[ruby-core:106467] [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 ivoanjo (Ivo Anjo).


I run into a similar issue; in my case, I was running the Semaphore CI Ruby image for 2.7.5 and when trying to run with JIT I get the same failures

```
semaphore@semaphore-vm:~$ ruby -v
ruby 2.7.5p203 (2021-11-24 revision f69aeb8314) [x86_64-linux]

semaphore@semaphore-vm:~$ gcc -v 2>&1 | grep "gcc version"
gcc version 4.8.5 (Ubuntu 4.8.5-4ubuntu8)

semaphore@semaphore-vm:~$ ruby --jit --jit-warnings --jit-debug --jit-verbose=2 -e 'def foo; end; while true; foo; end'
MJIT: CC defaults to /usr/bin/gcc
MJIT: tmp_dir is /tmp
Creating precompiled header
Starting process: /usr/bin/gcc /usr/bin/gcc -std=gnu99 -w -Wfatal-errors -fPIC -shared -w -pipe -ggdb3 -nodefaultlibs -nostdlib -o /tmp/_ruby_mjit_hp4368u0.h.gch /home/semaphore/.rbenv/versions/2.7.5/include/ruby-2.7.0/x86_64-linux/rb_mjit_min_header-2.7.5.h
start compilation: foo@-e:1 -> /tmp/_ruby_mjit_p4368u1.c
Starting process: /usr/bin/gcc /usr/bin/gcc -std=gnu99 -w -Wfatal-errors -fPIC -shared -w -pipe -ggdb3 -o /tmp/_ruby_mjit_p4368u1.o /tmp/_ruby_mjit_p4368u1.c -c -nostartfiles -nodefaultlibs -nostdlib
/home/semaphore/.rbenv/versions/2.7.5/include/ruby-2.7.0/x86_64-linux/rb_mjit_min_header-2.7.5.h: In function 'sprintf':
/home/semaphore/.rbenv/versions/2.7.5/include/ruby-2.7.0/x86_64-linux/rb_mjit_min_header-2.7.5.h:406:3: error: invalid use of '__builtin_va_arg_pack ()'
   return __builtin___sprintf_chk (__s, 2 - 1,
   ^
compilation terminated due to -Wfatal-errors.
compile_c_to_o: compile error: 1
Failed to generate so: /tmp/_ruby_mjit_p4368u1.so
start compilation: block in already_loaded?@/home/semaphore/.rbenv/versions/2.7.5/lib/ruby/site_ruby/2.7.0/rubygems.rb:1290 -> /tmp/_ruby_mjit_p4368u0.c
Starting process: /usr/bin/gcc /usr/bin/gcc -std=gnu99 -w -Wfatal-errors -fPIC -shared -w -pipe -ggdb3 -o /tmp/_ruby_mjit_p4368u0.o /tmp/_ruby_mjit_p4368u0.c -c -nostartfiles -nodefaultlibs -nostdlib
/home/semaphore/.rbenv/versions/2.7.5/include/ruby-2.7.0/x86_64-linux/rb_mjit_min_header-2.7.5.h: In function 'sprintf':
/home/semaphore/.rbenv/versions/2.7.5/include/ruby-2.7.0/x86_64-linux/rb_mjit_min_header-2.7.5.h:406:3: error: invalid use of '__builtin_va_arg_pack ()'
   return __builtin___sprintf_chk (__s, 2 - 1,
   ^
compilation terminated due to -Wfatal-errors.
compile_c_to_o: compile error: 1
Failed to generate so: /tmp/_ruby_mjit_p4368u0.so
```

Would it make sense to perhaps validate that the mjit header is compilable after generating it?

----------------------------------------
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-95124

* 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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