Hi there: I have the following open-source project that cross-compiles to an embedded target:
https://github.com/rdiez/JtagDue I am using Ubuntu 14.04, which comes with autoconf 2.69 and automake 1.14.1. I am building out of the source tree. I noticed that, if I change the version number in the top-level configure.ac by amending the call to AC_INIT(), running "make" in the build directory automatically regenerates the 'configure' script and re-runs it. However, the C++ source files are not rebuilt, because everything is up to date. So it looks like the Autotools get the job only partially done. I searched the Internet and found a number of people asking similar questions, like how to rebuild all sources if the compiler flags change. However, I have not found yet an easy or reliable way to achieve this with Automake. I tried the "maintainer mode", but whatever it actually does, it does not help. There is a variable called EXTRA_<program name>_DEPENDENCIES, but it triggers a re-link only, not a full C++ recompile. I could try to make all object files depend on the makefile, which may not be completely accurate if the makefile includes other files, but it would probably be enough. However, I did not find a way to add an extra dependency to all .o files. I could try to manually guess the .o filenames from the .cpp filenames, but those .o filenames may change in the future, especially in the face of subdir-objects . Is there some Automake variable that lists all the object files for a given program? Please copy me on any answers, as I am not subscribed to this list. Thanks in advance, rdiez
