[Bug driver/70192] -fno-pic doesn't work with --enable-default-pie

["hjl at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70192

--- Comment #9 from hjl at gcc dot gnu.org <hjl at gcc dot gnu.org> ---
Author: hjl
Date: Thu Mar 17 15:11:35 2016
New Revision: 234295

URL: https://gcc.gnu.org/viewcvs?rev=234295&root=gcc&view=rev
Log:
Properly set flag_pie and flag_pic

We can't set flag_pie to the default when flag_pic == 0, which may be
set by -fno-pic or -fno-PIC, since the default value of flag_pie is
non-zero when GCC is configured with --enable-default-pie.  We need
to initialize flag_pic to -1 so that we can tell if -fpic, -fPIC,
-fno-pic or -fno-PIC is used.

Since Darwin defaults to PIC (__PIC__ == 2) and the PIC setting can't
be changed, skip tests of default __PIC__ and __PIE__ setting for
*-*-darwin* targets.

gcc/

        PR driver/70192
        * opts.c (finish_options): Don't set flag_pie to the default if
        -fpic, -fPIC, -fno-pic or -fno-PIC is used.  Set flag_pic to 0
        if it is -1.

gcc/testsuite/

        PR driver/70192
        * gcc.dg/pic-1.c: New test.
        * gcc.dg/pic-2.c: Likewise.
        * gcc.dg/pic-3.c: Likewise.
        * gcc.dg/pic-4.c: Likewise.
        * gcc.dg/pie-1.c: Likewise.
        * gcc.dg/pie-2.c: Likewise.
        * gcc.dg/pie-3.c: Likewise.
        * gcc.dg/pie-4.c: Likewise.
        * gcc.dg/pie-5.c: Likewise.
        * gcc.dg/pie-6.c: Likewise.

Added:
    trunk/gcc/testsuite/gcc.dg/pic-1.c
    trunk/gcc/testsuite/gcc.dg/pic-2.c
    trunk/gcc/testsuite/gcc.dg/pic-3.c
    trunk/gcc/testsuite/gcc.dg/pic-4.c
    trunk/gcc/testsuite/gcc.dg/pie-1.c
    trunk/gcc/testsuite/gcc.dg/pie-2.c
    trunk/gcc/testsuite/gcc.dg/pie-3.c
    trunk/gcc/testsuite/gcc.dg/pie-4.c
    trunk/gcc/testsuite/gcc.dg/pie-5.c
    trunk/gcc/testsuite/gcc.dg/pie-6.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/common.opt
    trunk/gcc/opts.c
    trunk/gcc/testsuite/ChangeLog