- Gpc - gnu.de

Line numbers in error msgs
by Paul Davidson 26 Jul '03

26 Jul '03

Looked at GPC and GCC command line options for ability to give line number (when applicable) of error in source code. Currently am seeing messages like: lists.pas:1: error: parse error before `:' Is there way to get the actual line number in code where the offending syntax lives? Thank you

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Linking the libgpc to be shared
by "Nick Ioffe 26 Jul '03

26 Jul '03

Hi! I've tried to make my libgpc be shared. I work on HP SuperDome - hppa2.0w-hp-hpux11.00 (or at least the configure calls it so). I've tried to install gpc based on gcc-2.95.X unsuccesfully so I've installed gpc-20030509 based on gcc-3.2.1. Everything worked OK. But libgpc installed as static despite WITH_SHARED=yes option. After checking p/rts/Makefile I've pointed out that in that file WITH_SHARED= i.e. is just empty. After fixing it and making inside the rts I've got the following: nm: libgpc.so.2.1.20030509 not found. It was because of -Wl,-soname=libgpc.`cat ...` option specified to xgcc on the linking step. Eliminating it didn't help, now I got another error: LD: DP relative code in file /var/tmp/xxx.o - shared library ... Adding the -fPIC option used in building the *.lo files to linking command helped. Now the question - why configure doesn't do all these things? Also before that I got some strange errors when configure erroneusly created rts-config.h file - it didn't found open64 and usleep functions in /usr/local/include/fcntl.h - it was discovered by compiler. Any ideas, why? Thank you in advance, Nick

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uninitialized Output
by "Nick Ioffe 24 Jul '03

24 Jul '03

Hi! I'm trying to run some pascal with java. After Markus Gerwinsky help and some hard work getting libgpc to be shared library it is possible. The problem that the first example I tried was printing something from Pascal with writeln. Then I got a runtime error that Output variable is uninitialized. Shouldn't gpc work with standard descriptors or the StdOut, StdErr and the rest should be initialized somehow? also how should I initialize them? To what device/descriptor etc? opening file and writing into it works. Nick

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Shared libraries using GPC and JNI
by nick 23 Jul '03

23 Jul '03

Hi! I'm trying to use some old Pascal modules in Java through JNI. 1. Is there any way of using Pascal directly or should I use it through C? 2. How should I create the mixed shared library (i.e. library containing C and Pascal objects) 3. What version of GPC and GCC is it prefferable to use? Thank you in advance, Nick

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-Wpacked
by Adriaan van Os 22 Jul '03

22 Jul '03

The warning argument -Wpacked issues the following warning while compiling any source (program or unit): [G4:~/gnu/testgpc/adriaan] adriaan% gpc hello.pas -Wpacked hello.pas:0: warning: packed attribute is unnecessary for `Datevalid' 'Datevalid' is the first field of the GPC internal variable GPC_TimeStamp (in p/rts/time.pas). It should be noted that -Wpacked issues warnings per field, not per record. This suggests that in the compiler back-end packing is a field-attribute, not a record attribute. This would also explain that "Datevalid' does not need a packed attribute (because it is the first field in the record) although GPC_TimeStamp is densely packed. I don't know whether this is target-platform dependent or not. 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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CRT unit help
by Francisco Javier F. 22 Jul '03

22 Jul '03

I need to use the crt unit, but the compiler says that crt unit is not found: module/unit interface `Crt' could not be imported. Â¿Where is is supposed to be? thanx -- Now proudly running Debian Sid+ kernel 2.4.21 + XFS

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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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