Hi,

it's a genuine build error with Hardknott on Fedora 34:

brotli/c/dec/decode.c:2033:41: error: argument 2 of type ‘const uint8_t *’ {aka ‘const
unsigned char *’} declared as a pointer [-Werror=vla-parameter]
2033 | size_t encoded_size, const uint8_t* encoded_buffer, size_t* decoded_size,
| ~~~~~~~~~~~~~~~^~~~~~~~~~~~~~
In file included from brotli/c/dec/decode.c:7:
./brotli/c/include/brotli/decode.h:204:19: note: previously declared as a variable length
array ‘const uint8_t[*decoded_size]’ {aka ‘const unsigned char[*decoded_size]’}
204 | const uint8_t encoded_buffer[BROTLI_ARRAY_PARAM(encoded_size)],
| ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
brotli/c/dec/decode.c:2034:14: error: argument 4 of type ‘uint8_t *’ {aka ‘unsigned char
*’} declared as a pointer [-Werror=vla-parameter]
2034 | uint8_t* decoded_buffer) {
| ~~~~~~~~~^~~~~~~~~~~~~~
In file included from brotli/c/dec/decode.c:7:
./brotli/c/include/brotli/decode.h:206:13: note: previously declared as a variable length
array ‘uint8_t[encoded_size]’ {aka ‘unsigned char[encoded_size]’}
206 | uint8_t decoded_buffer[BROTLI_ARRAY_PARAM(*decoded_size)]);
| ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors

Comparing GCC 10 and 11, -Wvla-parameter is new in GCC 11 and
it's part of to -Wall.

Best regards,
Zoltán Böszörményi