Gpc July 2002

gpc@gnu.de

9 participants
12 discussions

Comparision Cardinal/Integer Bug?
by Eike Lange 05 Sep '02

05 Sep '02

Hi Folks! I don't know whether it's a feature or a bug, I didn't find it on the list of known bugs so here is my report: Comparisions between Cardinal and Integer may fail, if the Integer value is negative. Version: 2.1 (20020510), based on gcc-2.95.2 19991024 (release) program testcase; var aCard: Cardinal; aInt: Integer; begin aCard := 1; aInt := -1; { "FAIL" } if (aCard > aInt) then WriteLn ('OK') else WriteLn ('FAIL'); { "FAIL" } if (aCard > -1) then WriteLn ('OK') else WriteLn ('FAIL'); { just for completness: "OK" } if (1 > -1) then WriteLn ('OK') else WriteLn ('FAIL') end. BTW: The gcc C fontend does the same. Eike

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ANN: XLib-Unit
by Eike Lange 29 Jul '02

29 Jul '02

Hi! Welcome to the wonderful world of XLib Unit. This unit interfaces Xlib.h and X.h. Xlib is a very basic library you may need for creating graphical user interfaces (GUI). If you need some documentation about XLib-Programming, please visit the following sites: (I am not responsible for the contents of these sites) * http://www.tronche.com/gui/x/xlib/introduction/ * http://www.rahul.net/kenton/xsites.framed.html It would be wonderful, if someone could review this unit. Download from: http://gnu-pascal.de/contrib/eike/ Eike

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operators
by Kresimir Veselic 25 Jul '02

25 Jul '02

Dear gpc-ers, here is a question by an unskilled programmer: Upon the program program driver0; {$I complexop.p} var a,b,c,d: scomplex; begin a.re := 1; a.im := -0.1; b := a; c := b * b; c := a + c; d := c + b * b; writeln(c.re,' ',c.im); end. the gpc compiler reacts: driver0.p: In main program: driver0.p:10: reference expected, value given However if the incriminated line 10 (d := c + b * b) is commented out the program compiles and executes ok. The include file contains overloaded operations + and * for complex numbers as records. Can you tell what is wrong without looking into the (rather long) include file. Thanks in advance, K. Veselic.

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Problems installing GPC
by Preben Mikael Bohn 24 Jul '02

24 Jul '02

Hi all, I have a problem installing both the gcc and the gpc compiler. I use the following (taken directly from http://www.gnu-pascal.de/gpc_51.html#SEC51 ): tar xzf gpc-20020510.tar.gz tar xzf gcc-core-2.95.2.tar.gz cd gpc-20020510 mv p /export/athen01/prb/programs/gcc-2.95.2/gcc/ cd .. mkdir gpcbuild cd gpcbuild /export/athen01/pmb/gpc/gcc-2.95.2/configure --prefix=/export/athen01/pmb/gpc make make -n install make install At the last step I get the following error: chmod a-x "/export/athen01/pmb/gpc/doc/gpc/BUGS" "/export/athen01/pmb/gpc/doc/gpc/demos"/* if [ "`cd p/docdemos && echo a*`" != "a*" ]; then \ (cd "/export/athen01/pmb/gpc/doc/gpc/docdemos"; for f in *; do rm -f "$f"; done) && \ for f in `cd p/docdemos && echo *`; do \ rm -f "/export/athen01/pmb/gpc/doc/gpc/docdemos/$f"; \ /bin/sh /export/athen01/pmb/gpc/gcc-2.95.2/install-sh -c -m 644 "p/docdemos/$f" "/export/athen01/pmb/gpc/doc/gpc/docdemos/$f" && \ chmod a-x "/export/athen01/pmb/gpc/doc/gpc/docdemos/$f" || exit 1; \ done; \ fi install: p/docdemos//export/athen01/pmb/gpc/gpcbuild/gcc/p/docdemos does not exist make[1]: *** [pascal.real-install-doc] Error 1 make[1]: Leaving directory `/export/athen01/pmb/gpc/gpcbuild/gcc' make: *** [install-gcc] Error 2 And gcc is not build. The strange thing is that it works flawlessly on another RedHat 7.3 system... On the RH7.3 I use gcc version 2.96 20000731 (Red Hat Linux 7.3 2.96-110). On the "failure"-system I'm using gcc version 2.96 20000731 (Red Hat Linux 7.1 2.96-98) Any ideas what is wrong??? Best regards Preben Bohn ===== Computers are like airconditioners: They stop working properly if you open windows. __________________________________________________ Do You Yahoo!? Everything you'll ever need on one web page from News and Sport to Email and Music Charts http://uk.my.yahoo.com

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Latest sources...
by Orlando Llanes 18 Jul '02

18 Jul '02

Where can I find the latest sources? I checked on the web site but was confused and downloaded the wrong thing. Also, does GPC still require Linux in order to be compiled properly? See ya! Orlando

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Re: GPC GMP units
by da Silva, Joe 18 Jul '02

18 Jul '02

Have you tried the "--autobuild" command line option? Joe. > -----Original Message----- > From: Kresimir Veselic [SMTP:Kresimir.Veselic@FernUni-Hagen.de] > Sent: Thursday, July 18, 2002 7:01 PM > To: gpc(a)gnu.de > Subject: GPC GMP units > > Dear GPC-ers, > > my gpc, version 2.1 (20020510), based on gcc-2.95.3 20010315 (release) > does not find the units GPC and GMP, upon compilation of the demo program > fibonacci.pas I get > > fibonacci.pas:31: module/unit interface `Gpc' could not be imported > > The same with GMP. What is wrong? > > Thanks, K. Veselic. >

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Re: range checking in GPC
by da Silva, Joe 18 Jul '02

18 Jul '02

Range checking is not currently implemented in GPC. There has been debate in the past about what priority to give this and just who is willing to do it. However, IMHO, GPC should at least allow the range checking directive to be used, even if it doesn't do anything. I expect this oversight will be addressed in the near future. Joe. > -----Original Message----- > From: Kresimir Veselic [SMTP:Kresimir.Veselic@FernUni-Hagen.de] > Sent: Thursday, July 18, 2002 6:37 PM > To: gpc(a)gnu.de > Subject: range checking in GPC > > Dear GPC-ers, > > Upon including a range checking directive in the program > > program test1; > {$R+} > const nmax = 6; > type nrange = 1..nmax; > var n : nrange; > begin > read(n); writeln(n); > end. > > and compiling with > > gpc --borland-pascal test1.p > > the compiler answers: > > test1.p:2: warning: unknown compiler directive `r+' > > My questions: (i) In the gpc manual on p. I read ... "all of BP > compiler directives are supported by GPC..." > {$R+} is one of them. Why the reaction above? > > (ii) is there any possibility of range checking with GPC? I could not > find the expression "range checking" in the manual text. > > Thanks in advance, K. Veselic. >

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GPC GMP units
by Kresimir Veselic 18 Jul '02

18 Jul '02

Dear GPC-ers, my gpc, version 2.1 (20020510), based on gcc-2.95.3 20010315 (release) does not find the units GPC and GMP, upon compilation of the demo program fibonacci.pas I get fibonacci.pas:31: module/unit interface `Gpc' could not be imported The same with GMP. What is wrong? Thanks, K. Veselic.

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range checking in GPC
by Kresimir Veselic 18 Jul '02

18 Jul '02

Dear GPC-ers, Upon including a range checking directive in the program program test1; {$R+} const nmax = 6; type nrange = 1..nmax; var n : nrange; begin read(n); writeln(n); end. and compiling with gpc --borland-pascal test1.p the compiler answers: test1.p:2: warning: unknown compiler directive `r+' My questions: (i) In the gpc manual on p. I read ... "all of BP compiler directives are supported by GPC..." {$R+} is one of them. Why the reaction above? (ii) is there any possibility of range checking with GPC? I could not find the expression "range checking" in the manual text. Thanks in advance, K. Veselic.

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None
by Kresimir Veselic 18 Jul '02

18 Jul '02

Dear GPC-ers, it seems that the complex arithmetic under GPC is not well implemented: (i) there is only one complex type, the one whose real and imaginary part are double precision reals. For numerical applications complex numbers in single and extended precision are needed as well (in fact, just the availability of these three real precisions is what makes gnu-pascal attractive in this context). (ii) the complex arithmetic of GPC lacks the elementary accuracy; see the following program program complmult; var a : complex; b : double; begin b := 1e+160; a := cmplx(b,0); writeln('abs(b) = ',abs(b)); writeln('abs(a) = ',abs(a)); end. Upon execution the results are abs(b) = 1.000000000000000e+160 abs(a) = Inf which is below even elementary standards. GNU g77 has none of the mentioned shortcomings, cannot one repair this? Sincerely, K. Veselic.

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Gpc July 2002