In the function `_start ': init.c :(. Text + 0x30): undefined reference to` main'

Question

I am working on a C project with about 30 source files (.c). I build this project on a 32-bit microcontroller (i.MX515), running on Ubuntu using GNU tools.

The compilation phase succeeds, however, when I start the binding process, I get this error (for a complete error at the end of quesiton):

In function `_start': init.c:(.text+0x30): undefined reference to `main' 

I have a main() function that makes simple printf() .

My link makefile is as follows.

 final: $(OBJDIR)/main.o $(OBJDIR)/TchClaKnn_BuildKdtreeInt.o $(OBJDIR)/TchClaKnn_FreeKdtreeInt.o.... (Go upto 30 files like this) @echo ".Linking" $(CC) $(LFLAGS) -o $(OBJDIR)/main.o $(OBJDIR)/TchClaKnn_BuildKdtreeInt.o $(OBJDIR)/TchClaKnn_FreeKdtreeInt.o..... (Go upto 30 files like this) 

Help !!!

Hi

Vikram

---

Complete binding error

 /usr/lib/gcc/arm-linux-gnueabi/4.3.3/../../../crt1.o: In function `_start': init.c:(.text+0x30): undefined reference to `main' collect2: ld returned 1 exit status make[1]: *** [final] Error 1 make[1]: Leaving directory `/home/ubuntu/Documents/Project/IMX_Project_v1' make: *** [all] Error 2 

Answer 1

final depends on main.o (and several others), but your make file accepts all the "others" and displays them in main.o (something most compilers do)

edit your line of links to: -o final $(OBJDIR)/main.o

Answer 2

A component cannot find object code for a source that has main () defined in it. Probably they don’t collect it. Make sure that in any of the 30 files that have main (), it compiles to .OBJ.