something fishy with Git commit and log from file

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The following command fails on my repository:

   $ git commit --file=clog
   fatal: could not read log file 'clog': No such file or directory

   $ cat clog
   toto

Using the following command the commit pass without problem:

   $ cat clog | git commit --file=-

With GDB I get:

$ gdb --args git ci --file=clog
This GDB was configured as "i686-pc-cygwin"...
(gdb) break strbuf_read_file
Breakpoint 1 at 0x44e64a: file strbuf.c, line 301.
(gdb) run
Starting program: /usr/local/bin/git.exe ci --file=clog

Breakpoint 1, strbuf_read_file (sb=0x22cac0, path=0x22ccfa "clog", hint=0) at strbuf.c:301
301             fd = open(path, O_RDONLY);
(gdb) print path
$1 = 0x0

???? outch, this is strange, or a gdb artifact?

(gdb) n
302             if (fd < 0)
(gdb) print fd
$2 = -1
(gdb) print *0x22ccfa
$3 = 1735355491
(gdb) print (char)*0x22ccfa
$4 = 99 'c'
(gdb) print (char)*0x22ccfb
$5 = 108 'l'
(gdb) print (char)*0x22ccfc
$6 = 111 'o'
(gdb) print (char)*0x22ccfd
$7 = 103 'g'
(gdb) print (char)*0x22ccfe
$8 = 0 '\0'

But looks like path really contains 'clog'!!!

No luck for now to find the problem. Note that the same command pass fine on other repositories. At this point this looks really like some kind of memory corruption...

I'm on Windows, using Git for Cygwin and the compiler is:

$ gcc --version
gcc (GCC) 3.4.4 (cygming special, gdc 0.12, using dmd 0.125)

Pascal.

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--|------------------------------------------------------
--| Pascal Obry                           Team-Ada Member
--| 45, rue Gabriel Peri - 78114 Magny Les Hameaux FRANCE
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--|              http://www.obry.net
--| "The best way to travel is by means of imagination"
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