Dear Kixorz,
Thank you for your response.
Finally, I was able to compile my own Helloworld (and it works well in Turris Omnia). It was much simpler than I had though.
What I did:
- Download
OpenWrt-SDK-mvebu_gcc-4.8-linaro_musl-1.1.15_eabi.Linux-x86_64.tar.bz2
- Uncompress it to
OpenWrt-SDK
(short folder name makes things easier)
- Copy my own source package [1] into OpenWrt-SDK/packages
cp -R helloworld OpenWrt-SDK/package
- Change dir to OpenWrt-SDK and execute make package/helloworld/compile
make package/helloworld/compile
- Find helloworld package in OpenWrt-SDK/bin/package…
ls bin/mvebu-musl/packages/base/helloworld_1_mvebu.ipk
- Copy this package to my router
scp bin/mvebu-musl/packages/base/helloworld_1_mvebu.ipk root@10.1.10.1:/root
- After login in the router, install the package
dpkg install helloworld_1_mvebu.ipk
- Execute to test it!
helloworld
[1] Here is my source package structure
helloworld/
helloworld/Makefile [2]
helloworld/src/
helloworld/src/Makefile [3]
helloworld/src/helloworld.c [4]
[2] Here is OpenWRT Package Makefile. It was copied from https://www.gargoyle-router.com/old-openwrt-coding.html and I needed to change description part
##############################################
# OpenWrt Makefile for helloworld program
#
#
# Most of the variables used here are defined in
# the include directives below. We just need to
# specify a basic description of the package,
# where to build our program, where to find
# the source files, and where to install the
# compiled program on the router.
#
# Be very careful of spacing in this file.
# Indents should be tabs, not spaces, and
# there should be no trailing whitespace in
# lines that are not commented.
#
##############################################
include $(TOPDIR)/rules.mk
# Name and release number of this package
PKG_NAME:=helloworld
PKG_RELEASE:=1
# This specifies the directory where we're going to build the program.
# The root build directory, $(BUILD_DIR), is by default the build_mipsel
# directory in your OpenWrt SDK directory
PKG_BUILD_DIR := $(BUILD_DIR)/$(PKG_NAME)
include $(INCLUDE_DIR)/package.mk
# Specify package information for this program.
# The variables defined here should be self explanatory.
# If you are running Kamikaze, delete the DESCRIPTION
# variable below and uncomment the Kamikaze define
# directive for the description below
define Package/helloworld
SECTION:=utils
CATEGORY:=Utilities
TITLE:=Helloworld -- prints a snarky message
# DESCRIPTION:=\
# If you can't figure out what this program does, \\\
# you're probably brain-dead and need immediate \\\
# medical attention.
endef
# Uncomment portion below for Kamikaze and delete DESCRIPTION variable above
define Package/helloworld/description
If you can't figure out what this program does, you're probably
brain-dead and need immediate medical attention.
#endef
# Specify what needs to be done to prepare for building the package.
# In our case, we need to copy the source files to the build directory.
# This is NOT the default. The default uses the PKG_SOURCE_URL and the
# PKG_SOURCE which is not defined here to download the source from the web.
# In order to just build a simple program that we have just written, it is
# much easier to do it this way.
define Build/Prepare
mkdir -p $(PKG_BUILD_DIR)
$(CP) ./src/* $(PKG_BUILD_DIR)/
endef
# We do not need to define Build/Configure or Build/Compile directives
# The defaults are appropriate for compiling a simple program such as this one
# Specify where and how to install the program. Since we only have one file,
# the helloworld executable, install it by copying it to the /bin directory on
# the router. The $(1) variable represents the root directory on the router running
# OpenWrt. The $(INSTALL_DIR) variable contains a command to prepare the install
# directory if it does not already exist. Likewise $(INSTALL_BIN) contains the
# command to copy the binary file from its current location (in our case the build
# directory) to the install directory.
define Package/helloworld/install
$(INSTALL_DIR) $(1)/bin
$(INSTALL_BIN) $(PKG_BUILD_DIR)/helloworld $(1)/bin/
endef
# This line executes the necessary commands to compile our program.
# The above define directives specify all the information needed, but this
# line calls BuildPackage which in turn actually uses this information to
# build a package.
$(eval $(call BuildPackage,helloworld))
[3] Here is the GNU Makefile. I took this also from https://www.gargoyle-router.com/old-openwrt-coding.html . Please replace this-is-a-tab with a real tabulation
# build helloworld executable when user executes "make"
helloworld: helloworld.o
this-is-a-tab $(CC) $(LDFLAGS) helloworld.o -o helloworld
helloworld.o: helloworld.c
this-is-a-tab $(CC) $(CFLAGS) -c helloworld.c
# remove object files and executable when user executes "make clean"
clean:
this-is-a-tab rm *.o helloworld
[4] Here is the helloworld source code, just for your reference.
/****************
* Helloworld.c
*****************/
#include <stdio.h>;
int main(void)
{
printf("Hello world!\n\n");
return 0;
}
Thank you Kixorz and Miska for your time and support.
With best regards
Sebastian