[Rd] Bugs compiling R-1.7.1 with Intel compilers icc and ifc
saikat at stat.wisc.edu
Fri Sep 26 10:46:15 MEST 2003
On Thursday, Sep 25, 2003, at 05:26 US/Eastern, CanisMaior at web.de wrote:
> Bugs compiling R-1.7.1 with Intel compilers icc and ifc,
> on x86-computer (Pentium IV) and linux operating system
Many of those bugs can be fixed by using appropriate configure options.
Some of the warnings are serious, but they quite a few of them or fixed
> as there aren't many reports about that issue, I'll give a little
> report here. (Hope I don't bother anyone)
> The best thing about using icc and ifc are the warnings, because
> it is said that the Intel compilers are stricter and give more
> precise warnings than gcc.
> Warnings are good for making better code.
> used software :
> * Intel c/c++ Compiler for 32-bit applications, Version 7.1 Build
> * Intel Fortran Compiler for 32-bit applications, Version 7.1 Build
> (both with licence FOR NON-COMMERCIAL USE ONLY)
> * autoconf (GNU Autoconf) 2.57
I used all of the above on an Intel Pentium IV running Debian Linux
testing distribution. In addition I had GNU make version 3.80
> * GNU Make version 3.79.1
> It is possible to compile R-1.7.1 with intel compilers ;-)
> There are several bugs. As the Intel compilers are quite reliable,
> the bugs may be in the R-code :-(
> *) some commands crashes R, see later.
This can be fixed with appropriate options to the compiler. See below.
> *) the configure script seems to have a bug, even if you make your own
> configure script with autoconf.
> Perhaps it's only a typo, perhaps it's an error of autoconf.
> So you have to do some things manually:
This indeed is a bug in the configure script. I have a fix that works
for the intel and the GNU compilers. I have no idea if it breaks
anything for other compilers or platforms.
> run configure : (you have to adjust the paths)
> env CPICFLAGS=-shared CXXPICFLAGS=-shared FPICFLAGS=-shared
> SHLIB_LDFLAGS=-shared ./configure CC=icc CFLAGS=-O2
> CPPFLAGS=-I/opt/intel/compiler70/ia32/include F77=ifc CXX=icc
> CXXFLAGS=O2 FFLAGS=-C90
A better set of configure options is
./configure CC=icc CFLAGS='-O2 -mp'
CPPFLAGS=-I/opt/intel/compiler70/ia32/include F77=ifc CXX=icc
CXXFLAGS='-O2 -mp' FFLAGS='-C90 -w90 -w95 -mp'
CPICFLAGS=-shared CXXPICFLAGS=-shared FPICFLAGS=-shared
The -mp option forces stricter IEEE-754 floating point arithmetic
Any operation involving an NA or NaN crashes R without this option.
The icc and ifc also have a less strict -mp1 option which does not work
The -w90 and -w95 suppresses warnings about Fortran syntax made
obsolete by Fortran 90 or 95.
> 2) delete a wrong path in some Makefiles:
> The quotation mark is the wrong thing. Delete it!
The problem is in the AC_F77_LIBRARY_LDFLAGS macro. It guesses the
linker flags by passing a verbose option (-v for ifc) to the compiler.
For ifc this produces a multiline output, one line continued to the
next by a \ character. It also contains some " characters. These
together produces the wrong results. We can fix this by removing all \
and " from the variable ac_f77_v_output in that macro. I am not sure if
this breaks anything in other compilers.
> or better: Do a
> make &> this_is_a_logfile.log &
> which writes the compiler warnings to a file.
> Now it should succeed.
After you do everything I described, the make should succeed. It will
still show some warnings. I think most of the warnings for R itself is
> make check
> fails. That's a first hint that there are some problems.
Now make check should work.
> Don't install that R!
I would still be cautious about installing an R compiled with icc/ifc
as your default but I think it is useful for the warnings it produces.
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