Merge branch 'cpp-extern' into 'master'

Disable symbol mangling for C++

See merge request redox-os/relibc!173

include/bits/errno.h

@@ -1,7 +1,15 @@
 #ifndef _BITS_ERRNO_H
 #define _BITS_ERRNO_H
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 //TODO extern __thread int errno;
 extern int errno;
 
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
 #endif /* _BITS_ERRNO_H */

include/bits/fcntl.h

@@ -1,7 +1,15 @@
 #ifndef _BITS_FCNTL_H
 #define _BITS_FCNTL_H
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 int open(const char* filename, int flags, ...);
 int fcntl(int fildes, int cmd, ...);
 
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
 #endif

include/bits/stdio.h

@@ -5,6 +5,10 @@
 
 typedef struct FILE FILE;
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 int fprintf(FILE * stream, const char * fmt, ...);
 int printf(const char * fmt, ...);
 int snprintf(char *s, size_t n, const char * fmt, ...);
@@ -13,4 +17,8 @@ int fscanf(FILE * stream, const char * fmt, ...);
 int scanf(const char * fmt, ...);
 int sscanf(const char * input, const char * fmt, ...);
 
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
 #endif /* _BITS_STDIO_H */

include/bits/unistd.h

@@ -3,7 +3,15 @@
 
 #define _POSIX_VERSION 200809L
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 int execl(const char *path, const char* argv0, ...);
 int execle(const char *path, const char* argv0, ...);
 
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
 #endif