Gpc September 2000

gpc@gnu.de

18 participants
24 discussions

GDB pascal support.
by Pierre Muller 05 Sep '00

05 Sep '00

I now have committed into GDB CVS tree my main patches to add pascal support into the GNU Debugger. To test it out, simply go to sourceware.cygnus.com/gdb and see the CVS checkout instructions. I have an unsubmitted patch that would handle GNU Pascal TP like Strings better, but as my GNU Pascal knowledge is close to zero, I would like to know if someone is working with the CVS tree of GDB? Currently, only Free Pascal strings are printout in a pascalisch way, whereas GNU pascal strings are printed out as records. Pierre Muller Institut Charles Sadron 6,rue Boussingault F 67083 STRASBOURG CEDEX (France) mailto:muller@ics.u-strasbg.fr Phone : (33)-3-88-41-40-07 Fax : (33)-3-88-41-40-99

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using c++ libraries in pascal (NEWBIE)
by Menno Schaap 05 Sep '00

05 Sep '00

Hello, I am new to this list, so "HELLO TO EVERYBODY" About my programming subject: I am investigating for a small naval architectural bureau, If they can port their DOS/WIN pascal programs to linux. I am a student of naval architecture with small programming experience under Pascal and C++. The company also asked me to have a look at GUI toolkits and write a graphical subsystem for their pascal program. I would like to use QT for this purpose. I made some small tests already, and found out that the compatibility with GPC and Prospero extended pascal is sufficient (small problems). My problem is that I can not use a c++ library in my pascal program. For C everything works allright, but as soon as I compile with g++ I get errors. I also noticed that the assembler output of the compiler is different when compiling C or C++ sources. I tried compiling with gpc -x, etc. Still I run into problems. I use gpc based on egcs 1.1.2 as well as based on gcc 2.95.2 (on two different pc's). Attached is a small, very dumb test program, partially stolen from the excellent info pages of gpc. It consists of two files: add_one.c and test.pas test.pas is the program; it writes the number five, and lets the function number_pp add one (+1) to the number. It then displays number again. I compiled it in several ways, of which this one is the simplest: gcc -c add_one.c gpc -o test test.pas add_one.o If the first line is replaced with: g++ -c add_one.c line number two fails linking. Does anybody have an idea of how to use c++ libraries in pascal? Help is very much appreciated. Greetings, Menno Schaap

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From C To Pascal, Files
by Eike Lange 05 Sep '00

05 Sep '00

Hi alltogether! Its for the PostgreSQL-Unit. In C, I have a function: void printSomethingToFile(File* file); for which I want to write a wrapper. What I did was: ----------------- snip -------------- In C: void _p_printSomethingToFile(int file_descriptor) { FILE *myfile; myfile = fdopen(file_descriptor, "w"); /* if (errno != 0) printf("errno is %d\n"errno); */ printSomethingToFile(myfile); /* fflush(myfile); */ } Pascal (Unit-Part): Procedure CprintSomethingToFile(int file_descriptor); asmname '_p_printSomethingToFile'; Procedure PrintSomethingToFile(aFile : Text); Var fd : Integer; Begin fd := FileHandle(aFile); CprintSomethingToFile(fd) End; Pascal (Program) Var f : Text; Begin ... Assign(f, 'filename.out'); Rewrite(f); PrintSomethingToFile(f); Close(f); ... End. ----------------- snip -------------- Sometimes this works (especially, if I write a line of text _before_ I use PrintSomethingToFile) and sometimes it fails because errno is set to a value <> 0 after calling fdopen. If I use fflush(myfile) after (in C) printSomethingToFile(myfile) it seems to work. The text is written propely, but errno is <>0 ! errno is mostly set to "Bad File Descriptor". Is there something, I did wrong? Eike Lange

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Pascal-documentation in german language
by Eike Lange 05 Sep '00

05 Sep '00

Hi! I'm writing a documentation about "Pascal under Linux" and I think, I need some help :-) If you would like to join me, please try out http://www.eliotic.de/pasdoc/ and contact me: eike.lange(a)uni-essen.de Eike Lange

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Gpc September 2000