问题

Golang链接过程中提示如下警告信息：

ld: warning: object file (/var/folders/r5/7b3lfd015v53ddp05qpjwcdh0000gn/T/go-link-507589565/000007.o) was built for newer OSX version (10.15) than being linked (10.14)
ld: warning: object file (/var/folders/r5/7b3lfd015v53ddp05qpjwcdh0000gn/T/go-link-507589565/000008.o) was built for newer OSX version (10.15) than being linked (10.14)
ld: warning: object file (/var/folders/r5/7b3lfd015v53ddp05qpjwcdh0000gn/T/go-link-507589565/000009.o) was built for newer OSX version (10.15) than being linked (10.14)
ld: warning: object file (/var/folders/r5/7b3lfd015v53ddp05qpjwcdh0000gn/T/go-link-507589565/000010.o) was built for newer OSX version (10.15) than being linked (10.14)
ld: warning: object file (/var/folders/r5/7b3lfd015v53ddp05qpjwcdh0000gn/T/go-link-507589565/000011.o) was built for newer OSX version (10.15) than being linked (10.14)
ld: warning: object file (/var/folders/r5/7b3lfd015v53ddp05qpjwcdh0000gn/T/go-link-507589565/000014.o) was built for newer OSX version (10.15) than being linked (10.14)
ld: warning: object file (/var/folders/r5/7b3lfd015v53ddp05qpjwcdh0000gn/T/go-link-507589565/000015.o) was built for newer OSX version (10.15) than being linked (10.14)
ld: warning: object file (/var/folders/r5/7b3lfd015v53ddp05qpjwcdh0000gn/T/go-link-507589565/000016.o) was built for newer OSX version (10.15) than being linked (10.14)
ld: warning: object file (/var/folders/r5/7b3lfd015v53ddp05qpjwcdh0000gn/T/go-link-507589565/000017.o) was built for newer OSX version (10.15) than being linked (10.14)
ld: warning: object file (/var/folders/r5/7b3lfd015v53ddp05qpjwcdh0000gn/T/go-link-507589565/000018.o) was built for newer OSX version (10.15) than being linked (10.14)
ld: warning: object file (/var/folders/r5/7b3lfd015v53ddp05qpjwcdh0000gn/T/go-link-507589565/000019.o) was built for newer OSX version (10.15) than being linked (10.14)
ld: warning: object file (/var/folders/r5/7b3lfd015v53ddp05qpjwcdh0000gn/T/go-link-507589565/000020.o) was built for newer OSX version (10.15) than being linked (10.14)
ld: warning: object file (/var/folders/r5/7b3lfd015v53ddp05qpjwcdh0000gn/T/go-link-507589565/000021.o) was built for newer OSX version (10.15) than being linked (10.14)
ld: warning: object file (/var/folders/r5/7b3lfd015v53ddp05qpjwcdh0000gn/T/go-link-507589565/000022.o) was built for newer OSX version (10.15) than being linked (10.14)

解决

首先，我们知道一个程序如果想要编译成可执行文件需要四个步骤：预处理、编译、汇编和链接。

一个编译器的工作流程一般会包括以下几个步骤，请看图：

接下来，我们开始分析上述问题的原因。根据系统提示的信息，我们知道中间文件 *.o 文件编译时是为 mac OS 10.15 系统编译的，但是链接的时候却是为 mac OS 10.14 系统链接的，前后存在不一致的情况，因此发出警告。 所以，这就给了我们解决该问题的思路。

思路一、指定或者降低编译器的版本，支持OSX 10.14；

思路二、指定或者提升链接器的版本，支持OSX 10.15。

注意：ld（windows上是ld.exe）是链接器，全称是链接编译器（Link eDitor）。