f57e23351f
This revision adds two major changes: 1. build_detect_platform which generates build_config.mk with platform-dependent flags for the build process 2. /port/atomic_pointer.h with anAtomicPointerimplementation for platforms without <cstdatomic> Some of this code is loosely based on patches submitted to the LevelDB mailing list at https://groups.google.com/forum/#!forum/leveldb Tip of the hat to Dave Smith and Edouard A, who both sent patches. The presence of Snappy (http://code.google.com/p/snappy/) and cstdatomic are now both detected in the build_detect_platform script (1.) which gets executing during make. For (2.), instead of broadly importing atomicops_* from Chromium or the Google performance tools, we chose to just implement AtomicPointer and the limited atomic load and store operations it needs. This resulted in much less code and fewer files - everything is contained in atomic_pointer.h. git-svn-id: https://leveldb.googlecode.com/svn/trunk@34 62dab493-f737-651d-591e-8d6aee1b9529
70 lines
2.1 KiB
Bash
70 lines
2.1 KiB
Bash
#!/bin/sh
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# Detects OS we're compiling on and generates build_config.mk,
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# which in turn gets read while processing Makefile.
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# build_config.mk will set the following variables:
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# - PORT_CFLAGS will either set:
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# -DLEVELDB_PLATFORM_POSIX if cstatomic is present
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# -DLEVELDB_PLATFORM_NOATOMIC if it is not
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# - PLATFORM_CFLAGS with compiler flags for the platform
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# - PLATFORM_LDFLAGS with linker flags for the platform
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# Delete existing build_config.mk
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rm -f build_config.mk
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# Detect OS
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case `uname -s` in
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Darwin)
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PLATFORM=OS_MACOSX
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echo "PLATFORM_CFLAGS=-pthread -DOS_MACOSX" >> build_config.mk
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echo "PLATFORM_LDFLAGS=-lpthread" >> build_config.mk
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;;
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Linux)
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PLATFORM=OS_LINUX
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echo "PLATFORM_CFLAGS=-pthread -DOS_LINUX" >> build_config.mk
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echo "PLATFORM_LDFLAGS=-lpthread" >> build_config.mk
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;;
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SunOS)
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PLATFORM=OS_SOLARIS
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echo "PLATFORM_CFLAGS=-D_REENTRANT -DOS_SOLARIS" >> build_config.mk
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echo "PLATFORM_LDFLAGS=-lpthread -lrt" >> build_config.mk
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;;
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*)
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echo "Unknown platform!"
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exit 1
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esac
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echo "PLATFORM=$PLATFORM" >> build_config.mk
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# On GCC, use libc's memcmp, not GCC's memcmp
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PORT_CFLAGS="-fno-builtin-memcmp"
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# Detect C++0x -- this determines whether we'll use port_noatomic.h
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# or port_posix.h by:
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# 1. Rrying to compile with -std=c++0x and including <cstdatomic>.
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# 2. If g++ returns error code, we know to use port_posix.h
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g++ $CFLAGS -std=c++0x -x c++ - -o /dev/null 2>/dev/null <<EOF
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#include <cstdatomic>
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int main() {}
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EOF
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if [ "$?" = 0 ]; then
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PORT_CFLAGS+=" -DLEVELDB_PLATFORM_POSIX -DLEVELDB_CSTDATOMIC_PRESENT -std=c++0x"
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else
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PORT_CFLAGS+=" -DLEVELDB_PLATFORM_POSIX"
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fi
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# Test whether Snappy library is installed
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# http://code.google.com/p/snappy/
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g++ $CFLAGS -x c++ - -o /dev/null 2>/dev/null <<EOF
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#include <snappy.h>
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int main() {}
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EOF
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if [ "$?" = 0 ]; then
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echo "SNAPPY=1" >> build_config.mk
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else
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echo "SNAPPY=0" >> build_config.mk
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fi
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echo "PORT_CFLAGS=$PORT_CFLAGS" >> build_config.mk
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