Gpc October 2001

gpc@gnu.de

45 participants
80 discussions

please help with data conversion
by Miguel A Pérez E 13 Oct '01

13 Oct '01

Hello, please forgiveme if this is a trivial question. I have an integer variable and I am looking for the easiest way to convert it to an ascii or hexa form. sNumber := HexaToAscii( '30414439'); Then sNumber results in '0AD9' But the string '30414439' is in hexa and it corresponds with the decimal number 809583673. What function will allow me to obtain that hexa string or the ascii string from the integer number? Thank you in advance. Miguel PÃ©rez

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GDB scope does not work quite right for Pascal
by Pierre Muller 13 Oct '01

13 Oct '01

At 14:44 12/10/01 , vous avez écrit: > >Number: 222 > >Category: gdb > >Synopsis: GDB scope does not work quite right for Pascal > >Confidential: no > >Severity: non-critical > >Priority: medium > >Responsible: unassigned > >State: open > >Class: sw-bug > >Submitter-Id: net > >Arrival-Date: Fri Oct 12 05:48:01 PDT 2001 > >Closed-Date: > >Last-Modified: > >Originator: Adam Oldham > >Release: gdb 20010813 > >Organization: > >Environment: >Mandrake 8.1, Kernel 2.4.8, glibc 2.2, Intel Platform > >Description: >Source is compiled with FPC (Free Pascal Compiler). This can happen with >any source of pascal. When you declare nested functions, gdb's scope does >not allow the viewing of the variables that are from the parent function >that should be within the scope. > >How-To-Repeat: >The simple program attached will produce the problem. When compiled and >run, the correct output is displayed, but if you run GDB on it, and break >on function test2 and print out int1 which is a global variable for the >function test1, you receive: >"No symbol "INT1" in current context." There are several remarks to that bug report: 1) I don't know at all how nested functions work in C Are they allowed? Do they also use a paremt fram pushing method ? If yes, can locals from the calling function be found in C? Maybe someone from the gdb mailing list can answer that question. If this is already implemented for C its probably easier to just take the same method. 2) There is a solution, I implemented it in the IDE for Free Pascal but it is rather complicated. Let me try to explain this solution to everyone. Nested functions in pascal get a hidden parameter that contains the frame pointer (ebp value for i386 cpu) of the calling function. This allows the program to access correctly local variable of the function that called the nested function. This value is searched in the backtrace at the location where the frame pointer are usually saved ( i.e. at offset 0 of the local ebp value for i386) If we find the corresponding frame (which is not always the first frame above the current one) then we can try if we find the unfound local symbol in that frame). To ease this search, I inserted a pseudo-parameter to the function called parent_ebp (in lower case, while normal Free Pascal symbols are uppercased) that indicate the location of this parnt frame pointer. 3) As maintainer of the pascal language specific part of GDB, I am of course willing to introduce this into the gdb sources, but I would really like to get first some feedback from the gpc list. Does gpc do anything about this calling frame hidden parameter ? Could we agree to use the same method for both compiler in order to get better support for Pascal ? 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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cannot exec gpcpp: no such file or directory
by dbrookmann＠t-online.de 13 Oct '01

13 Oct '01

Hi, When calling gpc to compile some hallo.p pascal program I get the following message: "gpc: Installation problem, cannot exec 'gpcpp': no such file or directory " I am using SuSE 7.2 and as far as I know I installed all the necessary files. Could you give me some reference where or how I can check the completeness, in particular: where should gpcpp be and where do I get it to put it there (I am new to linux ). Thanks Douglas P.S. I tryed to compare the filestructure in SuSE for the Mac with that for PC in respect to gpc and I gave up this mission when I saw the differences. My gpc on the Mac is working alright :-)

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Re: GDB scope does not work quite right for Pascal
by Pierre Muller 13 Oct '01

13 Oct '01

At 14:18 12/10/01 -0400, Oldham, Adam wrote: >Yes, I saw some of these threads, but nothing seemed to shed light on fixes >for the scoping of this. It is good to know Ada does this as well so that >maybe us Ada/Pascal people can get together and come up with a fix. > >I submitted code that demonstrates this with my bug report as well.... After some testing on both GNU C and GNU Pascal I discovered that they both use the same method (on djgpp i386 target) The calling frame pointer is passed to the nested function in %ecx register and stored in -4(%ebp) in the function prologue (which does not seem to be handled by skip_prologue function, at least I didn't find anything in version 5.0 sources) So the parent frame is placed in %ecx and stored at offset -4 for GNU gcc or gpc while it is pushed at offset 8 in Free Pascal code. Using -gstabs+ I saw nothing generated to explain the meaning of the %ecx parameter or the -4(%ebp) location. Checking the prologue for this movl %ecx,offset(%ebp) isn't probably sufficient to tell that we are in a nested proc... Moreover this is processor specific, which is bad... Stabs does give info about nesting in the stabs concerning the Consider the following source: int test () { int i = 1; int j; int local () { return j+1; }; j = i+1; return local (); } int main () { printf(" result of test() is %d \n",test()); return 0; } This generates .stabs "local:f(0,1),local,test",36,0,8,_local.3 The ,local,test indicates that local is nested inside test function. But this is not enough as I don't know what happens for instance if parameters are passed by registers... Adding some debug info concerning the location of the parent frame seems like a good idea, no ? The Free Pascal approach to use a pseudo parameter called 'parent_ebp' seems to not be applicable to C as this would be a valid C local variable name. Maybe something beginning with a dollar like for the classes? A similar problem exists for With statements in pascal. Stabs defines even a specific stab number for this but this is also unsupported for now.

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Re: GDB scope does not work quite right for Pascal
by Oldham, Adam 12 Oct '01

12 Oct '01

Yes, I saw some of these threads, but nothing seemed to shed light on fixes for the scoping of this. It is good to know Ada does this as well so that maybe us Ada/Pascal people can get together and come up with a fix. I submitted code that demonstrates this with my bug report as well.... Adam -----Original Message----- From: Andrew Cagney [mailto:ac131313@cygnus.com] Sent: Friday, October 12, 2001 1:40 PM To: Daniel Jacobowitz; Pierre Muller Cc: Maurice Lombardi; adam.oldham(a)marconi.com; gdb(a)sources.redhat.com; core(a)freepascal.org; gpc(a)gnu.de Subject: Re: GDB scope does not work quite right for Pascal > On Fri, Oct 12, 2001 at 06:57:32PM +0200, Maurice Lombardi wrote: > >> > There are several remarks to that bug report: >> > 1) I don't know at all how nested functions work in C >> >Are they allowed? > >> >> >> AKAIK no, they are not allowed, and this is the root of the problem, >> since gdb is written mainly by/for C programmers. > > > They aren't allowed by standard C. GCC does in fact allow them, > although their use isn't recommended. I think GDB's support for them > is somewhat crusty. The thread http://sources.redhat.com/ml/gdb-patches/2001-07/msg00714.html is probably relevant. Following on Joel's strategy (Ada) the first thing needed is probably a testcase so that people know the status of the underlying code Andrew

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Re: compiler bug
by Theo Carr-Brion 12 Oct '01

12 Oct '01

The problem seems to be a general one with variables of Array[AType] of String(Capacity) which we use quite a lot. The capacity of the string if not always set. Sometimes it works and sometimes it does not and I can't find the pattern. Setting the capacity of each string in the program gets round the problem. Theo Carr-Brion

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install-gpc-binary
by HARIKRISHNA Kocheralkota 08 Oct '01

08 Oct '01

Hello, The tarball of gpc binary distribution is containing a file "gpcpp", in the lib/gcc-lib/sparc-sun-solaris2.6/2.95.3/ directory, where as the "install-gpc-binary" script from gpc site is checking for 'gpc-cpp'. we are running the 'install-gpc-binary' file contained in /gcc-2.95.3/gcc/p/script, instead of the same available on gpc site. We are facing no problem. Is it OK ? Thanks and Regards hari

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gpc install problem on cygwin-w98
by Per Persson 07 Oct '01

07 Oct '01

Hello! I have tried to compile gpc-20010924 on a cygwin system (windows-98 Pentium 2). I think I follow the instructions in the Install file thoroughly but the compilation fails. The configuration seems to work without problems (I get promped for the patch for gpc-2.1; I use the gcc-core-2.95.2 source found at the gnu-home-site) After a few seconds of make, however I get: gcc -c -DHAVE_CONFIG_H -g -O2 -I. -I/home/Persson/gnucomplers/gcc-2.95.2/lib iberty/../include /home/Persson/gnucomplers/gcc-2.95.2/libiberty/strerror.c /home/Persson/gnucomplers/gcc-2.95.2/libiberty/strerror.c:461: conflicting t ypes for `sys_errlist' /usr/include/sys/errno.h:23: previous declaration of `sys_errlist' make[1]: *** [strerror.o] Error 1 make[1]: Leaving directory `/home/Persson/gnucomplers/gpc-gcc-build/libibert y' make: *** [all-libiberty] Error 2 I use the 'present' version of cygwin with the following setup.log file: 2001/09/29 16:38:34 Starting cygwin install, version 2.78.2.9 Current Directory: C:\user-pgm\install_files\cygwin source: from cwd Selected local directory: C:\user-pgm\install_files\cygwin root: C:/cygwin binary system Installing...latest/ash/ash-20010827-1.tar.bz2 Installing...latest/autoconf/autoconf-2.52-1.tar.bz2 Installing...latest/automake/automake-1.5-1.tar.bz2 Installing...latest/bash/bash-2.05-8.tar.bz2 Installing...latest/binutils/binutils-20010914-2.tar.bz2 Installing...latest/bison/bison-1.28-1.tar.gz Installing...latest/byacc/byacc.tar.gz Installing...latest/bzip2/bzip2-1.0.1-6.tar.gz Installing...latest/clear/clear-1.0.tar.gz Installing...latest/cpio/cpio-2.4.2.tar.gz Installing...contrib/cron/cron-3.0.1-5.tar.bz2 Installing...latest/crypt/crypt-1.0-1.tar.gz Installing...latest/ctags/ctags-5.0.1-1.tar.gz Installing...contrib/cvs/cvs-1.11.0-1.tar.gz Installing...latest/cygrunsrv/cygrunsrv-0.94-1.tar.bz2 Installing...latest/cygwin/cygwin-1.3.3-2.tar.bz2 Installing...latest/dejagnu/dejagnu-20010117-1.tar.gz Installing...latest/diff/diff.tar.gz Installing...latest/expect/expect-20010117-1.tar.gz Installing...latest/file/file-3.33-1.tar.gz Installing...latest/fileutils/fileutils-4.1-1.tar.bz2 Installing...latest/findutils/findutils.tar.gz Installing...latest/flex/flex-2.5.4-1.tar.gz Installing...latest/gawk/gawk-3.0.4-1.tar.gz Installing...latest/gcc/gcc-2.95.3-5.tar.bz2 Installing...latest/gdb/gdb-20010428-1.tar.gz Installing...contrib/gdbm/gdbm-1.8.0-3.tar.gz Installing...contrib/gettext/gettext-0.10.38-2.tar.bz2 Installing...contrib/ghostscript/ghostscript-6.51-1.tar.bz2 Installing...latest/gperf/gperf.tar.gz Installing...latest/grep/grep-2.4.2-1.tar.gz Installing...latest/groff/groff-1.16.1-1.tar.gz Installing...latest/gzip/gzip-1.3-1.tar.gz Installing...latest/inetutils/inetutils-1.3.2-14.tar.gz Installing...contrib/irc/irc-20010101-1.tar.gz Installing...contrib/jbigkit/jbigkit-1.2-4.tar.bz2 Installing...contrib/jpeg/jpeg-6b-4.tar.gz Installing...latest/less/less-358-3.tar.gz Installing...contrib/libpng/libpng-1.0.11-1.tar.gz Installing...latest/login/login-1.4-2.tar.gz Installing...contrib/lynx/lynx-2.8.4-1.tar.bz2 Installing...latest/m4/m4.tar.gz Installing...latest/make/make-3.79.1-4.tar.bz2 Installing...latest/man/man-1.5g-2.tar.gz Installing...latest/mingw/mingw-20010917-1.tar.gz Installing...latest/mingw-runtime/mingw-runtime-1.1-1.tar.bz2 Installing...latest/mt/mt-1.9.2-1.tar.bz2 Installing...contrib/mutt/mutt-1.2.5i-4.tar.bz2 Installing...contrib/ncftp/ncftp-3.0.2-2.tar.gz Installing...latest/ncurses/ncurses-5.2-5.tar.gz Installing...latest/cygwin/newlib-man-20001118.tar.gz Installing...latest/opengl/opengl-1.1.0-5.tar.gz Installing...latest/openssh/openssh-2.9p2-3.tar.bz2 Installing...latest/openssl/openssl-0.9.6b-1.tar.bz2 Installing...latest/patch/patch-2.5-2.tar.gz Installing...latest/pcre/pcre-3.4-2.tar.gz Installing...contrib/perl/perl-5.6.1-2.tar.bz2 Installing...contrib/popt/popt-1.6.1-1.tar.gz Installing...contrib/postgresql/postgresql-7.1.3-1.tar.bz2 Installing...contrib/python/python-2.1.1-2.tar.bz2 Installing...contrib/readline/readline-4.2-3.tar.bz2 Installing...latest/regex/regex-4.4.tar.gz Installing...contrib/rsync/rsync-2.4.6-2.tar.bz2 Installing...contrib/rxvt/rxvt-2.7.2-6.tar.gz Installing...latest/sed/sed-3.02-1.tar.gz Installing...latest/sh-utils/sh-utils-2.0-2.tar.gz Installing...contrib/squid/squid-2.4-STABLE20010508.tar.gz Installing...contrib/ssmtp/ssmtp-2.38.7-2.tar.gz Installing...latest/tar/tar-1.13.19-1.tar.gz Installing...latest/tcltk/tcltk-20001125-1.tar.gz Installing...contrib/tcsh/tcsh-6.10.00-3.tar.gz Installing...latest/termcap/termcap-20010825-1.tar.bz2 Installing...contrib/tetex/tetex-beta-20001218-1.tar.gz Installing...latest/texinfo/texinfo-4.0-4.tar.gz Installing...latest/textutils/textutils-2.0-2.tar.bz2 Installing...contrib/tiff/tiff-3.5.6beta-2.tar.gz Installing...latest/time/time.tar.gz Installing...contrib/unzip/unzip-5.41-1.tar.gz Installing...latest/vim/vim-6.0-1.tar.bz2 Installing...latest/w32api/w32api-1.1-1.tar.bz2 Installing...contrib/wget/wget-1.6-1.tar.gz Installing...latest/which/which-1.4.tar.gz Installing...contrib/xpm-nox/xpm-nox-4.1.0-1.tar.bz2 Installing...contrib/zip/zip-2.3-1.tar.gz Installing...latest/zlib/zlib-1.1.3-6.tar.gz mbox note: Installation Complete 2001/09/29 16:51:41 Ending cygwin install What is wrong? Should I use another setup for Cygwin? Can my djgpp-installation cause problem (I have removed the 'djgpp-path' part of my autoexec.bat file temporarily) Per _________________________________________________________________ HÃ¤mta MSN Explorer kostnadsfritt pÃ¥ http://explorer.msn.se

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gpc-20010924 and make install bug
by Russell Whitaker 06 Oct '01

06 Oct '01

Hi built gpc same way as always ( no CVS ) and gpc -v gives Reading specs from /usr/local/lib/gcc-lib/@target_alias@/2.95.3/specs gpc version 20010924, based on 2.95.3 20010315 (release) As is, test fails miserably. quick kludge: found cp -r \@target_alias\@/* i586-pc-linux-gnu works. the i5 etc directory is where everything should have been. then test results are: tests 1763 pass 1762 skip 1 fail 0 russ

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(no subject)
by Alan Sun 05 Oct '01

05 Oct '01

Dear sir: I've got a problem when I was installing gpc. The instruction told me to run the following command: configure --enable-languages=pascal, but I cannot find an executable file such as configure.exe, and I have read the help entirely but I still don't know where I can get it. Please help me! Thanks. yours, Alan Sun

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Gpc October 2001