conflicting types for xx错误

编译libvmi 0.8版本时,出现以下错误:

libtool: compile:  gcc -DHAVE_CONFIG_H -I. -I.. -I.. -fvisibility=hidden -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -g -O2 -MT libvmi_la-pretty_print.lo -MD -MP -MF .deps/libvmi_la-pretty_print.Tpo -c pretty_print.c  -fPIC -DPIC -o .libs/libvmi_la-pretty_print.o

pretty_print.c:31: error: conflicting types for ‘vmi_print_hex’

libvmi.h:749: note: previous declaration of ‘vmi_print_hex’ was here

make[3]: *** [libvmi_la-pretty_print.lo] Fehler 1

make[3]: Leaving directory `/usr/local/src/libvmi-0.8/libvmi'

make[2]: *** [all-recursive] Fehler 1

make[2]: Leaving directory `/usr/local/src/libvmi-0.8/libvmi'

make[1]: *** [all-recursive] Fehler 1

make[1]: Leaving directory `/usr/local/src/libvmi-0.8'

make: *** [all] Fehler 2

解决方案:

libvmi/libvmi.h:void vmi_print_hex (unsigned char *data, unsigned long length);和

libvmi/pretty_print.c:void vmi_print_hex (unsigned char *data, size_t length)

中的数据类型改为一致的即可。

见其论坛:https://groups.google.com/forum/?fromgroups#!topic/vmitools/w76m93KevFg

常见此类问题的原因如下(引)

错误:
test.c:22: error: conflicting types for 'urlencode'
test.c:18: error: previous implicit declaration of 'urlencode' was here

原因一:
原来是因为没有先做函数声明,而函数位于main()之后。
在main函数前声明了函数原型后,一切ok.

原因二:

头文件的被循环引用,在引用时考虑清楚包含顺序

原因三:

头文件声明和定义参数稍有不同

例:

头文件中声明 void Hanlder(const char * buf);

在定义时写作 void Hanlder(char * buf);

这是就会发生conflicting types for 错误问题

原文地址:https://www.cnblogs.com/hdk1993/p/7995215.html