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这段时间，我在用软件实现一个3D图形库，因为一些原因，想要使用c++11中的东西。被迫自己编译gcc4.7. 在这个过程中传到了很多的问题，经过不懈的努力终于是成功编译出来了，现在记录一下，算作个备份。
我是在Ubuntu11.10上编译的.会到了如下错误
1.configure错误，说没有gmp,什么的。
2. undefined reference to `lexer_line’
3. fatal error: bits/predefs.h :File or directory not found
4. ld can’t find crti.o
相应的解决如下:
1. apt-get install libgmp10-dev libmpfr-dev libmpc-dev
2. apt-get install flex bison
3. 4. 在网上下了一个编译脚本，直接运行就行了
下面是且这个脚本编译的过程:
1. 按照上面1和2安装好gmp,等等;
2. 到官网上下载代码放在 $HOME/src/gcc-4.7/files/中
3. 下载附件中的脚本，修改PKG_SNAPSHOT_VER和TARGET_SYSTEM_TYPE，然后直接运行即可。
4. 按脚本运行的提示完成最后的工作（比如建立符号链接啊什么的）
脚本如下:
- #!/bin/sh
- # Filename: build_gcc-snapshot.sh
- # Created: 15-Mar-2011
- # RunAs: user or root
- # Last Changed: 09-Oct-2011
- export LANG=C
- export LC_ALL=C
- PKG_NAME=“gcc”
- PKG_VER=“4.7”
- PKG_SNAPSHOT_VER=“4.7-20120128”
- BASE_DIR=“$HOME/src/${PKG_NAME}-${PKG_VER}”
- SRC_DIR=“${BASE_DIR}/${PKG_NAME}-${PKG_SNAPSHOT_VER}”
- BUILD_DIR=“${BASE_DIR}/gcc-build”
- DL_DIR=“${BASE_DIR}/files”
- DL_FILE=“${PKG_NAME}-${PKG_SNAPSHOT_VER}.tar.bz2”
- PATCHES_DIR=“${BASE_DIR}/patches”
- BUILD_SYSTEM_TYPE=$(dpkg-architecture -qDEB_BUILD_GNU_TYPE)
- HOST_SYSTEM_TYPE=$(dpkg-architecture -qDEB_HOST_GNU_TYPE)
- TARGET_SYSTEM_TYPE=“x86_64-linux-gnu”
- HOST_SYSTEM_MULTIARCH_TYPE=$(dpkg-architecture -qDEB_HOST_MULTIARCH)
- PREFIX=“/opt/${PKG_NAME}-${PKG_VER}”
- LIB_DIR=“${PREFIX}/lib”
- LIB_EXEC_DIR=“${PREFIX}/lib”
- BUILD_LOG_FILE=“${BASE_DIR}/make.log”
- GCC_VER_FOR_BUILD=“4.6”
- CC_FOR_BUILD=“gcc-${GCC_VER_FOR_BUILD}”
- CXX_FOR_BUILD=“g++-${GCC_VER_FOR_BUILD}”
- CPP_FOR_BUILD=“cpp-${GCC_VER_FOR_BUILD}”
- export CC=“${CC_FOR_BUILD}” CXX=“${CXX_FOR_BUILD}” CPP=“${CPP_FOR_BUILD}”
- echo “##### CC … $CC”
- echo “##### CXX … $CXX”
- echo “##### CPP … $CPP”
- MULTIARCH_FLAGS=“-B/usr/lib/${HOST_SYSTEM_MULTIARCH_TYPE} -I/usr/include/${HOST_SYSTEM_MULTIARCH_TYPE}”
- export CFLAGS=“-g -O2”
- export CXXFLAGS=“${CFLAGS}”
- export CFLAGS_FOR_TARGET=“${CFLAGS} ${MULTIARCH_FLAGS}”
- export CXXFLAGS_FOR_TARGET=“${CXXFLAGS} ${MULTIARCH_FLAGS}”
- ##LD_PRELOAD_FOR_BUILD=“${PREFIX}/lib/libgcc_s.so.1”
- ##export LD_PRELOAD=${LD_PRELOAD_FOR_BUILD}
- MAKE_JOBS=“3”
- echo “##### MAKE_JOBS … ${MAKE_JOBS}”
- test -e ${BASE_DIR} || mkdir -p ${BASE_DIR}
- echo “##### Base directory … ${BASE_DIR}”
- echo “##### Unpacking ${DL_FILE} …”
- tar -xf ${DL_DIR}/${DL_FILE} -C ${BASE_DIR}
- echo “##### Finished unpacking.”
- test -e ${BUILD_DIR} || mkdir -p ${BUILD_DIR}
- cd ${BUILD_DIR}
- echo “##### Build directory … $PWD”
- # HELP: http://www.linuxfromscratch.org/lfs/view/development/chapter06/gcc.html
- # NOTE: apt-get install libgmp10-dev libmpfr-dev libmpc-dev
- echo “##### Configuring gcc-build …”
- ../${PKG_NAME}-${PKG_SNAPSHOT_VER}/configure \
- –prefix=${PREFIX} \
- –libdir=${LIB_DIR} \
- –libexecdir=${LIB_EXEC_DIR} \
- –program-suffix=-${PKG_VER} \
- –enable-clocale=gnu \
- –enable-languages=c,c++ \
- –enable-shared \
- –enable-threads=posix \
- –disable-bootstrap \
- –disable-libssp \
- –disable-multilib \
- –disable-nls \
- –with-system-zlib \
- –without-cloog \
- –without-ppl \
- –with-arch-32=i586 –with-tune=generic \
- –build=${BUILD_SYSTEM_TYPE} –host=${HOST_SYSTEM_TYPE} –target=${TARGET_SYSTEM_TYPE}
- echo “##### Finished configuring.”
- echo “##### Compiling gcc-build …”
- make FLAGS_FOR_TARGET=“${FLAGS_FOR_TARGET} ${MULTIARCH_FLAGS}” -j${MAKE_JOBS} 2>&1 | tee ${BUILD_LOG_FILE}
- echo “##### Finished compiling.”
- echo “NOTE #1: Before installing your shiny new gcc run the gcc-testsuite to check your build is OK!”
- echo “NOTE #2: Don’t forget to generate symlinks in system’s bin directory!”
- echo “EXAMPLE: sudo ln -sf ${PREFIX}/bin/${PKG_NAME}-${PKG_VER} /usr/bin/${PKG_NAME}-${PKG_VER}”
- echo “NOTE #3: Don’t forget to add ${PREFIX}/lib’ to /etc/ld.so.conf.d/${TARGET_SYSTEM_TYPE}.conf!”
- echo “EXAMPLE: sudo ldconfig -v”
