Bug #10656: mkmf have_func fails if Ruby is compiled with static libruby

• Status: Third Party's Issue
• Assignee: -
• Target version: 2.2.0
• ruby -v: varies
• Backport: 2.0.0: DONTNEED, 2.1: DONTNEED, 2.2: DONTNEED

[hongli (Hongli Lai)]

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 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.

[nobu (Nobuyoshi Nakada)]

• Status changed from Open to Third Party's Issue

$LIBS is cleared at https://github.com/phusion/passenger/blob/master/ext/ruby/extconf.rb#L24.

[nobu (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

[hongli (Hongli Lai)]

Hm, I see. We clear $LIBS in order to fix https://github.com/phusion/passenger/issues/168, but that may be interfering. Let me investigate this further.

[hongli (Hongli Lai)]

You were right. I've fixed this in Passenger 4.0.57. Thanks Nobuyoshi.