clang 으로 컴파일

test.c:3:1: error: 'main' must return 'int'

clang은 int main() 아니면 배쨰는 중 -_-

음.. 코드가 허접한거라..

$ cat test.c #include <stdio.h> int main() {         int *p;         free(p);         return 0; }

시간은 큰 의미가 없지만.. 아무튼 빌드가 아니라 --analyze만 해서는

빠르게 작동하는 걸 보니 꽤 쓸만해 보이기도?

$ time gcc -o gcc.o test.c

test.c: In function ‘main’:

test.c:7:2: warning: incompatible implicit declaration of built-in function ‘free’ [enabled by default]

real    0m0.611s

user    0m0.510s

sys     0m0.070s

$ time clang -o gcc.o test.c

test.c:7:2: warning: implicit declaration of function 'free' is invalid in C99

      [-Wimplicit-function-declaration]

        free(p);

        ^

1 warning generated.

real    0m0.728s

user    0m0.560s

sys     0m0.110s

$ time clang -o gcc.o test.c --analyze

test.c:7:2: warning: Function call argument is an uninitialized value

        free(p);

        ^    ~

1 warning generated.

real    0m0.325s

user    0m0.220s

sys     0m0.080s

$ time gcc -o gcc.o test.c -fsyntax-only

test.c: In function ‘main’:

test.c:7:2: warning: incompatible implicit declaration of built-in function ‘free’ [enabled by default]

real    0m0.185s

user    0m0.140s

sys     0m0.030s

어?

[링크 : http://stackoverflow.com/questions/14072779/how-can-i-run-gcc-clang-for-static-analysis-warnings-only]