编译时出现Libev错误

Question

我正在尝试编译一个带有-g -Wall -Wextra -DNDEBUG -pedantic -ansi标志的代码，并使用libev库。我在eclipse中遇到了以下错误：

Description Resource    Path    Location    Type
expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘void’  Project     line 827, external location: /usr/include/ev.h  C/C++ Problem
expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘void’  Project     line 820, external location: /usr/include/ev.h  C/C++ Problem
expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘void’  Project     line 821, external location: /usr/include/ev.h  C/C++ Problem
make: *** [src/Object/MySockets/MySockets.o] Error 1    Project         C/C++ Problem
expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘struct’    Project     line 551, external location: /usr/include/ev.h  C/C++ Problem
expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘int’   Project     line 559, external location: /usr/include/ev.h  C/C++ Problem
expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘unsigned’  Project     line 825, external location: /usr/include/ev.h  C/C++ Problem
expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘unsigned’  Project     line 826, external location: /usr/include/ev.h  C/C++ Problem
expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘void’  Project     line 822, external location: /usr/include/ev.h  C/C++ Problem
expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘void’  Project     line 823, external location: /usr/include/ev.h  C/C++ Problem

我已经在ubuntu中安装了libev-dev包。

Answer 1

你的-ansi标志会导致编译器只接受C89代码，并且只会在(glibc/gcc的)标准头文件中启用C89特性。

libev不是被设计成由严格的c89编译器编译的，它至少需要一个posix (或者可能是win32)系统--而且它可能还使用了一些c99特性。