clang (at least in version >= 4), in C++ mode, supports the 'throw ()'
declaration
on functions, and uses it to optimize try/catch statements at the caller site.
2020-08-16 Bruno Haible <br...@clisp.org>
Use 'throw ()' for optimization in C++ mode also on clang.
* lib/cdefs.h (__THROW): Define to 'throw ()' also on clang.
* lib/getopt-cdefs.in.h (__THROW): Likewise.
* lib/md5.h (__THROW): Likewise.
diff --git a/lib/cdefs.h b/lib/cdefs.h
index dfa935f..b7f60c1 100644
--- a/lib/cdefs.h
+++ b/lib/cdefs.h
@@ -85,7 +85,7 @@
# define __NTH(fct) __attribute__ ((__nothrow__ __LEAF)) fct
# define __NTHNL(fct) __attribute__ ((__nothrow__)) fct
# else
-# if defined __cplusplus && __GNUC_PREREQ (2,8)
+# if defined __cplusplus && (__GNUC_PREREQ (2,8) || __clang_major >= 4)
# define __THROW throw ()
# define __THROWNL throw ()
# define __NTH(fct) __LEAF_ATTR fct throw ()
diff --git a/lib/getopt-cdefs.in.h b/lib/getopt-cdefs.in.h
index 89a7b85..641e5e9 100644
--- a/lib/getopt-cdefs.in.h
+++ b/lib/getopt-cdefs.in.h
@@ -57,7 +57,7 @@
#endif
#ifndef __THROW
-# if defined __cplusplus && __GNUC_PREREQ (2,8)
+# if defined __cplusplus && (__GNUC_PREREQ (2,8) || __clang_major__ >= 4)
# define __THROW throw ()
# else
# define __THROW
diff --git a/lib/md5.h b/lib/md5.h
index 0c8b929..4631035 100644
--- a/lib/md5.h
+++ b/lib/md5.h
@@ -40,7 +40,7 @@
#endif
#ifndef __THROW
-# if defined __cplusplus && __GNUC_PREREQ (2,8)
+# if defined __cplusplus && (__GNUC_PREREQ (2,8) || __clang_major__ >= 4)
# define __THROW throw ()
# else
# define __THROW
