mescc: Non-Guix support. Thanks rain1!

* mlibc/include: Neutralize include guards before #include_next.
  Fixes compiling tinycc on Debian GNU/Linux.

mlibc/include/alloca.h

@@ -24,6 +24,7 @@
 #ifndef _GNU_SOURCE
 #define _GNU_SOURCE
 #endif
+#undef __MES_ALLOCA_H 1
 #include_next <alloca.h>
 
 #else // ! (__GNUC__ && POSIX)

mlibc/include/assert.h

@@ -24,6 +24,7 @@
 #ifndef _GNU_SOURCE
 #define _GNU_SOURCE
 #endif
+#undef __MES_ASSERT_H
 #include_next <assert.h>
 #else // ! (__GNUC__ && POSIX)
 #define assert(x) ((x) ? (void)0 : assert_fail (#x))

mlibc/include/ctype.h

@@ -24,6 +24,7 @@
 #ifndef _GNU_SOURCE
 #define _GNU_SOURCE
 #endif
+#undef __MES_CTYPE_H
 #include_next <ctype.h>
 
 #else // ! (__GNUC__ && POSIX)

mlibc/include/dlfcn.h

@@ -21,6 +21,7 @@
 #define __MES_DLFCN_H 1
 
 #if __GNUC__ && POSIX
+#undef __MES_DLFCN_H
 #include_next <dlfcn.h>
 #endif // (__GNUC__ && POSIX)
 

mlibc/include/errno.h

@@ -24,6 +24,7 @@
 #ifndef _GNU_SOURCE
 #define _GNU_SOURCE
 #endif
+#undef __MES_ERRNO_H
 #include_next <errno.h>
 #endif // ! (__GNUC__ && POSIX)
 

mlibc/include/fcntl.h

@@ -24,6 +24,7 @@
 #ifndef _GNU_SOURCE
 #define _GNU_SOURCE
 #endif
+#undef __MES_FCNTL_H
 #include_next <fcntl.h>
 
 #else // ! (__GNUC__ && POSIX)

mlibc/include/features.h

@@ -21,6 +21,7 @@
 #define __MES_FEATURES_H 1
 
 #if __GNUC__ && POSIX
+#undef __MES_FEATURES_H
 #include_next <features.h>
 #endif // (__GNUC__ && POSIX)
 

mlibc/include/inttypes.h

@@ -24,6 +24,7 @@
 #ifndef _GNU_SOURCE
 #define _GNU_SOURCE
 #endif
+#undef __MES_INTTYPES_H
 #include_next <inttypes.h>
 #else // ! (__GNUC__ && POSIX)
 

mlibc/include/libgen.h

@@ -24,6 +24,7 @@
 #ifndef _GNU_SOURCE
 #define _GNU_SOURCE
 #endif
+#undef __MES_LIBGEN_H
 #include_next <libgen.h>
 
 #else // ! (__GNUC__ && POSIX)

mlibc/include/limits.h

@@ -24,6 +24,7 @@
 #ifndef _GNU_SOURCE
 #define _GNU_SOURCE
 #endif
+#undef __MES_LIMITS_H
 #include_next <limits.h>
 
 #else // ! (__GNUC__ && POSIX)

mlibc/include/locale.h

@@ -24,6 +24,7 @@
 #ifndef _GNU_SOURCE
 #define _GNU_SOURCE
 #endif
+#undef __MES_LOCALE_H
 #include_next <locale.h>
 
 #else // ! (__GNUC__ && POSIX)

mlibc/include/math.h

@@ -21,6 +21,7 @@
 #define __MES_MATH_H 1
 
 #if __GNUC__ && POSIX
+#undef __MES_MATH_H
 #include_next <math.h>
 #endif // (__GNUC__ && POSIX)
 

mlibc/include/setjmp.h

@@ -21,6 +21,7 @@
 #define __MES_SETJMP_H 1
 
 #if __GNUC__ && POSIX
+#undef __MES_SETJMP_H
 #include_next <setjmp.h>
 #else // ! (__GNUC__ && POSIX)
 

mlibc/include/signal.h

@@ -21,6 +21,7 @@
 #define __MES_SIGNAL_H 1
 
 #if __GNUC__ && POSIX
+#undef __MES_SIGNAL_H
 #include_next <signal.h>
 #endif // (__GNUC__ && POSIX)
 

mlibc/include/stdarg.h

@@ -21,6 +21,7 @@
 #define __MES_STDARG_H 1
 
 #if __GNUC__ && POSIX
+#undef __MES_STDARG_H
 #include_next <stdarg.h>
 #else // ! (__GNUC__ && POSIX)
 

mlibc/include/stdbool.h

@@ -24,6 +24,7 @@
 #ifndef _GNU_SOURCE
 #define _GNU_SOURCE
 #endif
+#undef __MES_STDBOOL_H
 #include_next <stdbool.h>
 
 #else // ! (__GNUC__ && POSIX)

mlibc/include/stdint.h

@@ -24,6 +24,7 @@
 #ifndef _GNU_SOURCE
 #define _GNU_SOURCE
 #endif
+#undef __MES_STDINT_H
 #include_next <stdint.h>
 
 #else // ! (__GNUC__ && POSIX)

mlibc/include/stdio.h

@@ -37,6 +37,7 @@ int sprintf (char *str, char const* format, ...);
 #ifndef _GNU_SOURCE
 #define _GNU_SOURCE
 #endif
+#undef __MES_STDIO_H
 #include_next <stdio.h>
 
 int fdputs (char const* s, int fd);

mlibc/include/stdlib.h

@@ -24,6 +24,7 @@
 #ifndef _GNU_SOURCE
 #define _GNU_SOURCE
 #endif
+#undef __MES_STDLIB_H
 #include_next <stdlib.h>
 #else  // !(__GNUC__ && POSIX)
 

mlibc/include/stdnoreturn.h

@@ -24,6 +24,7 @@
 #ifndef _GNU_SOURCE
 #define _GNU_SOURCE
 #endif
+#undef __MES_STDNORETURN_H
 #include_next <stdnoreturn.h>
 
 #else // ! (__GNUC__ && POSIX)

mlibc/include/string.h

@@ -24,6 +24,7 @@
 #ifndef _GNU_SOURCE
 #define _GNU_SOURCE
 #endif
+#undef __MES_STRING_H
 #include_next <string.h>
 
 #else // ! (__GNUC__ && POSIX)

mlibc/include/strings.h

@@ -21,6 +21,7 @@
 #define __MES_STRINGS_H 1
 
 #if __GNUC__ && POSIX
+#undef __MES_STRINGS_H
 #include_next <strings.h>
 #endif // (__GNUC__ && POSIX)
 

mlibc/include/sys/cdefs.h

@@ -21,6 +21,7 @@
 #define __MES_SYS_CDEFS_H 1
 
 #if __GNUC__ && POSIX
+#undef __MES_SYS_CDEFS_H
 #include_next <sys/cdefs.h>
 #endif // (__GNUC__ && POSIX)
 

mlibc/include/sys/mman.h

@@ -21,6 +21,7 @@
 #define __MES_SYS_MMAN_H 1
 
 #if __GNUC__ && POSIX
+#undef __MES_SYS_MMAN_H
 #include_next <sys/mman.h>
 #endif // (__GNUC__ && POSIX)
 

mlibc/include/sys/stat.h

@@ -21,6 +21,7 @@
 #define __MES_SYS_STAT_H 1
 
 #if __GNUC__ && POSIX
+#undef __MES_SYS_STAT_H
 #include_next <sys/stat.h>
 #endif // (__GNUC__ && POSIX)
 

mlibc/include/sys/time.h

@@ -21,6 +21,7 @@
 #define __MES_SYS_TIME_H 1
 
 #if __GNUC__ && POSIX
+#undef __MES_SYS_TIME_H
 #include_next <sys/time.h>
 #endif // (__GNUC__ && POSIX)
 

mlibc/include/sys/timeb.h

@@ -21,6 +21,7 @@
 #define __MES_SYS_TIMEB_H 1
 
 #if __GNUC__ && POSIX
+#undef __MES_SYS_TIMEB_H
 #include_next <sys/timeb.h>
 #endif // (__GNUC__ && POSIX)
 

mlibc/include/sys/types.h

@@ -21,6 +21,7 @@
 #define __MES_SYS_TYPES_H 1
 
 #if __GNUC__ && POSIX
+#undef __MES_SYS_TYPES_H
 #include_next <sys/types.h>
 #endif // (__GNUC__ && POSIX)
 

mlibc/include/sys/ucontext.h

@@ -21,6 +21,7 @@
 #define __MES_SYS_UCONTEXT_H 1
 
 #if __GNUC__ && POSIX
+#undef __MES_SYS_UCONTEXT_H
 #include_next <sys/ucontext.h>
 #endif // (__GNUC__ && POSIX)
 

mlibc/include/sys/wait.h

@@ -21,6 +21,7 @@
 #define __MES_SYS_WAIT_H 1
 
 #if __GNUC__ && POSIX
+#undef __MES_SYS_WAIT_H
 #include_next <sys/wait.h>
 #endif // (__GNUC__ && POSIX)
 

mlibc/include/time.h

@@ -21,6 +21,7 @@
 #define __MES_TIME_H 1
 
 #if __GNUC__ && POSIX
+#undef __MES_TIME_H
 #include_next <time.h>
 #else // ! (__GNUC__ && POSIX)
 typedef int time_t;

mlibc/include/unistd.h

@@ -24,6 +24,7 @@
 #ifndef _GNU_SOURCE
 #define _GNU_SOURCE
 #endif
+#undef __MES_UNISTD_H
 #include_next <unistd.h>
 
 #else // ! (__GNUC__ && POSIX)