Compile GCC-4.6.2 in Ubuntu-14.0

Warning - 写在前面

• 不建议重新编译gcc.!!!

• 最后我在ubuntu14.04上安装codeviz还是失败了，原因gcc与新版本texinfo冲突，目前有Doxygen+GraphViz完全可以代替CodeViz+GraphViz，并且前者有Win版本。

• 下面是我这两天解决的问题,由于还不断有新问题出现,时间关系我暂时不走CodeViz了。

• 若有同学成功走通Codeviz这条路可以在这跟我讨论下:)

Here are some issues during my compiling gcc 4.6.2 <strong>for codeviz</strong>.

When you install codeviz, you have to install gcc first because gcc is patched for generate the call graph.
So below gcc-src-dir is <codeviz-src-dir>/compilers/gcc-graph/gcc-4.6.2/

.
└── codeviz-1.0.12
    ├── bin
    ├── compilers
     |     |---- install_gcc-4.6.2.sh  <--you will run this script,and it will: 1.download gcc-4.6.2.tar.gz 
    │   ├── gcc-graph                                                           2.mkdir    gcc-graph 
    │   │   ├── gcc-4.6.2    <--where gcc actually is                           3. untar it into gcc-graph
    │   │   └── objdir                                                          4. patch it
    │   └── gcc-patches                                                         5. compile it.

Error:

gcc configure: error: Building GCC requires GMP 4.2+, MPFR 2.3.1+ and MPC 0.8.0+

Solve:

Go to Download the binarys.
At the top of the gcc-src-dircd gcc-4.6.2
run th script./contrib/download_prerequisites
and then ./configureyou won't get this error again.

Error:

/usr/include/features.h:374:25: fatal error: sys/cdefs.h: No such file or directory.

Solve:

Go to Download the LIBS.
if you use ubuntu (14.04 like me) and your current version of gcc is 4.8，try this:
sudo apt-get install libx32gcc-4.8-dev g++-multilib build-essential
this work for me.

Error:

In file included from ../../../gcc-4.6.2/libgcc/../gcc/unwind-dw2.c:333:0:
../../../gcc-4.6.2/libgcc/../gcc/config/i386/linux-unwind.h: In function ‘x86_fallback_frame_state’:
../../../gcc-4.6.2/libgcc/../gcc/config/i386/linux-unwind.h:138:17: error: field ‘info’ has incomplete type

Solve:

+++/gcc/config/i386/linux-unwind.h:138: 
--struct siginfo info;
++siginfo_t info;

Error:

cannot find crt1.o: No such file or directory

Solve:

At first,find it.sudo find /usr/ -name crti* will ouput:

（32位）/usr/lib/i386-linux-gnu/crti.o
（64位）/usr/lib/x86_64-linux-gnu/crti.o

and setup an env-var $LIBRARY_PATH

LIBRARY_PATH=/usr/lib/i386-linux-gnu
export LIBRARY_PATH

<strong>DO NOT</strong> <i>LIBRARY_PATH=/usr/lib/i386-linux-gnu:$LIBRARY_PATH</i>,this will get an error like below:

Error:

checking LIBRARY_PATH variable... contains current directory
configure: error: 
*** LIBRARY_PATH shouldn't contain the current directory when
*** building gcc. Please change the environment variable
*** and run configure again.
make[2]: *** [configure-stage2-gcc] Error 1

Solve:

Apparently, your LIBRARY_PATH ends in a colon:

/usr/lib/x86_64-linux-gnu/:
                          ^

Get rid of that:

export LIBRARY_PATH=/usr/lib/x86_64-linux-gnu/

Error：

gperf :command not found

Solve:

just install it.
apt-get install gperf

<strong>When You Continue make, You May Get Another Error, see below.</strong>

Error:

undefined reference to libc_name_p.

Solve:

make clean and re-make again.

<strong>Sadly I've got another error. :(</strong>

Error:

../.././gcc/cp/cfns.gperf:101:1: error: ‘gnu_inline’ attribute present on ‘libc_name_p’ 
../.././gcc/cp/cfns.gperf:26:14: error: but not here

Solve:

What I do is:

line 99:
 --register int hval = len;
 ++register int hval = (int)len;//mod 1

line 127:
 --#if defined __GNUC_STDC_INLINE__ || __GNUC_GNU.....
 ++#ifdef __GNUC_STDC_INLINE__//mod 2

a little different from where I found the solution.
refer to this site:<a href=https://github.com/jmccrohan/openwrt/commit/46f366f967757517ff75753db0647b166a838a6b>toolchain: fix gcc 4.6 build with gcc5 </a>

WARNING: There are still a lot of issues(VERSION THINGS) when compiling gcc4.6.2 in ubuntu 14.04.