Make each convenience library depend on the ones it requires, which is
pretty straightforward for us as they each only depend on a single
other one, avoiding any worry about double linking of static objects.
Drop the loop in mem_read() in favor of a single memcpy() call.
This greatly improves performances when nmemb > 1, for a small loss
for some values of size when nmemb == 1. Gain can theoretically be
infinite since swapping nmemb and size parameters changes almost
nothing while it had a dramatic performance impact previously. Loss
is up to about 25% in the worst case for some values of size when
nmemb is 1.
Also, now the function always copies as much data as possible, not only
whole blocks. This follows the glibc implementation of fread() and
simplifies the code. Doing so also fixes the position after a partial
read to be at the last readable character rather than the end of the
last read block.
The flags in this variables are used to tune the linker behavior on the
final libgeany (currently set the version information), so should only
used on really linked libraries, not Libtool helper libraries.
Checks if the compiler supports -fvisibility and the linker supports
-dynamic-list arguments and use them instead of hardcoding. The new
geany-lib.m4 also accomodates future use of Libtool versioning.
This will allow plugins to link against the core when accessing API
functions, now that the macro/struct/funcptr stuff is gone.
Also convert the helper libraries into Libtool helper libraries as
linking a shared library against static libraries is (apparently) not
portable.
Split ctags and tagmanager sources, as follows:
tagmanager/ctags: the parsers, more or less upstream CTags;
tagmanager/mio: local MIO library copy;
tagmanager/src: actual tagmanager sources.
