[fpc-devel]Issues with GDB on Mac OS X with mixed case file names

Dr. Rolf Jansen InstantWare at t-online.de
Thu Aug 26 14:53:05 CEST 2004

The following smal pascal program is stored in file named 
TestProgram.pas in the current working directory.

program TestProgamm;
       i : Integer;

    for i := 1 to 5 do

It compiles successfully with:

   fpc -g TestProgram.pas

An object file named TestProgram.o and an executable named TestProgram 
is produced in the cwd.

Invoking GDB with

   gdb TestProgram


GNU gdb 5.3-20030128 (Apple version gdb-330.1) (Fri Jul 16 21:42:28 GMT 
2004) ...BLAH...BLAH...

That is fine so far. But here is the issue:

     (gdb) break TestProgram.pas:6

gives the error message:

     No source file named TestProgram.pas.


     (gdb) break testprogram.pas:6

gives the success confirmation:

     Breakpoint 1 at 0x1fc08: file testprogram.pas, line 6.

(gdb) run
Starting program: 
Reading symbols for shared libraries . done

Breakpoint 1, P$TESTPROGAMM_main () at testprogram.pas:6
6          for i := 1 to 5 do

This is not a really big issue when using GDB from the command line. I 
simply have to remember to input the filenames in lower case letters 
for setting breakpoints.

However, setting breakpoints that do work by the way of Xcodes GUI is 
not possible, because Xcode insists on using the original mixed case 
file name. I searched for hours to no avail to tell either Xcode to use 
lower case letters or to say GDB to ignore the case ("set 
case-sensitive off" in GDB does NOT do the trick).

The lowercase filename comes into the .stabs of the TestProgram due to 
the routine TGNUAssembler.WriteFileLineInfo of aggas.pas at line 237 of 
the fpc compiler. If I change that line from:

    AsmWriteLn(#9'.stabs "'+lower(FixFileName(infile.name^))+'",'+


    AsmWriteLn(#9'.stabs "'+FixFileName(infile.name^)+'",'+

and compile fpc first and then again my TestProgram, then GDB happily 
accepts the mixed case file name for seting breakpoints, and all the 
features of Xcode can be used to source level debug fpc programs.

So, PLEASE, PLEASE, PLEASE, can someone change line 237 in aggas.pas as 
indicated. It would be OK, to make the change conditional for the 
target Darwin.

Just for my curiosity, how does this work with case sensitive 
filesystems. My understanding of what´s going on tells me that setting 
breakpoints in mixed case files e.g. in Linux does´t work even when 
using lower case letters for the breakpoint, as long as line 237 of 
aggas.pas is not changed.

Best regards


__ InstantWare ______________________________________________________
  Dr. Rolf Jansen * Stephanienstraße 19 * D-76133 Karlsruhe * Germany


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