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 Android教程網 >> Android技術 >> Android開發 >> 初級開發 >> Android原生(Native)C開發:查看編譯器

Android原生(Native)C開發:查看編譯器

編輯:初級開發

  • 先定義一個最簡單的C文件(其實任何C文件都可以),只有一行: 
  •       int main(void) {}
    • 在命令行執行如下命令:
          gcc -dM -E test.c
          編譯器會列出所有的預定義宏,如下:
    #define __DBL_MIN_EXP__ (-1021)
    #define __FLT_MIN__ 1.17549435e-38F
    #define _WIN32 1
    #define __CHAR_BIT__ 8
    #define __WCHAR_MAX__ 65535U
    #define __DBL_DENORM_MIN__ 4.9406564584124654e-324
    #define __FLT__METHOD__ 2
    #define __DBL_MIN_10_EXP__ (-307)
    #define __FINITE_MATH_ONLY__ 0
    #define __GNUC_PATCHLEVEL__ 0
    #define _stdcall __attribute__((__stdcall__))
    #define __DEC64_MAX_EXP__ 385
    #define __SHRT_MAX__ 32767
    #define __LDBL_MAX__ 1.18973149535723176502e+4932L
    #define __GXX_TYPEINFO_EQUALITY_INLINE 0
    #define __UINTMAX_TYPE__ long long unsigned int
    #define __DEC32_EPSILON__ 1E-6DF
    #define __LDBL_MAX_EXP__ 16384
    #define __SCHAR_MAX__ 127
    #define __DBL_DIG__ 15
    #define __SIZEOF_INT__ 4
    #define __SIZEOF_POINTER__ 4
    #define __USER_LABEL_PREFIX__ _
    #define __STDC_HOSTED__ 1
    #define __WIN32 1
    #define __LDBL_HAS_INFINITY__ 1
    #define __FLT_EPSILON__ 1.19209290e-7F
    #define __LDBL_MIN__ 3.36210314311209350626e-4932L
    #define __DEC32_MAX__ 9.999999E96DF
    #define __MINGW32__ 1
    。。。 當然,你也可以換成你想查看的編譯器,如android的編譯器:   arm-eabi-gcc -dM -E test.c
    則android的Toolchain編譯器的所有預定義宏顯示如下:
    #define __DBL_MIN_EXP__ (-1021)
    #define __FLT_MIN__ 1.17549435e-38F
    #define __DEC64_DEN__ 0.000000000000001E-383DD
    #define __CHAR_BIT__ 8
    #define __WCHAR_MAX__ 4294967295U
    #define __DBL_DENORM_MIN__ 4.9406564584124654e-324
    #define __FLT__METHOD__ 0
    #define __DBL_MIN_10_EXP__ (-307)
    #define __FINITE_MATH_ONLY__ 0
    #define __ARMEL__ 1
    #define __GNUC_PATCHLEVEL__ 1
    #define __DEC64_MAX_EXP__ 384
    #define __SHRT_MAX__ 32767
    #define __LDBL_MAX__ 1.7976931348623157e+308L
    #define __UINTMAX_TYPE__ long long unsigned int
    #define __DEC32_EPSILON__ 1E-6DF
    #define __CHAR_UNSIGNED__ 1
    #define __LDBL_MAX_EXP__ 1024
    #define __SCHAR_MAX__ 127
    #define __DBL_DIG__ 15
    #define __USER_LABEL_PREFIX__
    #define __STDC_HOSTED__ 1
    #define __LDBL_HAS_INFINITY__ 1
    #define __FLT_EPSILON__ 1.19209290e-7F
    #define __APCS_32__ 1
    #define __LDBL_MIN__ 2.2250738585072014e-308L
    #define __DEC32_MAX__ 9.999999E96DF
    #define __DECIMAL_DIG__ 17
    #define __LDBL_HAS_QUIET_NAN__ 1
    #define __GNUC__ 4
    #define __FLT_HAS_DENORM__ 1
    #define __DBL_MAX__ 1.7976931348623157e+308
    #define __DBL_HAS_INFINITY__ 1
    #define __DEC32_MIN_EXP__ (-95)
    #define __THUMB_INTERWORK__ 1
    #define __LDBL_HAS_DENORM__ 1
    #define __DEC128_MAX__ 9.999999999999999999999999999999999E6144DL
    #define __DEC32_MIN__ 1E-95DF
    #define __DBL_MAX_EXP__ 1024
    #define __DEC128_EPSILON__ 1E-33DL
    #define __LONG_LONG_MAX__ 9223372036854775807LL
    #define __GXX_ABI_VERSION 1002
    #define __SOFTFP__ 1
    #define __FLT_MIN_EXP__ (-125)
    #define __DBL_MIN__ 2.2250738585072014e-308
    #define __USES_INITFINI__ 1
    #define __DEC128_MIN__ 1E-6143DL
    #define __REGISTER_PREFIX__
    #define __DBL_HAS_DENORM__ 1
    #define __NO_INLINE__ 1
    #define __FLT_MANT_DIG__ 24
    #define __VERSION__ "4.2.1"
    #define __DEC64_EPSILON__ 1E-15DD
    #define __DEC128_MIN_EXP__ (-6143)
    #define __SIZE_TYPE__ unsigned int
    #define __DEC32_DEN__ 0.000001E-95DF
    #define __ELF__ 1
    #define __FLT_RADIX__ 2
    #define __LDBL_EPSILON__ 2.2204460492503131e-16L
    #define __VFP_FP__ 1
    #define __FLT_HAS_QUIET_NAN__ 1
    #define __FLT_MAX_10_EXP__ 38
    #define __LONG_MAX__ 2147483647L
    #define __FLT_HAS_INFINITY__ 1
    #define __DEC64_MAX__ 9.999999999999999E384DD
    #define __DEC64_MANT_DIG__ 16
    #define __DEC32_MAX_EXP__ 96
    #define __DEC128_DEN__ 0.000000000000000000000000000000001E-6143DL
    #define __GXX_MERGED_TYPEINFO_NAMES 0
    #define __LDBL_MANT_DIG__ 53
    #define __DBL_HAS_QUIET_NAN__ 1
    #define __WCHAR_TYPE__ unsigned int
    #define __DEC64_MIN_EXP__ (-383)
    #define __FLT_DIG__ 6
    #define __INT_MAX__ 2147483647
    #define __FLT_MAX_EXP__ 128
    #define __DBL_MANT_DIG__ 53
    #define __DEC64_MIN__ 1E-383DD
    #define __WINT_TYPE__ unsigned int
    #define __LDBL_MIN_EXP__ (-1021)
    #define __arm__ 1
    #define __LDBL_MAX_10_EXP__ 308
    #define __DBL_EPSILON__ 2.2204460492503131e-16
    #define __DEC__METHOD__ 2
    #define __INTMAX_MAX__ 9223372036854775807LL
    #define __FLT_DENORM_MIN__ 1.40129846e-45F
    #define __FLT_MAX__ 3.40282347e+38F
    #define __FLT_MIN_10_EXP__ (-37)
    #define __INTMAX_TYPE__ long long int
    #define __DEC128_MAX_EXP__ 6144
    #define __GNUC_MINOR__ 2
    #define __DEC32_MANT_DIG__ 7
    #define __DBL_MAX_10_EXP__ 308
    #define __LDBL_DENORM_MIN__ 4.9406564584124654e-324L
    #define __STDC__ 1
    #define __ARM_ARCH_4T__ 1
    #define __PTRDIFF_TYPE__ int
    #define __ARM_EABI__ 1
    #define __DEC128_MANT_DIG__ 34
    #define __LDBL_MIN_10_EXP__ (-307)
    #define __LDBL_DIG__ 15
    #define __GNUC_GNU_INLINE__ 1
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