ghc treat certain kinds of warnings as errors when compile c source file.

error-message

D:\Open>gcc test.c -Wall -c
test.c: In function 'g':
test.c:8:14: warning: passing argument 1 of 'f' from incompatible pointer type [-Wincompatible-pointer-types]
     return f(cp);
              ^~
test.c:1:5: note: expected 'int *' but argument is of type 'char *'
 int f(int *a) {
     ^

D:\Open>stack exec -- ghc -c test.c -Wall
test.c: In function 'g':

test.c:8:14: error:
     warning: passing argument 1 of 'f' from incompatible pointer type [-Wincompatible-pointer-types]
         return f(cp);
                  ^~
  |
8 |     return f(cp);
  |              ^

test.c:1:5: error:
     note: expected 'int *' but argument is of type 'char *'
     int f(int *a) {
         ^
  |
1 | int f(int *a) {
  |     ^

test.c

int f(int *a) {
    return 1;
}

int g() {
    char c = 'a';
    char *cp = &c;
    return f(cp);
}