Using Mkmf to Verify Libraries

Ruby
1

Hi,

I’m trying to use the ‘mkmf’ library to determine if a given library is
installed.

I have two identical machines.

On machine 1:
find_library(‘mysqlclient’, ‘mysql_query’, ‘/path/to/lib’) => true

On machine 2:
find_library(‘mysqlclient’, ‘mysql_query’, ‘/path/to/lib’) => false

I’m stumped. Does anyone have any idea what could be causing this?

libmysqlclient.a is installed in the exact same location on both
machines.

Regards,
Steven

2

Steven H. wrote:

On machine 2:
find_library(‘mysqlclient’, ‘mysql_query’, ‘/path/to/lib’) => false

I’m stumped. Does anyone have any idea what could be causing this?

libmysqlclient.a is installed in the exact same location on both machines.

The last time I hit a similar situation it turned out I didn’t have read
permissions on the library I was looking for. That may be it.

Regards,

Dan

3

2006/12/6, [email protected] [email protected]:

I have two identical machines.

Careful, ‘identical’ means the md5sum of all disks match

Same md5 doesn’t mean identical.

4

[email protected] wrote:

machines.
Cheers,

Vince

Daniel and Vince, thanks for the leads. :slight_smile:

Regards,
Steven

5

I have two identical machines.

Careful, ‘identical’ means the md5sum of all disks match and the hardware is the same. That’s hard ;-)…

> On machine 1:
> find_library(‘mysqlclient’, ‘mysql_query’, ‘/path/to/lib’) => true
> On machine 2:
> find_library(‘mysqlclient’, ‘mysql_query’, ‘/path/to/lib’) => false
> libmysqlclient.a is installed in the exact same location on both
> machines.

There are several things that could be causing this. First, are you sure that the rbconfig.rb files are the same in both machines ? There are several path stored in this file. Moreover, mkmf is aware of some environment variables. Check first that
set
and
ruby -r rbconfig -e ‘p Config::CONFIG’
gives you the same things. If not, it should be easy to track the problem.

Cheers,

Vince