[Bug libstdc++/37470] parallel/base.h log2 conflicts with math.h

["paul dot isaacson at earthlink dot net" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #3 from paul dot isaacson at earthlink dot net  2008-09-12 20:41 -------
Subject: RE:  parallel/base.h log2 conflicts with math.h

Unfortunately I don't have a simple test case, but it's not too hard to
reproduce:

Download stxxl.1.2.1 and attempt to make it with pmode enabled.  The gcc
compiler will show the conflicting log2 usage while compiling various
modules.

http://sourceforge.net/project/showfiles.php?group_id=131632&package_id=1444
07&release_id=619867

My make.settings.local (see the install instructions)

STXXL_ROOT       = $(HOME)/stxxl-1.2.1
COMPILER_GCC     =g++
OPT              =-O3 -march=k8 -mtune=k8
USE_BOOST        =yes
BOOST_ROOT       =/usr/local/include/boost
PTHREAD_FLAG     =
USE_PMODE        =yes

Issue make library_g++_pmode and you will see the compilation errors.

I've already modified my local copies of the STL pmode parallel/* headers
and STXXL files that caused problems building STXXL, so I would have to
revert to the original versions and eliminate the STXXL dependencies  in my
project to see if the log2 statements in various pmode for-loops trigger the
same error.  If you need me to do this, let me know and I'll try to get you
a minimum test case.

Cheers,
Paul
-----Original Message-----
From: singler at gcc dot gnu dot org [mailto:gcc-bugzilla@gcc.gnu.org] 
Sent: Friday, September 12, 2008 1:46 AM
To: paul.isaacson@earthlink.net
Subject: [Bug libstdc++/37470] parallel/base.h log2 conflicts with math.h



------- Comment #2 from singler at gcc dot gnu dot org  2008-09-12 08:45
-------
Clearly, this is a potential conflict, and the solution is pretty obvious. 

However, I am unable to reproduce it on x86_64-unknown-linux-gnu, for a
definite test case. Do you have a simple testcase that triggers the bug (on
your platform)? Do you use the parallel mode by default
(-D_GLIBCXX_PARALLEL)
or selectively? Do you have 'using namespace ...' statements? <math.h> or
<cmath>? <algorithm.h> or <algorithm>? <numeric>? <tr1/...>? I might have
some
mental block ;-)


-- 

singler at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|unassigned at gcc dot gnu   |singler at gcc dot gnu dot
                   |dot org                     |org
             Status|NEW                         |ASSIGNED
   Last reconfirmed|2008-09-10 22:46:43         |2008-09-12 08:45:35
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37470

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37470