[ruby-core:111093] [Ruby master Bug#19161] Cannot compile 3.0.5 or 3.1.3 on Red Hat Enterprise Linux 7

["werebus (Matt Moretti)" <noreply@ruby-lang.org>]

Issue #19161 has been updated by werebus (Matt Moretti).


Thanks everyone,

I can confirm that adding `cflags="-std=gnu99"` to the configure step worked around my issue. Re-running `./autogen.sh` on the server in question also worked.

----------------------------------------
Bug #19161: Cannot compile 3.0.5 or 3.1.3 on Red Hat Enterprise Linux 7
https://bugs.ruby-lang.org/issues/19161#change-100358

* Author: werebus (Matt Moretti)
* Status: Closed
* Priority: Normal
* Backport: 2.7: DONTNEED, 3.0: REQUIRED, 3.1: REQUIRED
----------------------------------------
When attempting to run `make` on either the 3.0.5 or 3.1.3 release, I get the following error (I included the whole output as it's pretty short):


```
	BASERUBY = /opt/ruby/bin/ruby --disable=gems
	CC = gcc -std=gnu11
	LD = ld
	LDSHARED = gcc -std=gnu11 -shared
	CFLAGS = -O3 -fno-fast-math -ggdb3 -Wall -Wextra -Wdeprecated-declarations -Wimplicit-function-declaration -Wimplicit-int -Wpointer-arith -Wwrite-strings -Wold-style-definition -Wmissing-noreturn -Wno-cast-function-type -Wno-constant-logical-operand -Wno-long-long -Wno-missing-field-initializers -Wno-overlength-strings -Wno-packed-bitfield-compat -Wno-parentheses-equality -Wno-self-assign -Wno-tautological-compare -Wno-unused-parameter -Wno-unused-value -Wsuggest-attribute=format -Wsuggest-attribute=noreturn -Wunused-variable  
	XCFLAGS = -D_FORTIFY_SOURCE=2 -fstack-protector-strong -fno-strict-overflow -fvisibility=hidden -fexcess-precision=standard -DRUBY_EXPORT -fPIE -I. -I.ext/include/x86_64-linux -I./include -I. -I./enc/unicode/13.0.0
	CPPFLAGS =   
	DLDFLAGS = -Wl,--compress-debug-sections=zlib -fstack-protector-strong -pie  
	SOLIBS = -lz -lpthread -lrt -lrt -ldl -lcrypt -lm 
	LANG = en_US.UTF-8
	LC_ALL = 
	LC_CTYPE = 
	MFLAGS = 
gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-44)
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.

compiling ./main.c
compiling dmydln.c
compiling miniinit.c
In file included from vm_core.h:83:0,
                 from iseq.h:14,
                 from mini_builtin.c:3,
                 from miniinit.c:51:
thread_pthread.h:108:43: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘struct’
     RUBY_EXTERN RB_THREAD_LOCAL_SPECIFIER struct rb_execution_context_struct *ruby_current_ec;
                                           ^
In file included from iseq.h:14:0,
                 from mini_builtin.c:3,
                 from miniinit.c:51:
vm_core.h: In function ‘rb_current_execution_context’:
vm_core.h:1870:34: error: ‘ruby_current_ec’ undeclared (first use in this function)
     rb_execution_context_t *ec = ruby_current_ec;
                                  ^
vm_core.h:1870:34: note: each undeclared identifier is reported only once for each function it appears in
miniinit.c: At top level:
cc1: warning: unrecognized command line option "-Wno-tautological-compare" [enabled by default]
cc1: warning: unrecognized command line option "-Wno-self-assign" [enabled by default]
cc1: warning: unrecognized command line option "-Wno-parentheses-equality" [enabled by default]
cc1: warning: unrecognized command line option "-Wno-constant-logical-operand" [enabled by default]
cc1: warning: unrecognized command line option "-Wno-cast-function-type" [enabled by default]
make: *** [miniinit.o] Error 1

```

Both Ruby 3.0.4 and 3.1.2 build without error and pass (all but one of) the `make check` tests.

I know RHEL 7 is getting to be pretty old; I suspect a factor here are the ancient build tools available to me. But... EOL for Ruby 2.7 comes before the one for RHEL 7, so I'm trying to prioritize.



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