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clang build fails with `../grub-core/lib/gnulib/regex.h:682:20: error: v

From: Paul Menzel
Subject: clang build fails with `../grub-core/lib/gnulib/regex.h:682:20: error: variable length array used [-Werror,-Wvla]`
Date: Fri, 25 Mar 2022 08:12:16 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.7.0

Dear GRUB folks,

On Debian sid/unstable clang 13.0.1 fails to build GRUB due to a problem in Gnulib:

$ git log --oneline -1 --no-decorate
7c316e183 term/efi/console: Do not set cursor until the first text output
$ ./configure --with-platform=coreboot CC=clang && make
clang -DHAVE_CONFIG_H -I. -I.. -Wall -W -DGRUB_MACHINE_COREBOOT=1 -DGRUB_MACHINE=I386_COREBOOT -m32 -msoft-float -Xclang -msoft-float -Xclang -no-implicit-float -nostdinc -isystem /usr/lib/llvm-13/lib/clang/13.0.1/include -I../include -I../include -DGRUB_FILE=\"commands/regexp.c\" -I. -I. -I.. -I.. -I../include -I../include -I../grub-core/lib/libgcrypt-grub/src/ -I../grub-core/lib/posix_wrap -I../grub-core/lib/gnulib -I../grub-core/lib/gnulib -D_FILE_OFFSET_BITS=64 -std=gnu99 -fno-common -Os -m32 -Wall -W -Wshadow -Wpointer-arith -Wundef -Wchar-subscripts -Wcomment -Wdeprecated-declarations -Wdisabled-optimization -Wdiv-by-zero -Wfloat-equal -Wformat-extra-args -Wformat-security -Wformat-y2k -Wimplicit -Wimplicit-function-declaration -Wimplicit-int -Wmain -Wmissing-braces -Wmissing-format-attribute -Wmultichar -Wparentheses -Wreturn-type -Wsequence-point -Wshadow -Wsign-compare -Wswitch -Wtrigraphs -Wunknown-pragmas -Wunused -Wunused-function -Wunused-label -Wunused-parameter -Wunused-value -Wunused-variable -Wwrite-strings -Wnested-externs -Wstrict-prototypes -g -Wredundant-decls -Wmissing-prototypes -Wmissing-declarations -Wextra -Wattributes -Wendif-labels -Winit-self -Wint-to-pointer-cast -Winvalid-pch -Wmissing-field-initializers -Wnonnull -Woverflow -Wvla -Wpointer-to-int-cast -Wstrict-aliasing -Wvariadic-macros -Wvolatile-register-var -Wpointer-sign -Wmissing-include-dirs -Wmissing-prototypes -Wmissing-declarations -Wformat=2 -march=i386 -falign-functions=1 -freg-struct-return -mno-mmx -mno-sse -mno-sse2 -mno-sse3 -mno-3dnow -fno-dwarf2-cfi-asm -mno-stack-arg-probe -fno-asynchronous-unwind-tables -fno-unwind-tables -fno-ident -Qn -Qunused-arguments -fno-stack-protector -Werror -ffreestanding -fno-builtin -Wno-undef -Wno-sign-compare -Wno-unused -Wno-unused-parameter -Wno-redundant-decls -Wno-unreachable-code -Wno-conversion -MT commands/regexp_module-regexp.o -MD -MP -MF commands/.deps-core/regexp_module-regexp.Tpo -c -o commands/regexp_module-regexp.o `test -f 'commands/regexp.c' || echo './'`commands/regexp.c
In file included from commands/regexp.c:28:
../grub-core/lib/gnulib/regex.h:682:20: error: variable length array used [-Werror,-Wvla]
                                        _REGEX_NELTS (__nmatch)],
../grub-core/lib/gnulib/regex.h:528:27: note: expanded from macro '_REGEX_NELTS'
#  define _REGEX_NELTS(n) n
1 error generated.
make[3]: *** [Makefile:41321: commands/regexp_module-regexp.o] Fehler 1

I tried to use latest Gnulib (not the one defined in `bootstrap.conf`), but the error remains.

How to deal with that, if I am unsure how to fix it? Report it to the Gnulib folks?

Kind regards,


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