xref: /leveldb-1.20/build_detect_platform (revision 0b9a89f4) 
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 "$CXX"; then
44    CXX=g++
45fi
46
47if test -z "$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 "$TARGET_OS" in
75    Darwin)
76        PLATFORM=OS_MACOSX
77        COMMON_FLAGS="$MEMCMP_FLAG -DOS_MACOSX"
78        PLATFORM_SHARED_EXT=dylib
79        [ -z "$INSTALL_PATH" ] && INSTALL_PATH=`pwd`
80        PLATFORM_SHARED_LDFLAGS="-dynamiclib -install_name $INSTALL_PATH/"
81        PORT_FILE=port/port_posix.cc
82        ;;
83    Linux)
84        PLATFORM=OS_LINUX
85        COMMON_FLAGS="$MEMCMP_FLAG -pthread -DOS_LINUX"
86        PLATFORM_LDFLAGS="-pthread"
87        PORT_FILE=port/port_posix.cc
88        ;;
89    SunOS)
90        PLATFORM=OS_SOLARIS
91        COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_SOLARIS"
92        PLATFORM_LIBS="-lpthread -lrt"
93        PORT_FILE=port/port_posix.cc
94        ;;
95    FreeBSD)
96        PLATFORM=OS_FREEBSD
97        COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_FREEBSD"
98        PLATFORM_LIBS="-lpthread"
99        PORT_FILE=port/port_posix.cc
100        ;;
101    NetBSD)
102        PLATFORM=OS_NETBSD
103        COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_NETBSD"
104        PLATFORM_LIBS="-lpthread -lgcc_s"
105        PORT_FILE=port/port_posix.cc
106        ;;
107    OpenBSD)
108        PLATFORM=OS_OPENBSD
109        COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_OPENBSD"
110        PLATFORM_LDFLAGS="-pthread"
111        PORT_FILE=port/port_posix.cc
112        ;;
113    DragonFly)
114        PLATFORM=OS_DRAGONFLYBSD
115        COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_DRAGONFLYBSD"
116        PLATFORM_LIBS="-lpthread"
117        PORT_FILE=port/port_posix.cc
118        ;;
119    OS_ANDROID_CROSSCOMPILE)
120        PLATFORM=OS_ANDROID
121        COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_ANDROID -DLEVELDB_PLATFORM_POSIX"
122        PLATFORM_LDFLAGS=""  # All pthread features are in the Android C library
123        PORT_FILE=port/port_posix.cc
124        CROSS_COMPILE=true
125        ;;
126    HP-UX)
127        PLATFORM=OS_HPUX
128        COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_HPUX"
129        PLATFORM_LDFLAGS="-pthread"
130        PORT_FILE=port/port_posix.cc
131        # man ld: +h internal_name
132        PLATFORM_SHARED_LDFLAGS="-shared -Wl,+h -Wl,"
133        ;;
134    *)
135        echo "Unknown platform!" >&2
136        exit 1
137esac
138
139# We want to make a list of all cc files within util, db, table, and helpers
140# except for the test and benchmark files. By default, find will output a list
141# of all files matching either rule, so we need to append -print to make the
142# prune take effect.
143DIRS="$PREFIX/db $PREFIX/util $PREFIX/table"
144
145set -f # temporarily disable globbing so that our patterns aren't expanded
146PRUNE_TEST="-name *test*.cc -prune"
147PRUNE_BENCH="-name *_bench.cc -prune"
148PRUNE_TOOL="-name leveldb_main.cc -prune"
149PORTABLE_FILES=`find $DIRS $PRUNE_TEST -o $PRUNE_BENCH -o $PRUNE_TOOL -o -name '*.cc' -print | sort | sed "s,^$PREFIX/,," | tr "\n" " "`
150
151set +f # re-enable globbing
152
153# The sources consist of the portable files, plus the platform-specific port
154# file.
155echo "SOURCES=$PORTABLE_FILES $PORT_FILE" >> $OUTPUT
156echo "MEMENV_SOURCES=helpers/memenv/memenv.cc" >> $OUTPUT
157
158if [ "$CROSS_COMPILE" = "true" ]; then
159    # Cross-compiling; do not try any compilation tests.
160    true
161else
162    CXXOUTPUT="${TMPDIR}/leveldb_build_detect_platform-cxx.$$"
163
164    # If -std=c++0x works, use <cstdatomic>.  Otherwise use port_posix.h.
165    $CXX $CXXFLAGS -std=c++0x -x c++ - -o $CXXOUTPUT 2>/dev/null  <<EOF
166      #include <cstdatomic>
167      int main() {}
168EOF
169    if [ "$?" = 0 ]; then
170        COMMON_FLAGS="$COMMON_FLAGS -DLEVELDB_PLATFORM_POSIX -DLEVELDB_CSTDATOMIC_PRESENT"
171        PLATFORM_CXXFLAGS="-std=c++0x"
172    else
173        COMMON_FLAGS="$COMMON_FLAGS -DLEVELDB_PLATFORM_POSIX"
174    fi
175
176    # Test whether Snappy library is installed
177    # http://code.google.com/p/snappy/
178    $CXX $CXXFLAGS -x c++ - -o $CXXOUTPUT 2>/dev/null  <<EOF
179      #include <snappy.h>
180      int main() {}
181EOF
182    if [ "$?" = 0 ]; then
183        COMMON_FLAGS="$COMMON_FLAGS -DSNAPPY"
184        PLATFORM_LIBS="$PLATFORM_LIBS -lsnappy"
185    fi
186
187    # Test whether tcmalloc is available
188    $CXX $CXXFLAGS -x c++ - -o $CXXOUTPUT -ltcmalloc 2>/dev/null  <<EOF
189      int main() {}
190EOF
191    if [ "$?" = 0 ]; then
192        PLATFORM_LIBS="$PLATFORM_LIBS -ltcmalloc"
193    fi
194
195    rm -f $CXXOUTPUT 2>/dev/null
196fi
197
198PLATFORM_CCFLAGS="$PLATFORM_CCFLAGS $COMMON_FLAGS"
199PLATFORM_CXXFLAGS="$PLATFORM_CXXFLAGS $COMMON_FLAGS"
200
201echo "CC=$CC" >> $OUTPUT
202echo "CXX=$CXX" >> $OUTPUT
203echo "PLATFORM=$PLATFORM" >> $OUTPUT
204echo "PLATFORM_LDFLAGS=$PLATFORM_LDFLAGS" >> $OUTPUT
205echo "PLATFORM_LIBS=$PLATFORM_LIBS" >> $OUTPUT
206echo "PLATFORM_CCFLAGS=$PLATFORM_CCFLAGS" >> $OUTPUT
207echo "PLATFORM_CXXFLAGS=$PLATFORM_CXXFLAGS" >> $OUTPUT
208echo "PLATFORM_SHARED_CFLAGS=$PLATFORM_SHARED_CFLAGS" >> $OUTPUT
209echo "PLATFORM_SHARED_EXT=$PLATFORM_SHARED_EXT" >> $OUTPUT
210echo "PLATFORM_SHARED_LDFLAGS=$PLATFORM_SHARED_LDFLAGS" >> $OUTPUT
211echo "PLATFORM_SHARED_VERSIONED=$PLATFORM_SHARED_VERSIONED" >> $OUTPUT
212