Hi,
I am not sure that I can help, but this is an interesting topic and I am curious if you find a solution.
I can only assume that maybe you did not link to gcc and c libraries. Inside Common.pas, you should try to add {$link c} and {$link gcc}. You may check also that the symbol of your function looks as you assume it is. Use the command ’nm’ on Cygwin. On DOS you can also use vcvarsall.bat or dumpbin.exe.
Ciao,
Gilles Marcou
Show quoted text 117 lines
Le 24 janv. 2019 à 12:00, a écrit :
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Today's Topics:
1. trying to use C code in .pas on WIN32 (conlin664)
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Message: 1
Date: Wed, 23 Jan 2019 14:30:38 -0700 (MST)
From: conlin664
To:
Subject: [fpc-pascal] trying to use C code in .pas on WIN32
Message-ID:
Content-Type: text/plain; charset=us-ascii
I've done research, but am just missing something.
my .pas code links just fine, but doesn't RUN.
( first writeln never appears )
If I remove the external call to C code, then the writeln works as normal.
Problem:
I have c code, which I'm compiling on a WIN32 machine ( yes the horror )
using GCC 4.5.2 target mingw32
It generates .o files which i grouped together with ar into common.a
I then renamed common.a to be libcommon.a
Then I have a
Common.pas file:
unit Common;
interface
uses
sysutils, dos, CTypes;
{$linklib libcommon.a }
procedure CutilInit; cdecl; external 'CutilInit';
implementation
end.
the a CommonTest.pp file:
Program commonTest;
uses
Common;
begin
writeln('got here');
CutilInit();
end.
fpc.exe -TWin32 -Mdelphi -vw -Sg -Ci -O1 -Cp386 -XS -gl -p- -b-
is the relevant way I'm invoking fpc
It links, but then does nothing on execution.
If I change the C line to be:
procedure CutilInit; cdecl; external;
I think get a link error
Undefined Symbol: _CutilInit
Any ideas ?
Does the linklib define need to be below where I declare the C routines ?
Is it something to do with WINDOWS.. ( aka the _ in the name )
Maybe I need different options on the C compile..
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