From: jaruga@...
Date: 2021-08-12T18:16:25+00:00
Subject: [ruby-core:104901] [Ruby master Bug#18073] test/ruby/test_jit.rb: "error: invalid use of '__builtin_va_arg_pack ()'" on Ruby 2.7.4 on gcc 4.8.5

Issue #18073 has been updated by jaruga (Jun Aruga).


jaruga (Jun Aruga) wrote in #note-4:
> I executed `git bisect` between `v2_7_3` and `v2_7_4`. And I found the following commit causes these test failures.
> 
> Fix 2.7 build
> https://github.com/ruby/ruby/commit/29bbad939939c6dceb804aac667ba372fdee4ef5

As a temporary workaround to build Ruby 2.7.4 on RHEL7, I am applying a patch to revert above commit, and I see the test failures in test/ruby/test_jit.rb are gone.




----------------------------------------
Bug #18073: test/ruby/test_jit.rb: "error: invalid use of '__builtin_va_arg_pack ()'" on Ruby 2.7.4 on gcc 4.8.5
https://bugs.ruby-lang.org/issues/18073#change-93261

* Author: jaruga (Jun Aruga)
* Status: Open
* Priority: Normal
* Backport: 2.6: UNKNOWN, 2.7: REQUIRED, 3.0: DONTNEED
----------------------------------------
I hit the following JIT test failures causing the following error on v2_7_4 tag (Ruby 2.7.4) with gcc 4.8.5 on RHEL 7. The tests work on Ruby 2.7.3 and also works on Ruby 3.0.2.

```
/mnt/git/ruby/ruby/.ext/include/x86_64-linux/rb_mjit_min_header-2.7.4.h: In function 'sprintf':
/mnt/git/ruby/ruby/.ext/include/x86_64-linux/rb_mjit_min_header-2.7.4.h:442:3: error: invalid use of '__builtin_va_arg_pack ()'
   return __builtin___sprintf_chk (__s, 2 - 1, 
   ^
```

```
$ which gcc
/usr/bin/gcc

$ gcc --version
gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-39) 
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

$ git branch
* (detached from v2_7_4)
... 

$ autoconf
$ ./configure --enable-shared 2>&1 | tee configure.log
$ make 2>&1 | tee make.log
```

Here is one of the failures. I would attach the full long files on this ticket.

```
$ make test-all TESTS="-v test/ruby/test_jit.rb" 2>&1 | tee make_test-all_test_jit.log
...
 30) Failure:
TestJIT#test_compile_insn_local [/mnt/git/ruby/ruby/test/ruby/test_jit.rb:62]:
Expected 1 times of JIT success, but succeeded 0 times.

script:
"""
p proc {  
  foo = 1
  foo  
}.call
"""


stderr:
"""
/mnt/git/ruby/ruby/.ext/include/x86_64-linux/rb_mjit_min_header-2.7.4.h: In function 'sprintf':
/mnt/git/ruby/ruby/.ext/include/x86_64-linux/rb_mjit_min_header-2.7.4.h:442:3: error: invalid use of '__builtin_va_arg_pack ()'
   return __builtin___sprintf_chk (__s, 2 - 1, 
   ^
compilation terminated due to -Wfatal-errors.
Successful MJIT finish

"""

..
<1> expected but was
<0>.
...
Finished tests in 29.837252s, 3.1504 tests/s, 15.7186 assertions/s.
94 tests, 469 assertions, 87 failures, 0 errors, 4 skips
...
```


---Files--------------------------------
configure.log (27.6 KB)
make.log (102 KB)
make_test-all_test_jit.log (77 KB)


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