warning: #ifdef ignored
 --> tests/warnings/preprocess_01.f90:6:1
  |
6 | #ifdef pqr
  | ^^^^^^^^^^^ help: use the '--cpp' command line option to preprocess it

warning: #elif ignored
 --> tests/warnings/preprocess_01.f90:8:1
  |
8 | #elif mno == 18
  | ^^^^^^^^^^^^^^^^ help: use the '--cpp' command line option to preprocess it

warning: #else ignored
  --> tests/warnings/preprocess_01.f90:10:1
   |
10 | #else
   | ^^^^^^ help: use the '--cpp' command line option to preprocess it

warning: #endif ignored
  --> tests/warnings/preprocess_01.f90:13:1
   |
13 | #endif
   | ^^^^^^^ help: use the '--cpp' command line option to preprocess it

warning: #define ignored
  --> tests/warnings/preprocess_01.f90:16:1
   |
16 | #define abc(m, n) m + n
   | ^^^^^^^^^^^^^^^^^^^^^^^^ help: use the '--cpp' command line option to preprocess it

warning: Unsupported macro
  --> tests/warnings/preprocess_01.f90:18:1
   |
18 | #abcd
   | ^^^^^^ Ignored
