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Re: [PATCH] ltdl: set libltdl_cv_need_uscore to yes on OS/2

From: Gary V. Vaughan
Subject: Re: [PATCH] ltdl: set libltdl_cv_need_uscore to yes on OS/2
Date: Thu, 27 Nov 2014 03:21:10 +0000


> On 27 Nov 2014, at 02:47, KO Myung-Hun <address@hidden> wrote:
> Hi/2.
> Gary V. Vaughan wrote:
>> Hi,
>> Thanks for the report and the patch!
>>> On Nov 22, 2014, at 4:08 AM, KO Myung-Hun <address@hidden> wrote:
>>> On OS/2, dlopen() does not support a program. So libltdl_cv_need_uscore
>>> is set to unknown, but dlsym() requires an underscore prefix. So set
>>> libltdl_cv_need_uscore to yes on OS/2 if lt_cv_sys_symbol_underscore is
>>> yes and libltdl_cv_need_uscore is unknown.
>> Actually, I think the real problem here is that LT_FUNC_DLSYM_USCORE is
>> making the bad assumption that dlsym() only requires a leading symbol
>> name underscore on machines where self dlopening works.
>> Better than your suggested patch, we should really be checking whether
>> dlsym of ordinary loadable module symbol names requires a leading underscore.
> I agree.
>> I pushed the core of a new macro that does exactly that to M4 master just
>> now.
>> Would you let me know whether this works correctly on OS2 for you please?
> Of course. Unfortunately, however, it does not work. dlopen() in
> configure fails due to 'file not found'.

Thanks for checking.  Can you tell me why it fails (module is not compiled 
path argument to dlopen() is wrong), and maybe suggest what would fix it, 

Gary V. Vaughan (gary AT gnu DOT org)

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