From: Joseph Myers <josmyers@redhat.com>
Date: Wed, 3 Sep 2025 16:30:11 +0000 (+0000)
Subject: Fix RISC-V soft-float _FPU_SETCW for GCC 16 set-but-not-used warnings
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=273f80374aeb7d746352a098b23d9bb85e908ea8;p=thirdparty%2Fglibc.git

Fix RISC-V soft-float _FPU_SETCW for GCC 16 set-but-not-used warnings

The soft-float RISC-V definition of _FPU_SETCW results in a
-Werror=unused-but-set-variable= build failure with GCC mainline (in
math/setfpucw.c) because it does not use the dummy cw variable.
Change it to (void) (cw) as on other architectures to avoid this build
failure.

Tested with build-many-glibcs.py (compilers) for
riscv64-linux-gnu-rv64imac-lp64, which previously failed.
Reviewed-by: Sam James <sam@gentoo.org>
---

diff --git a/sysdeps/riscv/fpu_control.h b/sysdeps/riscv/fpu_control.h
index 29cf79f2f6..60ea737169 100644
--- a/sysdeps/riscv/fpu_control.h
+++ b/sysdeps/riscv/fpu_control.h
@@ -27,7 +27,7 @@
 # define _FPU_DEFAULT  0x00000000
 typedef unsigned int fpu_control_t;
 # define _FPU_GETCW(cw) (cw) = 0
-# define _FPU_SETCW(cw) do { } while (0)
+# define _FPU_SETCW(cw) (void) (cw)
 extern fpu_control_t __fpu_control;
 
 #else /* __riscv_flen */