[Bug bootstrap/86872] [9 Regression] LTO bootstrap failed with profiledbootstrap

[hjl at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86872

--- Comment #6 from hjl at gcc dot gnu.org <hjl at gcc dot gnu.org> ---
Author: hjl
Date: Fri Aug 24 23:37:53 2018
New Revision: 263845

URL: https://gcc.gnu.org/viewcvs?rev=263845&root=gcc&view=rev
Log:
Set start_location to 0 if we ran out of line map space

With profiledbootstrap and --with-build-config=bootstrap-lto, linemap_add
may create a macro map when we run out of line map space.  This patch
changes start_location to UNKNOWN_LOCATION (0) in this case.

Tested with profiledbootstrap and --with-build-config=bootstrap-lto on
Linux/x86-64.

        PR bootstrap/86872
        * line-map.c (pure_location_p): Return true if linemap_lookup
        returns NULL.
        (linemap_add): Set start_location to 0 if we run out of line map
        space.

Modified:
    trunk/libcpp/ChangeLog
    trunk/libcpp/line-map.c