fatal error: 'iostream' file not found

[lorenzoditucci]

Hi
I have a C++ code and when I try to run:
clang -O -c filename.cpp
I get:

fatal error: 'iostream' file not found
#include
^~~~~~~~~~
1 error generated.

If I try to include the path to iostream like:

clang -O -c filename.cpp -I/riscv-llvm/riscv/_install/riscv64-unknown-elf/include/c++/8.2.0
then I get another file not found:
fatal error: 'bits/c++config.h' file not found
#include <bits/c++config.h>
^~~~~~~~~~~~~~~~~~
1 error generated.

I found the bit folder to be empty. Do you have any clue on what is happening here?

Thanks

[aditya4d]

Here is how I fixed it.
I included c++/9.2.0 and c++/9.2.0/riscv64-unknown-elf with clang++ and able to compile cpp file to binary.

To check if clang++ is using right flags and directories, use -v flag at the end of command line to print verbose trace.

Digging deeper in clang repo, C++ support is not tested. I didn't see any tests with .cpp extension. The fact that you need gnu linker makes me think that C++ feature is seeing the same fate too