Issue #6592 has been reported by vo.x (Vit Ondruch).

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Bug #6592: test_call_double(DL::TestDL) fails on ARM HardFP
https://bugs.ruby-lang.org/issues/6592

Author: vo.x (Vit Ondruch)
Status: Open
Priority: Normal
Assignee: 
Category: 
Target version: 
ruby -v: ruby 2.0.0dev (2012-06-05 trunk 35922) [armv7hl-linux]


Hi,

I am observing following test suite error on armv7hl Fedora 17 [1] (but it seems that Debian suffers the same issues [3]):

  2) Failure:
test_call_double(DL::TestDL) [/builddir/build/BUILD/ruby-2.0.0-r35922/test/dl/test_dl2.rb:90]:
Expected |0.1 - 2.1638932342073e-311| (0.1) to be < 0.001.

I was digging a bit deeper and I identified issue in this part of code [2]. I tried a bit to unfold the macros and found, that the issue is because of variadic arguments. If the function prototype is declared without them (novar.disasm), the test passes, if they are in use (variadic.disasm), the test fails. The attached files shows the code with partially unfolded marcos and their disassembly. The atof.disasm contains the disassembly of the atof call if it might be of help.

I am not sure if it might be compiler bug (GCC 4.7) or if it should be fixed in Ruby. Any help appreciated


[1] http://arm.koji.fedoraproject.org/koji/getfile?taskID=904523&name=build.log
[2] https://github.com/ruby/ruby/blob/v1_9_3_195/ext/dl/cfunc.c#L464
[3] https://buildd.debian.org/status/fetch.php?pkg=ruby1.9.1&arch=armhf&ver=1.9.3.194-1&stamp=1338887114


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