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gcc: Make exec-tool.in handle missing Binutils more gracefully
When users try to build a cross-compiler without first installing binutils they get confusing errors like: /tmp/gcc-obj/./gcc/as: line 114: exec: -m: invalid option This is an incredibly common source of questions on gcc-help and IRC, and bogus bug reports e.g. see PR 116119 for the latest example. This change adds an explicit check for an empty $original variable and exits with a user-friendly error. gcc/ChangeLog: * exec-tool.in: Exit with an error if $original is empty.
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@ -81,6 +81,14 @@ case "$invoked" in
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;;
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esac
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if test -z "$original"
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then
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echo "$0: \$original is unset" >&2
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echo "This probably means there is no '$invoked' for the target." >&2
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echo "For a cross-compiler, you probably need to install Binutils first." >&2
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exit 1
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fi
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case "$original" in
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../*)
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# compute absolute path of the location of this script
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