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Date: Thu, 27 Mar 2025 13:30:24 -0400
From: "Paul Dufresne (dufresnep AT zoho DOT com) [via djgpp AT delorie DOT com]" <djgpp AT delorie DOT com>
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Subject: Allegro: fixing compilation stdint.h:22:21: error: duplicate
 'signed'
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This is a trick about compiling Allegro programs that use #include <stdint.h>

I was getting the following errors:
i586-pc-msdosdjgpp-gcc -Wall -O2 -g -fcommon    -c -o src/bullet.o src/bullet.c
In file included from /usr/local/djgpp/i586-pc-msdosdjgpp/sys-include/allegro/internal/alconfig.h:66,
                 from /usr/local/djgpp/i586-pc-msdosdjgpp/sys-include/allegro/base.h:41,
                 from /usr/local/djgpp/i586-pc-msdosdjgpp/sys-include/allegro.h:25,
                 from src/bullet.c:1:
/usr/local/djgpp/i586-pc-msdosdjgpp/sys-include/stdint.h:22:21: error: duplicate 'signed'
   22 | typedef signed char int8_t;
      |                     ^~~~~~
/usr/local/djgpp/i586-pc-msdosdjgpp/sys-include/stdint.h:22:21: error: two or more data types in declaration specifiers
   22 | typedef signed char int8_t;
      |                     ^~~~~~
/usr/local/djgpp/i586-pc-msdosdjgpp/sys-include/stdint.h:23:23: error: duplicate 'unsigned'
   23 | typedef unsigned char uint8_t;
      |                       ^~~~~~~
/usr/local/djgpp/i586-pc-msdosdjgpp/sys-include/stdint.h:23:23: error: two or more data types in declaration specifiers
   23 | typedef unsigned char uint8_t;
      |                       ^~~~~~~
/usr/local/djgpp/i586-pc-msdosdjgpp/sys-include/stdint.h:29:26: error: duplicate 'signed'
   29 | typedef signed short int int16_t;
      |                          ^~~~~~~
/usr/local/djgpp/i586-pc-msdosdjgpp/sys-include/stdint.h:29:26: error: duplicate 'short'
   29 | typedef signed short int int16_t;
      |                          ^~~~~~~
/usr/local/djgpp/i586-pc-msdosdjgpp/sys-include/stdint.h:30:28: error: duplicate 'unsigned'
   30 | typedef unsigned short int uint16_t;
      |                            ^~~~~~~~
/usr/local/djgpp/i586-pc-msdosdjgpp/sys-include/stdint.h:30:28: error: duplicate 'short'
   30 | typedef unsigned short int uint16_t;


Depending a bit on the order of my #include.

I discovered that if I add to CFLAGS: -DALLEGRO_HAVE_STDINT_H

Then this problem goes away, becaue Allegro, rather than guessing types,
would use #include , so definition are not made 2 times anymore
causing theses errors.