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Date: Mon, 20 Sep 2010 22:38:48 -0400
From: Charles Wilson <cygwin AT cwilson DOT fastmail DOT fm>
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To: cygwin AT cygwin DOT com
Subject: Re: missing pthread.h in building 64-bit aaplications
References: <29764972 DOT post AT talk DOT nabble DOT com> <20100921021846 DOT GB13592 AT ednor DOT casa DOT cgf DOT cx>
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On 9/20/2010 10:18 PM, Christopher Faylor wrote:
> On Mon, Sep 20, 2010 at 05:01:52PM -0700, kenny AT ca wrote:
>> I used "x86_64-w64-mingw32-gcc ...." to build the application, but failed.
>> The output tells missing pthread.h. pthread.h is included in one of my
>> source files.
>>
>> I located the file, one in C:\cygwin\usr\include, the other
>> C:\cygwin\usr\x86_64-w64-mingw32\sys-root\mingw\include.
>>
>> I tried using -I to tell gcc to include pthread.h, but failed. why? 
> 
> This is a MinGW compiler.  It doesn't support pthread.  Any threading
> support would be with standard Windows calls.

I don't think that's accurate.  The x86_64-mingw64 cross compiler
package set includes a win32-pthreads package, including pthread.h.
It's necessary for gcc's OMP support via libgomp.

That's why the OP was able to find one copy of pthread.h in
C:\cygwin\usr\x86_64-w64-mingw32\sys-root\mingw\include.  The real
question is why the (cross)compiler couldn't locate it; given the whole
/mingw prefix and sysroot support, it really should be able to.

--
Chuck

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