On Thu, 2004-07-15 at 09:34, Ludovic CourtÃs wrote: > Hi, > > Yesterday, 14 hours, 14 minutes, 58 seconds ago, Wil Turner wrote: > > Looking over the output when the library is built, I notice that all of > > the link steps are done using gcc instead of g++, but I'm not sure > > where to change this in configure.ac; g++ *is* used for the .cc -> .o > > steps. Is there a variable that can be set to change the compiler used > > for these steps, or am I doing something else wrong? The documentation > > doesn't seem to mention this problem at all. > > I personally use the following trick in the `Makefile.am' that actually > links against a C++ library: > > CC = $(CXX) This way you compile your whole program using the C++ compiler, i.e. you actually are compiling it as a C++ program, not as a c-program. > AFAIK, this is the only portable way to link, eg. a C program against a > C++ library Well, with gcc/g++, one rather safe way is to use the C++ linker to link the application (There exist other ways, which require low level -Xlinker magic in your linker calls). One way to persuade automake to doing this, is adding a c++-file to the application's sources (Automake uses the c++ linker, if it finds a file using a c++-suffix in a *_PROGRAMS's *_SOURCES). > (using `cc -lstdc++' works with GNU C++ This only works with some (old) versions of gcc for some selected targets (eg. gcc-2.9x on i386). In general (esp. with gcc >= 3.0), it does not work. > but other C++ > environments do not necessarily have `libstdc++'). In order to link > against a C++ library without having a C++ compiler, one needs to have > `libstdc++' (or equivalent) statically linked into the C++ library. Sorry, this is not true. With g++, in general, you have to use "g++" to link and must not explicitly add "-lstdc++". Admitted, there exist some occasions for some apps/libs on some architectures for some versions of gcc where the trick you describe sometimes work, but in general, this does not work. Ralf _______________________________________________ Autoconf mailing list Autoconf@xxxxxxx http://lists.gnu.org/mailman/listinfo/autoconf
