error: C preprocessor fails sanity check

问题

./configure --prefix=/opt/mips_lib/libev --host=mipsel-openwrt-linux CC=mipsel-openwrt-linux-gcc

运行后提示

checking how to run the C preprocessor... mipsel-openwrt-linux-gcc --sysroot=/opt/mt7628/toolchain-mipsel_24kc_gcc-8.4.0_musl -I/opt/mt7628/toolchain-mipsel_24kc_gcc-8.4.0_musl/usr/include
configure: error: in `/opt/mips_lib/libev-4.19':
configure: error: C preprocessor "mipsel-openwrt-linux-gcc --sysroot=/opt/mt7628/toolchain-mipsel_24kc_gcc-8.4.0_musl -I/opt/mt7628/toolchain-mipsel_24kc_gcc-8.4.0_musl/usr/include" fails sanity check
See `config.log' for more details

解决

./configure --prefix=/opt/mips_lib/libev --host=mipsel-openwrt-linux CC=mipsel-openwrt-linux-gcc CPP='mipsel-openwrt-linux-g++ -E'

参考

配置:错误:C预处理器无法进行健全性检查