GNU Compiler Collection (GCC) Internals: Add Options

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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.

`arm_v8_2a_dotprod_neon`

  Add options for ARMv8.2 with Adv.SIMD Dot Product support, if this is supported by the target; see the arm_v8_2a_dotprod_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.

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