On Wed, 2 Nov 2022, Christophe Lyon via Gcc-patches wrote:

> +# Sanity check: make sure we have as many dirnames as options
> +if [ -n "${dirnames}" ]; then
> +    options_arr=($options)

This is an sh script; arrays are a bash feature.  Building GCC isn't 
supposed to need bash (or to rely on $(SHELL) being bash, even when bash 
is available - many GNU/Linux systems use dash for /bin/sh), only a POSIX 
shell.

-- 
Joseph S. Myers
jos...@codesourcery.com

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