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Diffstat (limited to 'include/features.h')
-rw-r--r--include/features.h23
1 files changed, 17 insertions, 6 deletions
diff --git a/include/features.h b/include/features.h
index 54330dae9..af64066d9 100644
--- a/include/features.h
+++ b/include/features.h
@@ -45,6 +45,10 @@
# define __restrict /* Ignore */
#endif
+/* __extension__ is known in gcc 2.8 above. */
+#if !defined __GNUC__ || __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8)
+# define __extension__ /* Ignore */
+#endif
#ifdef __STDC__
@@ -105,13 +109,20 @@
#undef __need_uClibc_config_h
-#if 1 /* This only works with GNU ld, but that is what we use 'round these parts */
-#define link_warning(symbol, msg) \
-asm (".section " ".gnu.warning." #symbol "\n\t.previous"); \
-static const char __evoke_link_warning_##symbol[] \
-__attribute__ ((section (".gnu.warning." #symbol "\n\t#"))) = msg;
+/* Some nice features only work properly with ELF */
+#if defined HAVE_ELF
+# define link_warning(symbol, msg) \
+ asm (".section " ".gnu.warning." #symbol "\n\t.previous"); \
+ static const char __evoke_link_warning_##symbol[] \
+ __attribute__ ((section (".gnu.warning." #symbol "\n\t#"))) = msg;
+# define weak_alias(name, aliasname) \
+ extern __typeof (name) aliasname __attribute__ ((weak, alias (#name)));
#else
-# define link_warning(symbol, msg)
+# define link_warning(symbol, msg) \
+ asm (".stabs \"" msg "\",30,0,0,0\n\t" \
+ ".stabs \"" #symbol "\",1,0,0,0\n");
+# define weak_alias(name, aliasname) \
+ __asm__(".global alias\n.set alias,original");
#endif