uclibc編譯
當海思自帶的uclibc庫無法滿足要求時，可以通過uclibc源碼編譯出滿足要求的libc版本。如海思自帶的uclibc庫不支持LD_PRELOAD選項時，可以通過編譯uclibc源碼使其支持LD_PRELOAD選項。
查看現有版本
編譯的uclibc版本最好和當前系統的libc版本匹配，這樣移植後續應用程序也比較方便，可以通過如下命令查看當前板子上的uclibc版本，我的板子上uclibc版本是0.9.33.2。
/nfs/h18e3 # ls /lib/ld*
/lib/ld-uClibc-0.9.33.2.so /lib/ld-uClibc.so.0
下載源碼
從如下地址下載對應版本的uclibc：
https://uclibc.org/downloads/
編譯選項
首先解壓下載的uclibc源碼壓縮包：
tar xf uClibc-0.9.33.2.tar.bz2
cd uClibc-0.9.33.2/
make menuconfig
其次設置對應的交叉編譯器與編譯選項：
- 將"Target Architecture"設置爲"arm"。
- 設置"Target Architecture Features and Options"中的"Target Processor Endianness"爲"Little Endian"。
- 設置"Target Architecture Features and Options"中的"Linux kernel header location"爲： “/opt/hisi-linux/x86-arm/arm-himix100-linux/target/usr/include/”（注：需要依據海思交叉編譯器的安裝目錄自行設置）。
- 設置"Development/debugging options"中的"Cros-compiling toolchain prefix"爲"arm-himix100-linux-"。
- 設置"Development/debugging options"中的"Extra CFLAGS"爲"-mcpu=cortex-a7 -mfloat-abi=softfp -mfpu=neon-vfpv4 -fno-aggressive-loop-optimizations"。
- 依照項目的需求自行打開/關閉其他相關編譯選項，如：
- “Target Architecture Features and Options"中的"Enable full C99 math library support”，打開log()等數學函數庫支持。
- “General Library Settings"中的"Enable library loader LD_PRELOAD environment”，開啓LD_PRELOAD支持。
- “General Library Settings"中的"Enable SuSv3 LEGACY macros”，否則 usleep()函數無法使用。
- “String and Stdio Support"中的"Wide Character Support”，打開wchar支持。
- 在調試階段，打開儘可能多的選項。
make選項設置完畢，使用如下命令編譯，並查看生成的so文件：
[cxm@cxm-desktop uClibc-0.9.33.2]$ make -j
[cxm@cxm-desktop uClibc-0.9.33.2]$ ls ./lib/*so*
./lib/ld-uClibc-0.9.33.2.so ./lib/libcrypt.so.0 ./lib/libm-0.9.33.2.so ./lib/libpthread-0.9.33.2.so ./lib/libresolv.so.0 ./lib/libutil.so
./lib/ld-uClibc.so ./lib/libc.so ./lib/libm.so ./lib/libpthread.so ./lib/librt-0.9.33.2.so ./lib/libutil.so.0
./lib/ld-uClibc.so.0 ./lib/libc.so.0 ./lib/libm.so.0 ./lib/libpthread.so.0 ./lib/librt.so
./lib/ld-uClibc.so.lds ./lib/libdl-0.9.33.2.so ./lib/libnsl-0.9.33.2.so ./lib/libresolv-0.9.33.2.so ./lib/librt.so.0
./lib/libcrypt-0.9.33.2.so ./lib/libdl.so ./lib/libnsl.so ./lib/libresolv.a ./lib/libuClibc-0.9.33.2.so
./lib/libcrypt.so ./lib/libdl.so.0 ./lib/libnsl.so.0 ./lib/libresolv.so ./lib/libutil-0.9.33.2.so
編譯應用程序
uclibc編譯成功後，需要將生成的so文件拷貝到交叉編譯器對應的目錄，並重新編譯你的應用程序。使用如下命令確認需要拷貝的目錄：
[cxm@cxm-desktop uClibc-0.9.33.2]$ arm-himix100-linux-gcc -print-file-name=libdl.so
/opt/hisi-linux/x86-arm/arm-himix100-linux/host_bin/../target/usr/lib/libdl.so
[cxm@cxm-desktop uClibc-0.9.33.2]$ file /opt/hisi-linux/x86-arm/arm-himix100-linux/host_bin/../target/usr/lib/libdl.so
/opt/hisi-linux/x86-arm/arm-himix100-linux/host_bin/../target/usr/lib/libdl.so: symbolic link to ../../lib/libdl.so.0
[cxm@cxm-desktop uClibc-0.9.33.2]$ ls /opt/hisi-linux/x86-arm/arm-himix100-linux/host_bin/../target/usr/lib/../../lib/*9.33.2*so
/opt/hisi-linux/x86-arm/arm-himix100-linux/host_bin/../target/usr/lib/../../lib/ld-uClibc-0.9.33.2.so
/opt/hisi-linux/x86-arm/arm-himix100-linux/host_bin/../target/usr/lib/../../lib/libcrypt-0.9.33.2.so
/opt/hisi-linux/x86-arm/arm-himix100-linux/host_bin/../target/usr/lib/../../lib/libdl-0.9.33.2.so
/opt/hisi-linux/x86-arm/arm-himix100-linux/host_bin/../target/usr/lib/../../lib/libm-0.9.33.2.so
/opt/hisi-linux/x86-arm/arm-himix100-linux/host_bin/../target/usr/lib/../../lib/libnsl-0.9.33.2.so
/opt/hisi-linux/x86-arm/arm-himix100-linux/host_bin/../target/usr/lib/../../lib/libpthread-0.9.33.2.so
/opt/hisi-linux/x86-arm/arm-himix100-linux/host_bin/../target/usr/lib/../../lib/libresolv-0.9.33.2.so
/opt/hisi-linux/x86-arm/arm-himix100-linux/host_bin/../target/usr/lib/../../lib/librt-0.9.33.2.so
/opt/hisi-linux/x86-arm/arm-himix100-linux/host_bin/../target/usr/lib/../../lib/libuClibc-0.9.33.2.so
/opt/hisi-linux/x86-arm/arm-himix100-linux/host_bin/../target/usr/lib/../../lib/libutil-0.9.33.2.so
[cxm@cxm-desktop uClibc-0.9.33.2]$ sudo mkdir -p /opt/hisi-linux/x86-arm/arm-himix100-linux/host_bin/../target/usr/lib/../../lib/bak
[cxm@cxm-desktop uClibc-0.9.33.2]$ sudo cp /opt/hisi-linux/x86-arm/arm-himix100-linux/host_bin/../target/usr/lib/../../lib/*9.33.2*so /opt/hisi-linux/x86-arm/arm-himix100-linux/host_bin/../target/usr/lib/../../lib/bak
[cxm@cxm-desktop uClibc-0.9.33.2]$ sudo cp ./lib/*9.33.2*so /opt/hisi-linux/x86-arm/arm-himix100-linux/host_bin/../target/usr/lib/../../lib/
將so拷貝到對應的目錄後，需要重新鏈接應用程序，如果應用程序使用了c++，建議使用靜態鏈接c++庫，即在編譯時添加選項：
arm-himix100-linux-g++ -static-libstdc++ ...
運行
將編譯的所有so文件拷貝到開發板對應的目錄，使用如下命令執行應用程序：
/nfs/h18e3 # ls *9.33.2*so
ld-uClibc-0.9.33.2.so libdl-0.9.33.2.so libnsl-0.9.33.2.so libresolv-0.9.33.2.so libuClibc-0.9.33.2.so
libcrypt-0.9.33.2.so libm-0.9.33.2.so libpthread-0.9.33.2.so librt-0.9.33.2.so libutil-0.9.33.2.so
/nfs/h18e3 # LD_PRELOAD=hook.so ./ld-uClibc-0.9.33.2.so --library-path ./ ./yourapp yourargs 2>&1 | tee log