RE: gcc question

["HON LUU" <hon@dreambigsemi.com>]

BTW, the change is to make "-fPIC" not fail, but functional can be broken, since I don't run it with kernel.
Regards,
Hon

-----Original Message-----
From: HON LUU 
Sent: Monday, September 13, 2021 12:41 PM
To: Florian Weimer <fweimer@redhat.com>
Cc: Segher Boessenkool <segher@kernel.crashing.org>; gcc-help@gcc.gnu.org
Subject: RE: gcc question

Hi Florian,

Yes, understood the point. I would have to "not using -fPIC" if I could not found any way out. 
Anyway if I willing to change the asm function to change the constraint to something different from "i" (immediate), I wonder if the question is still proper.

Regards,
Hon 

 0:static __always_inline bool arch_static_branch(struct static_key *key, bool branch) {
 1:	asm_volatile_goto("1:"
 2:		".byte " __stringify(STATIC_KEY_INIT_NOP) "\n\t"
 3:		".pushsection __jump_table,  \"aw\" \n\t"
 4:		_ASM_ALIGN "\n\t"
 5:		_ASM_PTR "1b, %l[l_yes], %c0 + %c1 \n\t"
 6:		".popsection \n\t"
 7:		: :  "i" (key),  "i" (branch) : : l_yes);
 8:
 9:	return false;
10:l_yes:
11:	return true;
}

-----Original Message-----
From: Florian Weimer <fweimer@redhat.com> 
Sent: Monday, September 13, 2021 12:23 PM
To: HON LUU <hon@dreambigsemi.com>
Cc: Segher Boessenkool <segher@kernel.crashing.org>; gcc-help@gcc.gnu.org
Subject: Re: gcc question

* HON LUU:

> + Another interesting note is:
>     + if I remove -fPIC from user space gcc command, then the code compile successfully. However -fPIC is the must for my project.

arch_static_branch is useable in the kernel (or kernel modules), but the kernel cannot be compiled with -fPIC.  So you have to stop using one thing or the other.

This isn't really a GCC question, is more about the kernel build system.

Thanks,
Florian