Issue #10656 has been updated by Nobuyoshi Nakada.

Backport changed from 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN to 2.0.0: DONTNEED, 2.1: DONTNEED, 2.2: DONTNEED

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Bug #10656: mkmf have_func fails if Ruby is compiled with static libruby
https://bugs.ruby-lang.org/issues/10656#change-50673

* Author: Hongli Lai
* Status: Third Party's Issue
* Priority: Normal
* Assignee: 
* Category: 
* Target version: current: 2.2.0
* ruby -v: varies
* Backport: 2.0.0: DONTNEED, 2.1: DONTNEED, 2.2: DONTNEED
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If Ruby is compiled with static libruby, then mkmf have_func calls will fail. This is because have_func tries to compile a binary, passing -lruby-static to the compiler. However this fails because binary also needs to be linked to a bunch of libraries that ruby-static.a depends on, such as -lm, -lrt, -ldl etc.

See [Phusion Passenger bug 1314 comment 68140592](https://github.com/phusion/passenger/issues/1314#issuecomment-68140592) for details and for an mkmf.log. Users who have a static libruby are unable to use the Phusion Passenger native extension, because a `have_func('rb_thread_call_without_gvl')` failed where it should have succeeded.



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