[LLVMdev] HELP: Clang options needed in command to compile device driver into linux module.

[Nick Lewycky]

15102925731 wrote:
> Hello£¬
>
> What option should be added in the clang command to compile linux device
> driver£¨from .c to .bc£©?
> Typically we need a makefile to compile a module. But I just want a
> simple command line.

Make, using the information in the Makefile, runs gcc or clang with a 
long command line. That command line tells gcc/clang how to do things, 
like where to find linux/init.h or how certain macros are to be defined.

It doesn't matter whether you run clang from the makefile or not, but 
you will need the correct command line for it to work. What command line 
does make run gcc with?

Nick

>
> I tried *"clang -O3 -emit-llvm hello.c -c -o hello.bc "* but errors
> occurred saying
> fatal error: 'linux/init.h' file not found
> #include <linux/init.h>
> ^
> 1 error generated
> Then I was taught to add -D or -I option so that clang can find the
> linux kernel head file. But I still dont know
> how exactly the command like......All I want to know is a clang command
> line that can compile a helloworldmodule.c into helloworldmodule.bc.
>
> Please give me some suggestion.
> Any help would be appreciated!
>
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> 2012-04-12
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