Unable to find main lpr file when compiling
lazarus / 9-Editor

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InRong · 2015-08-12 12:03

Hi, when I compile, I am now getting the error in messages "Error:
undefined reference to `mysql_port`" which is easily understood if it
cannot load the mysql.inc....

However, if I click on the line in the IDE, then I can find the
declaration, then it opens the mysql.inc file.

Worse, if I click on the line in Messages, I get the following:

QuoteUnable to find file "rcl_logana4.lpr".
If it belongs to your project, check search path in
Project -> Compiler Options -> Search Paths -> Other Unit Files. If
this file belongs to a package, check the appropriate package compiler
options. If this file belongs to Lazarus, make sure compiling clean.
If the file belongs to FPC then check fpc.cfg. If unsure, check
Project -> CompilerOptions -> Test

Where rcl_logana4.lpr is unsurprisingly my one and only source file...

I have just upgraded from CentOS6.5 to CentOS 7.1 on this machine, and
it was OK before that, so suspect something might be missing or just
different.

FPC: 2.6.4-1
FPC-Src: 2.6.4-140420
Lazarus: 1.4.2-0

These are all on basic 64bit Intel based. It is in a VirtualBox as
well, but not sure how that might change stuff

TIA

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InRong · 2015-08-12 13:10

To add some minor detail, the Error in Messages is correct, but the
error when I click on it is still confusing

I seem to have managed to change to LinkDynamically, not a bad thing,
but that symbol is only defined if not doing so....

It doesn't however explain the strange message when clicking on the
error, but does mean it works when there are no errors.... I was only
displaying the value anyway, so it was not needed.

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jc99 · 2015-08-13 06:51

When I am on Linux, i have those strange messages when the case of the
filename and the name of the Program, unit, library ... don't match.
Could you check that ?
Maybe showing/uploading the project would be a good thing. Because
it's hard to tell without source. (Or some lines of source)

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InRong · 2015-08-13 13:06

Hi, everything seems to be lowercase, so doesn't seem to be the issue
this time. This is an old project that was initially created in 0.9 or
maybe earlier. I recently need to add to it, so I updated to 1.4.2 on
Centos6.5, and it compiles OK, so I did not see if this issue occurred
at this point. I then updated to Centos7, which was a bit of a task,
but have it working now (I think....).

There are 2000 lines, all in one file rcl_logana4.lpr, so I will post
just a snippet. My workaround is just not to have any coding
errors..... Easier said than done lol..

I think this is an IDE/base OS issue, quite possibly an issue in
setup, or even something like just suggested with case sensitivity. I
have just looked, and it does find the file and show the correct line
of code for the hints (all just unused parameters in callbacks), it is
just this error. Even stranger, I removed a comma earlier in the file,
and this gives a sensible error, which also shows up correctly in the
code... Therefore, it is related to the use of that variable
somehow... I am assuming there are no major flaws in the mysql55 code
as I would expect it to be well enough used by now. Well, I will stop
rambling for a moment..

Code: [Select]program rcl_logana4;

{$mode objfpc}{$H+}

uses {$IFDEF UNIX} {$IFDEF UseCThreads}
  cthreads, {$ENDIF} {$ENDIF}
  contnrs,
  SysUtils,
  CustApp,
  { you can add units after this }
  BaseUnix,
  Math,
  mysql55, Classes, lNet;

const                   //default values

[snip]
  // The errored parts are totally irrelevant, so I just remove them
to workaround the initial error.
      writeln('Mysql_port      : ', mysql_port);
      //writeln('Mysql_unix_port : ', mysql_unix_port);

[snip]


var
  Application: tRCL_main;

{$R *.res}

begin
  Application := tRCL_main.Create(nil);
  Application.OnException := @Application.CustomExceptionHandler;
  Application.FileVersion:='0.1.0.15';
  Application.Run;
  Application.Free;
end.

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tk · 2015-08-13 14:07

Check search paths for the project.
They should not contain any package paths, rather the packages should
be in project require clause.
If your project only resides in one directory the search paths in
Project options should be empty.

I had such errors with old projects as well, because this some old
Lazarus versions needed some search paths, I don't remember exactly
anymore.

Btw. I think the project should have the Interfaces unit in the uses
clause (on second place because you use cthreads). But the IDE should
complain about it as well.

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InRong · 2015-08-13 14:27

There was an old package in there, so I have moved lNet from a
directory into the IDE, but nothing.

Interfaces I think is less needed as this is old enough to be a
command line tool.... This is also why I need to add the mysql library
into the library path, as I don't think I am using the IDE mysql
access (well not fully anyway)

I have done some more checking, and note this is a linker related
issue. If I change it from the mysql variables to xxxxxx then I get a
compiler error, and all is OK, but this is what I get for the mysql
error, with it complaining about all mysql variables, whereas with
xxxxxx it stops on the first error.

Code: [Select]Compile Project, Target: rcl_logana4: Exit code 1,
Errors: 3, Hints: 7
rcl_logana4.lpr(181,39) Hint: Parameter "SigInf" not used
rcl_logana4.lpr(181,56) Hint: Parameter "sigCtx" not used
rcl_logana4.lpr(172,21) Hint: Parameter "aSocket" not used
rcl_logana4.lpr(159,30) Hint: Parameter "f" not used
rcl_logana4.lpr(144,39) Hint: Parameter "aSocket" not used
rcl_logana4.lpr(150,22) Hint: Parameter "aSocket" not used
rcl_logana4.lpr(114,30) Hint: Parameter "f" not used
/home/alan/pascal/svn_rcl/lib/x86_64-
linux/libprcl_logana4.a(rcl_logana40s19.o): In function
`TRCL_LOGGER__DB_CONNECT':
rcl_logana4.lpr(508,1) Error: undefined reference to `mysql_port'
rcl_logana4.lpr(509,1) Error: undefined reference to `mysql_unix_port'
Error: Error while linking

The related section from mysql.inc is:
Code: [Select]{$IFNDEF LinkDynamically}
      var
         mysql_port : cuint;cvar;external;
         mysql_unix_port : Pchar;cvar;external;
{$ENDIF}

Is this an issue with the IDE, or just with how I am using it?

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tk · 2015-08-13 14:59

Never thought a variable could have an external declaration.
Have been using only statically linked functions so far..
Anyway maybe the linker does not support this anymore, so the dynamic
linking would help (mean the LinkDynamically directive).
So you could examine the problem at runtime.