[Bug driver/77529] -fno-pie disables -fPIC

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77529

--- Comment #4 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Matthias Klose from comment #0)
> seen with a GCC 6 configured with --enable-default-pie:
> 
> $ gcc -E -dM  - < /dev/null 2>&1|grep -i 'pi[ce]'
> #define __pie__ 2
> #define __PIE__ 2
> #define __pic__ 2
> #define __PIC__ 2
> 
> $ gcc -E -dM -fPIC - < /dev/null 2>&1|grep -i 'pi[ce]'
> #define __pic__ 2
> #define __PIC__ 2
> 
> $ gcc -E -dM -fPIC -fno-pie - < /dev/null 2>&1|grep -i 'pi[ce]'
> $ gcc -E -dM -fno-pie -fPIC - < /dev/null 2>&1|grep -i 'pi[ce]'
> #define __pic__ 2
> #define __PIC__ 2
> 
> I would expect the last behavior to be the default one.

--enable-default-pie should only change the default.  When -fno-pie -fPIC
are used, the driver behavior should be independent of --enable-default-pie.
GCC 6 without --enable-default-pie, I got

[hjl@gnu-6 gas]$ gcc -E -dM  - < /dev/null 2>&1|grep -i 'pi[ce]'
[hjl@gnu-6 gas]$ gcc -E -dM -fPIC - < /dev/null 2>&1|grep -i 'pi[ce]'
#define __pic__ 2
#define __PIC__ 2
[hjl@gnu-6 gas]$ gcc -E -dM -fPIC -fno-pie - < /dev/null 2>&1|grep -i 'pi[ce]'
[hjl@gnu-6 gas]$ gcc -E -dM -fno-pie -fPIC - < /dev/null 2>&1|grep -i 'pi[ce]'
#define __pic__ 2
#define __PIC__ 2
[hjl@gnu-6 gas]$ 

They match what you got with --enable-default-pie when -fPIC or -fno-pie
are used.