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

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Note: When you run an XL Fortran program on a system without the XL Fortran message catalogs, run-time error messages (mostly for I/O problems) are not displayed correctly; the program prints the message number but not the associated text. To prevent this problem, copy the XL Fortran message catalogs from /usr/lpp/xlf/bin/default_msg to a directory that is part of the NLSPATH environment-variable setting on the execution system. 372 XL Fortran Enterprise Edition for AIX : User’s Guide
Fixing Installation or System Environment Problems If individual users or all users on a particular machine have difficulty running the compiler, there may be a problem in the system environment. Here are some common problems and solutions: xlf90: not found xlf90_r: not found xlf90_r7: not found xlf95: not found xlf95_r: not found xlf95_r7: not found xlf: not found xlf_r: not found xlf_r7: not found f77: not found fort77: not found f90: not found f95: not found Symptom: The shell cannot locate the command to execute the compiler. Solution: Make sure that your PATH environment variable includes the directory /usr/bin. If the compiler is properly installed, the commands you need to execute it are in this directory. Could not load program program Error was: not enough space Killed Symptom: The system cannot execute the compiler or an application program at all. Solution: Set the storage limits for stack and data to “unlimited” for users who experience this problem. For example, as superuser you can set both your hard and soft limits with these ksh commands: ulimit -s unlimited ulimit -d unlimited Because non-superusers are not completely free to give themselves unlimited limits, if you are a superuser you may find it more convenient to edit the file /etc/security/limits to give all users unlimited stack and data segments (by entering -1 for these fields). If the storage problem is in an XLF-compiled program, using the -qsave or -qsmallstack option might prevent the program from exceeding the stack limit. Explanation: The compiler allocates large internal data areas that may exceed the storage limits for a user. XLF-compiled programs place more data on the stack by default than in previous versions, also possibly exceeding the storage limit. Because it is difficult to determine precise values for the necessary limits, we recommend making them unlimited. Could not load program program Could not load library library_name.a [object_name] Error was: no such file or directory Solution: Make sure the XL Fortran libraries are installed in /usr/lib, or set the LIBPATH environment variable to include the directory where libxlf90.a is installed if it is in a different directory. See “LIBPATH:Setting Library Search Paths” on page 14 for details of this environment variable. Symptom: Messages from the compiler or an XL Fortran application program are displayed in the wrong language. Solution: Set the appropriate national language environment. You can set the national language for each user with the command smit chlang. Alternatively, each user can set one or more of the environment variables LANG, NLSPATH, LC_MESSAGES, LC_TIME, and LC_ALL. If you are not familiar with the purposes of these variables, “Environment Variables for National Language Support” on page 13 provides details. Symptom: A compilation fails with an I/O error. Solution: Increase the size of the /tmp filesystem, or set the environment variable TMPDIR to the path of a filesystem that has more free space. Explanation: The object file may have grown too large for the filesystem that holds it. The cause could be a very large compilation unit or initialization of all or part of a large array in a declaration. Symptom: There are too many individual makefiles and compilation scripts to easily maintain or track. Solution: Add stanzas to the configuration file, and create links to the compiler by using the names of these stanzas. By running the compiler with different command names, you can provide consistent groups of compiler options and other configuration settings to many users. Fixing Compile-Time Problems The following sections discuss common problems you might encounter while compiling and how to avoid them. Problem Determination and Debugging 373
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XL Fortran Enterprise Edition for A
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Note! Before using this information
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Options That Control Listings and M
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How XLF I/O Interacts with Pipes, S
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viii XL Fortran Enterprise Edition
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x XL Fortran Enterprise Edition for
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The following performance-related d
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How to Read the Syntax Diagrams and
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v Optionally, enter the value of at
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6 XL Fortran Enterprise Edition for
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Migration Support The XL Fortran co
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These items are located, or accesse
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v /usr/share/man/info/en_US/xlf/pos
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Notes: 1. Specifying the LC_ALL env
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3. Installing a compiler program te
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fsuffix cppsuffix osuffix ssuffix l
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mcrt = /lib/mcrt0_r.o gcrt = /lib/g
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options include -L/usr/lpp/xlf/lib,
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Related Information: You can use th
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Table 1. Potential Problems Migrati
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Table 1. Potential Problems Migrati
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►► xlf90 xlf90_r xlf90_r7 xlf95
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xlf90, xlf90_r, and xlf90_r7 comman
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Related Information: The ssuffix at
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Related Information: See “-qpdf O
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The @PROCESS compiler directive mus
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Passing Fortran Files through the C
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the trigraph sequence. XL Fortran u
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The configuration file /etc/xlf.cfg
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esulting program work as you expect
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v v Do not use names that are the s
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v v Build the application by using
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If you have applications in which F
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total_usertime Returns the total us
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To obtain support for items that ar
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Note: You may need the old setting
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These partitions are then assigned
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During the busy-wait search for wor
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(for example, loops for which you s
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Other Environment Variables That Af
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Options That Control Input to the C
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Table 3. Options That Control Input
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Table 5. Options for Performance Op
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Table 5. Options for Performance Op
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Table 6. Options for Debugging and
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Table 7. Options That Control Listi
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Table 8. Options for Compatibility
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v v Determine names and options for
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Detailed Descriptions of the XL For
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-1 Option Syntax -1 ONETRIP | NOONE
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-b64 Option Syntax -b64 The AIX ope
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Examples xlf95 f.f -brtl -bshared -
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-bloadmap Option Syntax -bloadmap:n
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-brtl Option Syntax -brtl | -bnortl
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-bstatic Option Related Information
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-c Option Syntax -c Prevents the co
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-d Option Syntax -d Causes preproce
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-g Option Syntax -g DBG | NODBG Gen
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-k Option Syntax -k FREE(F90) Speci
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-l Option Syntax -lkey Searches the
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-O Option Syntax -O[level] OPTimize
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-o Option Syntax -o name Specifies
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-p Option Syntax -p[g] Sets up the
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-q32 Option Related Information See
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-qalias Option Syntax -qalias={[no]
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equivalence (a, b(3)) t = b; a = t
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a derived type are stored with suff
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pwr2s p2sc You can run the executab
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v v If your primary concern is exec
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-qassert Option Syntax -qassert={de
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-qautodbl Option Syntax -qautodbl=s
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Related Information For background
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2 Level-2 cache or the table lookas
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-qcheck Option Syntax -qcheck | -qn
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-qcompact Option Syntax -qcompact |
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-qctyplss Option Syntax -qctyplss[(
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-qdbg Option Syntax -qdbg | -qnodbg
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-qdirective Option Syntax -qdirecti
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-qdirectstorage Option Syntax -qdir
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-qdpc Option Syntax -qdpc[=e] | -qn
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-qescape Option Syntax -qescape | -
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-qextchk Option Syntax -qextchk | -
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-qextname Option Syntax -qextname[=
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-qfdpr Option Syntax -qfdpr | -qnof
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-qflag Option Syntax -qflag=listing
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the reciprocal of the divisor. It a
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export SQRT_EXCEPTION=3.1 166 XL Fo
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-qfree Option Syntax -qfree[={f90|i
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-qhalt Option Syntax -qhalt=severit
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If you specify -qhot=novector, the
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-qhssngl Option Syntax -qhssngl | -
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-qinit Option Syntax -qinit=f90ptr
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v You can specify alphabetic digits
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-qintsize Option Syntax -qintsize=b
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-qipa Option Syntax -qipa[=suboptio
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If you specify short, the Object Fi
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Table 15. Regular expression syntax
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-qkeepparm Option Syntax -qkeepparm
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Restrictions The -qflag option can
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-qlibansi Option Related Informatio
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-qlibposix Option Related Informati
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-qlistopt Option Syntax -qlistopt |
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-qlog4 Option Syntax -qlog4 | -qnol
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Restrictions Depending on the sourc
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-qmixed Option Syntax -qmixed | -qn
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-qmodule Option Syntax -qmodule=man
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-qnullterm Option Syntax -qnullterm
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-qonetrip Option Syntax -qonetrip |
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-qpdf Option Syntax -qpdf{1|2} Tune
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mergepdf Generates a single pdf rec
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-qphsinfo Option Syntax -qphsinfo |
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-qpic Option Syntax -qpic[=suboptio
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sce | nosce } else if (a == 3) *res
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-qprefetch Option Syntax -qprefetch
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-qrealsize Option Syntax -qrealsize
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-qrecur Option Syntax -qrecur | -qn
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To produce a listing file that you
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-qsave Option Syntax -qsave[={all|d
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-qsclk Option Syntax -qsclk[=centi
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-qsigtrap Option Syntax -qsigtrap[=
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-qsmp Option Syntax -qsmp[=suboptio
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threshold=n The work in a partition
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xlf90 -qsmp=noopt -O3... is equival
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-qspillsize Option Syntax -qspillsi
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-qstrictieeemod Option Syntax -qstr
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-qsuffix Option Syntax -qsuffix=opt
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Examples @process nullterm i = 1; j
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Related Information See the OpenMP
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-qthreaded Option Syntax -qthreaded
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If you do not specify -qtune, its s
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-qundef Option Syntax -qundef | -qn
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-qunwind Option Syntax -qunwind |-q
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-qwarn64 Option See “-qwarn64 Opt
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-qxflag=xalias Option Syntax -qxfla
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intxor | nointxor Treats .XOR. as a
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Examples Consider the following pro
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In this example, conditional compil
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-qzerosize Option Syntax -qzerosize
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-t Option Syntax -tcomponents Appli
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-u Option Syntax -u UNDEF | NOUNDEF
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-V Option Syntax -V This option is
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$ ./a.out 1 2 3 4 276 XL Fortran En
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-y Option Syntax -y{n | m | p | z}
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64-Bit Thread Support On AIX Versio
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-q64 Option Syntax -q64[=largetype]
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-qwarn64 Option Syntax -qwarn64 | -
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286 XL Fortran Enterprise Edition f
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v v If the data or program code con
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v Comparisons involving NaN values
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How XL Fortran Rounds Floating-Poin
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2. For thread-safety and reentrancy
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v The fltint suboption speeds up fl
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There are other related operating s
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Another method is to use the ieee_s
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call fpgets(fpstat) fpstat(fpox) =
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The following example shows the dif
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v Code that might cause an exceptio
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Optimization levels Option -qnoopt/
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v -qcache=auto Optimization level -
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v v v Reducing the costs of memory
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Loop unrolling also increases code
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2. Run the application using a typi
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# Let the compiler decide (relative
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can also use the SNAPSHOT directive
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Page 340 and 341: Stream-access formatted files: A re
Page 342 and 343: I/O Redirection The important thing
Page 344 and 345: Default Record Lengths File Permiss
Page 346 and 347: XLFRTEOPTS="unit_vars=yes" # Allow
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Page 352 and 353: 450 end do close(20) end Performanc
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Page 356 and 357: v The result of an application does
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Page 360 and 361: v v The XL compilers generate code
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Page 364 and 365: Notes: 1. In interlanguage communic
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Page 368 and 369: You can use this built-in function
Page 370 and 371: The system linkage convention passe
Page 372 and 373: Run-time Stack for 32-bit Environme
Page 374 and 375: processing, and the fifth doublewor
Page 376 and 377: v v v v v v v In a 32-bit Environme
Page 378 and 379: Will Be Passed In: R3 0 Storage Map
Page 380 and 381: Function Values Functions return th
Page 382 and 383: Example The control structure has t
Page 384 and 385: technique can reduce the amount of
Page 388 and 389: Duplicating Extensions from Other S
Page 390 and 391: Input/Output Errors If the error de
Page 392 and 393: -> xlf95 -qddim -g testprog.f -o te
Page 394 and 395: 7. The next step is to research why
Page 396 and 397: Note that you cannot use the -qextn
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Page 404 and 405: Source Section The source section c
Page 406 and 407: Attribute and Cross-Reference Secti
Page 410 and 411: Automating Large, Complex Compilati
Page 412 and 413: For fixed source form code, in addi
Page 414 and 415: Common Industry Extensions That XL
Page 420 and 421: Example 2 - Valid C Routine Source
Page 422 and 423: close(10) open(10, file="fun10.out"
Page 424 and 425: !**********************************
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Page 428 and 429: Examples of Storage Relationships f
Page 430 and 431: 0 4 8 16 32 64 COMPLEX (16) COMPLEX
Page 432 and 433: ! Data values between r8 and x16 ar
Page 434 and 435: end function sqrt real*8 function r
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Table 34. MASS Vector Library Funct
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IBM may use or distribute any of th
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ind. To relate an identifier to ano
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expression. A sequence of operands,
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name. A lexical token consisting of
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labels can be used to transfer cont
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.profile file 12 .s files 33, 34 .X
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fdate_ service and utility subprogr
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nonested_par suboption of -qsmp 234
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vi text editor 29 W W error severit
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