[glibc/azanella/clang] riscv: Do not use cfi_label when building with clang

[Adhemerval Zanella <azanella@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=f2c1c4e8cc6b7652f0c8711328b18c0430da983b

commit f2c1c4e8cc6b7652f0c8711328b18c0430da983b
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date:   Thu Sep 28 14:17:54 2023 -0300

    riscv: Do not use cfi_label when building with clang
    
    The .cfi_label is a gas extension not supported by clang.  From a
    ziglang discussion [1], it seems that it is not really required.
    
    [1] https://github.com/ziglang/zig/issues/3340

Diff:
---
 sysdeps/generic/sysdep.h               | 6 ++++++
 sysdeps/riscv/start.S                  | 2 +-
 sysdeps/unix/sysv/linux/riscv/clone.S  | 2 +-
 sysdeps/unix/sysv/linux/riscv/clone3.S | 2 +-
 4 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/sysdeps/generic/sysdep.h b/sysdeps/generic/sysdep.h
index c47e53d3d8..c663912b8e 100644
--- a/sysdeps/generic/sysdep.h
+++ b/sysdeps/generic/sysdep.h
@@ -55,6 +55,12 @@
 # define cfi_window_save		.cfi_window_save
 # define cfi_personality(enc, exp)	.cfi_personality enc, exp
 # define cfi_lsda(enc, exp)		.cfi_lsda enc, exp
+/* .cfi_label is a gas extension not supported by clang.  */
+# ifndef __clang__
+#  define cfi_label(label)		.cfi_label label
+# else
+#  define cfi_label(label)
+# endif
 
 #else /* ! ASSEMBLER */
 
diff --git a/sysdeps/riscv/start.S b/sysdeps/riscv/start.S
index ede186ef23..bff535be9d 100644
--- a/sysdeps/riscv/start.S
+++ b/sysdeps/riscv/start.S
@@ -45,7 +45,7 @@
 ENTRY (ENTRY_POINT)
 	/* Terminate call stack by noting ra is undefined.  Use a dummy
 	   .cfi_label to force starting the FDE.  */
-	.cfi_label .Ldummy
+	cfi_label (.Ldummy)
 	cfi_undefined (ra)
 	call  load_gp
 	mv    a5, a0  /* rtld_fini.  */
diff --git a/sysdeps/unix/sysv/linux/riscv/clone.S b/sysdeps/unix/sysv/linux/riscv/clone.S
index b9c843eb1d..f815fd6160 100644
--- a/sysdeps/unix/sysv/linux/riscv/clone.S
+++ b/sysdeps/unix/sysv/linux/riscv/clone.S
@@ -74,7 +74,7 @@ ENTRY (__thread_start)
 L (thread_start):
 	/* Terminate call stack by noting ra is undefined.  Use a dummy
 	   .cfi_label to force starting the FDE.  */
-	.cfi_label .Ldummy
+	cfi_label (.Ldummy)
 	cfi_undefined (ra)
 
 	/* Restore the arg for user's function.  */
diff --git a/sysdeps/unix/sysv/linux/riscv/clone3.S b/sysdeps/unix/sysv/linux/riscv/clone3.S
index 29264be054..6a81a56519 100644
--- a/sysdeps/unix/sysv/linux/riscv/clone3.S
+++ b/sysdeps/unix/sysv/linux/riscv/clone3.S
@@ -62,7 +62,7 @@ ENTRY(__thread_start_clone3)
 L(thread_start):
 	/* Terminate call stack by noting ra is undefined.  Use a dummy
 	   .cfi_label to force starting the FDE.  */
-	.cfi_label .Ldummy
+	cfi_label (.Ldummy)
 	cfi_undefined (ra)
 
 	/* Restore the arg for user's function and call the user's