[Caml-list] mingw dll hell

["HENRIKSON, JEFFREY" <JEFHEN@SAFECO.com>]

This refers to my earlier post about dll trouble.  I am having
inconsistent dll linking behavior, though things are getting better as I
futz with more flags.  Again, three weeks ago all this same code and
build scripts worked perfectly.  One thing I seem to be noticing is that
there are fewer errors if I do not link to libraries that depend on
cygwin1.dll.

Here is one case I do not understand.  Under some builds I can ocamlrun
an exe with success, but running the exe by itself crashes.  (An
exception is probably being thrown, but I can't see it.)  Running under
GDB runs successfully.  How can this be?


Jeff Henrikson


--------------------------------

ocaml: 3.07pl2 mingw
pcre: 4.4
pcre-ocaml: 5.04.3
gcc: 3.3.1
windows: 2000

jefhen@HOXPCXJEFHEN ~/src/pcre-ocaml-5.04.3/lib
$ test

jefhen@HOXPCXJEFHEN ~/src/pcre-ocaml-5.04.3/lib
$ ocamlrun test.exe
hello
this12.3 is 2.78a t3st.
12 3 2 78 3
jefhen@HOXPCXJEFHEN ~/src/pcre-ocaml-5.04.3/lib
$ test.exe

jefhen@HOXPCXJEFHEN ~/src/pcre-ocaml-5.04.3/lib
$ gdb test.exe
GNU gdb 2003-09-20-cvs (cygwin-special)
Copyright 2003 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you
are
welcome to change it and/or distribute copies of it under certain
conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for
details.
This GDB was configured as "i686-pc-cygwin"...(no debugging symbols
found)...
(gdb) run
Starting program: /cygdrive/c/src/pcre-ocaml-5.04.3/lib/test.exe
hello
this12.3 is 2.78a t3st.
12 3 2 78 3
Program exited normally.
(gdb) quit

jefhen@HOXPCXJEFHEN ~/src/pcre-ocaml-5.04.3/lib
$


test.ml:

output_string stdout "hello\n"; flush stdout;

open Printf;;
open Pcre;;

let s = "this12.3 is 2.78a t3st.";;

let r = regexp "([0-9]+)";;

let a = extract_all ~full_match:false ~rex:r s;;

printf "%s\n" s;;

Array.iter (fun e -> printf "%s " e.(0)) a;;

flush stdout;

0;;


build commands:


ocamlc -c pcre.mli -o pcre.cmi
ocamlc -c pcre.ml -o pcre.cmo
gcc -mno-cygwin -D__MINGW32__ -I c:\ocaml\lib -I/usr/include -I
/usr/include/w32api -c pcre_stubs.c
gcc -mno-cygwin -shared -L `ocamlc -where` -o dllpcre_stubs.dll
-Wl,--out-implib,libpcre_stubs.a pcre_stubs.o -L . -lpcre-mingw `ocamlc
-where`/ocamlrun.a
Creating library file: libpcre_stubs.a
Info: resolving _local_roots by linking to __imp__local_roots
(auto-import)
chmod 777 dllpcre_stubs.dll
ocamlc -a -o pcre.cma pcre.cmo -dllib -lpcre_stubs


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