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.) -- Joseph S. Myers jos...@codesourcery.com
