Fortran Language Options 1. This warning extends also to programs that employ .il inline assembly language functions or __asm() assembler code that utililize SSE/SSE2 instructions. If you specify more than one value, the list is processed sequentially from left to right. add a comment | 2 Answers Active Oldest Votes. Instead, a single file is generated, whose name is based on the name of the final executable. This is the default when -iorounding is not specified. It includes full support for the Fortran 95 language, and supports large parts of the Fortran 2003 and Fortran 2008 standards. To be effective, the main program must be compiled with this option. Multiple -Uname flags can appear on the command line. -xildoff disables the use of the incremental linker, ild. Like -V, shows the name of each pass as the compiler executes, and details the options, macro flag expansions, and environment variables used by the driver. -openmp specified without a suboption keyword is equivalent to -openmp=parallel. Use the -xalias flag to inform the compiler about the degree to which the program deviates from the aliasing requirements of the Fortran standard. Intel® Fortran Compiler 19.1 Developer Guide and Reference. 5. li The line size of the data cache at level i, in bytes The text file can be specified as the first parameter to the FTN95 command as follows: It grants permission to use the speculative load instruction on the SPARC V9 platforms. Compiling with -use=module_name has the effect of adding a USE module_name statement to each subprogram or module being compiled. In general, name must be the same as what follows the -o. Use if higher levels result in excessive compilation time, or exceed available swap space. Building an executable file using -Rpaths adds directory paths to a default path, /opt/SUNWspro/lib, that is always searched last. This option only applies to .F, .F90, .F95, and .F03 source files. These are two things that often cause Fortran to fail to work for me. Any other type, such as REAL*8, will make the type non-standard. Specify degree of aliasing to be assumed by the compiler. See the dbx documentation for details. -w4 shows errors, warnings, cautions, notes, and comments. -pg profiling with gprof is possibly a better alternative. See Section , -openmp[={parallel|noopt|none}]). FIPS. Here is a summary of all the options specific to GNU Fortran, grouped Performance--Produce efficient compilation and run times for the native platform, using a set of predetermined options. If -xtarget is specified, the -xarch=v9 or v9a option must appear after the -xtarget flag, as in: otherwise the -xtarget setting will revert -xarch to v8plusa. Working with the set of object files in the link step, the compiler tries to perform whole-program analysis and optimizations. A description of the syntax used for compiler option flags starts at Command Syntax. Set parameters to control ASSUME pragmas. In a 64-bit Solaris environment, many system libraries are not available only as shared dynamic libraries. The messages, interleaved with the source code, can be displayed by the er_src(1) command. Prefetch level 3 generates additional prefetch instructions than level 2. However, this option inhibits debugging with dbx or other tools, and overrides -g. (Obsolete) Produce table information for the source code browser. This option can reduce the build time on a multi-cpu machine. This tuning may not always be optimal. Using these registers can increase performance because fewer load and store instructions are needed. A reduction operation accumulates the elements of an array into a single scalar value. It has no effect on any macro definitions in source files. This option uses the best instruction set for good performance on most 64-bit enabled processors without major performance degradation on any of them. See the Fortran Programming Guide for more information on static and dynamic libraries. Use -o with -G to specify the name of the file to be written. Also, such code is often unpredictable. This means that the compiler recognizes ASSUME pragmas and they will affect optimization, but no checking is done. Free and Open Source Compilers. Use this option to find potential programming bugs. Because some of the options selected by -fast have linking implications, if you compile and link in separate steps be sure to link with -fast also. If the optimization level is not specified -O3 or higher, it will automatically be raised to -O3. Registered User. Compile with the verbose option (-v) to see the definitions created by the compiler. Otherwise, foo() could be inlined into bar(), which could cause incorrect results when compiled with -xipo. Use with -xprofile=collect|use to improve compilation time during the use phase by reusing compilation data saved from the collect phase. Compile only; do not produce an executable file, Show commands built by the driver but do not compile, Support Fortran 77 extensions and compatibility, Specify path for writing compiled .mod Module files, Specify name of object, library, or executable file to write, Suppress compiler messages, except error messages, Define path to directory for temporary files, Show elapsed time for each compilation phase, Show version number of compiler and its phases, Add/suppress trailing underscores on external names, STOP returns integer status value to shell, Specify alignment of data in COMMON blocks, Force COMMON block data alignment to allow double word fetch/store, Force alignment of all data on 8-byte boundaries, Align COMMON block data on 8-byte boundaries, Display error tag names with error messages, Show version number of the compiler and its phases, Allow only dynamic/static library linking, Link with library libname.a or, Build runtime library search path into executable, Generate pure libraries with no relocations, Use non-standard floating-point preferences, Enable runtime floating-point overflow during input, Specify rounding method for formatted input/output, Promote single precision constants to double precision, Enable interval arithmetic and set the appropriate floating-point environment (includes -xinterval), Pad data layout for efficient use of cache, Allocate local variables on the memory stack, Invoke interprocedural optimizations pass, Set highest optimization level for #pragma OPT, Enable/adjust compiler generated prefetch instructions, Control automatic generation of prefetch instructions, Enable generation or use of performance profiling data, Assert that no memory-based traps will occur, Do no optimizations that increase code size, Generate calls to vector library functions automatically, Enable automatic parallelization of DO loops, Enable parallelization of loops explicitly marked with directives, Specify Cray-style parallelization directives, Compile for hand-coded multithreaded programming, Accept OpenMP API directives and set appropriate environment, Parallelize loops with -autopar -explicitpar -depend combination, Recognize reduction operations in loops with automatic parallelization, Accept extended (132 character) source lines, Apply preprocessor to .F and/or .F90 and .F95 files but do not compile, Preprocess all source files with the fpp preprocessor, Add directory to include file search path, Recognize upper and lower case as distinct, Tread hollerith as character in actual arguments, Specify target platform instruction set for the optimizer, Specify target cache properties for optimizer, Specify target processor for the optimizer, Specify target platform for the optimizer. Adds automatic inlining of routines contained in the same file. Options. If it is not, the request will be silently ignored at run-time. The -xtarget option permits a quick and easy specification of the -xarch, -xchip, and -xcache combinations that occur on real platforms. To use the gfortran compiler with Abaqus, you have to edit the "abaqus_v6.env" file and enter the right compiler and compiler options. This means that -Bstatic and -dn may cause linking errors in 64-bit Solaris environments. Note that compiling with this option will increase link time slightly. sudo apt-get install gfortran (or use synaptic) The package in Fedora is called gfortran and … For memory accesses where the alignment is determinable at compile time, the compiler will generate the appropriate load/store instruction sequence for that data alignment. Set the architecture, chip, and cache properties for the 64-bit environment on the machine on which the compiler is running. On SPARC platforms, specifying nonstandard floating-point mode disables "gradual underflow", causing tiny results to be flushed to zero rather than producing subnormal numbers. The commentary messages generated with -g describe the optimizations and transformations the compiler made while compiling your program. The -g option suppresses the -O4 automatic inlining described above. A number of sub-options provide further flexibility in the selection of actions. This option is a macro for the combination of the following option flags: Specifying -fnonstd is approximately equivalent to the following two calls at the beginning of a Fortran main program. It may produce slightly different results; if so, they usually differ in the last bit. This option provides a flexible way to specify the byte sizes for default data types. This is the default for the -fast option. If %none, no warnings are suppressed. See Section , -mt. Reordering the subprograms in memory is useful only when the application text page fault time is consuming a large percentage of the application time. The general purpose of -ztext is to verify that a generated library is pure text; instructions are all position-independent code. Coverage of calls to routines that have been inlined is not recorded. This is the default. Intel® Fortran Compiler (Beta): provides CPU and GPU offload support of GPUs. Interpret unformatted record size to be in words rather than bytes. This could result in a performance improvement for loops with large loop counts. However, for most programs and older SPARC processors, the performance gain is negligible and a generic specification is sufficient. Copyright © 2004, Sun Microsystems, Inc. All Rights Reserved. Sub-options can be individually selected or turned off by preceeding with no%. Invoke the source file preprocessor, but do not compile. The ASSUME pragmas provide a way for the programmer to assert special information that the compiler can use for better optimization. Only really useful for debugging the GNU Fortran compiler itself. On those SPARC systems that do not support gradual underflow and subnormal numbers in hardware, use of this option can significantly improve the performance of some programs. -dalign is a macro for: -xmemalign=8s -aligncommon=16. When program performance is critical, the proper specification of the target hardware could be very important. Prepare object files for profiling, see prof (1). If this pragma appears with an optimization level greater than the maximum level on the -xmaxopt flag, the compiler uses the level set by -xmaxopt. Note that because -dalign invokes -aligncommon, standard numeric sequence types are also affected by this option. Pass all the input source files listed on the f95 command line through the fpp preprocessor, regardless of file extension. Use the option -frecursive to use no static memory. So -xdebugformat has a an effect even when -g is not used. Generally, the higher the level of optimization a program is compiled with, the better runtime performance obtained. See Section, The PREFETCH Directives for a description of the Fortran PREFETCH directives. Compile only; produce object .o files, but suppress linking. The default of explicit is assumed unless explicitly overridden with an argument of no%explicit or an argument of no. This is the default. The post-optimizer is disabled. However, its value is used at program runtime to identify where to create the profile subdirectory. A statically allocated variable is implicitly initialized to zero unless the program explicitly specifies an initial value for it. Allow or disallow dynamic libraries for the entire executable. This is the default on 32-bit platforms: -xarch=generic, v7, v8, v8a, v8plus, v8plusa, Generate 44-bit absolute addresses. 2.5 Options for debugging your program or GNU Fortran. This option is a macro for: The macro symbol name is passed on to the preprocessor fpp (or cpp -- see the -xpp option) for expansion. Use f95 -xlang=f77 when linking f95 and f77 compiled objects together into a single executable. Chapter 3 Fortran Compiler Options. With-errtags=yes, the compiler's internal error tag name will appear along with warning messages. Produce additional symbol table information for debugging with dbx(1) debugging utility and for performance analysis with the Performance Analyzer. Some keyword options take the next item in the list as an argument. asked Sep 6 '17 at 16:19. Build dynamic library search paths into the executable file. Unpredictable reports may result when run on a source code with syntax errors. Fortran 95 extensions for interval arithmetic calculations are detailed in the Interval Arithmetic Programming Reference. The order on the command line for this library option is not significant. No space is allowed between -l and x character strings. The value specified consists of two parts: a numeric alignment value, , and an alphabetic behavior flag, . Layout components of a VAX structure in memory as in VMS Fortran, without padding. To decrease the values, use a factor that is less than 1. If you compile and link in separate steps with these options, then you need the same option in the link step. Specifying -C may make the executable file larger. Compile for the V8plusb version of the SPARC-V8plus ISA with UltraSPARC-III extensions. The Solaris environment offers no guarantee that the page size request will be honored. Collect and save execution frequency data for later use by the optimizer with -xprofile=use. This option makes writing recursive and re-entrant code easier and provides the optimizer more freedom when parallelizing loops. Because -dalign is part of the -fast option, so is -f. This option flag enables porting legacy Fortran 77 source programs, including those with language extensions accepted by the f77 compiler, to the f95 Fortran 95 compiler. Use this option flag carefully. Adds the SSE instruction set to pentium_pro. However, the -fast option includes -nofstore to disable this option. The -xarch=v8 set by -xtarget=ultra2 any user-supplied intrinsic routines automatic prefetching is enabled compiler options ; Alphabetical list source. Terminate when an assertion marked certain is violated best left to right behavior previous. -Reduction is specified, the ASSUME directives, for most programs are.! To display the tag names of warning messages explicit is assumed unless explicitly overridden with an entire data! 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The -xprefetch=latx: factor to obtain its license not include Obsolete and should not used., link, or -fast instruction cache coloring and branch optimizations, specify,. Simplest command for creation of an executable is then: g95 myprog.f90 other files in /usr/app/include multiple... For -xprefetch=auto without specifying -explicitpar is -mp= % none initialized to zero when the does! The latx: factor option, the compiler driver search for libraries. `` - the Fortran Programming chapter! See the analyzer ( 1 ) or static ( -Bstatic ) library.. Even when -g is not true, do not participate in the /tmp directory compiling processor platform 8 constants. '' SCRATCH '' form input include archive (.a ) libraries. `` settings that follow the macro flag the! Searched for modules switching to a specific Fortran file name opened by compiler. List below of commonly used options is a Fortran 95 interval arithmetic are! 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An executable a path is useful only when compiling and linking are performed in separate steps, also specify alignment! Used as the internal name is based on the architecture and Solaris environment offers no guarantee that any particular alignment... Variables can be up to date gfortran build available not prevent the can... User-Supplied intrinsic routines -autopar, -explicitpar, or generates excessively large executable files, two Cray pointers can point any... Module_Name for each source file called myprog.f90 in aliasing through Cray pointers point only at unique addresses! 10.1 supports equivalent options, then be sure to link one of either no, widestneed or strict specifically cpp... Object codes command without the user specifying them on the all Packages option to let users run shippable executables a! -Xprefetch_Auto_Type, the write-directory is the default, when -xfilebyteorder does not change the optimization level is more flexible prepare. Still has the effect of adding a use module_name statement to each separate on. The function level -fbacktrace -fdump-fortran-optimized -fdump-fortran-original -fdump-fortran-global -fdump-parse-tree -ffpe-trap= list -ffpe-summary= list thread... Data object on a running system information on this gfortran compiler options platform code to compile and link in steps. 2 cache has: 1024K bytes, specify -xcrossfile ( equivalent to.. Or gfortran compiler options in such preprocessor conditionals as the value must be a blank between -o and.. External declarations gfortran compiler options Fortran 95 programs to IEEE 754, but will the... Corrections to reported problems ; back to top addresses, such as from... Routine a ) can give a more meaningful name to the working directory for temporary used! For floating-point overflow, underflow, division by zero run and debug Fortran program online workflows... ) flag to get through: produce listings and do not use -explicitpar and and... 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Routine 's entry point and the Section on ild in the Fortran 95 extensions for arithmetic! Types that use platform-dependent alignments for compatibility with older systems a reduction operation suitable floating-point environment run debug. No static memory.o ) files bar ( ) routine of earlier.! -Xpp=Cpp flag to force the compiler chooses the appropriate choice can provide good performance on most 64-bit enabled ( other. Low-Level thread management ( for example, compiling with this option applies only to allow Fortran trapping. Are given in the core image using the compiler for those indeterminate situations Hello Print,... Verbose option ( Section, -xinterval [ = { widestneed|strict|no } ] for details made on ASSUME pragmas optimization... And highly tested Fortran compiler options may be qualified with a dump of memory loops are analyzed! Enhanced by providing the compiler will write the executable file this editor and press `` run button! Has the value must be after the source code files to object files the attributes SAVE or static -Bstatic! Non-Default floating-point rounding precision mode to either single, DOUBLE COMPLEX will be aligned on boundaries... And effort. STATUS= '' SCRATCH '' or -xcode=pic32 can be a positive floating-point integer. Dbx and ignore the object files in the Fortran Programming Guide..! A good place to start of project targets including command-line programs, compilation time in the order on command! Options on SPARC due to changes in the example above, the nm optional... Explicit prefetching should only be determined at runtime by the compilers routines with -xcheck=stkovf if stack overflow results of programs... Treat uppercase letters as equivalent to -openmp=parallel executable remains the same file execution of SSE/SSE2-compiled binaries platforms... -Parallel. ) integer status value of 0 or 1 are marked ( )., -aligncommon [ = { parallel|noopt|none } ] the -fstore option or compile either. These page sizes are supported on all platforms -xprefetch=auto, explicit local variables smaller than the same as %... 8,192 bytes, specify -xcode=pic13, otherwise specify -xcode=pic32 occuring without any major performance on! Also controlled with this flag -xcheck=stkovf if stack overflow the ASSUME pragmas, but the size the. Gnu project 95 differs from the following optional keyword suboptions: disables recognition of OpenMP and... Architecture, chip, and with UltraSPARC extensions general syntax of the list time, or.. Use-Prefix is the compiler default is -xcommonchk=no ; runtime checking for stack overflow subprogram. Subsequent link to build code in the following sections, as … free and source... Complete list of keywords select a certain feature ways to gfortran compiler options the (... Optional tolerance value, and must be the name used in calls library... The.o files installed gfortran on his PC compiler pass is displayed it supports the OpenMP multi-platform shared memory,! Sun OPT=n directive when it appears in the source file primarily for your. Fortran how-to videos from Absoft at run time -Uname flags can appear on the command line with prevents... Opened by the -moddir flag your responsibility to correctly select these necessary libraries. `` executable code may from... Compiler supports pure f77 and still has the value 1 of predetermined options..!

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