_FLAG -pthread -DOS_LINUX"
82        PLATFORM_LDFLAGS="-pthread"
83        PORT_FILE=port/port_posix.cc
84        ;;
85    SunOS)
86        PLATFORM=OS_SOLARIS
87        COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_SOLARIS"
88        PLATFORM_LIBS="-lpthread -lrt"
89        PORT_FILE=port/port_posix.cc
90        ;;
91    FreeBSD)
92        PLATFORM=OS_FREEBSD
93        COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_FREEBSD"
94        PLATFORM_LIBS="-lpthread"
95        PORT_FILE=port/port_posix.cc
96        ;;
97    NetBSD)
98        PLATFORM=OS_NETBSD
99        COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_NETBSD"
100        PLATFORM_LIBS="-lpthread -lgcc_s"
101        PORT_FILE=port/port_posix.cc
102        ;;
103    OpenBSD)
104        PLATFORM=OS_OPENBSD
105        COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_OPENBSD"
106        PLATFORM_LDFLAGS="-pthread"
107        PORT_FILE=port/port_posix.cc
108        ;;
109    DragonFly)
110        PLATFORM=OS_DRAGONFLYBSD
111        COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_DRAGONFLYBSD"
112        PLATFORM_LIBS="-lpthread"
113        PORT_FILE=port/port_posix.cc
114        ;;
115    OS_ANDROID_CROSSCOMPILE)
116        PLATFORM=OS_ANDROID
117        COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_ANDROID -DLEVELDB_PLATFORM_POSIX"
118        PLATFORM_LDFLAGS=""  # All pthread features are in the Android C library
119        PORT_FILE=port/port_posix.cc
120        CROSS_COMPILE=true
121        ;;
122    HP-UX)
123        PLATFORM=OS_HPUX
124        COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_HPUX"
125        PLATFORM_LDFLAGS="-pthread"
126        PORT_FILE=port/port_posix.cc
127        # man ld: +h internal_name
128        PLATFORM_SHARED_LDFLAGS="-shared -Wl,+h -Wl,"
129        ;;
130    *)
131        echo "Unknown platform!" >&2
132        exit 1
133esac
134
135# We want to make a list of all cc files within util, db, table, and helpers
136# except for the test and benchmark files. By default, find will output a list
137# of all files matching either rule, so we need to append -print to make the
138# prune take effect.
139DIRS="$PREFIX/db $PREFIX/util $PREFIX/table"
140
141set -f # temporarily disable globbing so that our patterns aren't expanded
142PRUNE_TEST="-name *test*.cc -prune"
143PRUNE_BENCH="-name *_bench.cc -prune"
144PRUNE_TOOL="-name leveldb_main.cc -prune"
145PORTABLE_FILES=`find $DIRS $PRUNE_TEST -o $PRUNE_BENCH -o $PRUNE_TOOL -o -name '*.cc' -print | sort | sed "s,^$PREFIX/,," | tr "\n" " "`
146
147set +f # re-enable globbing
148
149# The sources consist of the portable files, plus the platform-specific port
150# file.
151echo "SOURCES=$PORTABLE_FILES $PORT_FILE" >> $OUTPUT
152echo "MEMENV_SOURCES=helpers/memenv/memenv.cc" >> $OUTPUT
153
154if [ "$CROSS_COMPILE" = "true" ]; then
155    # Cross-compiling; do not try any compilation tests.
156    true
157else
158    # If -std=c++0x works, use <cstdatomic>.  Otherwise use port_posix.h.
159    $CXX $CXXFLAGS -std=c++0x -x c++ - -o /dev/null 2>/dev/null  <<EOF
160      #include <cstdatomic>
161      int main() {}
162EOF
163    if [ "$?" = 0 ]; then
164        COMMON_FLAGS="$COMMON_FLAGS -DLEVELDB_PLATFORM_POSIX -DLEVELDB_CSTDATOMIC_PRESENT"
165        PLATFORM_CXXFLAGS="-std=c++0x"
166    else
167        COMMON_FLAGS="$COMMON_FLAGS -DLEVELDB_PLATFORM_POSIX"
168    fi
169
170    # Test whether Snappy library is installed
171    # http://code.google.com/p/snappy/
172    $CXX $CXXFLAGS -x c++ - -o /dev/null 2>/dev/null  <<EOF
173      #include <snappy.h>
174      int main() {}
175EOF
176    if [ "$?" = 0 ]; then
177        COMMON_FLAGS="$COMMON_FLAGS -DSNAPPY"
178        PLATFORM_LIBS="$PLATFORM_LIBS -lsnappy"
179    fi
180
181    # Test whether tcmalloc is available
182    $CXX $CXXFLAGS -x c++ - -o /dev/null -ltcmalloc 2>/dev/null  <<EOF
183      int main() {}
184EOF
185    if [ "$?" = 0 ]; then
186        PLATFORM_LIBS="$PLATFORM_LIBS -ltcmalloc"
187    fi
188fi
189
190PLATFORM_CCFLAGS="$PLATFORM_CCFLAGS $COMMON_FLAGS"
191PLATFORM_CXXFLAGS="$PLATFORM_CXXFLAGS $COMMON_FLAGS"
192
193echo "CC=$CC" >> $OUTPUT
194echo "CXX=$CXX" >> $OUTPUT
195echo "PLATFORM=$PLATFORM" >> $OUTPUT
196echo "PLATFORM_LDFLAGS=$PLATFORM_LDFLAGS" >> $OUTPUT
197echo "PLATFORM_LIBS=$PLATFORM_LIBS" >> $OUTPUT
198echo "PLATFORM_CCFLAGS=$PLATFORM_CCFLAGS" >> $OUTPUT
199echo "PLATFORM_CXXFLAGS=$PLATFORM_CXXFLAGS" >> $OUTPUT
200echo "PLATFORM_SHARED_CFLAGS=$PLATFORM_SHARED_CFLAGS" >> $OUTPUT
201echo "PLATFORM_SHARED_EXT=$PLATFORM_SHARED_EXT" >> $OUTPUT
202echo "PLATFORM_SHARED_LDFLAGS=$PLATFORM_SHARED_LDFLAGS" >> $OUTPUT
203echo "PLATFORM_SHARED_VERSIONED=$PLATFORM_SHARED_VERSIONED" >> $OUTPUT
204