LF95 Linux User's Guide - Lahey Computer Systems

Chapter 2 Developing with LF64--[n]pcaProtect Constant ArgumentsCompile only. Default: --npcaSpecify --pca to prevent invoked subprograms from storing into constants. The --pca optionwill silently protect constant arguments and does not produce any warnings.If --pca is specified in conjunction with --chk (a), the action of --chk (a) is overridden by theaction of --pca. In this case, no error is generated when a dummy argument that is associatedwith a constant actual argument is assigned a new value in the subprogram.Examplecall sub(5)print *, 5endsubroutine sub(i)i = i + 1endThis example would print 5 using --pca and 6 using --npca.--[n]prefetchGenerate prefetch optimizationsCompile only. Default: --nprefetchThe --prefetch option directs the compiler to generate data prefetching instructions.--[n]privateDefault Module AccessibilityCompile only. Default: --nprivateSpecify --private to change the default accessibility of module entities from PUBLIC to PRI-VATE (see “PUBLIC” and “PRIVATE” statements in the Language Reference).--[n]quadQuad PrecisionCompile only. Default: --nquadSpecify --quad to extend all single-precision REAL and single-precision COMPLEX variables,arrays, constants, and functions to double-precision, and double-precision REAL anddouble-precision COMPLEX variables, arrays, constants, and functions to REAL(KIND=16) and COMPLEX (KIND=16) respectively. If you use --quad, all source files(including modules) in a program should be compiled with --quad. Specifying --quad willusually result in significantly slower executables.Specifying --quad forces --dbl. Specifying --dbl --quad will not raise single-precision entitiesto quad precision.36 Lahey/Fujitsu Linux64 Fortran User’s Guide