xref: /leveldb-1.20/build_detect_platform (revision f57e2335) 
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# - PORT_CFLAGS will either set:
8#               -DLEVELDB_PLATFORM_POSIX if cstatomic is present
9#               -DLEVELDB_PLATFORM_NOATOMIC if it is not
10# - PLATFORM_CFLAGS with compiler flags for the platform
11# - PLATFORM_LDFLAGS with linker flags for the platform
12
13# Delete existing build_config.mk
14rm -f build_config.mk
15
16# Detect OS
17case `uname -s` in
18    Darwin)
19        PLATFORM=OS_MACOSX
20        echo "PLATFORM_CFLAGS=-pthread -DOS_MACOSX" >> build_config.mk
21        echo "PLATFORM_LDFLAGS=-lpthread"  >> build_config.mk
22        ;;
23    Linux)
24        PLATFORM=OS_LINUX
25        echo "PLATFORM_CFLAGS=-pthread -DOS_LINUX" >> build_config.mk
26        echo "PLATFORM_LDFLAGS=-lpthread"  >> build_config.mk
27        ;;
28    SunOS)
29        PLATFORM=OS_SOLARIS
30        echo "PLATFORM_CFLAGS=-D_REENTRANT -DOS_SOLARIS"  >> build_config.mk
31        echo "PLATFORM_LDFLAGS=-lpthread -lrt" >> build_config.mk
32        ;;
33    *)
34        echo "Unknown platform!"
35        exit 1
36esac
37
38echo "PLATFORM=$PLATFORM" >> build_config.mk
39
40# On GCC, use libc's memcmp, not GCC's memcmp
41PORT_CFLAGS="-fno-builtin-memcmp"
42
43# Detect C++0x -- this determines whether we'll use port_noatomic.h
44# or port_posix.h by:
45# 1. Rrying to compile with -std=c++0x and including <cstdatomic>.
46# 2. If g++ returns error code, we know to use port_posix.h
47g++ $CFLAGS -std=c++0x -x c++ - -o /dev/null 2>/dev/null  <<EOF
48  #include <cstdatomic>
49  int main() {}
50EOF
51if [ "$?" = 0 ]; then
52    PORT_CFLAGS+=" -DLEVELDB_PLATFORM_POSIX -DLEVELDB_CSTDATOMIC_PRESENT -std=c++0x"
53else
54    PORT_CFLAGS+=" -DLEVELDB_PLATFORM_POSIX"
55fi
56
57# Test whether Snappy library is installed
58# http://code.google.com/p/snappy/
59g++ $CFLAGS -x c++ - -o /dev/null 2>/dev/null  <<EOF
60  #include <snappy.h>
61  int main() {}
62EOF
63if [ "$?" = 0 ]; then
64    echo "SNAPPY=1" >> build_config.mk
65else
66    echo "SNAPPY=0" >> build_config.mk
67fi
68
69echo "PORT_CFLAGS=$PORT_CFLAGS" >> build_config.mk
70