Gcov info registration without constructor?

[Sebastian Huber <sebastian.huber@embedded-brains.de>]

Hello,

I would like to use the -ftest-coverage -fprofile-arcs support on a bare 
metal system (no operating system or very early stages in the system 
startup). In this environment I cannot use the gcov info registration 
via a constructor and __gcov_init(), because there may be some other 
(more complex) constructors registered which cannot be called at this 
stage.. Would it be acceptable to add a compiler option which changes 
the gcov info registration via a constructor to a linker set? If 
enabled, then for each translation unit (see coverage_obj_init()) a 
pointer to the gcov info is placed into a special linker section (for 
example .gcov_info). The linker script collects all .gcov_info data and 
adds a begin/end symbol. The runtime support can then iterate over all 
linker section entries (pointers to struct gcov_info) to dump the 
aggregated gcov data during program termination. Would such changes be 
acceptable for GCC integration or is this too specific?

Kind regards,

     Sebastian

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