gcc 问题

[weixin_38054042]

我在编译时出现
/usr/include/iso/string_iso.h:60: parse error before "size_t"
/usr/include/iso/string_iso.h:61: parse error before "size_t"
/usr/include/iso/string_iso.h:62: parse error before "size_t"
/usr/include/iso/string_iso.h:63: parse error before "size_t"
/usr/include/iso/string_iso.h:68: parse error before "strcspn"
/usr/include/iso/string_iso.h:70: parse error before "strlen"
/usr/include/iso/string_iso.h:71: parse error before "size_t"
/usr/include/iso/string_iso.h:72: parse error before "size_t"
/usr/include/iso/string_iso.h:73: parse error before "size_t"
/usr/include/iso/string_iso.h:74: parse error before "strspn"
/usr/include/iso/string_iso.h:76: parse error before "strxfrm"
/usr/include/iso/string_iso.h:76: parse error before "size_t"
/usr/include/iso/string_iso.h:112: parse error before "size_t"

/usr/include/string.h:63: parse error before "size_t"
/usr/include/string.h:71: parse error before "size_t"
/usr/include/string.h:72: parse error before "strlcpy"
/usr/include/string.h:72: parse error before "size_t"
/usr/include/string.h:73: parse error before "strlcat"
/usr/include/string.h:73: parse error before "size_t"
错误,请高手帮我看看什么原故