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Date: Sat, 26 Jun 2021 14:15:56 -0400
From: "Paul Dufresne (dufresnep AT zoho DOT com) [via djgpp AT delorie DOT com]" <djgpp AT delorie DOT com>
To: "djgpp" <djgpp AT delorie DOT com>
Cc: "freedos-devel" <freedos-devel AT lists DOT sourceforge DOT net>
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Subject: Re: Allegro library would need to be recompiled with -fgnu89-inline
?
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Ok I did encounter again a multiple definition error with ld (linking) in a different project today.



The idea seems that if you have multiple files that include some.h, and in it you have functions or

variables not using the static keyword (at least for C), then they will be defined as global, and so,

they will be define each time some.h is included. Making multiple declarations at linking time errors.



Somehow, it seems it is more a problem with gcc 10 (or the linker associated with it) than in previous

versions... not clear how much recent it is.



Did not check how much it apply to Allegro.
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head>=
<meta content=3D"text/html;charset=3DUTF-8" http-equiv=3D"Content-Type"></h=
ead><body ><div style=3D"font-family: Verdana, Arial, Helvetica, sans-serif=
; font-size: 10pt;"><div>Ok I did encounter again a multiple definition err=
or with ld (linking) in a different project today.<br></div><div><br></div>=
<div>The idea seems that if you have multiple files that include some.h, an=
d in it you have functions or<br></div><div>variables not using the static =
keyword (at least for C), then they will be defined as global, and so,<br><=
/div><div>they will be define each time some.h is included. Making multiple=
 declarations at linking time errors.<br></div><div><br></div><div>Somehow,=
 it seems it is more a problem with gcc 10 (or the linker associated with i=
t) than in previous<br></div><div>versions... not clear how much recent it =
is.<br></div><div><br></div><div>Did not check how much it apply to Allegro=
.<br></div><div><br></div><div><br></div></div><br></body></html>
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