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The G95 project  G95 is a stable, production Fortran 95 compiler available for multiplecpu architectures and operating systems. Innovations andoptimizations continue to be worked on. Parts of the F2003 standardhave been implemented in g95.  Download binaries, source and manual.LinksContributingDocumentationMail Andy: andyv@firstinter.net (bugs, comments, complaints)Compiling g95 from source G95 newsgroup onGoogleScreenshotsFortran Open Directory links to compilers, tutorials, books, andcode.Cool g95 thingsFortran.com products, services,and general information related to fortran.G95 StatusISO_VARYING_STRING Module known to work with g95. Debian packages forG95 Recent Milestones May 18, 2008 SYNC ALLMay 17, 2007 Czech translation of manualApril 18, 2007 German translation of manualMarch 14, 2007 Japanese translation of manualMarch 13, 2007 French translation of manualFebruary 1, 2007 Russian translation of manualNovember 29, 2006 Spanish translation of manual Plan The back end and libraries are now up for general testing on a varietyof boxes and operating systems. The tarball is usually updated as theweb page is. To download and install g95 on unix systems, run thefollowing command (originally from Joost Vandevondele):wget -O - http://ftp.g95.org/g95-x86-linux.tgz | tar xvfz -This will create a directory named 'g95-install' in the currentdirectory. Run (or better yet make an appropriate symbolic link) to./g95-install/bin/i686-pc-linux-gnu-g95 in order to run g95. August 27 Doug Cox has built some new windows builds. Reinhold Bader and Jonathan Hogg pointed out some path problems thathave been fixed. Reinhold also sent in crash that has been fixed. Jonathan also sent a crash that has been fixed, along with a spuriouswarning suppressed. Joshua Fasching, I replied to your mail, but it bounced... you mayhave a SELECT statement without a DEFAULT case. August 26 Doug Cox has built some new windows builds. Michael Richmond sent in a crash on kind=16 division that has beenfixed. Al Greynolds pointed out that -freal=nan caused a crash on kind=16reals, which has been fixed. I managed to get in some more work on making the library threadsafe. August 25 Michael Richmond sent in a crash for kind=16 reals that hasmysteriously vanished. Doug Cox has built some new windows builds. Dominique d'Humières sent in a crash on long character strings,the TRANSFER intrinsic, and a procedure pointer issue that have allbeen fixed. Walt Brainerd sent in a problem with DATA statements that has beenfixed, as well as a problem with the VERIFY intrinsic that has beenfixed. Walt also sent in a mystery crash that went away. Walter Spector asked if there is a global lock around any of thelibrary calls. The answer no, but I've started working on one. Thereare a lot of processors to support, but I've got most of the morepopular ones working. Michael Richmond and I sent several mails backand forth working on the locks for the alpha. Johnathon Hogg, Reinhold Bader and John Reid (all hail the convenor),sent in a subtle problem with array descriptors that has beenfixed. August 23 John Dormand found a rounding problem during multiplication of kind=16reals that has been fixed. Doug Cox has built some new windows builds. I've added initial support for kind=16 real division. August 22 John Dormand found a borrowing problem with kind=16 subtraction thathas been fixed. Michael Richmond pointed out that comparisons between kind=16 typesweren't implemented. Got these now, though they're not welltested. August 21 Doug Cox has built some new windows builds. Michael Richmond sent in a bug in kind=16 real arrays that has beenfixed. Bill Long pointed out an error message that wasn't strictly correct.I've made the wording more precise. August 20 Doug Cox has built some new windows builds. I've added support for converting from kind=16 reals to all of theother reals and integers. August 19 Jan-Willem Blokland and Angelo Graziosi pointed out that kind=16 realsweren't actually configured by default. Got that fixed now.Jan-Willem also pointed out that the -r16 option didn't exist yet.Added. Jan-Willem sent in a problem with subtraction for kind=16 numbers thathas been fixed. I've also added support for converting to kind=16reals from all the other integer and real types. Michael Richmond pointed out one final bug with the alpha build thathas been fixed. August 18 Michael Richmond sent in some pieces that will enable regular buildsfor alpha/linux once again. I've added some initial support for kind=16 (quad precision) realarithmetic. Currently supported operations are addition, subtraction,multiplication, and printing. I have a nice paper on multi-worddivision that I am digesting. August 14 Doug Cox has built some new windows builds. August 13 Doug Cox has built some new windows builds. Dominique d'Humières sent in a crash that was a regression fromyesterday that has been fixed. Matthew Halfant actually sent in a replacement link instead of justreporting a dead one. Added the new link. August 12 Doug Cox has built some windows builds. Michael Richmond and Alan Greynolds pointed out the regression incomplex statement functions broken by the fix to Reinhold's interopproblem yesterday. Also fixes for derived type statement functions. Dave Korzekwa sent in a crash on SHAPE() that has been fixed. Matthew Halfant pointed out a dead link in the manual that has beenremoved. August 11 Doug Cox has built some new windows builds. Charles Gerlach found a regression in the ALLOCATE statement on x86-64that has been fixed. Reinhold Bader sent in a C interop problem with structures that hasbeen fixed. Michael Richmond pointed out that the -mieee option is necessary forproper (ie ieee) floating point exception handling on the alpha, soI've added this option into the alpha specs. August 9 Lionel Guez and Francisco Fadrique pointed out different problems withG editing that have been fixed. This is basically the third time I'vewritten this code, though I reused a bunch of code from the firstimplementation. Doug Cox has built some new windows builds. August 8 Philippe Marguinaud sent in a crash on ENTRY statements with BINDclauses that has been fixed. Glenn Wikle sent in a subtle crash involving array pointers that hasbeen fixed. Michael Richmond sent in a patch for handling floating pointexceptions on alpha processors that has been applied. August 7 Doug Cox has built some new windows builds. I'm continuing work on the fix to the G formatting. August 6 Scot Breitenfeld sent in a problem with TRANSFER() and C_PTR that hasbeen fixed. Dave Korzekwa reported a regression SHAPE() that has been fixed. August 5 Doug Cox has built some new windows builds. Frank Muldoon sent in a problem with kind=10 reals in namelists thathas been fixed. Spent the weekend working on an allocation problem that isn't solvedyet. I've been working on another bug involving incorrect formatting in Gmode that is a little more than a one-day bug. I spent a long timestaring at the standard expecting order where it turned out there wasnone, and am ending up with a fast but somewhat brute forcesolution. The solution involves generating a table of high-precision floatingpoint numbers. I'm choosing to do this in python. It turns out thatyou can implement arbitrary precision floating point addition,subtraction, multiplication, division, and even printing in a mere twohundred lines. Easy when you don't have to be particularly fast. August 4 John Armstrong pointed out a typo in the manual that has been fixed. July 31 Doug Cox has build some new windows builds. Francois Jacq sent in a spurious -Wall warning about targets of C_PTRvariables that has been toned down. July 30 Doug Cox has built some new windows builds. Charles Gerlach reported that my latest fix to the include mechanismfailed to work. Turned out that he was mixing fortran includes and Cpreprocessing. Hopefully fixed now. Johnathan Hogg sent in another crash, this time on allocatable arraycomponents that has been fixed. July 29 Doug Cox has built some new windows builds. Angelo Graziozi, Charles Gerlach and Florent Lyard pointed out thatinclude's still aren't fixed. After enumerating the twelve maincases, I think I may have it fixed now. Jonathan Hogg sent in a problem printing array sections that has beenfixed. July 28 Alan Greynolds reported that my previous fix wasn't working, I'vefixed it for real now. Charles Gerlach also reported that my previous fixed didn't work.Turned out that the problem there was that he was talking aboutfortran includes, and I fixed the C-preprocessor includes. Got thatfixed now. What I've actually done is to change things so that includedirectories specified with a -I (not absolute paths) are themselvessearched relative to the path the of the program being compiled. Thisfacilitates compiling a program from another directory, and it howother implementations work, a behaviour inherited from C compilers. July 27 Doug Cox has build some new windows builds. July 24 Doug Cox has built some new windows builds. Alan Greynolds found another regression in ALLOCATE that has beenfixed. Mark Hadfield found a different regression (failure to deal correctlywith whitespace) in ALLOCATE that has also been fixed. July 23 Alan Greynold sent in a regression in FORALL that has been fixed. July 22 Doug Cox has built some new windows builds. Michael Richmond sent in a pair of regressions on ALLOCATE statementsthat has been fixed. I changed an old and awkward internal conventionon how these were represented. July 21 Alan Greynolds reported a regression in the build of osx/386, the"-arch i686" which is not supported by older versions of osx that hasbeen fixed (by changing 686 to 386). Charles Gerlach sent in a subtle problem with include paths and the Cpreprocessor that has been fixed. Kristján Jónasson sent in a crash on some unlikely butinvalid code that has been fixed. Andrew Porter sent in a mystery crash that mysteriously hasvanished. Michael Grabietz send in a crash on arguments to intrinsic with extraparenthesis that has been fixed. July 16 David Acreman sent in a crash on optimization on x86/darwin. Turnedout to be some incompatibility with gcc-4.1, so I've downgraded backto 4.0, implementing the fix for the indirect branch bug. Doug Cox has built some new windows builds. July 15 Reinhold Bader sent in a problem with BIND(C) common blocks that hasbeen fixed. Doug Cox has built some new windows builds. July 14 Reinhold Bader sent in a regression regarding TYPE(C_PTR) andTYPE(C_FUNPTR) that has been fixed. Michael Richmond sent in a new build for alpha/linux. We arecollaborating at getting a regular build going again. Vivek Rao suggested a warning for ALLOCATE and DEALLOCATE statementsthat has been implemented. July 10 I've fixed the "indirect jmp without `*'" bug on ppc/osx, incidentallyupgrading g95 to use gcc-4.1 for that platform. July 8 Matthew Halfant sent in a conformance problem that mysteriously vanished. Dave Grote sent in a problem with absolute includedirectories being specified during C preprocessing that has beenfixed. Charles Gerlach may have reported the same issue. July 8 Doug Cox has build some new windows builds. Vivek Rao pointed out a typo that has been fixed. July 7 Hendrik Holst pointed out that BIND(C) variable were being leftsymbols to be actually declared in other object files. I've changedthis to be a 'common' symbol that will define a variable if necessary,yet use another if it exists. July 2 Doug Cox has built some new windows builds. Martien Hulsen sent in problem with curses that is hopefully fixed. July 1 Harald Anlauf sent in a crash on TRANSFER() that has been fixed. Jonathan Hogg found a problem with -fbounds-check on x86-64 that hasbeen fixed. Doug Cox has built some new windows builds. June 30 Scot Breitenfeld pointed out some problems with C_PTR that have beenfixed. Over the last week and a half, I've been working steadily on enhancingthe build system. No real changes should be visible from the outside,but this will make things much more reliable long-time. June 20 Martien Hulsen pointed out a problem with THIS_IMAGE()-- it doesn'tlive in ISO_FORTRAN_ENV, it's a regular intrinsic. Fixed this and thesame problem with NUM_IMAGES(). June 19 Doug Cox has built some new windows builds. June 18 Al Greynolds requested a nonstandard CONVERT= specifier in OPENstatements to specify endian conversion. Legal values are'big_endian', 'little_endian', 'native' and 'swap'. Scot Breitenfeld sent in a problem with C_LOC that has been fixed, Ithink. Doug Cox has built some new windows builds. June 17 John Harper sent in a crash on the MERGE intrinsic that has beenfixed. Patti Michell sent in an alternate procedure for configuring mpich sothat it correctly finds g95. Added to the HOWTO. June 12 Doug Cox has built some new windows builds. John Harper pointed out that IEEE_SUPPORT_* intrinsic functionsweren't supported. Added support. Mat Cross pointed out a problem with log10(), when calculated withing95. It was a bit off, one bit to be precise. I've got this fixednow. June 11 Manuel Guidon sent in a crash on x86_64 that has been fixed. Doug Cox has build some windows builds. June 10 Matt Hauer sent in a crash on DEALLOCATE statements that has beenfixed. June 3 We're back after a disk crash. The backup that my ISP restored wasapparently a little more than a month old, so I am restoring thingsfrom my own copies as well as doing some new builds. May 28 Doug Cox has built some new windows builds. May 27 Reinhold Bader pointed out a problem with type declarations that hasbeen fixed, as well as a problem with intrinsic module procedures andparameters in modules Reinhold Bader and Kristján Jónasson sent in a problemwith intrinsic module procedures that has been fixed. Roberto Dallocchio sent in a problem with logical SELECT statementsthat has been fixed. Doug Cox has built some new windows builds. James Van Buskirk contributed a number of tests of instrinsicfunctions that I am incorporating into the existing suite. May 21 Things are kind of stuck with g95 at the moment, most of my buildnetwork is unavailable due to just the right router frying itself.Repairs are under way and will hopefully be finished Saturday. May 14 Jonathan Hogg sent in another regression on x86-64 that has beenfixed. Despite all the regressions, this upgrade has been relativelypainless. David Shanen reported that I didn't actually fix his problem. Aftersome more digging, I've found and fixed the problem. Doug Cox has built some new windows builds. Doug has also added a Debian/Ubuntu install package. It's up on thedownloads page. May 12 Jonathan Hogg and David Shanen sent in a regression involving x86-64array integers that has been fixed. Doug Cox has built some new windows builds. May 9 Jonathan Hogg and Michael Richmond reported a regression with thearray-size expansion on x86-64 that has been fixed. May 8 Finished the array kind index expansion. May 7 Reinhold Bader pointed out a scalar/vector problem that has beenfixed. May 6 Work continues on the array index kind expansion. John's test programnow works, but some other regressions have been created that I've beenworking on those. No new build yet. Jean-Baptiste Faure sent in a spurious warning that has been fixed. Bob Bauer's chocolate made some terrific fudge. I know that I waxpoetic sometimes about chocolates, but I really do love it. For thosecurious about how big of a lardass I am, I've lost forty pounds in thelast six months and have just recently left the realm of 'overweight'by BMI standards. May 4 John Reid and others have pointed out that array indeces on 64-bitplatforms were default integers. This is the result of a longmisunderstanding on my part. I've changed array indeces to a integerof pointer size in the front end and most of the runtime libraries.Haven't had a chance to test it yet. I also baked the first batch of fudge with Bob Bauer's chocolate. Thechocolate came in 9.75-ounce bars, which is a lot less than the 16ounces I usually use, but the result looks normal even without scalingthe recipe down. Will taste-test it tomorrow. May 2 Doug Cox has built some new windows builds. May 1 Doug Cox has built some new windows builds. John Harper relayed a problem from Simon Geard with reading complexnumbers in DECIMAL=COMMA mode that has been fixed. April 30 Bob Bauer sent in an assortment of Scharffen Berger chocolates. About half baking chocolate and halfeating chocolate. I tried one of the eating bars, and it wasextremely good. Can't wait to do some baking with these. Jens Bischoff found a crash on an invalid PARAMETER statement thathas been fixed. Lex Wennmacher discovered in a crash raising not-a-numbers to a powerthat has been fixed. April 29 Reinhold Bader sent in a subtle problem with modules that has beenfixed. Keith Refson sent a crash on -fbounds-check that has been fixed. April 20 Doug Cox has built some new windows builds. April 17 Giorgio Pastore reported a problem with kind=10 exponentiation thathas been fixed. Aleksander Schwarzenberg-Czerny contributed some configuration filesfor running g95 with PGPLOT that are now available in the howto. Doug Cox has built some new windows builds. April 15 John Young pointed out a spelling mistak that has been fixed. Andres Mujica pointed out that the INSTALL file in the binary buildswas just a bunch of autoconf boilerplate. I've replaced it with theoriginal INSTALL file from previous builds. Philippe Marguinaud found a problem with contained procedures beingconfused with entry points that has been fixed. Philippe also noticeda variation of the F2003 PROCEDURE statement that has been implemented. April 14 Doug Cox has built some new windows builds. April 10 Al Grenolds pointed out a regression with yesterday's namelists inmodules that has been fixed. Doug Cox built some new windows builds. April 9 John Robinson sent in a bug with namelist and modules that has beenfixed. Kris Kuhlman pointed out a pair of regressions that affected DavidBailey's mpfun package that have been fixed. Doug Cox has built some new windows builds. April 8 John Young suggested a warning for recursive defined assignment thathas been implemented. John also pointed out a problem with theNULLIFY statement that has been fixed. Lionel Guez sent in a regression involving a missing error whilepassing a scalar to an assumed-shape array that has been fixed. April 7 Alison Boeckmann sent in a regression involving I/O formats of arraysthat has been fixed. April 2 John Harper sent in a bug with the FLUSH statement that has beenfixed. Doug Cox has built some new windows builds. April 1 John Young sent in a path problem with the C preprocessor that hasbeen fixed. Kristján Jónasson sent in a bug with allocatable arrayI/O formats that has been fixed. John Peterson sent in a crash with respect to IEEE arithmetic that hasbeen fixed. March 31 Jun Saito reported that it was actuall Hiroshi Isakari who found theexponentiation bug from a couple days ago. March 28 Doug Cox has built some new windows builds. March 27 Martien Hulsen sent a crash on a multi-component array assignment thathas been fixed. Jun Saito and Kristján Jónasson pointed out a regressionin exponentiation that has been fixed. I've added support for the F2003 move_alloc() intrinsic. March 26 Ugo Tartaglino reported a too-zealous constraint that has beenrelaxed. Michael Duda sent in a bug with -r8 and ACOS that has been fixed. Philippe Marguinau sent in a memory allocation bug that has beenfixed. The existing binaries are the last 0.91 version, I've bumped things to0.92. The web pages have been updated. It's been way too long sincethe last stable release. I will do them more frequently in thefuture. March 25 Finished the unix-specific and windows-specific parts of thelibrary. The reformat is done. March 21 Finished the math subsection of the runtime library. March 20 Finished reformatting the I/O subsection of the runtime library. March 19 Finished the intrinsics directory of the runtime library. March 18 Finished the reformat on g95. My ideas on readability have changedsomewhat since I started writing g95, and g95 is the last of my activeprojects to be altered to fit my new tastes. The main thing is that I've been writing a lot more python. Pythonuses indentation instead of braces to indicate grouping, and Ioriginally started writing python code with a basic indentation oftwo, but it was just too cramped. Eventually, the appreciation forfour columns of python has translated itself into four columns of C.Although I try to keep the indentation level down anyhow, this is agood compromise that is readable, it lets you get plenty of stuff withan eighty column limit, yet still isn't the wacked-out eight columntabs. My new fan arrived today, and has been installed. The airflow is hugecompared with the old one, which apparently has been getting worse fora long time now. On to the runtime library, which accounts for a quarter of g95. March 17 Kept on working the reformat. My new cooling fan should arrivetomorrow. March 16 Worked on the source reformat up through the t's. This is actuallyabout 2/3rds of the way through the roughly 100 k-lines of source. Itlooks like the source files are slightly smaller that they were, dueto more tabs being used in files. March 14 John Harper pointed ou the typo involving my "cooking fan", whichshould of course been "cooling fan". Fixed. I've continued on with the source reformat, I am up to source filesstarting with 'm'. March 12 Henk Krus reported some new progress on running OpenGL with g95.Details can found at:http://www.dolfyn.net/dolfyn/f03gl_en.htmlI am up to the i's in the source renovation. A mispelling was fixedalong the way. March 11 The source renovation continues, up through the sources starting with'd'. I've already found and fixed one bug, which was never flagged bythe C compiler due to how C is parsed. March 10 My laptop, on which g95 is developed, has a problem with its coolingfan. I have a new one on order, but bugs are going to have to wait.I'm taking the opportunity to call version 0.91 complete. The nextwill be 0.92. I am now working on reformatting the code a little toreflect some of my changing tastes-- I'm changing the basic indent tofour characters from two, which was too squished. This may take awhile, since there are lots of line here, and I don't trust automaticcode-reindenters. February 27 Doug Cox has built some new windows builds. February 26 Daniel Koester sent in a crash on procedure pointers returning arraysthat caused a crash. Fixed. February 20 Joachim Geiger and Michael Richmond pointed out a crash on x86_64.I've also got a new build machine for x86_64. Feburary 13 Michael Richmond and Joachim Geiger pointed out a build problem onx86_64 that has been fixed. Pierre St-Laurent sent a gift of CAN $50.00. There was a littleinitial confusion at bank, but there are lots of Canadian visitors whocome down to Arizona for the winter. Thanks Pierre! February 7 Michael Richmond found a problem with the fix to module proceduresthat has been fixed. Eduardo Mendes wrote a HOWTO article for using MATRAN with g95. Takeshi Enomoto sent some updates to the Japanese manual that havebeen applied. Doug Cox has built some new windows builds. February 6 Kristján Jónasson found a crash on missing moduleprocedures that has been fixed, and a crash on a bad NULLIFY statementalso fixed. Toby White was having some difficulties locating a memory leak, soI've added a printout of the address of leaked blocks. January 29 Eric Johnson provided an alternative platform for linux/ppc builds.The old platform had a power supply problem. Doug Cox has built some new windows builds. January 28 Angelo Graziosi send Michael Richmond pointed out the the problem withkind=10 reals under cygwin still wasn't fixed. The problem turned outto be a case of automake not propagating CFLAGS correctly. G&uunl;nter Spahlinger sent in a pair of small patches for compilingon interix that I've applied. Doug Cox has built some new windows builds. January 25 John Nabelek pointed out that list input with G95_IGNORE_ENDFILE wasinconsistent with formatted reads. Fixed list input to stop throwingendfiles if G95_IGNORE_ENDFILE is set. Angelo Graziosi, Doug Cox and Michael Richmond pointed out a buildproblem with kind=10 reals that has been (hopefully) fixed. January 17 G&uunl;nter Spahlinger sent in a small patch for kind=10 reals thatproperly declares public subroutines. John Reid requested a way to round small numbers to zero instead ofgoing into denormalized numbers for the MMX floating point unit. I'veadded the G95_FPU_NO_DENORMALS environment variable. Denormals are agood idea for numerical calculations, but are apparently pretty slow.As usual, if you want to disable the training wheels, seat belts andair bags, g95 will let you do that. January 16 Michael Richmond pointed out that configuration of g95 no longermatched that of the library. That was a result of upgrading theancient redhat system on my laptop to a recent opensuse. The currentsource reflected the old autoconf, with the library hacked to make itwork under the new settings. Fixed now. January 15 John Harper pointed out a problem with kind=10 reals under freebsd.Freebsd starts processes with the 80387 precision control bits set to53 instead of 64. I suspect this is because the freebsd people wantedto avoid the differing results when the additional precision ispresent. From a numerical perspective, the additional precision cansave your calculation, so I've turned it back on by default. Ron James sent in a gift of US $10. I spent it on some new ski boots,which I tried out yesterday. They work great. 2007 Archives2006 Archives2005 Archives2004 Archives2003 Archives2002 Archives2001 Archives2000 Archives |
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