如何在C / C ++文件中通过android ndk检测编译？
是否有一个预处理macros，让我知道ndk编译我的代码？ 我可以手动定义我自己的，但我宁愿不可能。
它是#ifdef __ANDROID__通过运行预处理器看到：
~$ /usr/local/android-ndk-r6/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86/bin/arm-linux-androideabi-gcc -E -dM - < /dev/null | grep -i android
输出是：
#define __ANDROID__ 1
不需要依赖于在你的项目中定义的东西，特别是如果你跳过NDK构build系统。
简短的回答： #ifdef ANDROID 。
ANDROIDmacros在build-module.mk（标准构build系统的一部分）中为您定义：
# always define ANDROID when building binaries # LOCAL_CFLAGS := -DANDROID $(LOCAL_CFLAGS)
这是一个迟到的答案，但为了完整性，这里是包括任何头文件之前的android-eabi的预处理器定义。 一个C ++头文件将带来一大堆额外的头文件。
下面的输出来自Android NDK邮件列表中的在C / C ++源文件（预处理器macros） （大约2013年）中检测Android。 注意__ANDROID__被定义，但不是__android__或ANDROID 。
$ arm-linux-androideabi-cpp -dM < /dev/null | sort #define __ANDROID__ 1 #define __APCS_32__ 1 #define __ARMEL__ 1 #define __ARM_ARCH_5TE__ 1 #define __ARM_EABI__ 1 #define __ARM_FEATURE_DSP 1 #define __ARM_PCS 1 #define __BIGGEST_ALIGNMENT__ 8 #define __BYTE_ORDER__ __ORDER_LITTLE_ENDIAN__ #define __CHAR16_TYPE__ short unsigned int #define __CHAR32_TYPE__ unsigned int #define __CHAR_BIT__ 8 #define __CHAR_UNSIGNED__ 1 #define __DBL_DECIMAL_DIG__ 17 #define __DBL_DENORM_MIN__ ((double)4.9406564584124654e-324L) #define __DBL_DIG__ 15 #define __DBL_EPSILON__ ((double)2.2204460492503131e-16L) #define __DBL_HAS_DENORM__ 1 #define __DBL_HAS_INFINITY__ 1 #define __DBL_HAS_QUIET_NAN__ 1 #define __DBL_MANT_DIG__ 53 #define __DBL_MAX_10_EXP__ 308 #define __DBL_MAX_EXP__ 1024 #define __DBL_MAX__ ((double)1.7976931348623157e+308L) #define __DBL_MIN_10_EXP__ (-307) #define __DBL_MIN_EXP__ (-1021) #define __DBL_MIN__ ((double)2.2250738585072014e-308L) #define __DEC128_EPSILON__ 1E-33DL #define __DEC128_MANT_DIG__ 34 #define __DEC128_MAX_EXP__ 6145 #define __DEC128_MAX__ 9.999999999999999999999999999999999E6144DL #define __DEC128_MIN_EXP__ (-6142) #define __DEC128_MIN__ 1E-6143DL #define __DEC128_SUBNORMAL_MIN__ 0.000000000000000000000000000000001E-6143DL #define __DEC32_EPSILON__ 1E-6DF #define __DEC32_MANT_DIG__ 7 #define __DEC32_MAX_EXP__ 97 #define __DEC32_MAX__ 9.999999E96DF #define __DEC32_MIN_EXP__ (-94) #define __DEC32_MIN__ 1E-95DF #define __DEC32_SUBNORMAL_MIN__ 0.000001E-95DF #define __DEC64_EPSILON__ 1E-15DD #define __DEC64_MANT_DIG__ 16 #define __DEC64_MAX_EXP__ 385 #define __DEC64_MAX__ 9.999999999999999E384DD #define __DEC64_MIN_EXP__ (-382) #define __DEC64_MIN__ 1E-383DD #define __DEC64_SUBNORMAL_MIN__ 0.000000000000001E-383DD #define __DECIMAL_DIG__ 17 #define __DEC_EVAL_METHOD__ 2 #define __ELF__ 1 #define __FINITE_MATH_ONLY__ 0 #define __FLOAT_WORD_ORDER__ __ORDER_LITTLE_ENDIAN__ #define __FLT_DECIMAL_DIG__ 9 #define __FLT_DENORM_MIN__ 1.4012984643248171e-45F #define __FLT_DIG__ 6 #define __FLT_EPSILON__ 1.1920928955078125e-7F #define __FLT_EVAL_METHOD__ 0 #define __FLT_HAS_DENORM__ 1 #define __FLT_HAS_INFINITY__ 1 #define __FLT_HAS_QUIET_NAN__ 1 #define __FLT_MANT_DIG__ 24 #define __FLT_MAX_10_EXP__ 38 #define __FLT_MAX_EXP__ 128 #define __FLT_MAX__ 3.4028234663852886e+38F #define __FLT_MIN_10_EXP__ (-37) #define __FLT_MIN_EXP__ (-125) #define __FLT_MIN__ 1.1754943508222875e-38F #define __FLT_RADIX__ 2 #define __GNUC_GNU_INLINE__ 1 #define __GNUC_MINOR__ 6 #define __GNUC_PATCHLEVEL__ 0 #define __GNUC__ 4 #define __GXX_ABI_VERSION 1002 #define __GXX_TYPEINFO_EQUALITY_INLINE 0 #define __INT16_C(c) c #define __INT16_MAX__ 32767 #define __INT16_TYPE__ short int #define __INT32_C(c) c #define __INT32_MAX__ 2147483647 #define __INT32_TYPE__ int #define __INT64_C(c) c ## LL #define __INT64_MAX__ 9223372036854775807LL #define __INT64_TYPE__ long long int #define __INT8_C(c) c #define __INT8_MAX__ 127 #define __INT8_TYPE__ signed char #define __INTMAX_C(c) c ## LL #define __INTMAX_MAX__ 9223372036854775807LL #define __INTMAX_TYPE__ long long int #define __INTPTR_MAX__ 2147483647 #define __INTPTR_TYPE__ int #define __INT_FAST16_MAX__ 2147483647 #define __INT_FAST16_TYPE__ int #define __INT_FAST32_MAX__ 2147483647 #define __INT_FAST32_TYPE__ int #define __INT_FAST64_MAX__ 9223372036854775807LL #define __INT_FAST64_TYPE__ long long int #define __INT_FAST8_MAX__ 127 #define __INT_FAST8_TYPE__ signed char #define __INT_LEAST16_MAX__ 32767 #define __INT_LEAST16_TYPE__ short int #define __INT_LEAST32_MAX__ 2147483647 #define __INT_LEAST32_TYPE__ int #define __INT_LEAST64_MAX__ 9223372036854775807LL #define __INT_LEAST64_TYPE__ long long int #define __INT_LEAST8_MAX__ 127 #define __INT_LEAST8_TYPE__ signed char #define __INT_MAX__ 2147483647 #define __LDBL_DENORM_MIN__ 4.9406564584124654e-324L #define __LDBL_DIG__ 15 #define __LDBL_EPSILON__ 2.2204460492503131e-16L #define __LDBL_HAS_DENORM__ 1 #define __LDBL_HAS_INFINITY__ 1 #define __LDBL_HAS_QUIET_NAN__ 1 #define __LDBL_MANT_DIG__ 53 #define __LDBL_MAX_10_EXP__ 308 #define __LDBL_MAX_EXP__ 1024 #define __LDBL_MAX__ 1.7976931348623157e+308L #define __LDBL_MIN_10_EXP__ (-307) #define __LDBL_MIN_EXP__ (-1021) #define __LDBL_MIN__ 2.2250738585072014e-308L #define __LONG_LONG_MAX__ 9223372036854775807LL #define __LONG_MAX__ 2147483647L #define __NO_INLINE__ 1 #define __ORDER_BIG_ENDIAN__ 4321 #define __ORDER_LITTLE_ENDIAN__ 1234 #define __ORDER_PDP_ENDIAN__ 3412 #define __PIC__ 1 #define __PRAGMA_REDEFINE_EXTNAME 1 #define __PTRDIFF_MAX__ 2147483647 #define __PTRDIFF_TYPE__ int #define __REGISTER_PREFIX__ #define __SCHAR_MAX__ 127 #define __SHRT_MAX__ 32767 #define __SIG_ATOMIC_MAX__ 2147483647 #define __SIG_ATOMIC_MIN__ (-__SIG_ATOMIC_MAX__ - 1) #define __SIG_ATOMIC_TYPE__ int #define __SIZEOF_DOUBLE__ 8 #define __SIZEOF_FLOAT__ 4 #define __SIZEOF_INT__ 4 #define __SIZEOF_LONG_DOUBLE__ 8 #define __SIZEOF_LONG_LONG__ 8 #define __SIZEOF_LONG__ 4 #define __SIZEOF_POINTER__ 4 #define __SIZEOF_PTRDIFF_T__ 4 #define __SIZEOF_SHORT__ 2 #define __SIZEOF_SIZE_T__ 4 #define __SIZEOF_WCHAR_T__ 4 #define __SIZEOF_WINT_T__ 4 #define __SIZE_MAX__ 4294967295U #define __SIZE_TYPE__ unsigned int #define __SOFTFP__ 1 #define __STDC_HOSTED__ 1 #define __STDC__ 1 #define __THUMB_INTERWORK__ 1 #define __UINT16_C(c) c #define __UINT16_MAX__ 65535 #define __UINT16_TYPE__ short unsigned int #define __UINT32_C(c) c ## U #define __UINT32_MAX__ 4294967295U #define __UINT32_TYPE__ unsigned int #define __UINT64_C(c) c ## ULL #define __UINT64_MAX__ 18446744073709551615ULL #define __UINT64_TYPE__ long long unsigned int #define __UINT8_C(c) c #define __UINT8_MAX__ 255 #define __UINT8_TYPE__ unsigned char #define __UINTMAX_C(c) c ## ULL #define __UINTMAX_MAX__ 18446744073709551615ULL #define __UINTMAX_TYPE__ long long unsigned int #define __UINTPTR_MAX__ 4294967295U #define __UINTPTR_TYPE__ unsigned int #define __UINT_FAST16_MAX__ 4294967295U #define __UINT_FAST16_TYPE__ unsigned int #define __UINT_FAST32_MAX__ 4294967295U #define __UINT_FAST32_TYPE__ unsigned int #define __UINT_FAST64_MAX__ 18446744073709551615ULL #define __UINT_FAST64_TYPE__ long long unsigned int #define __UINT_FAST8_MAX__ 255 #define __UINT_FAST8_TYPE__ unsigned char #define __UINT_LEAST16_MAX__ 65535 #define __UINT_LEAST16_TYPE__ short unsigned int #define __UINT_LEAST32_MAX__ 4294967295U #define __UINT_LEAST32_TYPE__ unsigned int #define __UINT_LEAST64_MAX__ 18446744073709551615ULL #define __UINT_LEAST64_TYPE__ long long unsigned int #define __UINT_LEAST8_MAX__ 255 #define __UINT_LEAST8_TYPE__ unsigned char #define __USER_LABEL_PREFIX__ #define __VERSION__ "4.6 20120106 (prerelease)" #define __VFP_FP__ 1 #define __WCHAR_MAX__ 4294967295U #define __WCHAR_MIN__ 0U #define __WCHAR_TYPE__ unsigned int #define __WINT_MAX__ 4294967295U #define __WINT_MIN__ 0U #define __WINT_TYPE__ unsigned int #define __arm__ 1 #define __linux 1 #define __linux__ 1 #define __pic__ 1 #define __unix 1 #define __unix__ 1 #define linux 1 #define unix 1
