LLVM compile failing in seawasp

Seawasp (using experimental clang 9.0) has been complaining of late:

/home/fabien/clgtk/bin/clang -Wno-ignored-attributes -fno-strict-aliasing -fwrapv -O2 -D__STDC_LIMIT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_CONSTANT_MACROS -D_DEBUG -D_GNU_SOURCE -I/home/fabien/clgtk/include -I../../../../src/include -D_GNU_SOURCE -I/usr/include/libxml2 -flto=thin -emit-llvm -c -o llvmjit_types.bc llvmjit_types.c
In file included from /home/fabien/clgtk/include/llvm/ADT/DenseMapInfo.h:20:0,
from /home/fabien/clgtk/include/llvm/ADT/DenseMap.h:16,
from /home/fabien/clgtk/include/llvm/ADT/DenseSet.h:16,
from /home/fabien/clgtk/include/llvm/ADT/SetVector.h:23,
from llvmjit_inline.cpp:45:
/home/fabien/clgtk/include/llvm/Support/ScalableSize.h:27:12: error: macro "Min" requires 2 arguments, but only 1 given
: Min(Min), Scalable(Scalable) {}
^
In file included from /home/fabien/clgtk/include/llvm/ADT/DenseMapInfo.h:20:0,
from /home/fabien/clgtk/include/llvm/ADT/DenseMap.h:16,
from /home/fabien/clgtk/include/llvm/ADT/DenseSet.h:16,
from /home/fabien/clgtk/include/llvm/ADT/SetVector.h:23,
from llvmjit_inline.cpp:45:
/home/fabien/clgtk/include/llvm/Support/ScalableSize.h: In constructor \xe2\x80\x98llvm::ElementCount::ElementCount(unsigned int, bool)\xe2\x80\x99:
/home/fabien/clgtk/include/llvm/Support/ScalableSize.h:27:13: error: expected \xe2\x80\x98(\xe2\x80\x99 before \xe2\x80\x98,\xe2\x80\x99 token
: Min(Min), Scalable(Scalable) {}
^
<builtin>: recipe for target 'llvmjit_inline.o' failed

This was working earlier, and as far as I can tell the cpluspluscheck
fixes are not the cause (because those happened earlier than the first
failure). Apparently clang got upgraded from "trunk 361691" to "trunk
362290" ... is the new clang broken?

--
Álvaro Herrera 39°50'S 73°21'W