关于在cygwin下编译redis出错“Makefile:228: recipe for target 'geohash_helper.o' failed"的解决方法

在cygwin下编译redis4.0.8时，报错：

Makefile:228: recipe for target 'geohash_helper.o' failed
make[1]: *** [geohash_helper.o] Error 1
make[1]: Leaving directory '/redis408/src'
Makefile:6: recipe for target 'all' failed

make: *** [all] Error 2

提示编译geohash_helper.o失败，只要单独编译即可：

 gcc -c geohash_helper.c -o geohash_helper.o

这时重新编译make

提示

hyperloglog.o：在函数‘hllCount’中：
/redis408/src/hyperloglog.c:1033：对‘llroundl’未定义的引用
collect2: 错误：ld 返回 1
Makefile:199: recipe for target 'redis-server' failed
make: *** [redis-server] Error 1

第二个错误，未找到llroundl函数，查看hyperloglog.c文件，发现已引用了math.h文件，先把

llroundl改为round,重新编译，ok

$ gcc -c hyperloglog.c -o hyperloglog.o


Administrator@PC-20180517OAOT /redis408/src

$ make