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Date: Sun, 27 Jun 2021 17:50:12 -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>
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Subject: Re: Allegro library would need to be recompiled with -fgnu89-inline
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---- Le sam., 26 juin 2021 18:20:36 -0400 Paul Dufresne <mailto:dufresnep AT zoho DOT com> I wrote ----

>I now think that adding "external" before declarations in .h is the correct solution.

>If they were not mark static already, it is that the value is expected to be shared (being global).

>The solution is *I now think* to add external, and have the real declaration in a unique place, like in main.c.







I can now confirm this is a change in GCC 10 ( from https://gcc.gnu.org/gcc-10/changes.html ):

"GCC now defaults to -fno-common.  As a result, global
      variable accesses are more efficient on various targets.  In C, global
      variables with multiple tentative definitions now result in linker errors.
      With -fcommon such definitions are silently merged during
      linking."



More details in:

https://gcc.gnu.org/gcc-10/porting_to.html#common



I am now realizing it can be tedious to rearrage the code to initialize stuff only once.

-fcommon could allows us to do the bad thing for some time
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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 style=3D"" data-zbluepencil-ignore=3D"true" class=
=3D"zmail_extra"><div id=3D"Zm-_Id_-Sgn1">---- Le sam., 26 juin 2021 18:20:=
36 -0400 <b>Paul Dufresne &lt;<a target=3D"_blank" href=3D"mailto:dufresnep=
@zoho.com">dufresnep AT zoho DOT com</a>&gt;</b> I wrote ----<br></div><div>&gt;I =
now think that adding "external" before declarations in .h is the correct s=
olution.<br></div><blockquote style=3D"margin: 0px;"><div><div style=3D"fon=
t-family :  Verdana,  Arial,  Helvetica,  sans-serif; font-size :  10pt; ">=
<div>&gt;If they were not mark static already, it is that the value is expe=
cted to be shared (being global).<br></div><div>&gt;The solution is *I now =
think* to add external, and have the real declaration in a unique place, li=
ke in main.c.<br></div></div></div></blockquote></div><div><br></div><div>I=
 can now confirm this is a change in GCC 10 ( from <a target=3D"_blank" hre=
f=3D"https://gcc.gnu.org/gcc-10/changes.html">https://gcc.gnu.org/gcc-10/ch=
anges.html</a> ):<br></div><div>"GCC now defaults to <code>-fno-common</cod=
e>.  As a result, global
      variable accesses are more efficient on various targets.  In C, globa=
l
      variables with multiple tentative definitions now result in linker er=
rors.
      With <code>-fcommon</code> such definitions are silently merged durin=
g
      linking."<br></div><div><br></div><div>More details in:<br></div><div=
><a target=3D"_blank" href=3D"https://gcc.gnu.org/gcc-10/porting_to.html#co=
mmon">https://gcc.gnu.org/gcc-10/porting_to.html#common</a><br></div><div><=
br></div><div>I am now realizing it can be tedious to rearrage the code to =
initialize stuff only once.<br></div><div>-fcommon could allows us to do th=
e bad thing for some time<br></div></div><br></body></html>
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