这个是一个gnu的extension,glibc会使用这个功能,标记即将被淘汰的符号,产生链接时的警告,比如:
/* When a reference to SYMBOL is encountered, the linker will emit a
warning message MSG. */
/* We want the .gnu.warning.SYMBOL section to be unallocated. */
#define __make_section_unallocated(section_string) \
asm (".section " section_string "\n\t.previous");
#define link_warning(symbol, msg) \
__make_section_unallocated (".gnu.warning." #symbol) \
static const char __evoke_link_warning_##symbol[] \
__attribute__ ((used, section (".gnu.warning." #symbol __sec_comment))) \
= msg;
link_warning (pthread_attr_setstackaddr,
"the use of `pthread_attr_setstackaddr' is deprecated, use `pthread_attr_setstack'")
效果
/tmp/ccVxpFwZ.o: In function `main':
warning1.c:(.text+0xe): warning: the use of `pthread_attr_setstackaddr' is deprecated, use `pthread_attr_setstack'
需要注意,如果函数和main函数是再一个编译单元,不会trigger这个warning。需要变成成单独的o/so文件,在链接时才会报错。
标签:__,ld,attr,gnu,section,warning,pthread,glibc From: https://blog.csdn.net/qq_36428903/article/details/141859269