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From: "Ozkan Sezer (sezeroz AT gmail DOT com) [via djgpp AT delorie DOT com]" <djgpp AT delorie DOT com>
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Subject: Re: Difficulties compiling libc from repository using gcc 10.N.0
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The v1.2 commit to machine/endian.h defined some macros which may be
problematic, e.g. __BIG_ENDIAN__: notice the leading _and_ trailing
double-underscores.
http://www.delorie.com/bin/cvsweb.cgi/djgpp/include/machine/endian.h

Gcc from big-endian targeting toolchains have a tendency for defining
__BIG_ENDIAN__, e.g.:

$ /opt/cross_osx-ppc/bin/powerpc-apple-darwin9-gcc -E -dD -xc /dev/null | \
  grep ENDIAN
#define __BIG_ENDIAN__ 1
#define _BIG_ENDIAN 1

$ /gg/bin/ppc-morphos-gcc -E -dD -xc /dev/null | grep ENDIAN
#define __BIG_ENDIAN__ 1
#define _BIG_ENDIAN 1

$ /opt/cross_amigaos4/bin/ppc-amigaos-gcc -E -dD -xc /dev/null | \
  grep ENDIAN
#define __BIG_ENDIAN__ 1
#define _BIG_ENDIAN 1

I suggest removing the additional macros with both leading and trailing
double-underscores, i.e. like the following patch:

Index: include/machine/endian.h
===================================================================
RCS file: /cvs/djgpp/djgpp/include/machine/endian.h,v
retrieving revision 1.2
diff -u -r1.2 endian.h
--- include/machine/endian.h	6 Jan 2021 14:55:05 -0000	1.2
+++ include/machine/endian.h	13 Jan 2021 16:23:19 -0000
@@ -54,11 +54,6 @@
 #define __PDP_ENDIAN       PDP_ENDIAN
 #define __BYTE_ORDER       LITTLE_ENDIAN

-#define __LITTLE_ENDIAN__  LITTLE_ENDIAN
-#define __BIG_ENDIAN__     BIG_ENDIAN
-#define __PDP_ENDIAN__     PDP_ENDIAN
-#define __BYTE_ORDER__     LITTLE_ENDIAN
-

 #include <sys/cdefs.h>


--
O.S.