At present I can't build glibc in rawhide because make segfaults:

+ make -j4 -O -r 'CFLAGS=-mtune=generic -g -O2  -fstack-clash-protection'
make -r PARALLELMFLAGS="" -C .. objdir=`pwd` all
make: *** [Makefile:9: all] Segmentation fault (core dumped)
error: Bad exit status from /var/tmp/rpm-tmp.g0o5R3 (%build)

cvc4 shows the same problem:

Making all in src
/bin/sh: line 12: 16161 Segmentation fault      (core dumped) make $local_target

We should tag in the last known good make.

I've run out of time to debug this but I wanted to pass on my notes.

(1) Run the testsuite.

If the package you rebuild has a testsuite please make sure you run it
and review the results.

The make testsuite was not run, there is a driver problem with it.

Sadly, the make testsuite hasn't been run since F26:
https://kojipkgs.fedoraproject.org//packages/make/4.2.1/2.fc26/data/logs/x86_64/build.log
where it passed with no failures.

We should strive hard to make sure that testsuite runs every time,
and that the results are 100% pass.

(2) make segfaults here.

#0  0x00005555557b1ad1 in ?? ()
#1  0x00007ffff6fd4c7b in glob_in_dir () from /lib64/libc.so.6
#2  0x00007ffff6fd5b9f in glob@@GLIBC_2.27 () from /lib64/libc.so.6
#3  0x000055555557551c in parse_file_seq ()
#4  0x00005555555673f7 in func_wildcard ()
#5  0x0000555555569501 in handle_function ()
#6  0x0000555555562cfb in variable_expand_string ()
#7  0x0000555555563833 in allocated_variable_expand_for_file ()
#8  0x00005555555671cf in func_foreach ()
#9  0x0000555555569501 in handle_function ()
#10 0x0000555555562cfb in variable_expand_string ()
#11 0x00005555555773c7 in eval ()
#12 0x00005555555775f1 in eval_makefile ()
#13 0x00005555555767ce in eval ()
#14 0x00005555555775f1 in eval_makefile ()
#15 0x0000555555577a38 in read_all_makefiles ()
#16 0x000055555555e375 in main ()

You have to set follow-fork-mode child, and set detach-on-fork off
to catch the faulting child process in gdb (and flip between processes
to run them in sequence).

(3) Building make-4.2.1-5 in F27 works.

A `fedpkg local` build of make make-4.2.1-5.fc28 results in binaries
that work. This worries me a little because it looks like a toolchain
interaction.

When I come back online I'll keep trying to fix this.

-- 
Cheers,
Carlos.
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