原 src/core/ngx_murmurhash.c:37:11: error: this statement may fall through [-Werror=implicit-fallthroug

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场景：在阿里云centos 8 下安装nginx-1.9.0 报错如下：

src/core/ngx_murmurhash.c: In function ‘ngx_murmur_hash2’:
src/core/ngx_murmurhash.c:37:11: error: this statement may fall through [-Werror=implicit-fallthrough=]
         h ^= data[2] << 16;
         ~~^~~~~~~~~~~~~~~~
src/core/ngx_murmurhash.c:38:5: note: here
     case 2:
     ^~~~
src/core/ngx_murmurhash.c:39:11: error: this statement may fall through [-Werror=implicit-fallthrough=]
         h ^= data[1] << 8;
         ~~^~~~~~~~~~~~~~~
src/core/ngx_murmurhash.c:40:5: note: here
     case 1:
     ^~~~
cc1: all warnings being treated as errors
make[1]: *** [objs/Makefile:445: objs/src/core/ngx_murmurhash.o] Error 1
make[1]: Leaving directory '/usr/local/java/nginx-1.9.9'
make: *** [Makefile:8: build] Error 2
[root@iZuf6bhe673f5qtkz6pwjuZ nginx-1.9.9]#

解决办法：

找到目录：/usr/local/java/nginx-1.9.0/objs/Makefile 文件，去掉里面的 -Werror 即可。

更改前：

CFLAGS =  -pipe  -O -W -Wall -Wpointer-arith -Wno-unused -Werror -g

更改后：

CFLAGS =  -pipe  -O -W -Wall -Wpointer-arith -Wno-unused -g