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nios2: Remove custom instruction warnings

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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.
This commit is contained in:
Sebastian Huber 2021-01-16 09:00:23 +01:00
parent e2559c3945
commit 7e02426ba0
1 changed files with 0 additions and 28 deletions
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28
gcc/config/nios2/nios2.c
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@ -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, "