Do not warn if custom instructions are not used due to missing
optimization flags. This prevents build errors with -Werror which
cannot be disabled via a dedicated warning option.
One reason to remove these warnings is to enable a multilib for the
"Nios II Floating Point Hardware 2 Component". For example, the
libatomic target library in GCC is built with -Werror and the warnings
removed by this patch resulted in errors like:
cc1: error: switch '-mcustom-fmins' has no effect unless '-ffinite-math-only'
is specified [-Werror]
cc1: error: switch '-mcustom-fmaxs' has no effect unless '-ffinite-math-only'
is specified [-Werror]
cc1: error: switch '-mcustom-round' has no effect unless '-fno-math-errno' is
specified [-Werror]
gcc/
* config/nios2/nios2.c (nios2_custom_check_insns): Remove
custom instruction warnings.
---
gcc/config/nios2/nios2.c | 28 ----------------------------
1 file changed, 28 deletions(-)
diff --git a/gcc/config/nios2/nios2.c b/gcc/config/nios2/nios2.c
index 3bffabe9856..e4349e766ae 100644
--- a/gcc/config/nios2/nios2.c
+++ b/gcc/config/nios2/nios2.c
@@ -1186,34 +1186,6 @@ nios2_custom_check_insns (void)
break;
}
- /* Warn if the user has certain exotic operations that won't get used
- without -funsafe-math-optimizations. See expand_builtin () in
- builtins.c. */
- if (!flag_unsafe_math_optimizations)
- for (i = 0; i < ARRAY_SIZE (nios2_fpu_insn); i++)
- if (N2FPU_ENABLED_P (i) && N2FPU_UNSAFE_P (i))
- warning (0, "switch %<-mcustom-%s%> has no effect unless "
- "%<-funsafe-math-optimizations%> is specified",
- N2FPU_NAME (i));
-
- /* Warn if the user is trying to use -mcustom-fmins et. al, that won't
- get used without -ffinite-math-only. See fold_builtin_fmin_fmax ()
- in builtins.c. */
- if (!flag_finite_math_only)
- for (i = 0; i < ARRAY_SIZE (nios2_fpu_insn); i++)
- if (N2FPU_ENABLED_P (i) && N2FPU_FINITE_P (i))
- warning (0, "switch %<-mcustom-%s%> has no effect unless "
- "%<-ffinite-math-only%> is specified", N2FPU_NAME (i));
-
- /* Warn if the user is trying to use a custom rounding instruction
- that won't get used without -fno-math-errno. See
- expand_builtin_int_roundingfn_2 () in builtins.c. */
- if (flag_errno_math)
- for (i = 0; i < ARRAY_SIZE (nios2_fpu_insn); i++)
- if (N2FPU_ENABLED_P (i) && N2FPU_NO_ERRNO_P (i))
- warning (0, "switch %<-mcustom-%s%> has no effect unless "
- "%<-fno-math-errno%> is specified", N2FPU_NAME (i));
-
if (errors || custom_code_conflict)
fatal_error (input_location,
"conflicting use of %<-mcustom%> switches, target attributes, "
--
2.26.2
