Am Fri, 20 Dec 2013 08:40:28 +0100 schrieb Jacob Carlborg <d...@me.com>:
> > I think asking the binutils maintainers to add __tdata_begin, > > __tdata_end, __tbss_begin and __tbss_end markers to the tdata and > > tbss sections would be a nice long-term solution, or is there some > > issue with that? > > How does that work? Do people need to update their linkers for that > to work? > Likely yes, that's why I said 'longterm' solution. You need to edit the default linker script. Then there are 2 options: We can force certain object files to be at the start or the end of the section. So we could introduce dso_start.o and dso_end.o files containing the start/end sections and those would always be placed as the first/last objects in a section. (This is how the C++/C runtime calls the constructors in the .ctors section: crtbegin.o contains a __CTOR_LIST__ symbol) It's also possible to directly instruct the linker to insert a symbol at the start of the section and at the end of the section. This way you don't need special object files but the symbols will appear always, even for C/C++ programs. In theory it's always possible to use your own linker script without updating the compiler, but that's not a practical solution. Implicit linker-script which only extend the default script can be used for custom sections, but AFAIK this doesn't work for standard sections.
