crt1.o: In function `_start': - undefined reference to `main' in Linux

Question

I am porting an application from Solaris to Linux

The object files which are linked do not have a main() defined. But compilation and linking is done properly in Sol

Answer 1

Try adding -nostartfiles to your linker options, i.e.

$(LINK) -nostartfiles -g ...

From the gcc documentation:

-nostartfiles
    Do not use the standard system startup files when linking. The standard system libraries are used normally, unless -nostdlib or -nodefaultlibs is used. 

This causes crt1.o not to be linked (it's normally linked by default) - normally only used when you implement your own _start code.