use an accessor function for __libc data pointer when compiled as PIC

[musl] / src / internal / libc.h

diff --git a/src/internal/libc.h b/src/internal/libc.h
index ea221b6..8a84be0 100644 (file)
--- a/src/internal/libc.h
+++ b/src/internal/libc.h
@@ -4,8 +4,7 @@
 #include <stdlib.h>
 #include <stdio.h>
 
-#define libc __libc
-extern struct libc {
+struct __libc {
        void (*lock)(volatile int *);
        void (*cancelpt)(int);
        int (*atexit)(void (*)(void));
@@ -16,7 +15,15 @@ extern struct libc {
        int (*rsyscall)(int, long, long, long, long, long, long);
        void (**tsd_keys)(void *);
        void (*fork_handler)(int);
-} libc;
+};
+
+#ifdef __PIC__
+extern struct __libc *__libc_loc(void) __attribute__((const));
+#define libc (*__libc_loc())
+#else
+extern struct __libc __libc;
+#define libc __libc
+#endif
 
 
 /* Designed to avoid any overhead in non-threaded processes */