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Date:	Thu, 10 Dec 2020 20:26:10 +0100
From:	"Juan Manuel Guerrero (juan DOT guerrero AT gmx DOT de) [via djgpp AT delorie DOT com]" <djgpp AT delorie DOT com>
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To:	djgpp AT delorie DOT com
Subject:	Re: Difficulties compiling libc from repository using gcc 10.N.0
References:	<5FD1FEA1 DOT 7010304 AT gmx DOT de> <8816d501-9f33-4d68-4235-1935a83580f6 AT gmail DOT com> <CAA2C=vACivjbYiU7yVpyFdzKjjKB10E1tvqShLPQ6i31cuKrDA AT mail DOT gmail DOT com> <111383e4-b3db-f346-b71c-749dee17dc9e AT gmail DOT com> <CAA2C=vDL+YWHssNteT71jUNxYAJkxwiNXrKp1O618tY6bHHcxg AT mail DOT gmail DOT com>
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Am 10.12.2020 18:44, schrieb Ozkan Sezer (sezeroz AT gmail DOT com) [via djgpp AT delorie DOT com]:
> On 12/10/20, J.W. Jagersma (jwjagersma AT gmail DOT com) [via
> djgpp AT delorie DOT com]<djgpp AT delorie DOT com>  wrote:
>>> Which are the duplicated symbols causing trouble?
>>
>> Only __stdio_cleanup_hook in libc, which I marked extern, and almost all global
>> symbols in fsdb.  I figured it would be okay to compile just fsdb with -fcommon.
>
> The attached patch avoid duplicated symbols with gcc-10
> where -fno-common is on by default.
>
> The patch is from J. W. Jagersma, I only added comments.
> OK to apply?
>
> --
> O.S.


As has been told, a lot of these issues are triggered by different values of
the -O flag.  To get it compiled with -O2 the makefile of the djtar directory
had to be adjusted accordingly.  Of course, because we use -Werror the repository
code does not compile out-of-the-box.  So here a some work remains to be done
for some one who has the time to fix all the issues.
But with removed -Werror it compoiles so far.

Regards,
Juan M. Guerrero


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 filename="djtar.patch"

avoid duplicated symbols with gcc-10 where -fno-common is on by default

patch from J. W. Jagersma.

diff -aprNU3 djgpp.orig/src/utils/djtar/makefile djgpp/src/utils/djtar/mak=
efile
=2D-- djgpp.orig/src/utils/djtar/makefile	2098-07-04 10:19:56 +0000
+++ djgpp/src/utils/djtar/makefile	2020-12-10 19:34:14 +0000
@@ -1,3 +1,4 @@
+# Copyright (C) 2020 DJ Delorie, see COPYING.DJ for details
 # Copyright (C) 2015 DJ Delorie, see COPYING.DJ for details
 # Copyright (C) 2002 DJ Delorie, see COPYING.DJ for details
 # Copyright (C) 2000 DJ Delorie, see COPYING.DJ for details
@@ -33,6 +34,9 @@ EXTRA_FILES +=3D $(BIN)/djtart.exe
 include $(TOP)/../makefile.inc
 XGCC =3D $(XLGCC)

+# Avoid duplicated symbols with gcc-10 where -fno-common is on by default=
.
+CFLAGS +=3D -fcommon
+
 all :: $(BIN)/djtar.exe

 $(BIN)/djtar.exe : $(C) $(EOBJS) $(L)

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