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

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-qdirective Option Syntax -qdirective[=directive_list] | -qnodirective[=directive_list] DIRECTIVE[(directive_list)] | NODIRECTIVE[(directive_list)] Specifies sequences of characters, known as trigger constants, that identify comment lines as compiler comment directives. Background Information A compiler comment directive is a line that is not a Fortran statement but is recognized and acted on by the compiler. To allow you maximum flexibility, any new directives that might be provided with the XL Fortran compiler in the future will be placed inside comment lines. This avoids portability problems if other compilers do not recognize the directives. Defaults The compiler recognizes the default trigger constant IBM*. Specification of -qsmp implies -qdirective=smp\$:\$omp:ibmp, and, by default, the trigger constants SMP$, $OMP, and IBMP are also turned on. If you specify -qsmp=omp, the compiler ignores all trigger constants that you have specified up to that point and recognizes only the $OMP trigger constant. Specification of -qthreaded implies -qdirective=ibmt, and, by default, the trigger constant IBMT is also turned on. Arguments The -qnodirective option with no directive_list turns off all previously specified directive identifiers; with a directive_list, it turns off only the selected identifiers. -qdirective with no directive_list turns on the default trigger constant IBM* if it has been turned off by a previous -qnodirective. Notes v Multiple -qdirective and -qnodirective options are additive; that is, you can turn directive identifiers on and off again multiple times. v One or more directive_lists can be applied to a particular file or compilation unit; any comment line beginning with one of the strings in the directive_list is then considered to be a compiler comment directive. v The trigger constants are not case-sensitive. v The characters (, ), ', ", :, =, comma, and blank cannot be part of a trigger constant. v To avoid wildcard expansion in trigger constants that you might use with these options, you can enclose them in single quotation marks on the command line. For example: xlf95 -qdirective=’dbg*’ -qnodirective=’IBM*’ directives.f v This option only affects Fortran directives that the XL Fortran compiler provides, not those that any preprocessors provide. 148 XL Fortran Enterprise Edition for AIX : User’s Guide
Examples ! This program is written in Fortran free source form. PROGRAM DIRECTV INTEGER A, B, C, D, E, F A = 1 ! Begin in free source form. B = 2 !OLDSTYLE SOURCEFORM(FIXED) ! Switch to fixed source form for this include file. INCLUDE ’set_c_and_d.inc’ !IBM* SOURCEFORM(FREE) ! Switch back to free source form. E = 5 F = 6 END For this example, compile with the option -qdirective=oldstyle to ensure that the compiler recognizes the SOURCEFORM directive before the INCLUDE line. After processing the include-file line, the program reverts back to free source form, after the SOURCEFORM(FREE) statement. Related Information See the section on the SOURCEFORM directive in the XL Fortran Enterprise Edition for AIX Language Reference. As the use of incorrect trigger constants can generate warning messages or error messages or both, you should check the particular directive statement in the Directives section of the XL Fortran Enterprise Edition for AIX Language Reference for the suitable associated trigger constant. XL Fortran Compiler-Option Reference 149
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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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Page 114 and 115: -brtl Option Syntax -brtl | -bnortl
Page 116 and 117: -bstatic Option Related Information
Page 118 and 119: -c Option Syntax -c Prevents the co
Page 120 and 121: -d Option Syntax -d Causes preproce
Page 122 and 123: -g Option Syntax -g DBG | NODBG Gen
Page 124 and 125: -k Option Syntax -k FREE(F90) Speci
Page 126 and 127: -l Option Syntax -lkey Searches the
Page 128 and 129: -O Option Syntax -O[level] OPTimize
Page 130 and 131: -o Option Syntax -o name Specifies
Page 132 and 133: -p Option Syntax -p[g] Sets up the
Page 134 and 135: -q32 Option Related Information See
Page 136 and 137: -qalias Option Syntax -qalias={[no]
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Page 144 and 145: v v If your primary concern is exec
Page 146 and 147: -qassert Option Syntax -qassert={de
Page 148 and 149: -qautodbl Option Syntax -qautodbl=s
Page 150 and 151: Related Information For background
Page 152 and 153: 2 Level-2 cache or the table lookas
Page 154 and 155: -qcheck Option Syntax -qcheck | -qn
Page 156 and 157: -qcompact Option Syntax -qcompact |
Page 158 and 159: -qctyplss Option Syntax -qctyplss[(
Page 160 and 161: -qdbg Option Syntax -qdbg | -qnodbg
Page 164 and 165: -qdirectstorage Option Syntax -qdir
Page 166 and 167: -qdpc Option Syntax -qdpc[=e] | -qn
Page 168 and 169: -qescape Option Syntax -qescape | -
Page 170 and 171: -qextchk Option Syntax -qextchk | -
Page 172 and 173: -qextname Option Syntax -qextname[=
Page 174 and 175: -qfdpr Option Syntax -qfdpr | -qnof
Page 176 and 177: -qflag Option Syntax -qflag=listing
Page 178 and 179: the reciprocal of the divisor. It a
Page 180 and 181: export SQRT_EXCEPTION=3.1 166 XL Fo
Page 182 and 183: -qfree Option Syntax -qfree[={f90|i
Page 184 and 185: -qhalt Option Syntax -qhalt=severit
Page 186 and 187: If you specify -qhot=novector, the
Page 188 and 189: -qhssngl Option Syntax -qhssngl | -
Page 190 and 191: -qinit Option Syntax -qinit=f90ptr
Page 192 and 193: v You can specify alphabetic digits
Page 194 and 195: -qintsize Option Syntax -qintsize=b
Page 196 and 197: -qipa Option Syntax -qipa[=suboptio
Page 198 and 199: If you specify short, the Object Fi
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Page 202 and 203: -qkeepparm Option Syntax -qkeepparm
Page 204 and 205: Restrictions The -qflag option can
Page 206 and 207: -qlibansi Option Related Informatio
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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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-qipa=list cross-file type checking
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Stream-access formatted files: A re
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I/O Redirection The important thing
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Default Record Lengths File Permiss
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XLFRTEOPTS="unit_vars=yes" # Allow
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Logical Volume I/O To use a logical
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READ(unit_number,ID=idvar) a .... W
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450 end do close(20) end Performanc
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Table 22. Table for Binding an Appl
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v The result of an application does
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Sometimes an application can guaran
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v v The XL compilers generate code
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#include template class junk { pri
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Notes: 1. In interlanguage communic
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Table 25. Escape Sequences for Char
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You can use this built-in function
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The system linkage convention passe
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Run-time Stack for 32-bit Environme
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processing, and the fifth doublewor
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v v v v v v v In a 32-bit Environme
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Will Be Passed In: R3 0 Storage Map
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Function Values Functions return th
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Example The control structure has t
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technique can reduce the amount of
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Note: When you run an XL Fortran pr
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Duplicating Extensions from Other S
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Input/Output Errors If the error de
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-> xlf95 -qddim -g testprog.f -o te
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7. The next step is to research why
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Note that you cannot use the -qextn
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v v Memory leak reporting that indi
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HD_FILL HD_STACK=n called a certain
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Source Section The source section c
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Attribute and Cross-Reference Secti
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Automating Large, Complex Compilati
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For fixed source form code, in addi
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Common Industry Extensions That XL
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Example 2 - Valid C Routine Source
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close(10) open(10, file="fun10.out"
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!**********************************
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operating system require the same o
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Examples of Storage Relationships f
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0 4 8 16 32 64 COMPLEX (16) COMPLEX
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! Data values between r8 and x16 ar
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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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