Re: [libmicrohttpd] Problems building (configuring) under Cygwin

[Jordan Henderson]

Why would it be a good idea to maintain the -no-undefined flag anywhere in the build process seeing as GCC no longer supports it and always returns an error?

On Sun, Jan 26, 2014 at 8:49 AM, Jordan Henderson <address@hidden> wrote:

I'd already removed -no-undefined from configure.ac there, ran autoconf and built.

On Sun, Jan 26, 2014 at 2:29 AM, LRN <address@hidden> wrote:

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On 26.01.2014 5:24, Jordan Henderson wrote:
> On Sat, Jan 25, 2014 at 7:27 PM, LRN <address@hidden> wrote:

>> On 26.01.2014 0:55, Jordan Henderson wrote:
>>> On Thu, Jan 23, 2014 at 1:59 AM, LRN wrote:
>>>> On 23.01.2014 6:45, Jordan Henderson wrote:
>>>>> Hi,
>>>>>
>>>>> Attempting to configure libmicrohttpd-0.9.33 under the
>>>>> latest Cygwin (CYGWIN_NT-6.1 Jordan-THINK
>>>>> 1.7.27(0.271/5/3) 2013-12-09 11:54 x86_64 Cygwin) I'm
>>>>> getting the error described here:
>>>>>
>>>>> http://lists.gnu.org/archive/html/libmicrohttpd/2010-08/
>>>>> msg00013.html
>>>>>
>>>>>
>>>>>
>>>>> Configure stops telling me that my system doesn't support
>>>>> pthreads.
>>>>>
>>>>> I saw a later patch that appears to have backed out some
>>>>> of the changes recommended above (described here):
>>>>>
>>>>> http://lists.gnu.org/archive/html/libmicrohttpd/2011-03/
>>>>> msg00023.html
>>>>>
>>>>>
>>>>>
>>>>> I attempted to restore the changes recommended here to the
>>>>> new baseline, but I'm still getting the error.
>>>>>
>>>>> I understand that the error about not supporting pthreads
>>>>> is a false negative and indicates something else.  Before I
>>>>> try to dig in and rediscover what others may be doing here,
>>>>> I thought I'd ask if there is anyone using libmicrohttpd
>>>>> under Cygwin offer any help?
>>>>
>>>> You shouldn't need plibc on Cygwin, the change from 2011
>>>> sounds like the right thing.
>>>>
>>>> I've just built a MSYS2 version of libmicrohttpd, it
>>>> detected pthreads at configure time correctly. MSYS2 (and
>>>> Cygwin) provides pthreads as part of the main runtime, so
>>>> it's impossible to miss.
>>>>
>>>> That said, i don't use x86_64 versions of either MSYS2 or
>>>> MinGW, so maybe there's some weirdness on that front that
>>>> escaped my notice.
>>>>
>>>>
>>> I was able to build under cygwin by removing the use of
>>> -no-undefined from the cygwin rule in configure.ac.
>>
>>> Seems like there was a change in gcc that made this an error.
>>
>>> http://cygwin.com/ml/cygwin/2013-07/msg00414.html
>>
>>> There's discussion in that thread about the correct way to fix
>>> this and I wasn't quite clear if my approach was right, so I
>>> didn't include a patch. LRN, who was in on this discussion
>>> might have some perspective.
>>
>>
>> Please show the contents of config.log (the place where it says
>> that "C compiler cannot create executables"; specifically, i want
>> to see the command that configure invoked to compile and link the
>> executable, and the error messages it produced).
>>

> The string "C compiler cannot create executables" (or similar) does
>  not appear in my config.log.
>
> Here's what I believe is the relevant error:
>
> ---8<--- | /* end confdefs.h. */ | |         #include <pthread.h>
> | | int | main () | { | |         pthread_create(0,0,0,0); | |   ;
> |   return 0; | } configure:12923: checking for pthread_create in
> -lpthread configure:12948: gcc -o conftest.exe -fno-strict-aliasing
> -g -O2 -no-undefined conftest.c -lpthread   >&5 gcc: error:
> unrecognized command line option '-no-undefined' configure:12948:
> $? = 1 configure: failed program was: ---8<---
>
> I've attached a copy of my config.log with some PATH entries
> unrelated to cygwin or development deleted.

Try removing -no-undefined from LDFLAGS="$LDFLAGS" (around line 169 in
configure.ac). MHD configure adds unconditional -no-undefined later
on, after it does all tests that require linking, so this
cygwin-special -no-undefined is no longer necessary.

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--
----Jordan Henderson

"I can picture in my mind a world without war, a world without hate. And I can picture us attacking that world, because they'd never expect it."
  - Jack Handey

--
----Jordan Henderson

"I can picture in my mind a world without war, a world without hate. And I can picture us attacking that world, because they'd never expect it."
  - Jack Handey