What is Clang ? How to compile C program using clang

$ sudo apt install clang The following NEW packages will be installed:   binfmt-support clang clang-6.0 libclang-common-6.0-dev libclang1-6.0 libffi-dev libobjc-7-dev libobjc4 libomp-dev libomp5 libtinfo-dev llvm-6.0 llvm-6.0-dev llvm-6.0-runtime As we can see above installing clang on ubuntu also installs LLVM. Now, lets write our simple C program as, $ vim helloworld.c #include <stdio.h> int main(int argc, char **argv) {         printf("Hello World\n");         return 0; } Now, we can compile the program using clang as below, $ clang helloworld.c Above command generates binary executable with default name a.out, now we can execute the program as below, $ ./a.out  Hello World If we want to give different name to executable, we can do the same in a similar way as we do with GCC, $ clang -o hello helloworld.c $ ./hello  Hello World $ ls -l hello -rwxr-xr-x 1 devlab devlab 8184 Jul  5 08:21 hello If we want to generate optimised binary executable pass “-Oz” as additional parameter to above command to generate binary with maximum possible optimisation, $ clang -o hello helloworld.c -Oz References –  http://clang.llvm.org/get_started.html

Risk level: destructive. Review the command before running it.