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7.2.4 Features for dg-add-options

The supported values of feature for directive dg-add-options are:

arm_fp
__ARM_FP definition. Only ARM targets support this feature, and only then in certain modes; see the arm_fp_ok effective target keyword.
arm_neon
NEON support. Only ARM targets support this feature, and only then in certain modes; see the arm_neon_ok effective target keyword.
arm_fp16
VFP half-precision floating point support. This does not select the FP16 format; for that, use arm_fp16_ieee or arm_fp16_alternative instead. This feature is only supported by ARM targets and then only in certain modes; see the arm_fp16_ok effective target keyword.
arm_fp16_ieee
ARM IEEE 754-2008 format VFP half-precision floating point support. This feature is only supported by ARM targets and then only in certain modes; see the arm_fp16_ok effective target keyword.
arm_fp16_alternative
ARM Alternative format VFP half-precision floating point support. This feature is only supported by ARM targets and then only in certain modes; see the arm_fp16_ok effective target keyword.
arm_neon_fp16
NEON and half-precision floating point support. Only ARM targets support this feature, and only then in certain modes; see the arm_neon_fp16_ok effective target keyword.
arm_vfp3
arm vfp3 floating point support; see the arm_vfp3_ok effective target keyword.
arm_v8_1a_neon
Add options for ARMv8.1 with Adv.SIMD support, if this is supported by the target; see the arm_v8_1a_neon_ok effective target keyword.
arm_v8_2a_fp16_scalar
Add options for ARMv8.2 with scalar FP16 support, if this is supported by the target; see the arm_v8_2a_fp16_scalar_ok effective target keyword.
arm_v8_2a_fp16_neon
Add options for ARMv8.2 with Adv.SIMD FP16 support, if this is supported by the target; see the arm_v8_2a_fp16_neon_ok effective target keyword.
bind_pic_locally
Add the target-specific flags needed to enable functions to bind locally when using pic/PIC passes in the testsuite.
c99_runtime
Add the target-specific flags needed to access the C99 runtime.
floatn
Add the target-specific flags needed to use the _Floatn type.
floatnx
Add the target-specific flags needed to use the _Floatnx type.
ieee
Add the target-specific flags needed to enable full IEEE compliance mode.
mips16_attribute
mips16 function attributes. Only MIPS targets support this feature, and only then in certain modes.
tls
Add the target-specific flags needed to use thread-local storage.