[Bug bootstrap/87741] Don't build readline/libreadline.a in GDB, when --with-system-readline is supplied

[dilyan.palauzov at aegee dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87741

--- Comment #2 from Дилян Палаузов <dilyan.palauzov at aegee dot org> ---
Created attachment 44905
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44905&action=edit
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