LF95 Linux User's Guide - Lahey Computer Systems

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Appendix A Programming Hintsfloating-point data can be accommodated with runtime options C and M (see “RuntimeOptions” on page 131). By default, LF64 reads and writes numeric data in “little-endian”format.File Creation: Default NamesIf a file is opened without specifying a filename, the file is assigned the name fort.unit,where unit is the unit number specified in the OPEN statement.If a file is opened as STATUS=’SCRATCH’, and FILE= is not specified, then the file isassigned a random name and is created in the system temporary directory. If FILE= is specified,then the file is created in the current working directory. In both cases, the file is deletedupon program termination, even if it is closed with STATUS=’KEEP’ (see “IntermediateFiles” on page 13).Normal program termination causes all files to be closed.Link TimeYou can reduce the link time by reducing the number of named COMMON blocks you use.Instead of coding:code:common /a1/ icommon /a2/ jcommon /a3/ k...common /a1000/ k1000common /a/ i,j,k, ..., k1000Year 2000 complianceThe "Year 2000" problem arises when a computer program uses only two digits to representthe current year and assumes that the current century is 1900. A compiler can look for indicationsthat this might be occurring in a program and issue a warning, but it cannot foreseeevery occurrence of this problem. It is ultimately the responsibility of the programmer to correctthe situation by modifying the program. The most likely source of problems for Fortranprograms is the use of the obsolete DATE() subroutine. Even though LF64 will compile andlink programs that use DATE(), its use is strongly discouraged; the use ofDATE_AND_TIME(), which returns a four digit date, is recommended in its place.126 Lahey/Fujitsu Linux64 Fortran User’s Guide
Year 2000 complianceLF64 can be made to issue a warning at runtime whenever a call to DATE() is made. Thiscan be accomplished by running a program with the runtime options -Wl,Ry,li forexample,./myprog -Wl,-Ry,-liFor more information on runtime options, see “Runtime Options” on page 133.Lahey/Fujitsu Linux64 Fortran User’s Guide 127
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Lahey/Fujitsu Linux64Fortran User
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ContentsScripts....................
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Manual OrganizationManual Organizat
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Uninstalling LF64Uninstalling LF64T
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Other Sources of InformationLahey W
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2 Developing withLF64This chapter d
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OptionsOnce again, please note that
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Chapter 2 Developing with LF64Contr
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Chapter 2 Developing with LF64--[n]
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Chapter 2 Developing with LF64If ei
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Chapter 2 Developing with LF64• T
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Chapter 2 Developing with LF64Use t
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Compiler and Linker OptionsThe -Kev
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Compiler and Linker OptionsWhen -Kt
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Compiler and Linker OptionsSee also
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Compiler and Linker Options-N[no]au
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Compiler and Linker OptionsWhen not
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Compiler and Linker OptionsIf the -
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Compiler and Linker OptionsBe sure
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Compiler and Linker OptionsThe -v95
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Compiler and Linker Options-xargInl
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How the Linker Selects ObjectsHow t
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BLAS and LAPACK Libraries (PRO Vers
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3 Mixed LanguageProgrammingLF64 cod
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Runtime initializationcharacter, th
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Passing Datastruct {float real;floa
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Returning Function Values to CTable
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Returning Function Values to Fortra
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Passing ArraysPassing ArraysBecause
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Passing Character DataIn addition,
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Calling Standard C LibrariesExample
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4 Command-LineDebugging with fdbfdb
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RegistersRegisters$BP Base Pointer$
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Help CommandsHelp CommandshelpDispl
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Breakpointscondition #n exprAssocia
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Controlling Program Executionnext [
Page 79 and 80: Setting and Displaying Program Vari
Page 81 and 82: Automatic Displaylist +|-offsetDisp
Page 83 and 84: Miscellaneous Controlsstop Executio
Page 85 and 86: Processes and Threadsparam leakRepo
Page 87 and 88: 5 Multi-Processing(PRO version only
Page 89 and 90: Controlling parallel program execut
Page 91 and 92: Performance ImprovementOMP_SCHEDULE
Page 93 and 94: Hardware for Multi-ProcessingHardwa
Page 95 and 96: Details of Multi-ProcessingCPU 2:do
Page 97 and 98: Details of Multi-Processingdo i = 1
Page 99 and 100: Optimization Control Line!OCL i [,i
Page 101 and 102: Optimization Control Linep do j = 1
Page 103 and 104: • At the loop positionOptimizatio
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Page 107 and 108: Notes on ParallelizationIn this exa
Page 109 and 110: Notes on ParallelizationCPU 2:sum2
Page 111 and 112: Implementation SpecificationsIt is
Page 113 and 114: Implementation Specifications!$omp
Page 115 and 116: 6 Automake(PRO version only)Introdu
Page 117 and 118: The AUTOMAKE Configuration FileFILE
Page 119 and 120: The AUTOMAKE Configuration FileIf t
Page 121 and 122: NOQUITONERRORSpecifies that AUTOMAK
Page 123 and 124: Automake Notes• AUTOMAKE is invok
Page 125 and 126: 7 Utility ProgramsThis chapter docu
Page 127 and 128: AProgramming HintsThis appendix con
Page 129: Direct File Format (Formatted)Direc
Page 133 and 134: Limits of OperationTable 11: LF64 L
Page 135 and 136: BRuntime OptionsThe behavior of the
Page 137 and 138: Execution Return ValuesExecution Re
Page 139 and 140: Descriptions of Runtime Optionsand
Page 141 and 142: Descriptions of Runtime OptionsExam
Page 143 and 144: Descriptions of Runtime Options-run
Page 145 and 146: Environment Variables for Input/Out
Page 147 and 148: CLahey TechnicalSupportLahey Comput
Page 149 and 150: Lahey Warranties• Step-by-step pr
Page 151 and 152: Return ProcedureReturn Shipping Ins
Page 153 and 154: IndexSymbols- 43A-a runtime option
Page 155 and 156: IndexLD_LIBRARY_PATH environmentvar
Page 157 and 158: IndexSTDIN, runtime option -r 139ST
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LF95 Linux User's Guide - Lahey Computer Systems

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