Hi, I am working on a new port of GCC. I am now dealing with multiply, divide, mod. The target machine does not support these operations. Then I think I have to consider LIBGCC. But here I get in trouble. First, there are 2 libgcc : libgcc1 and libgcc2. What is the difference ? When reading GCC Internals, I found information about libgcc2 and I tried to insert the following line in the t-target : LIB2FUNCS_EXTRA=mulhi3.S where mulhi3.S contains the assembler code for the function __mulhi3. When building GCC, no rule to compile mulhi3.S ... I think my t-target is not complete but I do not find anything more. Then I tried this (just like msp430) : LIB1ASMSRC = target/mulhi3.S LIB1ASMFUNCS = __mulhi3 GCC build succeeds (with errors, see below). But then, when linking a program using multiply : undefined reference to `__mulhi3' I tried to add -lgcc in the Makefile when linking but : target-ld: cannot find -lgcc Moreover, when building GCC, it finishes with this error : *** Configuration target-unknown-none not supported make[1]: *** [configure-target-libgcc] Error 1 make[1]: Leaving directory `/home/me/gcc/build_target' make: *** [all] Error 2 I searched about this error. I found a reply. It says "sym-link newlib into GCC sources". I do not understand why is it newlib about? My target has no system. I just would like to disable all of this. I also get an error at 'make install' time : make[2]: Entering directory `/home/me/gcc/build_target/target/libstdc++-v3' make[2]: *** No rule to make target `install'. Stop. make[2]: Leaving directory `/home/me/gcc/build_target/target/libstdc++-v3' make[1]: *** [install-target-libstdc++-v3] Error 2 make[1]: Leaving directory `/home/me/gcc/build_target' make: *** [install] Error 2 This is the same, I am not intrested in libstdc++, how to disable that? So, please, could you help me about how to implement simplest libgcc. Regards. Florent
