XL Fortran Enterprise Edition for AIX : User's Guide - IBM

xlf90, xlf90_r, and xlf90_r7 commands and the set of xlf95, xlf95_r, and xlf95_r7
commands. We recommend that you switch to the Fortran 95 formats for data files
whenever possible.
By default, the xlf90, xlf90_r, and xlf90_r7 commands do not conform completely
to the Fortran 90 standard. Also, by default, the xlf95, xlf95_r, and xlf95_r7
commands do not conform completely to the Fortran 95 standard. If you need full
compliance, compile with any of the following additional compiler options (and
suboptions):
-qnodirective -qnoescape -qextname -qfloat=nomaf:rndsngl:nofold -qnoswapomp
-qlanglvl=90std -qlanglvl=95std
Also, specify the following run-time options before running the program, with a
command similar to the following:
export XLFRTEOPTS="err_recovery=no:langlvl=90std"
The default settings are intended to provide the best combination of performance
and usability. Therefore, it is usually a good idea to change them only when
required. Some of the options above are only required for compliance in very
specific situations. For example, you only need to specify -qextname when an
external symbol, such as a common block or subprogram, is named main.
Compiling XL Fortran SMP Programs
You can use the xlf_r, xlf_r7, xlf90_r, xlf90_r7, xlf95_r, or xlf95_r7 command to
compile XL Fortran SMP programs. The xlf_r and xlf_r7 commands are similar to
the xlf command, the xlf90_r and xlf90_r7 commands are similar to the xlf90
command, and the xlf95_r and xlf95_r7 commands are similar to the xlf95
command. The main difference is that the thread-safe components (libraries,
crt0_r.o, and so on) are used to link and bind the object files if you specify the
xlf_r, xlf_r7, xlf90_r, xlf90_r7, xlf95_r, or xlf95_r7 command.
Note that using any of these commands alone does not imply parallelization. For
the compiler to recognize the SMP directives and activate parallelization, you must
also specify -qsmp. In turn, you can only specify the -qsmp option in conjunction
with one of these six invocation commands. When you specify -qsmp, the driver
links in the libraries specified on the smplibraries line in the active stanza of the
configuration file.
Levels of POSIX pthreads API Support
On AIX Version 5.1 and higher, XL Fortran supports 64-bit thread programming
with the 1003.1-1996 (POSIX) standard pthreads API. It also supports 32-bit
programming with both the Draft 7 and the 1003.1-1996 standard APIs.
You can use invocation commands (which use corresponding stanzas in the xlf.cfg
configuration file) to compile and then link your programs with either the
1003.1-1996 standard or the Draft 7 interface libraries.
v
v
To compile and then link your program with the 1003.1-1996 standard interface
libraries, use the xlf_r, xlf90_r, or xlf95_r command. For example, you could
specify:
xlf95_r test.f
To compile and then link your program with the Draft 7 interface libraries, use
the xlf_r7, xlf90_r7, or xlf95_r7 command. For example, you could specify:
xlf95_r7 test.f
32 XL Fortran Enterprise Edition for AIX : User’s Guide