Gpc November 2012

gpc@gnu.de

5 participants
3 discussions

GPC with gcc-4.[23]
by Waldek Hebisch 18 Apr '13

18 Apr '13

I did some work on updating gpc to newer gcc versions. You can find it at GitHub: https://github.com/hebisch/gpc This is experimental work. 4.2 and 4.3 ports (on "master" Git branch) are basically in "works for my purpose" state: on my machine compiler builds and passes test suite with small (but nonzero) number of failures. On 4.5.1 there is initial port to gcc-4.[45] -- this one is broken from user point of view and may be of some use only for people who want to seriously work on the compiler. Note that this is _not_ a release. There are relatively easy to fix but non working things (in particular some features of Makefiles are broken). Testing was limited to running testsute just for one configuration. I estimate that fixing easily fixable stuff and polishing things would take me about a week -- unfortunately I am busy with other things. So I decided to make the code available "as is". If there will be bug reports, I will look at them and there is reasonable chance that I will fix them. But otherwise I do not plan to work on gpc in near future. If you want to try the code note that there are changes to build process, look at toplevel README file. -- Waldek Hebisch hebisch(a)math.uni.wroc.pl

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Re: Understanding {$I-} {$I+} ioResult
by Prof. A Olowofoyeku (The African Chief) 26 Nov '12

26 Nov '12

On 26 Nov 2012 at 14:59, Baudouin Le Charlier wrote: > > Le 26 nov. 2012 à 12:39, Prof. A Olowofoyeku (The African Chief) a > écrit : > > > On 26 Nov 2012 at 9:10, Baudouin Le Charlier wrote: > > > > [...] > >>> This is a historical factor, and there was no need to duplicate > >>> features that Borland already documented well, and which were well > >>> known to Borland Pascal/Delphi programmers. > >> > >> I am not sure they are so well known since you did not explain to > >> me why (i.e. by which miracle) a program that stops abruptly (when > >> compiled with $I-), stops normally if you add a call to ioResult > >> *after* the io statement that makes the original program fail. I > >> doubt very much that this could be explained in the original > >> Borland documentation and also that this behavior should be well > >> known of Borland Pascal programmers. > > > > As I said, the Borland Pascal/Delphi help files are freely available > > on the net. If you want to use Borland Pascal/Delphi compatibility > > features in GPC, you would do well to study the Borland > > documentation on those features. > > > > This is from a 20 year old Borland Turbo Pascal help file: > > > > [--- excerpt begins ---] > > $I: Input/Output-Checking Switch > > Enables or disables the automatic code generation that checks the > > result of a call to an I/O procedure > > > > Syntax: $I+ or $I- > > Default: $I+ > > Type: Local > > Command-Line: /$I+ or /$I- > > Menu Command: Options|Compiler|I/O Checking > > > > Remarks > > If an I/O procedure returns a non-zero I/O result when the $I switch > > is on, the program terminates, displaying a run-time error message. > > > > > > When the $I switch is off, you must use the IOResult function to > > check for I/O errors. [--- excerpt ends ---] > > > > Please let us stop this meaningless debate now. > > To me, it is not meaningless. I sent you an example where gnu pascal > does not conform to the excerpt you just sent me : the program is > compiled with the switch off but nevertheless it stops with an error > message. And where in that code did you use the IOResult function to check for errors? Best regards, The Chief ------- Prof. Abimbola Olowofoyeku (The African Chief) Web: http://www.greatchief.plus.com

2 1

Bus error when writing in a typed file
by Baudouin Le Charlier 26 Nov '12

26 Nov '12

Hi ! I am using a Mac OS X 10.6.8. I have downloaded GNU Pascal for Mac Os fromhttp://www.microbizz.nl/gpc.html. I have been using GNU Pascal for writing very simple programs for an introductory programming course and it worked fine until I wrote the following program for which I got a "bus error" when writing a first record in the file (at line 128). Notice that the program executes without errors when compiled with free pascal compiler. I should be happy if anyone can help me to solve this "problem". Baudouin Le Charlier

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Gpc November 2012