Re: Is that a way to modify tar.m4?

[xufeng zhang]

On 11/26/2010 06:39 AM, Stefano Lattarini wrote:
> On Wednesday 24 November 2010, xufeng zhang wrote:
>    
> > Hi,
> >
> > I want to modify m4/tar.m4 in automake-1.11.1, however, after I made the
> > change, build automake failed, here is the build error:
> > -------------------------------------------------------
> >    Compiling:  automake
> > -------------------------------------------------------
> > CDPATH="${ZSH_VERSION+.}:"&&  cd .&&
> > perllibdir="/home/xufeng/WindRiver/common_pc_automake/build-tools/automake-1.11.1/lib:./lib"
> > "/home/xufeng/WindRiver/common_pc_automake/build-tools/automake-1.11.1/aclocal"
> > --acdir=m4 -I m4
> > /bin/sh:
> > /home/xufeng/WindRiver/common_pc_automake/build-tools/automake-1.11.1/aclocal:
> > No such file or directory
> > Makefile:337: *** [aclocal.m4] Error 127
> >
> >      
> Could you please show the *exact* sequence of commands that caused
> this error?  Also, are you building from an automake tarball, or
> from a cloned git repository?
>    
Hi Stefano,

Thanks very much for your reply.
This problem has troubled me about two weeks, some info has been 
provided as you required.

Here is my reproduce steps:
1. I download automake source: automake-1.11.1-1.fc12.src.rpm and unpack it.
2. Here is the origin time stamp of tar.m4:
        \> ls -l tar.m4
        -rw-r--r-- 1 seaspray seaspray 3103 2009-12-04 08:38 tar.m4
   Then I patch the tar.m4:
       \> patch -p1 < tar-m4.patch
   And here is the new time stamp of tar.m4 after patched:
       \> ls -l tar.m4
        -rw-r--r-- 1 seaspray seaspray  3224 2010-11-26 09:59 tar.m4
3. Next I configure automake:
        \> ./configure
4. Last compile automake, and the error happens:
    CDPATH="${ZSH_VERSION+.}:" && cd . && 
perllibdir="/home/xufeng/WindRiver/common_pc_automake/build-tools/automake-1.11.1/lib:./lib" 
"/home/xufeng/WindRiver/common_pc_automake/build-tools/automake-1.11.1/aclocal" 
--acdir=m4 -I m4
/bin/sh: 
/home/xufeng/WindRiver/common_pc_automake/build-tools/automake-1.11.1/aclocal: 
No such file or directory
make: *** [aclocal.m4] Error 127
5. However, If the change the time stamp of tar.m4 to origin:
        \> touch -t 0912040838 tar.m4
    Then run 'make' command can be successful and aclocal file is created.

>    
> > I know it is caused by the timestamp mess up,
> >      
> It's not a mess-up: automake's own aclocal.m4 uses the contents of tar.m4,
> and so, when tar.m4 is modified, the automake build system wants to rebuild
> aclocal.m4 too.  That's absolutely correct.
>    
Just based on the above reproduce steps, I think it's caused by time 
stamp mess-up,
maybe it's not correct.
>    
> > so I want to know if there is a way to do this?
> >      
> Just a hunch: have you built the automake and aclocal scripts *before*
> modifying tar.m4?  If you haven't, well, you should build them first,
> because the Automake build system uses the very automake and aclocal
> scripts it ships, so you must be sure to build them before hacking any
> other part of automake.
>    
You can see I do nothing before modify tar.m4, I don't think it's 
necessary for me to
do that.

Thanks,
Xufeng Zhang
>    
> > Thanks,
> > Xufeng Zhang
> >
> >      
> HTH,
>    Stefano
>