Gdb / buildroot 交叉编译。

使用buildroot 编译低版本的mips gdb 的时候，gdb源码需要手动打补丁，主要是uClibc库的问题。

链接：

https://git.busybox.net/uClibc/commit/?id=2da958760f798224065508431787e3a83b7fe2ae

http://uclibc.10924.n7.nabble.com/PATCH-ldso-libdl-include-dl-tls-h-for-mips-static-link-td8544.html

buildroot 在make的时候，当buildroot-2013.08.1/output/build/ 下出现选择的uClibc库的时候：uclibc-0.9.33.2，中断当前make。

img

然后参考上面链接，给 libdl.c ，signum.h 写上补丁代码。

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\# if defined(USE_TLS) && USE_TLS && defined(__mips__) && !defined(SHARED)

\# include <dl-tls.h>

\# endif

与

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#define _NSIG       128

然后再次进行编译。当然，buildroot版本选择要合适。2013版，才有Mips-I 的指令集。

这里我编译最低的gdb版本是 gdb7.7.1。若编译gdb.7.6 则还会出现其他错误。Gdb.7.7 是2014年的，已经够低了，没有必要在往下。

用到的一些命令

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--prefix=/root/u-boot/gdb-7.8.1/include/

gdb 编译：
./configure --host=mips-buildroot-linux-uclibc --build=x86_64-redhat-linux --target=mips-buildroot-linux-uclibc CC=/home/pc/Desktop/buildroot-2014.11/output/host/usr/bin/mips-linux-gcc
./configure --target=mips-linux --host=mips-linux --program-prefix=mips-linux CC=/home/pc/Desktop/buildroot-2014.11/output/host/usr/bin/mips-linux-gcc

export PATH=$PATH::/usr/local/buildroot/host/usr/bin
export PATH=/home/pc/Desktop/buildroot-2014.11/output/host/usr/bin:$PATH
make CFLAGS="-static" CXXFLAGS="-static"


./configure --target=mips-linux --host=mips-linux --program-prefix=mips-linux CC=/usr/local/buildroot/host/usr/bin/mips-linux-gcc CXX=/usr/local/buildroot/host/usr/bin/mips-linux-g++
make CFLAGS="-static" CXXFLAGS="-static"

mips-linux-strip gdb | ls -alh gdb
===========================================================================================
kali下编译，说不准root：
编译错误you should not run configure as root (set FORCE_UNSAFE_CONFIGURE=1 in environment to bypass this check)
解决方法：
export FORCE_UNSAFE_CONFIGURE=1

===========================================================================================
export LDFLAGS="-static -L/home/pc/Desktop/termcap-1.3.1"
export CPPFLAGS="-I/home/pc/Desktop/termcap-1.3.1"

export PATH=$PATH::/home/pc/Desktop/buildroot-2013.11/output/host/usr/bin
===========================================================================================
交叉编译环境目录库：
buildroot-2013.11/output/host/usr/mips-buildroot-linux-uclibc/sysroot/usr/lib/

===========================================================================================
http://mirrors.ustc.edu.cn/gnu/
http://mirrors.ustc.edu.cn/kernel.org/
http://mirrors.163.com/debian/
=======================================交叉编译termcap=======================================
sudo ./configure CC=/home/pc/Desktop/buildroot-2016.02/output/host/usr/bin/mips-linux-gcc

sudo cp libtermcap.a /home/pc/Desktop/buildroot-2016.02/output/host/usr/mips-buildroot-linux-uclibc/sysroot/usr/lib
sudo cp termcap.h /home/pc/Desktop/buildroot-2016.02/output/host/usr/mips-buildroot-linux-uclibc/sysroot/usr/include/

XXXXXXX-linux-gcc --print-file-name libc.a

=================================kali===================================

./configure --target=mips-linux --host=mips-linux --program-prefix=mips-linux  CC=/root/u-boot/buildroot-2019.02.4/output/host/bin/mips-linux-gcc


cp libtermcap.a  /root/u-boot/buildroot-2019.02.4/output/host/mips-buildroot-linux-uclibc/sysroot/usr/lib/
cp termcap.h  /root/u-boot/buildroot-2019.02.4/output/host/mips-buildroot-linux-uclibc/sysroot/usr/include/

make CFLAGS="-g -O2 -static" CXXFLAGS="-g -O2 -static"

export PATH=$PATH::/root/u-boot/buildroot-2019.02.4/output/host/bin

export LDFLAGS="-static -L/root/u-boot/termcap-1.3.1/lib"
export CPPFLAGS="-I/root/u-boot/termcap-1.3.1/include"

gedit  /etc/profile
export PATH="/root/u-boot/buildroot-2019.02.4/output/host/bin:$PATH"
source /etc/profile