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From:	Erik Bray <erik DOT m DOT bray AT gmail DOT com>
Date:	Thu, 24 Nov 2016 11:47:21 +0100
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Subject:	Re: python 2.7.12 pip install with extensions fails with warning: "__BSD_VISIBLE" redefined
To:	cygwin AT cygwin DOT com
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On Wed, Nov 23, 2016 at 4:24 AM, Jason Bell <jbell9999 AT gmail DOT com> wrote:
> Hi -
>
> The newest version of cygwin with python 2.7.12-1 fails when pip
> installing packages that require compilation.  For example, pycrypto
> fails:
>
> $ pip install pycrypto
> Collecting pycrypto
> .......
>   building 'Crypto.PublicKey._fastmath' extension
>   creating build/temp.cygwin-2.6.0-x86_64-2.7
>   creating build/temp.cygwin-2.6.0-x86_64-2.7/src
>   gcc -fno-strict-aliasing -ggdb -pipe -Wimplicit-function-declaration
> -fdebug-prefix-map=/usr/src/ports/python/python-2.7.12-1.x86_64/build=/usr/src/debug/python-2.7.12-1
> -fdebug-prefix-map=/usr/src/ports/python/python-2.7.12-1.x86_64/src/Python-2.7.12=/usr/src/debug/python-2.7.12-1
> -fwrapv -Wall -Wstrict-prototypes -std=c99 -O3 -fomit-frame-pointer
> -Isrc/ -I/usr/include/ -I/usr/include/python2.7 -c src/_fastmath.c -o
> build/temp.cygwin-2.6.0-x86_64-2.7/src/_fastmath.o
>   In file included from /usr/include/python2.7/Python.h:8:0,
>                    from src/_fastmath.c:31:
>   /usr/include/python2.7/pyconfig.h:1221:0: warning: "__BSD_VISIBLE" redefined
>    #define __BSD_VISIBLE 1
>    ^
>   In file included from /usr/include/sys/config.h:5:0,
>                    from /usr/include/_ansi.h:16,
>                    from /usr/include/stdio.h:29,
>                    from src/_fastmath.c:29:
>   /usr/include/sys/features.h:250:0: note: this is the location of the
> previous definition
>    #define __BSD_VISIBLE  0
>    ^
>   In file included from /usr/include/python2.7/pyport.h:332:0,
>                    from /usr/include/python2.7/Python.h:58,
>                    from src/_fastmath.c:31:
>   /usr/include/sys/time.h:104:34: error: unknown type name ‘u_int’
>    bintime_mul(struct bintime *_bt, u_int _x)
>                                     ^
>   error: command 'gcc' failed with exit status 1
>
>   ----------------------------------------
>
> I can fix these errors by changing __BSD_VISIBLE from 1 to 0 in
> /usr/include/python2.7/pyconfig.h.  Here's a patch:
>
> --- pyconfig.h 2016-11-20 09:38:22.434174700 -0500
> +++ pyconfig-bsd-not-visible.h 2016-11-20 09:38:05.391993200 -0500
> @@ -1218,7 +1218,7 @@
>  #define _XOPEN_SOURCE_EXTENDED 1
>
>  /* Define on FreeBSD to activate all library features */
> -#define __BSD_VISIBLE 1
> +#define __BSD_VISIBLE 0
>
>  /* Define to 1 if type `char' is unsigned and you are not using gcc.  */
>  #ifndef __CHAR_UNSIGNED__
>
> And here's a link to a script that changes the value in one shot:
> https://gist.githubusercontent.com/thorrr/271058eeb5f1903213938f89fcbc3a73/raw/15026396047b61102826a8dd92ea591155573f1d/pyconfig-fix.sh
>
> I can confirm this makes several packages I use often work correctly
> but I don't know what the other consequences of changing this variable
> are.

FWIW this patch to pycrypto also fixes it:

https://git.sagemath.org/sage.git/tree/build/pkgs/pycrypto/patches/cygwin/disable-std-c99.patch?id=aaa9b7fc887b64ba1dba7cba16061f598a097b75

The problem only occurs when trying to build with the C99 standard if
Python itself was not.

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