Torsten Kühnel writes: > Hello, > > i have problems passing a simple float value to an external C function. > > Passing to a function in the same object file gives the expected > results. > > But passing it to a function in another object file, which is linked > into the executable, it arrives not as it is expected. (at least by me) > > > simple sample code-lines, with generated asm listing and some comments: > > http://vtom.org/externfloatfunc.tgz > > > Thank you for any hints. Turn on warnings: $ gcc -Wall func.c test.c func.c: In function 'extern_print_float': func.c:6: warning: format '%d' expects type 'int', but argument 2 has type 'long unsigned int' test.c: In function 'main_print_float': test.c:9: warning: format '%d' expects type 'int', but argument 2 has type 'long unsigned int' test.c: In function 'main': test.c:16: warning: format '%d' expects type 'int', but argument 2 has type 'long unsigned int' test.c:19: warning: implicit declaration of function 'extern_print_float' You need to fix all of these problems. In particular, you need to fix the last one: you must provide a declaration of 'extern_print_float'. Something like extern void extern_print_float(float f); Andrew.
