r244965 - in /trunk/gcc: ChangeLog config/arm/a...

[ramana@gcc.gnu.org]

Author: ramana
Date: Fri Jan 27 11:22:30 2017
New Revision: 244965

URL: https://gcc.gnu.org/viewcvs?rev=244965&root=gcc&view=rev
Log:
[ARM] Fix PR target/79239 - unrecognized insn after pragma gcc pop_options

{committed for rearnsha}

It turns out that because the compiler uses a hash table to save the
cl_target_option structures it is unsafe to modify the result of
build_target_option_node() (doing so will cause the hash lookup to
fail).  This PR was due to not properly understanding this limitation.

The fix is to create temporary copies of the cl_target_option nodes for
use during target option processing and then only creating the tree node
once the options have been suitably modified.

gcc:
        PR target/79239
        * arm.c (arm_option_override): Don't call build_target_option_node
        until after doing all option overrides.
        (arm_valid_target_attribute_tree): Likewise.

gcc/testsuite:
        * gcc.target/arm/pr79239.c: New test.



Added:
    trunk/gcc/testsuite/gcc.target/arm/pr79239.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/arm/arm.c
    trunk/gcc/testsuite/ChangeLog