lang/ruby2* build failure on arm

[Dimitry Andric]

On 20 Nov 2015, at 23:02, Michael Moll <mmoll at FreeBSD.org> wrote:
> 
> On Fri, Nov 20, 2015 at 06:04:53PM +0100, Dimitry Andric wrote:
>>> In r384323 (ports) swills@ fixed the build of the lang/ruby2* ports,
>>> however, on a recent CURRENT on armv6hf I'm getting:
>>> checking for setjmp type... configure: error: _setjmp is not available
>> 
>> Check the config.log file for further details.  Why does the configure
>> script conclude that _setjmp is not available?
> 
> The whole file is available as http://space.kvedulv.de/ruby_arm_config.log, the output
> from the specific test is:
> 
> conftest.c:340:20: error: __builtin_longjmp is not supported for the current target
>            void t(void) {__builtin_longjmp((void **) jb, 1);}
>                          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> conftest.c:341:29: error: __builtin_setjmp is not supported for the current target
>            int jump(void) {(void)(__builtin_setjmp((void **) jb) ? 1 : 0); return 0;}
>                                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Right, but that is not the real problem.  Earlier on, the configure
script is checking for the regular _setjmp():

configure:16921: checking for _setjmp
configure:16921: cc -o conftest -O -pipe  -fno-strict-aliasing -I/usr/local/include   -fstack-protector conftest.c -lcrypt -lm -lpthread -L/usr/local/lib >&5
conftest.c:228:6: warning: declaration of built-in function '_setjmp' requires inclusion of the header <setjmp.h> [-Wbuiltin-requires-header]
char _setjmp ();
     ^
conftest.c:239:17: error: too few arguments to function call, expected 1, have 0
return _setjmp ();
       ~~~~~~~~~^
1 warning and 1 error generated.
configure:16921: $? = 1
configure: failed program was:

As to why GNU configure tries to call this without arguments, is beyond
me.  To work around its brokenness, I would set ac_cv_func__setjmp to
yes before calling configure.  Or attempt to unbreak autoconf, but that
is a truly Herculean task. :-)

-Dimitry

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