I am working on an Autools front-end for a C++ library. It looks like Libtool is adding C source files to the project and its causing a fair amount of trouble on some platforms. We think its causing unexplained crashes like Message “During startup program terminated with signal SIGKILL” from GDB.
The C source files cause trouble for several reasons. First, we only query CXXFLAGS and set AM_CXXFLAGS; and we don't do anything with CFLAGS or AM_CFLAGS. Second, C files need additional options in a C++ project, like -frtti and -fexceptions under GCC and options like -qrtti under IBM XL C/C++ compiler. Its not clear to me if libtool is adding the necessary options. Third, the C source files added by Libtool need additional Posix options on platforms that use Newlib, like Cygwin and MSYS. Our source files don't need the options.
I'd like to force Libtool to use C++ instead of C but I have not been able to locate an option or method to do so. I think the easiest path would be for Libtool to use lt-<some file>.cpp and CXXFLAGS rather than lt-<some file>.c and CFLAGS but I can't figure out how to do it.
How do we tell Libtool to use C++ and not C?
A related problem is How to disable C compiler in C++ Autotools project, but it only ask to use the C++ compiler for feature testing.
