On 10/08/2021 19:30, Joseph Myers wrote:
On Tue, 10 Aug 2021, Sebastian Huber wrote:
If -fprofile-update=atomic is used, then the target must provide atomic
operations for the counters of the type returned by get_gcov_type().
This is a 64-bit type for targets which have a 64-bit long long type.
On 32-bit targets this could be an issue since they may not provide
64-bit atomic operations. Allow targets to override the default type
size with the new GCOV_TYPE_SIZE target macro.
Any target macro needs to be documented in tm.texi.in (and tm.texi
regenerated).
Please don't add new target macros that are used in both host and target
code; every such macro is an obstruction to removing inclusion of the host
tm.h from libgcc. The appropriate way to handle sharing such
configuration information is to provide a target hook in the host compiler
code, and then make c-cppbuiltin.c:c_cpp_builtins define a corresponding
predefined macro under the "if (flag_building_libgcc)" conditional.
(Although a target hook is generally preferable to a target macro for
host-side configuration, when a target macro is used on the host it's
still desirable not to use it directly in target libraries but to use a
predefined macro instead.)
Ok, I understood how I can add a compiler provided define for libgcov.
What is not clear to me is how I can add a target hook, set a default
value, and customize it for a target/system. Is this described here
https://gcc.gnu.org/onlinedocs/gccint/Target-Structure.html
?
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