(Often the prerequisites include header files as well, which you do not want to mention in the recipe. The automatic variable `$<' is just the first prerequisite:) 示例: VPATH = src:../headers foo.o : foo.c defs.h
1、预处理 对源码文件里的文件包括(include)、预编译语句(如宏定义define等)进行分析,编译选项为gcc -E *.c #define DEBUG "debug" int main() { char *a = DEBUG; return 1; } 经过上面的预处理后,能够看到DEBUG被替换成了提前定义的内容 # 1 "hello.c" # 1 "<built-in>" # 1 "<command-lin...
指示新文件的开始 the start of a new file. 返回到一个文件(在include其他文件后) returning to a file (after having included another file). 之后的文本来自系统头文件,故部分warning会被隐藏 the following text comes from a system header file, so certain warnings should be suppressed. 之后的文本被视...
Print the name of each header file used, in addition to other normal activities. Each name is indented to show how deep in the ‘#include’ stack it is. Precompiled header files are also printed, even if they are found to be invalid; an invalid precompiled header file is printed with ‘...
使用命令gcc test.c -E -o test.i,通过预处理器得到预处理后的源代码。可以看到,经过预处理后的源代码主要完成了三件事情:将 include 进行展开,删除注释以及 define 的替换。 # 1 "test.c"# 1 "<built-in>"# 1 "<command-line>"# 31 "<command-line>"# 1 "/usr/include/stdc-predef.h" 1 3...
--generate_entries_without_bounds Generate functions for use from non-instrumented code --guard_calls Use a guard call for a function static initialization --header_context Adds include file context to diagnostics -I directory Add #include search directory --ignore_uninstrumented_pointers Disable check...
The second group consists of any directories named in an -I option to the right of -I-. These directories are searched for header files named in any #include directive. Furthermore, if -I- appears on the command line, then the directory containing the source file is no longer automatically...
#include:这个就是把后面的文件直接拷贝到预处理指令的位置,当然这里也会处理依赖include的问题,比如A文件 include B文件,而B文件又include了C文件,那么在A里面是看到C文件的内容的。还有有个盲区就是,include是可以include xxx.c的,这个在C语言的语法上是没有任何问题的,大家千万别以为只能C文件 include 头文件。
driver program uses when determining what switches to pass to cc1, cc1plus, as, ld, etc. More than one -specs=file For C and C++ source and include files, generate corresponding Ada specs. In conjunction with -fdump-ada-spec[-slim] above, generate Ada specs as child units of parent uni...
gcc的环境变量主要包括include环境变量和库文件环境变量,分别在编译和链接时使用。include搜索路径通常,使用C/C++进行开发程序的时候,会使用头文件,并且有头文件的实现文件,这个时候有三类文件,使用头文件的源文件,头文件,实现头文件的源文件。编译的时候,头文件和源文件一起就可以了。通常他们是在同一目录下的...