commit 452fee36 causes trouble when compiling with clang

[Benno Schulenberg]

Hi,

Running a compile test of nano with the current state of gnulib
(commit 452fee36, "verify: Do use __builtin_assume on clang")
on FreeBSD (which happens to use clang), the compile failed:

clang -DHAVE_CONFIG_H -I. -I..   -D_GNU_SOURCE -D_DEFAULT_SOURCE
-I/usr/include/ncursesw   -g -O1 -march=native -Wvla -Wshadow -Wall -MT regex.o
-MD -MP -MF $depbase.Tpo -c -o regex.o regex.c &&\
mv -f $depbase.Tpo $depbase.Po
In file included from regex.c:74:
./regexec.c:1198:3: error: invalid application of 'typeof' to bit-field
  DEBUG_ASSERT (state->halt);
  ^
./regex_internal.h:42:26: note: expanded from macro 'DEBUG_ASSERT'
# define DEBUG_ASSERT(x) assume (x)
                         ^
./verify.h:327:27: note: expanded from macro 'assume'
    ((void) ({ __typeof__ (R) _gl_verify_temp = (R); \
                          ^
1 error generated.

Stepping one commit back, the compile succeeds fine.

$ clang --version
FreeBSD clang version 8.0.1 (tags/RELEASE_801/final 366581) (based on LLVM 
8.0.1)


Same failure on Ubuntu 18.04 when using clang.

$ clang --version
clang version 6.0.0-1ubuntu2 (tags/RELEASE_600/final)


Benno

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