[Bug target/79041] aarch64 backend emits R_AARCH64_ADR_PREL_PG_HI21 relocation despite -mpc-relative-literal-loads option being used

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79041

--- Comment #8 from Wilco <wilco at gcc dot gnu.org> ---
Author: wilco
Date: Tue Jul 25 12:08:59 2017
New Revision: 250514

URL: https://gcc.gnu.org/viewcvs?rev=250514&root=gcc&view=rev
Log:
Fix PR79041

As described in PR79041, -mcmodel=large -mpc-relative-literal-loads
may be used to avoid generating ADRP/ADD or ADRP/LDR.  However both
trunk and GCC7 may still emit ADRP for some constant pool literals.
Fix this by adding a aarch64_pcrelative_literal_loads check.

    gcc/
        PR target/79041
        * config/aarch64/aarch64.c (aarch64_classify_symbol):
        Avoid SYMBOL_SMALL_ABSOLUTE for literals with pc-relative literals.
    gcc/testsuite/
        * gcc.target/aarch64/pr79041-2.c: New test.

Added:
    branches/gcc-7-branch/gcc/testsuite/gcc.target/aarch64/pr79041-2.c
Modified:
    branches/gcc-7-branch/gcc/ChangeLog
    branches/gcc-7-branch/gcc/config/aarch64/aarch64.c
    branches/gcc-7-branch/gcc/testsuite/ChangeLog