Allow building simulators on systems where errno is thread-local by using the system's implementation of errno.h for simulator builds.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@8871 a1c6a512-1295-4272-9138-f99709370657

apps/tagdb/parser.c

@@ -1,11 +1,10 @@
 #include <stdio.h>
 #include <stdint.h>
 #include <stdlib.h>
+#include <errno.h>
 
 #include "config.h"
 
-int errno;
-
 int read_failure(FILE *fd) {
 	fprintf(stderr, "Could not read from file: errno: %u ", errno);
 	if( feof(fd) ) fprintf(stderr, "EOF");

firmware/SOURCES

@@ -14,7 +14,9 @@ common/file.c
 common/dircache.c
 #endif
 common/disk.c
+#if !defined(SIMULATOR) || defined(__MINGW32__) || defined(__CYGWIN__)
 common/errno.c
+#endif
 common/memcmp.c
 common/memchr.c
 common/qsort.c

firmware/include/errno.h

@@ -1,6 +1,12 @@
 /* errno is not a global variable, because that would make using it
    non-reentrant.  Instead, its address is returned by the function
    __errno.  */
+   
+#if defined(SIMULATOR) && !defined(__MINGW32__) && !defined(__CYGWIN__)
+
+#include "/usr/include/errno.h"  /* use the host system implementation */
+
+#else             /* use our own implementation */
 
 #ifndef _SYS_ERRNO_H_
 
@@ -132,3 +138,4 @@ extern int errno;
 #define __ELASTERROR 2000	/* Users can add values starting here */
 
 #endif /* _SYS_ERRNO_H */
+#endif /* !SIMULATOR */

uisimulator/sdl/kernel.c

@@ -24,11 +24,6 @@
 #include "thread.h"
 #include "debug.h"
 
-/* (Daniel 2002-10-31) Mingw32 requires this errno variable to be present.
-   I'm not quite sure why and I don't know if this breaks the MSVC compile.
-   If it does, we should put this within #ifdef __MINGW32__ */
-int errno;
-
 static void (*tick_funcs[MAX_NUM_TICK_TASKS])(void);
 
 int set_irq_level (int level)

uisimulator/win32/kernel.c

@@ -24,11 +24,6 @@
 #include "thread.h"
 #include "debug.h"
 
-/* (Daniel 2002-10-31) Mingw32 requires this errno variable to be present.
-   I'm not quite sure why and I don't know if this breaks the MSVC compile.
-   If it does, we should put this within #ifdef __MINGW32__ */
-int errno;
-
 static void (*tick_funcs[MAX_NUM_TICK_TASKS])(void);
 
 int set_irq_level (int level)