[Boost-users] boost.m4 checks correct header but detects wrong header version

Subject: [Boost-users] boost.m4 checks correct header but detects wrong header version
From: Peter Schueller (ps_at_[hidden])
Date: 2009-08-24 05:57:38

(posting to the boost-users list and to the boost.m4 maintainer)

I'm using autotools with the newest boost.m4 from
http://repo.or.cz/w/boost.m4.git and have the following problem:

I have several boost installations, among others a 1.34.1 in
/usr/include and several in my homedir in
/home/staff/ps/include/boost-1_36/
/home/staff/ps/include/boost-1_37/
/home/staff/ps/include/boost-1_39/

Calling configure with --with-boost=/home/staff/ps/include/boost-1_37/
I get the following information:

checking for Boost headers version >= 103300...
/home/staff/ps/include/boost-1_37/include
checking for Boost's header version... 1_34_1

The first check finds the correct headers, the second one uses the wrong ones.

configure.log says:
====
configure:20676: checking for a sed that does not truncate output
configure:20755: result: /usr/bin/sed
configure:20787: checking for Boost headers version >= 103300
configure:20841: g++ -c -g -O2
-I/home/staff/ps/include/boost-1_37/include conftest.cpp >&5
configure:20847: $? = 0
configure:20876: result: /home/staff/ps/include/boost-1_37/include
configure:20886: checking for Boost's header version
configure:20907: result: 1_34_1
configure:20938: checking boost/scoped_ptr.hpp usability
configure:20955: g++ -c -g -O2
-I/home/staff/ps/include/boost-1_37/include conftest.cpp >&5
configure:20961: $? = 0
configure:20975: result: yes
configure:20979: checking boost/scoped_ptr.hpp presence
configure:20994: g++ -E  -I/home/staff/ps/include/boost-1_37/include
conftest.cpp
configure:21000: $? = 0
configure:21014: result: yes
====

So only the one check does not use the newly found CPPFLAGS.
I also saw that the header check is done WITHOUT using _AC_DO_STDERR
so the actual g++ call for the header check is not shown.

Unfortunately I did not succeed in changing the check to use
_AC_DO_STDERR so I'm writing this mail instead of sending a patch
suggestion.

Regards,
Peter Schüller

--
Peter Schüller
Institute of Information Systems, Vienna University of Technology
Favoritenstrasse 9-11/1843, A-1040 Vienna, Austria
T: [phone] E: ps AT kr DOT tuwien DOT ac DOT at
Homepage: http://www.kr.tuwien.ac.at/staff/ps/
TU Wien DVR: 0005886