how to include in program?

Question

when I develop on openwrt , I include ieee80211.h in my program, but when I compile ,the console reminds me ieee80211.h not found.Then I set the include path like this #include"/home/openwrtsdk/build_dir/build_dir/target_mips_34kc_uClibc_0.9.33.2/linux_firmware52442afee9907bc32a058f22bb3295d040677c26/carl9170fw/include/linux/ieee80211.h", And compile, it also doesn't work,and has following:

error:
/home/xuwy/openwrt/OpenWrt-SDK-15.05.1-ar71xx-nand_gcc-4.8-linaro_uClibc-0.9.33.2.Linux-x86_64/build_dir/target-mips_34kc_uClibc-0.9.33.2/linux-firmware-52442afee9907bc32a058f22bb3295d040677c26/carl9170fw/include/linux/ieee80211.h:897:2: error: unknown type name '__le16'   __le16 control;   

error: /home/xuwy/openwrt/OpenWrt-SDK-15.05.1-ar71xx-nand_gcc-4.8-linaro_uClibc-0.9.33.2.Linux-x86_64/build_dir/target-mips_34kc_uClibc-0.9.33.2/linux-firmware-52442afee9907bc32a058f22bb3295d040677c26/carl9170fw/include/linux/ieee80211.h:898:2: error: unknown type name '__le16'
  __le16 start_seq_num;

Now, I don't have any idea on this, any one can help?

Seriously?????? Did you look at the post after posting? Is that human readable? — Sourav Ghosh, Aug 19 '16 at 06:28
Sorry, the editor will hide"<",and then it shows my question incompletely — wiliam xu, Aug 19 '16 at 07:05

score 2 · Answer 1 · edited Aug 19 '16 at 07:11

This is one of those implicitly inferred sorta things; but the paths of include files cannot be absolute. The compiler has its own built-in PATH-like variable for compilation that gets populated by a list of default directories (eg. /usr/include and /usr/local/include) and directories that are specified by the user via the POSIX standard -I option. To include your header, compile your program with the additional -I option as you see below.

cc -o myprogram main.c -I "/home/openwrtsdk/build_dir/build_dir
/target_mips_34kc_uClibc_0.9.33.2
/linux_firmware52442afee9907bc32a058f22bb3295d040677c26/carl9170fw
/include/linux"

... and in your source file, just add:

#include <ieee80211.h>

how to include in program?

1 Answers1