Gpc July 2005

gpc@gnu.de

25 participants
67 discussions

Fwd: Forward defined types (and object
by Frank Heckenbach 09 Jul '05

09 Jul '05

marcov(a)stack.nl: : In gmane.comp.compilers.gpc, you wrote: : : Gale's msg reminded me of more Delphi syntax regarding forward defines. It is not : directly related to Gales remark (I also think that inheriting from forward defined : classes/objects shouldn't be possible, and so does Borland: "class not completely defined yet"). : : The detail I forgot is that inheritance info must match, so: : : Type : ta = class (SomeObject); // define forward : : tb = class : procedure dosomethingwith(a : ta); // I now have inheritance info about ta here. : end; : : ta = class (someobject) : x : integer; : end; : : : and not e.g. : : Type : ta = class; // define forward. However this is effectively class(tobject), inheriting from the base object : : tb = class : procedure dosomethingwith(a : ta); // I now have inheritance info about ta here. : end; : : ta = class (someobject) // ta already defined error here. : x : integer; : end;

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Re: packing strings ()
by Contestcen＠aol.com 08 Jul '05

08 Jul '05

> How can a preprocessor (macro compiler) help here, when it runs at > compile time, while time question was clearly about runtime storing > of strings (mentioning New and block moves etc.)? I assumed that the strings were being stored at runtime because storing them end-to-end at compile time was too tedious. If there is a static set of strings, then the Pascal Macro Compiler can store them without any wasted space. If additional strings need to be added to that set at runtime, it is easy to write a procedure to append them to the character array so that all of the strings are accessed the same way. This avoids the use of the New procedure, except if you use it for handling array overflow. I don't know the internals of the GPC New procedure, but in various environments where I have worked in the past there was no guarantee that successive calls to New would allocate adjacent blocks of storage, hence no guarantee that there would be no gaps or wasted space. It all depended on what sequence of calls to New and Dispose had occurred earlier. Frank Rubin

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Re: Forward defined types (and object references)
by Peter N Lewis 08 Jul '05

08 Jul '05

At 9:07 +0200 6/7/05, Marco van de Voort wrote: > > marcov(a)stack.nl wrote: > >> > Delphi supports this: (remember its object model is similar) >> > >> > Type > > > MyObjectB = class; > > > MyObjectA = class; >> >> This seems to be what `class .. end' is in OOE. >> >> > Must be in one typeblock though, IOW, the same system as pointers. >> >> Yes, same in OOE. > >Does CW work like OOE in this regard? No, CW does not accept either syntax: MyObject = object; nor MyObject = object .. end; CW takes the approach that any unknown type identifier it sees in a type definition is pointer sized (a pointer or object) and must be defined by the end of the type block. type rec = record a: UndefinedA; b: UndefinedB; end; UndefinedA = ^Integer; UndefinedB = object end; Note that UndefinedA = UInt32 is not legal, it must be a pointer or object. It's actually not a bad methodology and makes it easy to write data structures that is self or mutually referential, but it does not add anything over pre defining pointers or object names as EP/Delphi. >Note that afaik there is no solution for BP style objects, and actually you >don't really need it, since in practice you always work with references >(explicit pointers). There is still this case: type proc = procedure ( var o: MyObject ); MyObject = object f: proc; end; But I agree, in practice with non-reference objects, the issue is a lot less prevalent. Enjoy, Peter. -- <http://www.stairways.com/> <http://download.stairways.com/>

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Stable version?
by Silvio a Beccara 08 Jul '05

08 Jul '05

Good morning everybody, sorry, but still noone has answered my question about the download of a stable source version for GPC. Is there any available? If so, where? Can you give me directions as how to compile and install GCC locally (i.e. as non-root) and then GPC in the same way? Thank you very much, best regards Silvio a Beccara -- Email.it, the professional e-mail, gratis per te: http://www.email.it/f Sponsor: Manuali.net pensa alla tua formazione con corsi per tutte le professioni e dal costo contenuto. * Dalla Sicurezza alla Grafica, dal PC alla programmazione....Clicca qui Clicca qui: http://adv.email.it/cgi-bin/foclick.cgi?mid=3414&d=7-7

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... forgot
by Silvio a Beccara 07 Jul '05

07 Jul '05

Which GCC version should I compile to compile the latest GPC snapshot (the only downloadable file at the time being)? Silvio a Beccara -- Email.it, the professional e-mail, gratis per te: http://www.email.it/f Sponsor: Iscriviti GRATUITAMENTE: ci sono 5 Euro che ti aspettano .e decine di corsi... * Clicca qui: http://adv.email.it/cgi-bin/foclick.cgi?mid=3416&d=7-7

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GPC-20050331 compilation error for unit name conflict
by mingeborg＠aol.com 07 Jul '05

07 Jul '05

Hello, I noticed that GPC-20050331 generates compilation errors if a unit (included in a uses... statement) is named the same as a function identifier or type identifier. Is this intentional, known, or should I send a short example program? Thanks, - Inga

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Re: packing Strings()?
by Contestcen＠aol.com 07 Jul '05

07 Jul '05

<< I often need to store a lot of strings, and don't want to waste the space allocated to a String(255) for each one. With "short" strings, I just allocate memory (with the Mac system NewPtr routine, not with the Pascal New routine) for Length(s)+1 bytes, and then BlockMove the string in. This has the advantage that the string can be references as just Str255Ptr(s)^ (sometimes the size needs to be aligned to 2 or 4 bytes, depending on the platform). >> The Pascal Macro Compiler has a set of macros that will pack character strings without any wasted space between them The macros can be downloaded directly from the webpage http://www.contestcen.com/paskey.htm which has both the source code and a detailed description. Frank Rubin Master Software Corp.

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Libraries
by Silvio a Beccara 06 Jul '05

06 Jul '05

Good morning, I installed the gpc with gcc binary on a Linux machine (file gpc-2.1-with-gcc.i686-pc-linux-gnu.tar.gz), executed install-gpc-binary, updated ~/.bashrc with GPC_EXEC_PREFIX, but when I try to execute gpc, I get the following error: gpc: /lib/i686/libc.so.6: version `GLIBC_2.3' not found (required by gpc) So I put the library libc-2.3.3.so in the directory /home/usr/local/lib/gcc-lib/i686-pc-linux-gnu/2.95.2 and updated the library path, putting in ~/.bashrc the following line: LIBRARY_PATH=$LIBRARY_PATH:/clx/userunivts/utsts007/silvio/src.dev3.old/old/usr/local/lib/gcc-lib/i686-pc-linux-gnu/2.95.2 but the error does not go away. On another machine, it goes like a breeze. Does anybody have a solution? Thanks in advance, best regards Silvio a Beccara Trieste - Italy -- Email.it, the professional e-mail, gratis per te: http://www.email.it/f Sponsor: Solo su Occhialeria.it una vastissima scelta a prezzi insuperabili! * Per te le migliori marche e un incredibile assortimento. Clicca qui: http://adv.email.it/cgi-bin/foclick.cgi?mid=880&d=5-7

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packing Strings()?
by Peter N Lewis 06 Jul '05

06 Jul '05

I often need to store a lot of strings, and don't want to waste the space allocated to a String(255) for each one. With "short" strings, I just allocate memory (with the Mac system NewPtr routine, not with the Pascal New routine) for Length(s)+1 bytes, and then BlockMove the string in. This has the advantage that the string can be references as just Str255Ptr(s)^ (sometimes the size needs to be aligned to 2 or 4 bytes, depending on the platform). I could do the same thing with GPC's Schema String(255), but I'd have to pack them in, and then unpack them out to a temporary variable to access them, I could not access them in place in the packed data block. I presume there are clever ways to do such things in GPC/EP? What would be the options for packing strings into a block of memory and yet still having them usable? Thanks, Peter. -- <http://www.stairways.com/> <http://download.stairways.com/>

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gpc-20050331 on gcc-3.4.3 build problem
by mingeborg＠aol.com 05 Jul '05

05 Jul '05

Hi. I'm trying to build gpc-20050331 on gcc-3.4.3, on an I686 running Suse 9.1. I'm getting the following when I am trying to run make: /home/siemionf/newsoftware/gcc-3.4.3/gcc/gengtype-yacc.c -o gengtype-yacc.o gcc -g -O2 -DIN_GCC -W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes -pedantic -Wno-long-long -DHAVE_CONFIG_H -DGENERATOR_FILE -o gengtype \ gengtype.o gengtype-lex.o gengtype-yacc.o ../libiberty/libiberty.a gengtype.o(.text+0x9f6): In function `get_output_file_with_visibility': /home/siemionf/newsoftware/gcc-3.4.3/gcc/gengtype.c:1227: undefined reference to `_sch_istable' gengtype.o(.text+0x10c4): In function `adjust_field_type': /home/siemionf/newsoftware/gcc-3.4.3/gcc/gengtype.c:745: undefined reference to `_sch_istable' gengtype.o(.text+0x10fb):/home/siemionf/newsoftware/gcc-3.4.3/gcc/gengtype.c:750: undefined reference to `_sch_istable' gengtype.o(.text+0x1163):/home/siemionf/newsoftware/gcc-3.4.3/gcc/gengtype.c:764: undefined reference to `_sch_istable' gengtype.o(.text+0x1a48):/home/siemionf/newsoftware/gcc-3.4.3/gcc/gengtype.c:617: undefined reference to `_sch_toupper' gengtype.o(.text+0x2062): In function `walk_type': /home/siemionf/newsoftware/gcc-3.4.3/gcc/gengtype.c:1507: undefined reference to `_sch_istable' gengtype.o(.text+0x215c):/home/siemionf/newsoftware/gcc-3.4.3/gcc/gengtype.c:1528: undefined reference to `_sch_istable' gengtype.o(.text+0x2bb1):/home/siemionf/newsoftware/gcc-3.4.3/gcc/gengtype.c:1748: undefined reference to `_sch_istable' gengtype.o(.text+0x3ccc): In function `put_mangled_filename': /home/siemionf/newsoftware/gcc-3.4.3/gcc/gengtype.c:2364: undefined reference to `_sch_istable' gengtype.o(.text+0x4da5): In function `main': /home/siemionf/newsoftware/gcc-3.4.3/gcc/gengtype.c:2674: undefined reference to `_sch_istable' gengtype-lex.o(.text+0x7be):/home/mitchell/scratch/gcc-3.4.3/gcc-3.4.3/gcc/gengtype-lex.l:248: more undefined references to `_sch_istable' follow collect2: ld returned 1 exit status make[1]: *** [gengtype] Error 1 make[1]: Leaving directory `/home/siemionf/newsoftware/gpc-build/gcc' make: *** [all-gcc] Error 2 Thanks for any help with this. - Inga

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Gpc July 2005