OpenWRT with NetBeans 7.3.1

Question

I am an enthusiastic C/C++ programmer who is new to this firmware customization field of studies. For my final year project I am developing a solution to enhance the packet switching of a router and selected OpenWRT as my opensource firmware. I have been struggling a bit to set up the environment and would like to get your expert opinion on if I am on the correct path.

I followed the following steps to get openWRT to my local PC. (http://wiki.openwrt.org/doc/howto/buildroot.exigence).

In the make menuconfig, I have selected, - Advanced configuration Options -Automatic rebuild of packages -ToolChain Options -Build gdb -Build the OpenWRT Image Builder -Build the OpenWRT SDK -Build the OpenWRT based ToolChain

and saved the config and ran the commands, - make tools/install - make toolchain/install

Then in Netbeans, I've added a new tool collection from Tools -> Options -> C/C++

and gave the base directory as '/openwrt/openwrt/toolchain'

and the C Complier as '/usr/bin/gcc'

Can you experts please advise me if I have done anything wrong? Is this sufficient to develop and compile a new C class to the openWRT firmware so that I can rebuild an image to be flashed into a router?

Your advice is much appreciated dear experts. I was struggling with this issue for quite some time :)

Thanks again :)

EDIT

The issue is that when i set the folder

/openwrt/openwrt/staging_dir/toolchain-i386_gcc-4.5-linaro_uClibc-0.9.32/i486-openwrt-linux

which refers in the tutorial http://downloads.openwrt.org/docs/eclipse.pdf to be set as the cross compiler in the IDE it given an error stating than no Compiler is found in both the eclipse and Netbeans.

BUT it works when i point to the /openwrt/openwrt/toolchain directory.

My query is that is it okey to press on with the development and use the Compiler within the toolchain folder to compile the project?

EDIT 2

The output I get when I run the command

find ./staging_dir -path "./staging_dir/toolchain*" -name *openwrt-linux

within the openwrt folder as suggested by TheCodeArtist is

./staging_dir/toolchain-mips_34kc_gcc-4.6-linaro_uClibc-0.9.33.2/mips-openwrt-l‌inux

EDIT 3

Specifying the C compiler

EDIT 4

refined path

A question that is open for 2 days, but that has a bounty? It seems that this is far too broad. Try to nail your problem down to a specific problem that seeks and answer and not "advice". — Jens Gustedt
The main problem with your question is you do not say what happens when you do the above, and what you think is wrong. FWIW I would suggest building at the command line before you trying getting it to work in Netbeans. — abligh
@JensGustedt Thank you guys for your reply. I will edit the question :) — Hasitha Shan
Based on the output of the find command, it appears that you have built ONLY the MIPS toolchain and NOT the x86 toolchain in openwrt. Now if you are trying to compile a x86-executable/library for x86 target then you do NOT have the toolchain setup properly yet. go back and check openwrt documentation as to how to build a x86 toolchain first. Alternately if you intend to build a MIPS-executable/library for a MIPS router, then use the directory returned by the find command as the cross-compiler directory in eclipse/netbeans. Ensure that you provide a proper "prefix" alongwith it. — TheCodeArtist
The prefix is usually the preceding string in the names of the binaries in the toolchain directory. For example if the names of the files are arm-none-linux-gcc arm-none-linux-ar` etc. then the prefix is arm-none-linux-. Since you seem to be having a MIPS toolchain, it would be something along the lines of mips-*-gcc etc. within the ./staging_dir/toolchain-mips_34kc_gcc-4.6-linaro_uClibc-0.9.33.2/mips-openwrt-l‌inux directory. Find and use the right prefix while specifying the toolchain directory. — TheCodeArtist

TheCodeArtist TheCodeArtist · Accepted Answer · 2014-02-02T17:58:36

Provide the appropriate toolchain directory for the target architecture (x86, arm, mips etc.) based on the device you intend to run the resulting executables as the Base Directory.

Next provide the relative path/filenames of the individual commands for C compiler, C++ compiler etc. These will be relative paths(including the filenames) to the appropriate binaries within the toolchain directory specified above.

How to verify the toolchain settings?

Using the IDE, compile a simple hello-world.c program. Something like

/* hello-world.c */
int main()
{
    return (42);
}

Give a Build using the IDE and check the compilation output window. Understand the errors if any and modify the configuration options accordingly.

Once a build succeeds and it will result in a binary hello-world within the project directory. Open a new terminal and run the file command on newly generated binary to verify that it is indeed built for the target architecture. For example a binary built for x86-64 would show.

$ file hello-world
hello-world: ELF 64-bit LSB executable, x86-64, version 1 (GNU/Linux), dynamically linked (uses shared libs), for GNU/Linux 2.6.18, not stripped

In your case i assume it would be a MIPS executable if the mips toolchain and compiler are properly configured within the IDE settings.

OpenWRT with NetBeans 7.3.1

1 Answers

How to verify the toolchain settings?