Bernd Roesch schrieb:
without changed headers old ompiler and libs do not work, because for C there is no sqrtf and other C99 funcs and many C++ programs get also many errors.
Ok, you are trying to add C99 functions to your libc. Apparently you made a mistake if you get linker errors.
i see old libstdc++ contain sqrtf but get many other linker errors.
What is an "old libstdc++"? AFAICT there was/is no sqrtf function in libstdc++. In the sqrt case there are inline wrapper functions with either a float or a double arg. These inlines use an appropriate sqrt builtin. Since these builtins do not exist for your target the compiler generates a call to the real function without the __builtin prefix.
there is also a sqrtf not undef in cmath as many other functions are. When i define sqrtf in math.h then the sqrtf func in libstdc++ is maybe not add and this strange linker error come.but wy it work not correct when i add sqrtf to libc i dont know.only solution below work.
libstdc++ _requires_ real functions to be present in your libc. If you get linker errors then the linker cannot locate functions. There really is no need to play #define games on __builtin names to get it work. Gunther
