Because Ada semantics, portions of the source code may be shared among
several object files. This is the case for example when generics are
involved, when inlining is active or when declarations generate initialisation
calls. In order to take
into account this shared code, you need to call gcov on all
source files of the tested program at once.
The list of source files might exceed the system's maximum command line
length. In order to bypass this limitation, a new mechanism has been
implemented in gcov: you can now list all your project's files into a
text file, and provide this file to gcov as a parameter, preceded by a @
(e.g. ‘gcov @mysrclist.txt’).
Note that on AIX compiling a static library with -fprofile-arcs is
not supported as there can be unresolved symbols during the final link.