Gpc July 2003

gpc@gnu.de

28 participants
42 discussions

Range check tests
by Mirsad Todorovac 21 Jul '03

21 Jul '03

Progress report would say that so far this has been done: - procedure parameter range - function `Return' value range - `Include', `Exclude' - `Inc', `Dec' - `and', `or', `xor', `shl', `shr' as procedure - sets (assignment to a set when expression contains elements out of set's range) - Val (2nd parm) It can be seen here: http://www.alu.hr/~mtodorov/pascal/rngv0.02.tar.gz (updated) Comments welcome, if you have time. Remaining is: - `Pack', `Unpack' - `BlockRead', `BlockWrite' 4th parameter - `Val' (3rd parm) (-- must dig legal errorcodes out of source to get something out of range) - conformant arrays (index type in conformant array's formal parameter list is a subrange) - `New' with variant records - initialization of types, variables and typed constants If we can think of more cases where range checking occurs, even better. Yet, frankly, I'm not that deep into internals. Cheers, Mirsad -- "Experience is a harsh teacher: first comes the test, and then the lesson."

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warning: unused variable line number
by Peter N Lewis 21 Jul '03

21 Jul '03

It seems there is an off by one error with the "warning: unused variable" warning. Probably the line number is not saved when the variable identifier token is read, but instead the line following the entire variable declaration is used. Yep, declaring a typeless record supports this theory. program testpas11; procedure test; var a: Integer; b: record x,y: Integer; end; c: Integer; begin WriteLn( 'Hello' ); end; begin end. % gpc -Wall -c testpas11.pas testpas11.pas: In procedure `test': testpas11.pas:10: warning: unused variable `c' testpas11.pas:9: warning: unused variable `b' testpas11.pas:6: warning: unused variable `a' 1 program testpas11; 2 3 procedure test; 4 var 5 a: Integer; 6 b: record 7 x,y: Integer; 8 end; 9 c: Integer; 10 begin 11 WriteLn( 'Hello' ); 12 end; 13 14 begin 15 end. It would be nicer if it recorded the identifier's line number when the token was first read - I'm not sure how hard this might be though (might be easy too). Normally GPC is pretty good with line numbers... Enjoy, Peter. -- <http://www.interarchy.com/> <http://documentation.interarchy.com/>

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--assert
by Adriaan van Os 21 Jul '03

21 Jul '03

Either the implementation of the --assert flag is incorrect, or I don't understand it's use, e.g. [G4:~/gnu/testgpc/adriaan] adriaan% gpc --assert hello.pas gpc: no input files [G4:~/gnu/testgpc/adriaan] adriaan% gpc --assert --stack-checking hello.pas gpcpp: invalid option `--stack-checking' Reading specs from /Developer/Pascal/gpc33d7/lib/gcc-lib/powerpc-apple-darwin/3.3/specs Configured with: ../gpc-3.3d7/configure --enable-languages=pascal,c --enable-threads=posix --prefix=/Developer/Pascal/gpc33d7 --target=powerpc-apple-darwin Thread model: posix gpc version 20030507, based on gcc-3.3 Regards, Adriaan van Os

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Option defaults
by Adriaan van Os 16 Jul '03

16 Jul '03

The graphical user interface of an IDE option panel for the GNU Pascal compiler, could have checkboxes for options iike "short-circuit", "extended-syntax" and many other. Now, if the user e.g. checks the "short-circuit" checkbox and unchecks the "extended-syntax" checkbox, the IDE plug-in could choose (1) to pass no command line arguments to GPC for these options, because both are set to their default (2) to pass command line arguments for both options, whatever their default. The disadvantage of (1) is that it breaks if the default changes or if the documentation is wrong, of (2) that it cumulates into a very long list of arguments. Any advice on what is the lesser evil ? Things become more difficult if the default for an option depends on the Pascal dialect, as with "ignore-packed" and other options. Here, a three-state user interface element "default, yes, no" may be the alternative. Regards, Adriaan van Os

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(3. try) Make error with gpc under FreeBSD
by Karim Forsthofer 16 Jul '03

16 Jul '03

Hello I tried once again to compile gpc and gcc on my FreeBSD 5.1 system, but couldn`t made it. I explain each step to you that I did : 1. I am SU in my homedir /usr/home/karim (this is FreeBSD) and I unzip the files gpc-20030507.tar.gz and gcc-core-3.2.1.tar.gz "gzip -c -d gcc-core-3.2.1.tar.gz | tar xf -" "gzip -c -d gpc-20030507.tar.gz | tar xf -" 2. "mv /usr/home/karim/gpc-20030507/p /usr/home/karim/gcc-3.2.1/gcc/" 3. "mkdir /usr/home/karim/gpc-build" 4. "cd /usr/home/karim/gpc-build" 5. "/usr/home/karim/gcc-3.2.1/configure --enable-languages=pascal" 6. Hit enter when script ask me to patch gpc. 7. Configure worked fine and creating ./config.status creating Makefile creating intl/Makefile creating fixinc/Makefile creating gccbug creating mklibgcc creating auto-host.h 8. "make" make begins to compile but puts out a lot of warnings of the type: warning: ISO C89 does not support 'long long' Then make stops with an error at the line "bison -y -d --name-prefix__gettext --output plural.c /usr/home/karim/gcc-3.2.1/gcc-3.2.1/gcc/ intl/plural.y " "conflicts: 7 shift/reduce /usr/home/karim/gcc.3.2.1/gcc/intl/plural.y: expected 10 shift/reduce conflicts *** Error code 1 Stop in /usr/home/karim/gpc-build/gcc/intl. *** Error code 1 Stop in /usr/home/karim/gpc-build/gcc. *** Error code 1 Stop in /usr/home/karim/gpc-build. ehh ??? I also checked all requierd programs: bash I use sh sed o.k awk o.k m4 o.k bison o.k flex o.k autoconf o.k help2man o.k makeinfo o.k I got also the same error, when I tried to compile only gcc without gpc. I will also post this error msg on an gcc mailinglist, but it would be nice if some gpc people can give also some feedback to fix it. Have a nice day Karim __________________________________________________________________ Gesendet von Yahoo! Mail - http://mail.yahoo.de Logos und KlingeltÃ¶ne fÃ¼rs Handy bei http://sms.yahoo.de

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Re: implicit object pointer dereference
by Prof. A Olowofoyeku (The African Chief) 16 Jul '03

16 Jul '03

Peter N Lewis <peter(a)stairways.com.au> wrote: [...] > Could you describe the differences between Delphi "Classes" and GPC > objects? Hmmm - where does one start? I am not sure that this is the place to embark on a full discussion of this - but I will mention a few highlights. There are many similarities, since both are Borland's Pascal extensions. The main differences - with Delphi classes, 1. objects are implicitly pointers 2. fields are implicitly dereferenced 3. you must always have at least one constructor (you can have as many as you want) and you must call a constructor before doing anything with the object, 4. the constructor call automatically allocates memory for the object (via compiler and/or RTL magic - don't know which), and then does whatever else you actually do in the constructor - so a constructor is a special type of method, which returns a pointer to the object 5. the constructor call is made by assigning the instance to the constructor - e.g., objvar := myobject.myconstructor; 6. you must always call a destructor if you wish to free memory used by the object (else you will get memory leaks) 7. the destructor call automatically frees memory for the object (via compiler and/or RTL magic - don't know which), after doing anything else that you tell it to do - so a destructor is a special kind of method, which (inter alia) frees the object's memory 8. virtual methods are overridden with the "override" directive, else you just get a duplicate method (or a compiler error? - don't remember which) 9. Because we are dealing with pointers, all descendants of the object are type-compatible with the ancestors (I can't recollect whether this is actually a difference or not) - e.g., type obj1 = class ... ... end; obj2 = class (obj1) end; obj3 = class (obj2) end; procedure foo (parm : obj1); ... var inst3 : obj3; ... foo (inst3); { legal } ... This is all I can think of at the moment ... Best regards, The Chief --------- Prof. Abimbola Olowofoyeku (The African Chief) Web: http://www.bigfoot.com/~african_chief/

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Ports to 3.2.x, 3.3.x ...
by Mirsad Todorovac 15 Jul '03

15 Jul '03

Hi, all! Is there anybody to tell me what is the status of 3.2.x and 3.3.x ports of GPC? Are there any big issues like conversion from obstacks to garbage collector was in 3.x, and when it could be hoped for. I was interested because it could help GPC being officially supported in main GCC package of our country's University network. The packager is insisting on new shiny versions (relativelly fresh 3.3), yet I'm trying to negotiate inspite his official support. Thanks, Mirsad -- "I have a dream!" -- Martin Luther King Jr.

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Changed behavior in 20030507
by J. David Bryan 15 Jul '03

15 Jul '03

I am working with gpc-20030507 (with gcc-3.2.3, i486-pc-mingw), and I have noted two changes in compiler behavior from gpc-20021128. I don't know whether these are bugs or intentionally revised features. 1. The "addr" function no longer observes the --no-typed-address command line switch. The GPC manual says: --no-typed-address Make the result of the address operator an untyped pointer (same as {$T-}). ...and: Addr returns the address of its argument. It is equivalent to the address operator.... ...so I would expect that "addr" and "@" would behave the same. They did under gpc-20021128. However, this now fails to compile with "--no-typed-address": program addrtest; var i : integer; a, b : ^ byte; begin a := @ i; { ok if --no-typed-address, fails otherwise } b := addr (i); { fails always, "incompatible pointer type" } end. 2. Using an interface-only module to declare routines in an exernal library no longer works. The importing program declares an external to "_init_<module-name>", but no entry point is provided by the module, so the program won't link. The GPC manual says: To use a function written in another language, you need to provide an external declaration for it - either in the program, or in the interface part of a unit, or an interface module. So I would think that the following would work: [ifmod.pas] module ifmod interface; export ifmod = (proc); procedure proc; end. [iftest.pas] program ifbug; import ifmod (proc); begin proc end. They both compile but fail during linking (presuming a library is supplied that declares "_Proc" as an entry point) with an undefined reference to "init_Ifmod". This worked in gpc-20021128 because "iftest.o" did not reference the "_init_Ifmod" entry point. -- Dave

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Segfault with --enable-keyword
by J. David Bryan 14 Jul '03

14 Jul '03

Running gpc-20030507 with gcc-3.2.3 (i486-pc-mingw32), I wish to compile in Extended Pascal mode but also allow the "external" keyword. With "ifmod.pas" containing: module ifmod; export ifmod = (proc); procedure proc; external; end; end. ...and compiling this with: gpc --extended-pascal --enable-keyword=external -c ifmod.pas ...I get: gpc1.exe: internal error: Segmentation fault Please submit a full bug report, with preprocessed source if appropriate. See <URL:http://www.gnu-pascal.de/todo.html> for instructions. In fact, I can produce the same error with just: gpc1 -fenable-keyword=x ...from the i486-pc-mingw32/3.2.3 subdirectory. I have reproduced this on the Chief's distribution as well. -- Dave

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(2. try) Make error with gpc under FreeBSD
by Karim Forsthofer 14 Jul '03

14 Jul '03

Hello I also tried to compile the newer version of gcc and gpc. I downloadet gpc-20030507 and gcc-3.2.1 from the gnu-pascal page. The configure script worked also fine. But make puts errors on the screen. Here is the msg: conflicts: 7 shift/reduce /usr/home/name/gcc-3.2.1/gcc/intl/plural.y : expected 10 shift/reduce ***Error code 1 Stop in /usr/home/name/gpc-build2/gcc/intl/ etc. I made a new dir with the name gpc-build2 (because of the old version). Can anybody help me with this ? __________________________________________________________________ Gesendet von Yahoo! Mail - http://mail.yahoo.de Logos und KlingeltÃ¶ne fÃ¼rs Handy bei http://sms.yahoo.de

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Gpc July 2003