Checking type size

[xq114]

xmake中如何测试type占用的字节数？类似cmake中的checktypesize：

include(CheckTypeSize)
CHECK_TYPE_SIZE(long SIZEOF_LONG)
CHECK_TYPE_SIZE(off_t SIZEOF_OFF_T)

if ("${SIZEOF_OFF_T}" LESS 8)
  option(CGNS_ENABLE_LFS "Enable or disable large file support" "OFF")
endif ("${SIZEOF_OFF_T}" LESS 8)

[waruqi]

目前只能snippet检测，走 includes("check_cxsnippets.lua") 里面的辅助接口，check_csnippets/check_cxxsnippets

check_cxxsnippets("CGNS_ENABLE_LFS", [[#include <stdlib.h>
static_assert(sizeof(off_t) == 8, "");]])

或者直接走 option 里面的 add_cxxsnippets/add_csnippets

[jingkaimori]

有些autoconf导出的包，必须把类型占用的字节数写到配置文件里：

/* The size of `int', as computed by sizeof. */
#undef SIZEOF_INT

/* The size of `intmax_t', as computed by sizeof. */
#undef SIZEOF_INTMAX_T

/* The size of `intptr_t', as computed by sizeof. */
#undef SIZEOF_INTPTR_T

[waruqi]

有些autoconf导出的包，必须把类型占用的字节数写到配置文件里：

/* The size of `int', as computed by sizeof. */
#undef SIZEOF_INT

/* The size of `intmax_t', as computed by sizeof. */
#undef SIZEOF_INTMAX_T

/* The size of `intptr_t', as computed by sizeof. */
#undef SIZEOF_INTPTR_T

我记得是支持了，捕获输出 output = true

xmake/tests/apis/check_xxx/xmake.lua

Line 46 in 68153d0

configvar_check_csnippets("PTR_SIZE", 'printf("%d", sizeof(void*)); return 0;', {output = true, number = true})