Follow these steps to create and build a "Hello world" application:
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Create a directory called hello_world:
~$ mkdir hello_world
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Inside the hello_world directory, create a file named hello-world.c:
~$ cd hello_world ~$ touch hello-world.c
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Edit the hello-world.c file with the following contents:
hello-world.c#include <stdio.h> #include <unistd.h> int main(int argc, char *argv[]){ int i; for (i = 1; i <= 10; i++) { printf("%d - Hello world!\n", i); sleep(1); } return 0; }
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Create a makefile file inside the hello_world directory:
~$ touch Makefile
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Edit the file Makefile with the following contents:
MakefileBINARY := hello-world CFLAGS += -Wall -O0 .PHONY: all all: $(BINARY) $(BINARY): hello-world.o .PHONY: clean clean: -rm -f *.o $(BINARY)
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Before building the code, export the toolchain environment:
~$ . /opt/dey/3.0-r4/ccimx6ulsbc/environment-setup-cortexa7t2hf-neon-dey-linux-gnueabi
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Cross-compile the code using make.
~$ make
If you are building a Qt application, run qmake before cross-compiling:
~$ qmake
The binary file, hello-world, is generated inside the directory hello_world.
~$ ls -l total 28 -rwxrwxr-x 1 user user 12084 dic 18 12:39 hello-world -rw-rw-r-- 1 user user 199 dic 18 12:39 hello-world.c -rw-rw-r-- 1 user user 4968 dic 18 12:39 hello-world.o -rw-rw-r-- 1 user user 189 dic 18 12:39 Makefile