Re: [Boost-users] Building Boost 1.34.0 libraries with bjam

From: Richard Hadsell (hadsell_at_[hidden])
Date: 2007-04-30 14:56:09

Richard Hadsell wrote:

>I built the 1.33.x libraries this way:
>
>setenv PYTHON_VERSION 2.3
>bjam -sTOOLS=gcc -sGCC_ROOT_DIRECTORY=/opt/gcc344 -sGXX="g++344 -m64" -sGCC="gcc344 -m64" --with-python-root=/usr --stagedir=stageFC3 -sBUILD="debug release <threading>multi <shared-linkable>true <instruction-set>opteron" stage
>
I have made several attempts to persuade bjam to use 
/opt/gcc344/bin/g++344, and I finally discovered a solution for this 
part of the problem.  I followed the Boost.Config doc the describes 
setting environment variables and running the configure script:

setenv CXX /opt/gcc344/bin/g++344
setenv CXXFLAGS "-m64 -fPIC"
setenv LDFLAGS "-m64 -fPIC"
configure

Then I looked at the resulting Makefile and user-config.jam.

First, the environment variables seemed to have no effect on the 
user-config.jam.  When I ran bjam afterward, it still used the default 
installed g++ on my system.  So in user-config.jam I changed 'using gcc 
;' to 'using gcc : 3.4.4 : /opt/gcc344/bin/g++344 ;'.  (This was similar 
to a 'using' statement that I saw in a comment in 
tools/build/v2/user-config.jam.)

Then I saw the '--user-config=user-config.jam' magic option in 
Makefile.  I don't see this option documented in 'bjam --help' or 
anywhere else, but it worked.  The bjam build messages are using 3.4.4 
for the version part of the names, and the files are compiling.

However, I doubt very much that the other options, especially '-fPIC', 
were picked up anywhere.

I wouldn't want anyone to hold up the 1.34.0 release for these issues 
that are probably just documentation problems, but someone should note 
that it is difficult to figure out how to build with a g++ compiler 
other than the installed default one.  And if I want to compile with 
other options (e.g., -m32 for 32-bit code), I don't think I can do it.

I could still use help or, at least, reassurance.

-- 
Dick Hadsell			914-259-6320  Fax: [phone]
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