I'm seeing some build breakage that I bisected to commit 4e56207130eda:

>   CC      kernel/bounds.s
> In file included from /home/davehans/linux.git/include/asm-generic/bug.h:15:0,
>                  from /home/davehans/linux.git/arch/x86/include/asm/bug.h:81,
>                  from /home/davehans/linux.git/include/linux/bug.h:4,
>                  from /home/davehans/linux.git/include/linux/page-flags.h:9,
>                  from /home/davehans/linux.git/kernel/bounds.c:9:
> /home/davehans/linux.git/include/linux/kernel.h:5:20: fatal error: stdarg.h: No such file or directory
>  #include <stdarg.h>
>                     ^
> compilation terminated.

It's odd because I'm pretty sure I've done 4.15-rc compiles on this
system before without issues.  I suspect something in my config
(attached) is triggering this.

Does this look familiar to anyone?

gcc -v
Using built-in specs.
COLLECT_GCC=/usr/bin/gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-redhat-linux/6.4.1/lto-wrapper
Target: x86_64-redhat-linux
Configured with: ../configure --enable-bootstrap
--enable-languages=c,c++,objc,obj-c++,fortran,ada,go,lto --prefix=/usr
--mandir=/usr/share/man --infodir=/usr/share/info
--with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-shared
--enable-threads=posix --enable-checking=release --enable-multilib
--with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions
--enable-gnu-unique-object --enable-linker-build-id
--with-linker-hash-style=gnu --enable-plugin --enable-initfini-array
--disable-libgcj --with-isl --enable-libmpx
--enable-gnu-indirect-function --with-tune=generic --with-arch_32=i686
--build=x86_64-redhat-linux
Thread model: posix
gcc version 6.4.1 20170727 (Red Hat 6.4.1-1) (GCC)