xref: /leveldb-1.20/build_detect_platform (revision a1ad4d19) 
1#!/bin/sh
2#
3# Detects OS we're compiling on and generates build_config.mk,
4# which in turn gets read while processing Makefile.
5#
6# build_config.mk will set the following variables:
7#   PLATFORM_LDFLAGS            Linker flags
8#   PLATFORM_CCFLAGS            C compiler flags
9#   PLATFORM_CXXFLAGS           C++ compiler flags.  Will contain:
10#       -DLEVELDB_PLATFORM_POSIX if cstdatomic is present
11#       -DLEVELDB_PLATFORM_NOATOMIC if it is not
12
13SCRIPT_DIR=`dirname $0`
14
15# Delete existing build_config.mk
16rm -f build_config.mk
17touch build_config.mk
18
19if test -z "$CXX"; then
20    CXX=g++
21fi
22
23# Detect OS
24if test -z "$TARGET_OS"; then
25    TARGET_OS=`uname -s`
26fi
27
28COMMON_FLAGS=
29PLATFORM_CCFLAGS=
30PLATFORM_CXXFLAGS=
31PLATFORM_LDFLAGS=
32
33# On GCC, we pick libc's memcmp over GCC's memcmp via -fno-builtin-memcmp
34case "$TARGET_OS" in
35    Darwin)
36        PLATFORM=OS_MACOSX
37        COMMON_FLAGS="-fno-builtin-memcmp -DOS_MACOSX"
38        PORT_FILE=port/port_posix.cc
39        ;;
40    Linux)
41        PLATFORM=OS_LINUX
42        COMMON_FLAGS="-fno-builtin-memcmp -pthread -DOS_LINUX"
43        PLATFORM_LDFLAGS="-pthread"
44        PORT_FILE=port/port_posix.cc
45        ;;
46    SunOS)
47        PLATFORM=OS_SOLARIS
48        COMMON_FLAGS="-fno-builtin-memcmp -D_REENTRANT -DOS_SOLARIS"
49        PLATFORM_LDFLAGS="-lpthread -lrt"
50        PORT_FILE=port/port_posix.cc
51        ;;
52    FreeBSD)
53        PLATFORM=OS_FREEBSD
54        COMMON_FLAGS="-fno-builtin-memcmp -D_REENTRANT -DOS_FREEBSD"
55        PLATFORM_LDFLAGS="-lpthread"
56        PORT_FILE=port/port_posix.cc
57        ;;
58    NetBSD)
59        PLATFORM=OS_NETBSD
60        COMMON_FLAGS="-fno-builtin-memcmp -D_REENTRANT -DOS_NETBSD"
61        PLATFORM_LDFLAGS="-lpthread -lgcc_s"
62        PORT_FILE=port/port_posix.cc
63        ;;
64    OpenBSD)
65        PLATFORM=OS_OPENBSD
66        COMMON_FLAGS="-fno-builtin-memcmp -D_REENTRANT -DOS_OPENBSD"
67        PLATFORM_LDFLAGS="-pthread"
68        PORT_FILE=port/port_posix.cc
69        ;;
70    DragonFly)
71        PLATFORM=OS_DRAGONFLYBSD
72        COMMON_FLAGS="-fno-builtin-memcmp -D_REENTRANT -DOS_DRAGONFLYBSD"
73        PLATFORM_LDFLAGS="-lpthread"
74        PORT_FILE=port/port_posix.cc
75        ;;
76    OS_ANDROID_CROSSCOMPILE)
77        PLATFORM="$TARGET_OS"
78        COMMON_FLAGS=""
79        PLATFORM_LDFLAGS=""
80        PORT_FILE=port/port_android.cc
81        ;;
82    *)
83        echo "Unknown platform!"
84        exit 1
85esac
86
87# We want to make a list of all cc files within util, db, table, and helpers
88# except for the test and benchmark files. By default, find will output a list
89# of all files matching either rule, so we need to append -print to make the
90# prune take effect.
91DIRS="$SCRIPT_DIR/util $SCRIPT_DIR/db $SCRIPT_DIR/table"
92set -f # temporarily disable globbing so that our patterns aren't expanded
93PRUNE_TEST="-name *test*.cc -prune"
94PRUNE_BENCH="-name *_bench.cc -prune"
95PORTABLE_FILES=`find $DIRS $PRUNE_TEST -o $PRUNE_BENCH -o -name '*.cc' -print | sort | tr "\n" " "`
96set +f # re-enable globbing
97
98# The sources consist of the portable files, plus the platform-specific port
99# file.
100echo "SOURCES=$PORTABLE_FILES $PORT_FILE" >> build_config.mk
101echo "MEMENV_SOURCES=helpers/memenv/memenv.cc" >> build_config.mk
102
103if [ "$PLATFORM" = "OS_ANDROID_CROSSCOMPILE" ]; then
104    # Cross-compiling; do not try any compilation tests.
105    true
106else
107    # If -std=c++0x works, use <cstdatomic>.  Otherwise use port_posix.h.
108    $CXX $CFLAGS -std=c++0x -x c++ - -o /dev/null 2>/dev/null  <<EOF
109      #include <cstdatomic>
110      int main() {}
111EOF
112    if [ "$?" = 0 ]; then
113        COMMON_FLAGS="$COMMON_FLAGS -DLEVELDB_PLATFORM_POSIX -DLEVELDB_CSTDATOMIC_PRESENT"
114        PLATFORM_CXXFLAGS="-std=c++0x"
115    else
116        COMMON_FLAGS="$COMMON_FLAGS -DLEVELDB_PLATFORM_POSIX"
117    fi
118
119    # Test whether Snappy library is installed
120    # http://code.google.com/p/snappy/
121    $CXX $CFLAGS -x c++ - -o /dev/null 2>/dev/null  <<EOF
122      #include <snappy.h>
123      int main() {}
124EOF
125    if [ "$?" = 0 ]; then
126        COMMON_FLAGS="$COMMON_FLAGS -DSNAPPY"
127        PLATFORM_LDFLAGS="$PLATFORM_LDFLAGS -lsnappy"
128    fi
129
130    # Test whether tcmalloc is available
131    $CXX $CFLAGS -x c++ - -o /dev/null -ltcmalloc 2>/dev/null  <<EOF
132      int main() {}
133EOF
134    if [ "$?" = 0 ]; then
135        PLATFORM_LDFLAGS="$PLATFORM_LDFLAGS -ltcmalloc"
136    fi
137fi
138
139PLATFORM_CCFLAGS="$PLATFORM_CCFLAGS $COMMON_FLAGS"
140PLATFORM_CXXFLAGS="$PLATFORM_CXXFLAGS $COMMON_FLAGS"
141
142echo "PLATFORM=$PLATFORM" >> build_config.mk
143echo "PLATFORM_LDFLAGS=$PLATFORM_LDFLAGS" >> build_config.mk
144echo "PLATFORM_CCFLAGS=$PLATFORM_CCFLAGS" >> build_config.mk
145echo "PLATFORM_CXXFLAGS=$PLATFORM_CXXFLAGS" >> build_config.mk
146