This is enabled for platforms/compilers that support the -MMD
option, which creates a dependency file named out.d when compiling
to a file named out.o, only including local, not system headers.
The additional -MP option adds phony targets for all included
headers, to avoid having make error out due to "no rule to make
target foo.h" if a header is renamed/removed.
This makes sure that all the right files are rebuilt if a header
is changed, avoiding the need for a full rebuild if only a few
files are affected.
Don't enable threading globally since the MSVC/ARM build target
(neither windows phone nor windows rt) doesn't support the normal
windows threading functions.
This makes sure that e.g. "make clean" actually removes
the built exe files, and avoids relinking the exe files each
time make is run when cross compiling from linux to windows.
(Make on windows seems to have an exception that knows to skip
rebuilding the 'h264enc' target if 'h264enc' doesn't exist but
'h264enc.exe' does, but this exception doesn't work on normal
unix make.)
The library uses this define to enable OS X specific functionality
in general, even if none of those snippets actually have been
strictly required so far.
By setting an overridable variable in the main makefile, we avoid
having to move the default -DUNIX64 into each of the other unix
platform makefiles, but still allowing the mingw platform to
override it.
This makes sure that all the dependency libs are built before trying
to link them together, fixing parallel make (which occasionally
failed due to trying to link the encoder or decoder command line
binaries before the libs had been built) and also fixes building an
individual component by e.g. "make h264enc".
Add platform-freebsd.mk makefile to allow building on FreeBSD.
OpenH264 builds and runs successfully on FreeBSD 9.2-RELEASE amd64, with both
the gcc and clang compilers.
Note that building i386 binaries with the native toolchain using the -m32 flag
on amd64 FreeBSD is unsupported and will not work, so ENABLE64BIT should always
be set to Yes when compiling on a FreeBSD amd64 system.
