Re: [Boost-users] Use of ccache with Boost

Subject: Re: [Boost-users] Use of ccache with Boost
From: Dalton, Tom (tom.dalton_at_[hidden])
Date: 2009-10-06 05:30:21

I am working on a toolchain that lives outside of the system path. All
the tools (gcc, ccache, cmake, valgrind etc) live in /some/random/path,
with their own gcc/gcc-3.4.6 or ccache/ccache-2.4 directories under
that. Within those directories, the packages binary install is under a
directory like ccache-2.4-bin

So the full path to g++ in this case is
/some/random/path/gcc/gcc-4.4.1/gcc-4.4.1-bin/bin/g++

The build system (ant) then builds the tools with a controlled
environment (e.g. by setting up PATH, LD_LIBRARY_PATH etc.). This
approach works fine fro the tools built with autoconf/automake and the
tools that are binary distributions (e.g. java jdk), and works fine with
boost as long as I'm not trying to be clever.

In /some/random/path/ccache/ccache-2.4/ccache-2.4-bin/bin I created
symlinks to ccache names gcc and g++.
I then set the PATH to run the boost build to be
/some/random/path/ccache/ccache-2.4/ccache-2.4-bin/bin:/some/random/path
/gcc/gcc-4.4.1/gcc-4.4.1-bin/bin:{rest of the system path}

As stated, this approach works for all the other tools, but causes the
boost build to diverge as described below and I don't understand why. I
also tried adding symlinks named cpp and c++ but the behaviour described
below didn't change...

Thanks for your help,

Tom

-----Original Message-----
From: boost-users-bounces_at_[hidden]
[mailto:boost-users-bounces_at_[hidden]] On Behalf Of Roland Bock
Sent: 05 October 2009 18:13
To: boost-users_at_[hidden]
Subject: Re: [Boost-users] Use of ccache with Boost

Dalton, Tom wrote:
> Further to my questions from last week:
> 
> I've tried both methods - first I tried changing the toolset to make 
> the gcc toolset use "ccache g++" as the compiler executable. I had 
> some problems with that, so I tried the symlink approach suggested by
Roland.
> This is also failing, with some seemingly very subtle bug that I can't

> suss out.
> 
> The build progresses a little way, until it gets to 
> libs/program_options/src/cmdline.cpp
> 
> When g++ isn't a symlink to ccache, I get the following output as 
> shown by the attachment build.log.1.fragment.
> When I have gcc & g++ symlinks in the ccache bin dir pointing to 
> ccache (the PATH is ccache/bin:real_gcc/bin), the output is like the 
> second attachment and the file fails.

Hmm? What symlinks do you have in the ccache folder? I only required
symlinks in /usr/local/bin, as described here
http://ccache.samba.org/ccache-man.html

I am using 4.2.4 and boost compiles with no problems at all. In daily
life, I am using CMake, like Mathieu, but direct calls to g++ or
compilation with configure&make never failed on me.

Regards,

Roland

> 
> The build logs diverge from that point onwards as more and more stuff 
> either fails, or is skipped due to previous failures.
> 
> There are 2 issues that I can see from those logs. Firstly the line 
> numbering on the .hpp includes is one-out on the ccache-enabled build.
> Does this mean the preprocessor is behaving strangely? Secondly, on 
> line
> 15 of the failing fragment file, it looks like part of the output is 
> cut off (at the end of the line, it gets
> "boost::_bi::list2<boost::_bi::v0.000008 sec system; 0.000164 sec
user".
> 
> Can anyone help me? I don't know what would cause either of these 
> issues.
> 
> Tom
> 
> PS Using gcc 4.4.1, ccache 2.4 and tried boost 1.39.0 and 1.40.0, with

> the same results.
> 
> 
> -----Original Message-----
> From: boost-users-bounces_at_[hidden]
> [mailto:boost-users-bounces_at_[hidden]] On Behalf Of Dalton, Tom
> Sent: 29 September 2009 16:20
> To: boost-users_at_[hidden]
> Subject: Re: [Boost-users] Use of ccache with Boost
> 
> Daniel and Roland,
> 
> Thanks guys, that gives me some good avenues to explore.
> 
> Tom
> 
> -----Original Message-----
> From: boost-users-bounces_at_[hidden]
> [mailto:boost-users-bounces_at_[hidden]] On Behalf Of Daniel James
> Sent: 29 September 2009 16:07
> To: boost-users_at_[hidden]
> Subject: Re: [Boost-users] Use of ccache with Boost
> 
> 2009/9/29 Dalton, Tom <tom.dalton_at_[hidden]>:
>> I'm using Boost on Linux however for various reasons I need to 
>> rebuild
> 
>> parts of it occasionally. For other C/C++-based tools that are built 
>> with autoconf/automake, I've started to use ccache
>> (http://ccache.samba.org/) to speed up recompilation. This is done 
>> simply by setting the CC / CXX environment variables to "ccache gcc" 
>> /
> 
>> "ccache g++" respectively. I have had a look through the Jam 
>> documentation but I can't see an easy way to achieve the same thing 
>> when building the Boost distribution. The closest I came was a bit on

>> the trac that simply said I can add a new toolset, but had no real
> instructions as to how.
> 
> Create a file called 'user-config.jam' in your home directory, 
> containing something like:
> 
> using gcc : : ccache g++ ;
> 
> Or possibly with the version number:
> 
> using gcc : 4.4 : ccache g++-4.4 ;
> 
> For more information see:
> 
> http://www.boost.org/doc/libs/1_40_0/doc/html/bbv2/advanced.html#bbv2.
> ad
> vanced.configuration
> 
> Daniel
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