Why doesn't Win32::ODBC find the ODBC.dll under Perl 5.10 and Cygwin?
Question
I'm trying to use Perl ODBC to connect to a Microsoft SQL server. My problem is that Perl 5.10.0 is having a problem using the Win32 ODBC driver.
If I run a Perl shell and execute this one line, I get errors.
use Win32::ODBC;
Can't load '/usr/lib/perl5/vendor_perl/5.10/i686-cygwin/auto/Win32/ODBC/ODBC.dll'
for module Win32::ODBC: No such file or directory at
/usr/lib/perl5/5.10/i686-cygwin/DynaLoader.pm line 201.
I've verified that the dll file does exist.
I've installed the Cygwin packages:
- perl (5.10.0-5)
- perl-libwin32 (0.28-2)
Solution
This appears to be a known issue. Grab the libiodbc source, apply the following patch, build, and install:
diff -ub libiodbc-3.52.6/include/iodbcunix.h.orig
--- libiodbc-3.52.6/include/iodbcunix.h.orig 2006-01-26 09:50:59.000000000 +0000
+++ libiodbc-3.52.6/include/iodbcunix.h 2007-12-24 19:33:57.859375000 +0000
@@ -124,6 +124,7 @@
#if defined (OBSOLETE_WINDOWS_TYPES)
typedef unsigned char BYTE;
#endif
+#ifndef WIN32
typedef unsigned short WORD;
typedef unsigned int DWORD;
typedef char * LPSTR;
@@ -131,6 +132,7 @@
typedef wchar_t * LPWSTR;
typedef const wchar_t * LPCWSTR;
typedef DWORD * LPDWORD;
+#endif
#if !defined(BOOL) && !defined(_OBJC_OBJC_H_)
typedef int BOOL;
UPDATE: the Cygwin folks have a TODO for this issue, but it's several months old now. In case that's too long to wait, you can fake it in the meantime:
#! /bin/bash
# run from the libiodbc build directory
gcc -shared -o cygiodbc-2.dll \
-Wl,--out-implib=libcygiodbc-2.dll.a \
-Wl,--export-all-symbols \
-Wl,--enable-auto-import \
-Wl,--whole-archive iodbc/.libs/libiodbc.a \
-Wl,--no-whole-archive
gcc -shared -o cygiodbcinst-2.dll \
-Wl,--out-implib=libcygiodbcinst-2.dll.a \
-Wl,--export-all-symbols \
-Wl,--enable-auto-import \
-Wl,--whole-archive iodbcinst/.libs/libiodbcinst.a \
-Wl,--no-whole-archive
cp cygiodbc{,inst}-2.dll /bin
OTHER TIPS
I've verified that the dll file does exist.
Do you mean that /usr/lib/perl5/vendor_perl/5.10/i686-cygwin/auto/Win32/ODBC/ODBC.dll
exists? If so, do you have read and execute permission?
There's a comment just above /usr/lib/perl5/5.10/i686-cygwin/DynaLoader.pm line 201:
# Many dynamic extension loading problems will appear to come from
# this section of code: XYZ failed at line 123 of DynaLoader.pm.
# Often these errors are actually occurring in the initialisation
# C code of the extension XS file. Perl reports the error as being
# in this perl code simply because this was the last perl code
# it executed.
So it seems something is wrong with your installation. You could try reinstalling Win32::ODBC with:
$ cpan Win32::ODBC