Add support to integer modulo operator

Having support for the '%' operator makes it easier to implement
even/odd version checks, like:

    enable_debug = get_option('enable-debug')
    if enable_debug == 'auto'
      if minor_version % 2 == 0
        enable_debug = 'minimum'
      else
        enable_debug = 'yes'
      endif
    endif

which would be impossible without resorting to less obvious long-hand
forms like:

  a - (b * (a / b))

1 files changed, 4 insertions, 0 deletions

diff --git a/mesonbuild/interpreter.py b/mesonbuild/interpreter.py
index ac95e15..535a3f0 100644
--- a/mesonbuild/interpreter.py
+++ b/mesonbuild/interpreter.py
@@ -2595,6 +2595,10 @@ class Interpreter():
             if not isinstance(l, int) or not isinstance(r, int):
                 raise InvalidCode('Division works only with integers.')
             return l // r
+        elif cur.operation == 'mod':
+            if not isinstance(l, int) or not isinstance(r, int):
+                raise InvalidCode('Modulo works only with integers.')
+            return l % r
         else:
             raise InvalidCode('You broke me.')