With the issue of out-of-tree builds picking up the -in-tree copy of config.h due to the use of #include "config.h", I wondered if we should put a guard in config.h such that if it is used by an out-of-tree build an immediate warning is issued, e.g.
#ifndef IN_TREE_BUILD #error Using __FILE__ in an out-of-tree build #endif And ensuring that in-tree builds define IN_TREE_BUILD. Is there any value in this, are there other files that should also be guarded and is this possible with autconf\automake? -- Graham Bloice
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