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-rw-r--r--libguile/error.h33
1 files changed, 23 insertions, 10 deletions
diff --git a/libguile/error.h b/libguile/error.h
index 385497e8f..0ce16289a 100644
--- a/libguile/error.h
+++ b/libguile/error.h
@@ -50,21 +50,34 @@ extern int scm_ints_disabled;
+/* GCC can be told that a function doesn't return; this helps it do
+ better error checking (for uninitialized variable use, for
+ example), and some optimization. */
+#ifdef __GNUC__
+#define SCM_NORETURN __attribute__ ((noreturn))
+#else
+#define SCM_NORETURN
+#endif
+
+
extern SCM scm_errno SCM_P ((SCM arg));
extern SCM scm_perror SCM_P ((SCM arg));
extern void scm_error SCM_P ((SCM key, char *subr, char *message,
- SCM args, SCM rest));
+ SCM args, SCM rest)) SCM_NORETURN;
extern void (*scm_error_callback) SCM_P ((SCM key, char *subr,
char *message, SCM args, SCM rest));
-extern void scm_syserror SCM_P ((char *subr));
-extern void scm_syserror_msg SCM_P ((char *subr, char *message, SCM args));
-extern void scm_sysmissing SCM_P ((char *subr));
-extern void scm_num_overflow SCM_P ((char *subr));
-extern void scm_out_of_range SCM_P ((char *subr, SCM bad_value));
-extern void scm_wrong_num_args SCM_P ((SCM proc));
-extern void scm_wrong_type_arg SCM_P ((char *subr, int pos, SCM bad_value));
-extern void scm_memory_error SCM_P ((char *subr));
-extern void scm_misc_error SCM_P ((char *subr, char *message, SCM args));
+extern void scm_syserror SCM_P ((char *subr)) SCM_NORETURN;
+extern void scm_syserror_msg SCM_P ((char *subr, char *message, SCM args))
+ SCM_NORETURN;
+extern void scm_sysmissing SCM_P ((char *subr)) SCM_NORETURN;
+extern void scm_num_overflow SCM_P ((char *subr)) SCM_NORETURN;
+extern void scm_out_of_range SCM_P ((char *subr, SCM bad_value)) SCM_NORETURN;
+extern void scm_wrong_num_args SCM_P ((SCM proc)) SCM_NORETURN;
+extern void scm_wrong_type_arg SCM_P ((char *subr, int pos, SCM bad_value))
+ SCM_NORETURN;
+extern void scm_memory_error SCM_P ((char *subr)) SCM_NORETURN;
+extern void scm_misc_error SCM_P ((char *subr, char *message, SCM args))
+ SCM_NORETURN;
extern SCM scm_wta SCM_P ((SCM arg, char *pos, char *s_subr));
extern void scm_init_error SCM_P ((void));