Gpc

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5400 discussions

Re: Compilation error
by Peter Gerwinski 08 Sep '96

08 Sep '96

> When I try to compile anything, even the simplest program, I get: > /usr/i486-linux/bin/ld: cannot open crt0.o: No such file or directory Perhaps the versions of GCC and GPC you are using don't coincide. Please check the following: gpc -c myprogram.pas gcc myprogram.o -o myprogram i.e. compile with GPC, but link with GCC. Did you already check that crt0.o is in a directory where GPC can find it? I remember some problems when I had crt0.o in the directory /usr/lib/gcc-lib/i486-unknown-linux/2.6.3. The problems disappeared when I moved the file to /usr/lib or /usr/local/lib. Good luck, Peter e-mail: peter.gerwinski(a)uni-essen.de home address: D\"usseldorfer Str. 35, 45145 Essen, Germany WWW: http://agnes.dida.physik.uni-essen.de/~peter/

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Re: External, C, AsmName, ...
by Peter Gerwinski 08 Sep '96

08 Sep '96

According to Berend de Boer: > Can we not simply see a C .h file as an interface-only module? I mean I can > simply import a c .h file which gpc parses and all symbols defined in that > header file are exported symbols? This would mean that GPC would have to parse C source. Remember that #include "foo.h" or (*$include "foo.h" *) just means that GPC treads the file `foo.h' just if its contents were written in our source file. A Pascal program using this mechanism would in fact look like the following: Program Test; extern int foo; extern void ioctl (int fildes, int cmd, ...); begin [...] end. You don't actually want this. ;-) > I don't know how far this is feasible. And it doesn't cover a.out modules > creating using other languages (GNAT, ...). But it does cover the majority of > cases you need externals. You can write a C header file for everything you want to import, independently of the language it was originally written in. Our point is that it must also be possible to write a *Pascal* interface for everything we want to import. Peter e-mail: peter.gerwinski(a)uni-essen.de home address: D\"usseldorfer Str. 35, 45145 Essen, Germany WWW: http://agnes.dida.physik.uni-essen.de/~peter

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Re: External, C, AsmName, ...
by Berend de Boer 07 Sep '96

07 Sep '96

> Now I am looking out for reasonable ideas. Can we not simply see a C .h file as an interface-only module? I mean I can simply import a c .h file which gpc parses and all symbols defined in that header file are exported symbols? I don't know how far this is feasible. And it doesn't cover a.out modules creating using other languages (GNAT, ...). But it does cover the majority of cases you need externals. Groetjes, Berend.

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Accessing external functions (was: Newbie question)
by Peter Gerwinski 06 Sep '96

06 Sep '96

Hello Patricio, > I currently teaching Operative System to students who only know Pascal, > so I'd like to know if we can use > Unix System calls in pascal programs wirh GPC ? I mean stuff like > 'fork()', 'exec()', etc... You can access any function using the "external", "C", and "asmname" directives: Procedure fork; external; means: there is an external Procedure "Fork" (first letter uppercase), Procedure fork; C; means: there is an external Procedure "fork" (everything lowercase), and Procedure fork; asmname 'foO'; means: there is an external Procedure with the funny name "foO" (last letter is uppercase in this example) which can be accessed from Pascal via the name "fork". Good luck, Peter

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Newbie question
by Patricio Domingues 06 Sep '96

06 Sep '96

Hi, I currently teaching Operative System to students who only know Pascal, so I'd like to know if we can use Unix System calls in pascal programs wirh GPC ? I mean stuff like 'fork()', 'exec()', etc... Thanks in advance, Patricio.

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Subscribe GPC's mail list
by Patricio Domingues 06 Sep '96

06 Sep '96

Thanks.

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Compilation error
by John Michael Black 03 Sep '96

03 Sep '96

Hi all. I've had this error ever since I installed gpc, and I've never figured out why. I'm not all that experienced at unix. When I try to compile anything, even the simplest program, I get: /usr/i486-linux/bin/ld: cannot open crt0.o: No such file or directory Sorry if this seems like such a stupid question. Any ideas? -john

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Problem with constant strings in gpc 1.2(2.7.2)#7 ???
by Peter Gerwinski 31 Aug '96

31 Aug '96

According to Harry Reed: > In the users' manual chapter "About Pascal and Extended Pascal > languages" > there is a small example on how to initialize constant strings. When I > try > compiling the fragment with gpc 1.2(2.7.2)#7 I get the error messages > as showm below. Is this a valid bug or am I just doing something wrong? Extended Pascal initialized *structured* variables are not (yet) implemented into GPC, only (parts of) Borland Pascal style initializers. However some fragments of Extended Pascal initializers *do* exist in gpc-parse.y, but I don't know when they will work. Everybody be invited to help implementing this! > MyStrings : array [1..MyStringsCount] of Ident value [ Square brackets do not work. Use parantheses instead. ^ > 1:'EXPORT'; 2:'IMPLEMENTATION'; 3:'IMPORT'; You may specify Indices etc., but they are ignored completely. Even worse: Initialization of Strings does not work at all. Only "simpler" types, i.e. array/record combinations containing Integers, Reals, etc. work. This is a known bug, but I forgot to document it. Thank you for pointing me to it. > PS: Great work on GPC! Keep it up!!!! Thanks a lot. :-) :-) I will continue unless somebody makes big efforts to stop me. ;-) Peter

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Problem with constant strings in gpc 1.2(2.7.2)#7 ???
by Harry Reed 30 Aug '96

30 Aug '96

Hi, In the users' manual chapter "About Pascal and Extended Pascal languages" there is a small example on how to initialize constant strings. When I try compiling the fragment with gpc 1.2(2.7.2)#7 I get the error messages as showm below. Is this a valid bug or am I just doing something wrong? Cheers, Harry Reed doon(a)hrc.nevada.edu PS: Great work on GPC! Keep it up!!!! source program --- cut here --- 8< --- cut here --- 8< --- cut here --- program test; const MyStringsCount = 5; type Ident = string(20); var MyStrings : array [1..MyStringsCount] of Ident value [ 1:'EXPORT'; 2:'IMPLEMENTATION'; 3:'IMPORT'; 4:'INTERFACE'; 5:'MODULE']; begin end. compiler output --- cut here --- 8< --- cut here --- 8< --- cut here --- test.pas: In function `test': test.pas:9: parse error before `:' test.pas:9: Set constructor elements must be of ordinal type test.pas:9: missing comma test.pas:9: parse error before `;' test.pas:9: missing comma test.pas:9: parse error before `:' test.pas:9: Set constructor elements must be of ordinal type test.pas:9: missing comma test.pas:9: parse error before `;' test.pas:9: missing comma test.pas:9: parse error before `:' test.pas:9: Set constructor elements must be of ordinal type test.pas:9: missing comma test.pas:9: parse error before `;' test.pas:10: missing comma test.pas:10: parse error before `:' test.pas:10: Set constructor elements must be of ordinal type test.pas:10: missing comma test.pas:10: parse error before `;' test.pas:10: missing comma test.pas:10: initial value is of wrong type

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gpc-2.7.2 for Linux-elf and Win32
by Peter Gerwinski 30 Aug '96

30 Aug '96

Hello folks, GPC-2.7.2 pre-release binaries for Linux-elf and Win32 (with CygWin beta 14) are now available on kampi and on agnes. Peter

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