2015-08-28 86 views
1

我想添加一个基于Linux发行版的宏,例如Ubuntu 15与Ubuntu 14LTS。因此,对于__linux的IFDEF内我会执行检查:确定Linux发行版的宏

#ifdef __linux 
    // find version 
#endif 

有一个聪明的办法来做到这一点?感谢您的任何想法

+1

那么,你为什么要这样做呢?您是否想知道系统中是否有某些资源可用/采取不同的方式来避免错误?通常,这种事情是构建配置的一部分,就像在一些cmake/scons/autotools脚本中一样,然后将定义传递给修改适当行为的程序。 Andrejs Cainikovs也提出了一个很好的问题,你真的想在编译时或运行时找到这个信息吗?我假设你想要编译时间,因为你说宏,但运行时可能更有用,因为它告诉你哪些资源可用? –

+0

我正在添加依赖于Linux发行版(systemd)的功能。我目前正在运行时执行这些检查,但是希望通过宏在生成时刻烘烤它们,因为目标平台的配置是众所周知的(嵌入式设备),但开发人员工作站可能是任何东西 – Hoofamon

+0

因此,我认为我会建议是让你的代码响应'#ifdef WITH_SYSTEMD'这样的定义,然后让你的构建系统在适当的时候添加定义。然后你可以让构建系统负责设置该标志,并且人们可以为Debian,Ubuntu,Arch等定制它,或者轻松覆盖它,而无需修改源代码。 –

回答

2

我只是写一些外部的C++来为您定义宏。我在Boost.Predef中没有看到任何东西,它不仅仅给你提供任何东西。喜欢的东西:

linux_defines() { 
    if -f /etc/redhat-release; then 
     awk '{ 
      printf("-D__rhel_ver__=%d\n",$7 * 100) 
     }' /etc/redhat-release 
    elif -f /etc/lsb-release; then 
     awk -F= '$1 == "DISTRIB_RELEASE"{ 
      printf("-D__ubuntu_ver__=%d\n",$2 * 100) 
     }' /etc/lsb-release 
    elif ... 
     ... 
    fi 
} 

而且在Makefile坚持一个呼叫,以延长您CPPFLAGS(或CXXFLAGS或......)

+0

感谢您的想法,我会给这个镜头 – Hoofamon

1

我能想到的,做你想要什么最接近的事是,如果你能以某种方式找到一个预处理器定义包含的gcc -v内容,其中包括例如

$ gcc -v 
Using built-in specs. 
COLLECT_GCC=gcc 
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.8/lto-wrapper 
Target: x86_64-linux-gnu 
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 4.8.4-2ubuntu1~14.04' --with-bugurl=file:///usr/share/doc/gcc-4.8/README.Bugs --enable-languages=c,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-4.8 --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.8 --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-gnu-unique-object --disable-libmudflap --enable-plugin --with-system-zlib --disable-browser-plugin --enable-java-awt=gtk --enable-gtk-cairo --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-4.8-amd64/jre --enable-java-home --with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-4.8-amd64 --with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-4.8-amd64 --with-arch-directory=amd64 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --enable-objc-gc --enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --with-tune=generic --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu 
Thread model: posix 
gcc version 4.8.4 (Ubuntu 4.8.4-2ubuntu1~14.04) 

__VERSION__实际上并不包含你想可惜的信息。这里

展望https://gcc.gnu.org/onlinedocs/cpp/System-specific-Predefined-Macros.html#System-specific-Predefined-Macros,事实证明,你可以列出所有提供的定义与cpp -dM,这对我来说,得到:

$ cpp -dM 

#define __DBL_MIN_EXP__ (-1021) 
#define __UINT_LEAST16_MAX__ 65535 
#define __ATOMIC_ACQUIRE 2 
#define __FLT_MIN__ 1.17549435082228750797e-38F 
#define __UINT_LEAST8_TYPE__ unsigned char 
#define __INTMAX_C(c) C## L 
#define __CHAR_BIT__ 8 
#define __UINT8_MAX__ 255 
#define __WINT_MAX__ 4294967295U 
#define __ORDER_LITTLE_ENDIAN__ 1234 
#define __SIZE_MAX__ 18446744073709551615UL 
#define __WCHAR_MAX__ 2147483647 
#define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_1 1 
#define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_2 1 
#define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4 1 
#define __DBL_DENORM_MIN__ ((double)4.94065645841246544177e-324L) 
#define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_8 1 
#define __GCC_ATOMIC_CHAR_LOCK_FREE 2 
#define __FLT_EVAL_METHOD__ 0 
#define __unix__ 1 
#define __GCC_ATOMIC_CHAR32_T_LOCK_FREE 2 
#define __x86_64 1 
#define __UINT_FAST64_MAX__ 18446744073709551615UL 
#define __SIG_ATOMIC_TYPE__ int 
#define __DBL_MIN_10_EXP__ (-307) 
#define __FINITE_MATH_ONLY__ 0 
#define __GNUC_PATCHLEVEL__ 4 
#define __UINT_FAST8_MAX__ 255 
#define __DEC64_MAX_EXP__ 385 
#define __INT8_C(c) c 
#define __UINT_LEAST64_MAX__ 18446744073709551615UL 
#define __SHRT_MAX__ 32767 
#define __LDBL_MAX__ 1.18973149535723176502e+4932L 
#define __UINT_LEAST8_MAX__ 255 
#define __GCC_ATOMIC_BOOL_LOCK_FREE 2 
#define __UINTMAX_TYPE__ long unsigned int 
#define __linux 1 
#define __DEC32_EPSILON__ 1E-6DF 
#define __unix 1 
#define __UINT32_MAX__ 4294967295U 
#define __LDBL_MAX_EXP__ 16384 
#define __WINT_MIN__ 0U 
#define __linux__ 1 
#define __SCHAR_MAX__ 127 
#define __WCHAR_MIN__ (-__WCHAR_MAX__ - 1) 
#define __INT64_C(c) C## L 
#define __DBL_DIG__ 15 
#define __GCC_ATOMIC_POINTER_LOCK_FREE 2 
#define __SIZEOF_INT__ 4 
#define __SIZEOF_POINTER__ 8 
#define __USER_LABEL_PREFIX__ 
#define __STDC_HOSTED__ 1 
#define __LDBL_HAS_INFINITY__ 1 
#define __FLT_EPSILON__ 1.19209289550781250000e-7F 
#define __LDBL_MIN__ 3.36210314311209350626e-4932L 
#define __DEC32_MAX__ 9.999999E96DF 
#define __INT32_MAX__ 2147483647 
#define __SIZEOF_LONG__ 8 
#define __STDC_IEC_559__ 1 
#define __STDC_ISO_10646__ 201103L 
#define __UINT16_C(c) c 
#define __DECIMAL_DIG__ 21 
#define __gnu_linux__ 1 
#define __LDBL_HAS_QUIET_NAN__ 1 
#define __GNUC__ 4 
#define __MMX__ 1 
#define __FLT_HAS_DENORM__ 1 
#define __SIZEOF_LONG_DOUBLE__ 16 
#define __BIGGEST_ALIGNMENT__ 16 
#define __DBL_MAX__ ((double)1.79769313486231570815e+308L) 
#define __INT_FAST32_MAX__ 9223372036854775807L 
#define __DBL_HAS_INFINITY__ 1 
#define __DEC32_MIN_EXP__ (-94) 
#define __INT_FAST16_TYPE__ long int 
#define __LDBL_HAS_DENORM__ 1 
#define __DEC128_MAX__ 9.999999999999999999999999999999999E6144DL 
#define __INT_LEAST32_MAX__ 2147483647 
#define __DEC32_MIN__ 1E-95DF 
#define __DBL_MAX_EXP__ 1024 
#define __DEC128_EPSILON__ 1E-33DL 
#define __SSE2_MATH__ 1 
#define __ATOMIC_HLE_RELEASE 131072 
#define __PTRDIFF_MAX__ 9223372036854775807L 
#define __amd64 1 
#define __STDC_NO_THREADS__ 1 
#define __ATOMIC_HLE_ACQUIRE 65536 
#define __LONG_LONG_MAX__ 9223372036854775807LL 
#define __SIZEOF_SIZE_T__ 8 
#define __SIZEOF_WINT_T__ 4 
#define __GCC_HAVE_DWARF2_CFI_ASM 1 
#define __GXX_ABI_VERSION 1002 
#define __FLT_MIN_EXP__ (-125) 
#define __INT_FAST64_TYPE__ long int 
#define __DBL_MIN__ ((double)2.22507385850720138309e-308L) 
#define __LP64__ 1 
#define __DECIMAL_BID_FORMAT__ 1 
#define __DEC128_MIN__ 1E-6143DL 
#define __REGISTER_PREFIX__ 
#define __UINT16_MAX__ 65535 
#define __DBL_HAS_DENORM__ 1 
#define __UINT8_TYPE__ unsigned char 
#define __NO_INLINE__ 1 
#define __FLT_MANT_DIG__ 24 
#define __VERSION__ "4.8.4" 
#define __UINT64_C(c) C## UL 
#define _STDC_PREDEF_H 1 
#define __GCC_ATOMIC_INT_LOCK_FREE 2 
#define __FLOAT_WORD_ORDER__ __ORDER_LITTLE_ENDIAN__ 
#define __STDC_IEC_559_COMPLEX__ 1 
#define __INT32_C(c) c 
#define __DEC64_EPSILON__ 1E-15DD 
#define __ORDER_PDP_ENDIAN__ 3412 
#define __DEC128_MIN_EXP__ (-6142) 
#define __INT_FAST32_TYPE__ long int 
#define __UINT_LEAST16_TYPE__ short unsigned int 
#define unix 1 
#define __INT16_MAX__ 32767 
#define __SIZE_TYPE__ long unsigned int 
#define __UINT64_MAX__ 18446744073709551615UL 
#define __INT8_TYPE__ signed char 
#define __ELF__ 1 
#define __FLT_RADIX__ 2 
#define __INT_LEAST16_TYPE__ short int 
#define __LDBL_EPSILON__ 1.08420217248550443401e-19L 
#define __UINTMAX_C(c) C## UL 
#define __SSE_MATH__ 1 
#define __k8 1 
#define __SIG_ATOMIC_MAX__ 2147483647 
#define __GCC_ATOMIC_WCHAR_T_LOCK_FREE 2 
#define __SIZEOF_PTRDIFF_T__ 8 
#define __x86_64__ 1 
#define __DEC32_SUBNORMAL_MIN__ 0.000001E-95DF 
#define __INT_FAST16_MAX__ 9223372036854775807L 
#define __UINT_FAST32_MAX__ 18446744073709551615UL 
#define __UINT_LEAST64_TYPE__ long unsigned int 
#define __FLT_HAS_QUIET_NAN__ 1 
#define __FLT_MAX_10_EXP__ 38 
#define __LONG_MAX__ 9223372036854775807L 
#define __DEC128_SUBNORMAL_MIN__ 0.000000000000000000000000000000001E-6143DL 
#define __FLT_HAS_INFINITY__ 1 
#define __UINT_FAST16_TYPE__ long unsigned int 
#define __DEC64_MAX__ 9.999999999999999E384DD 
#define __CHAR16_TYPE__ short unsigned int 
#define __PRAGMA_REDEFINE_EXTNAME 1 
#define __INT_LEAST16_MAX__ 32767 
#define __DEC64_MANT_DIG__ 16 
#define __INT64_MAX__ 9223372036854775807L 
#define __UINT_LEAST32_MAX__ 4294967295U 
#define __GCC_ATOMIC_LONG_LOCK_FREE 2 
#define __INT_LEAST64_TYPE__ long int 
#define __INT16_TYPE__ short int 
#define __INT_LEAST8_TYPE__ signed char 
#define __DEC32_MAX_EXP__ 97 
#define __INT_FAST8_MAX__ 127 
#define __INTPTR_MAX__ 9223372036854775807L 
#define linux 1 
#define __SSE2__ 1 
#define __LDBL_MANT_DIG__ 64 
#define __DBL_HAS_QUIET_NAN__ 1 
#define __SIG_ATOMIC_MIN__ (-__SIG_ATOMIC_MAX__ - 1) 
#define __code_model_small__ 1 
#define __k8__ 1 
#define __INTPTR_TYPE__ long int 
#define __UINT16_TYPE__ short unsigned int 
#define __WCHAR_TYPE__ int 
#define __SIZEOF_FLOAT__ 4 
#define __UINTPTR_MAX__ 18446744073709551615UL 
#define __DEC64_MIN_EXP__ (-382) 
#define __INT_FAST64_MAX__ 9223372036854775807L 
#define __GCC_ATOMIC_TEST_AND_SET_TRUEVAL 1 
#define __FLT_DIG__ 6 
#define __UINT_FAST64_TYPE__ long unsigned int 
#define __INT_MAX__ 2147483647 
#define __amd64__ 1 
#define __INT64_TYPE__ long int 
#define __FLT_MAX_EXP__ 128 
#define __ORDER_BIG_ENDIAN__ 4321 
#define __DBL_MANT_DIG__ 53 
#define __INT_LEAST64_MAX__ 9223372036854775807L 
#define __GCC_ATOMIC_CHAR16_T_LOCK_FREE 2 
#define __DEC64_MIN__ 1E-383DD 
#define __WINT_TYPE__ unsigned int 
#define __UINT_LEAST32_TYPE__ unsigned int 
#define __SIZEOF_SHORT__ 2 
#define __SSE__ 1 
#define __LDBL_MIN_EXP__ (-16381) 
#define __INT_LEAST8_MAX__ 127 
#define __SSP__ 1 
#define __SIZEOF_INT128__ 16 
#define __LDBL_MAX_10_EXP__ 4932 
#define __ATOMIC_RELAXED 0 
#define __DBL_EPSILON__ ((double)2.22044604925031308085e-16L) 
#define _LP64 1 
#define __UINT8_C(c) c 
#define __INT_LEAST32_TYPE__ int 
#define __SIZEOF_WCHAR_T__ 4 
#define __UINT64_TYPE__ long unsigned int 
#define __INT_FAST8_TYPE__ signed char 
#define __DBL_DECIMAL_DIG__ 17 
#define __FXSR__ 1 
#define __DEC_EVAL_METHOD__ 2 
#define __UINT32_C(c) C## U 
#define __INTMAX_MAX__ 9223372036854775807L 
#define __BYTE_ORDER__ __ORDER_LITTLE_ENDIAN__ 
#define __FLT_DENORM_MIN__ 1.40129846432481707092e-45F 
#define __INT8_MAX__ 127 
#define __UINT_FAST32_TYPE__ long unsigned int 
#define __CHAR32_TYPE__ unsigned int 
#define __FLT_MAX__ 3.40282346638528859812e+38F 
#define __INT32_TYPE__ int 
#define __SIZEOF_DOUBLE__ 8 
#define __FLT_MIN_10_EXP__ (-37) 
#define __INTMAX_TYPE__ long int 
#define __DEC128_MAX_EXP__ 6145 
#define __ATOMIC_CONSUME 1 
#define __GNUC_MINOR__ 8 
#define __UINTMAX_MAX__ 18446744073709551615UL 
#define __DEC32_MANT_DIG__ 7 
#define __DBL_MAX_10_EXP__ 308 
#define __LDBL_DENORM_MIN__ 3.64519953188247460253e-4951L 
#define __INT16_C(c) c 
#define __STDC__ 1 
#define __PTRDIFF_TYPE__ long int 
#define __ATOMIC_SEQ_CST 5 
#define __UINT32_TYPE__ unsigned int 
#define __UINTPTR_TYPE__ long unsigned int 
#define __DEC64_SUBNORMAL_MIN__ 0.000000000000001E-383DD 
#define __DEC128_MANT_DIG__ 34 
#define __LDBL_MIN_10_EXP__ (-4931) 
#define __SIZEOF_LONG_LONG__ 8 
#define __GCC_ATOMIC_LLONG_LOCK_FREE 2 
#define __LDBL_DIG__ 18 
#define __FLT_DECIMAL_DIG__ 9 
#define __UINT_FAST16_MAX__ 18446744073709551615UL 
#define __GNUC_GNU_INLINE__ 1 
#define __GCC_ATOMIC_SHORT_LOCK_FREE 2 
#define __UINT_FAST8_TYPE__ unsigned char 
#define __ATOMIC_ACQ_REL 4 
#define __ATOMIC_RELEASE 3 

它看起来并不像有什么事,在那里会告诉你什么Ubuntu的发布你是在。

我认为你需要使用一些外部工具来为你收集信息,比如Barry所建议的。

+0

错误。您指向构建机器,而作者想知道目标上的Linux发行版。 –

+0

这没有意义。您通常不会在编译时知道目标的Linux分布。你绝对没办法用宏来做,除非例如你是一个为特定分销制作包装的包装商,然后他不会问这个问题。 –

+0

谁说他想在编译时知道它?他希望在运行时了解它。 –