Issue #12511 has been reported by Graham Menhennitt.

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Bug #12511: can't build 2.4.0-preview1 on Centos 5
https://bugs.ruby-lang.org/issues/12511

* Author: Graham Menhennitt
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: 2.4.0-preview1
* Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
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Building Ruby 2.4.0-preview1 fails on Centos 5 with the error below. I know that this is an ancient version, but...

Graham

% gcc -v
Using built-in specs.
Target: i386-redhat-linux
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --enable-shared --enable-threads=posix --enable-checking=release --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-libgcj-multifile --enable-languages=c,c++,objc,obj-c++,java,fortran,ada --enable-java-awt=gtk --disable-dssi --disable-plugin --with-java-home=/usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/jre --with-cpu=generic --host=i386-redhat-linux
Thread model: posix
gcc version 4.1.2 20080704 (Red Hat 4.1.2-55)




% make
...
vm_exec.c: In function 'vm_exec_core':
vm_exec.c:127: error: unable to find a register to spill in class 'SIREG'
vm_exec.c:127: error: this is the insn:
(insn:HI 9292 9290 9293 1119 vm.c:790 (parallel [
            (set (reg:SI 2 cx [2872])
                (const_int 0 [0x0]))
            (set (reg/f:SI 2869 [ proc ])
                (plus:SI (ashift:SI (reg:SI 2 cx [2871])
                        (const_int 2 [0x2]))
                    (reg/v/f:SI 5 di [orig:1244 proc ] [1244])))
            (set (reg/f:SI 2870 [ block ])
                (plus:SI (ashift:SI (reg:SI 2 cx [2871])
                        (const_int 2 [0x2]))
                    (reg/v/f:SI 1253 [ blockptr ])))
            (set (mem/s:BLK (reg/v/f:SI 5 di [orig:1244 proc ] [1244]) [16 <variable>.block+0 S16 A32])
                (mem/s:BLK (reg/v/f:SI 1253 [ blockptr ]) [16 S16 A32]))
            (use (reg:SI 2 cx [2871]))
            (use (reg:SI 19 dirflag))
        ]) 528 {*rep_movsi} (insn_list:REG_DEP_TRUE 9285 (insn_list:REG_DEP_TRUE 9289 (insn_list:REG_DEP_TRUE 9290 (nil))))
    (expr_list:REG_UNUSED (reg/f:SI 2870 [ block ])
        (expr_list:REG_UNUSED (reg/f:SI 2869 [ proc ])
            (expr_list:REG_UNUSED (reg:SI 2 cx [2872])
                (expr_list:REG_DEAD (reg:SI 19 dirflag)
                    (expr_list:REG_DEAD (reg/v/f:SI 1253 [ blockptr ])
                        (expr_list:REG_DEAD (reg:SI 2 cx [2871])
                            (expr_list:REG_UNUSED (reg/f:SI 2870 [ block ])
                                (expr_list:REG_UNUSED (reg/f:SI 2869 [ proc ])
                                    (expr_list:REG_UNUSED (reg:SI 2 cx [2872])
                                        (nil)))))))))))
vm_exec.c:127: confused by earlier errors, bailing out
make: *** [vm.o] Error 1




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