pango: add printf attribute

This allows the compiler to catch mismatches between the format
string and the arguments passed in.

Need to add -Wno-format-zero-length because we pass an empty string
on purpose in swaybar/render.c.

2 files changed, 4 insertions, 2 deletions

diff --git a/include/pango.h b/include/pango.h
index 1db113c2..228e39cf 100644
--- a/include/pango.h
+++ b/include/pango.h
@@ -5,6 +5,7 @@
 #include <stdint.h>
 #include <cairo.h>
 #include <pango/pangocairo.h>
+#include "stringop.h"
 
 /**
  * Utility function which escape characters a & < > ' ".
@@ -16,9 +17,9 @@ size_t escape_markup_text(const char *src, char *dest);
 PangoLayout *get_pango_layout(cairo_t *cairo, const PangoFontDescription *desc,
                 const char *text, double scale, bool markup);
 void get_text_size(cairo_t *cairo, const PangoFontDescription *desc, int *width, int *height,
-                int *baseline, double scale, bool markup, const char *fmt, ...);
+                int *baseline, double scale, bool markup, const char *fmt, ...) _SWAY_ATTRIB_PRINTF(8, 9);
 void get_text_metrics(const PangoFontDescription *desc, int *height, int *baseline);
 void render_text(cairo_t *cairo, PangoFontDescription *desc,
-                double scale, bool markup, const char *fmt, ...);
+                double scale, bool markup, const char *fmt, ...) _SWAY_ATTRIB_PRINTF(5, 6);
 
 #endif
diff --git a/meson.build b/meson.build
index d1fbfa38..559ee962 100644
--- a/meson.build
+++ b/meson.build
@@ -18,6 +18,7 @@ add_project_arguments(
                 '-Wno-unused-parameter',
                 '-Wno-unused-result',
                 '-Wno-missing-braces',
+                '-Wno-format-zero-length',
                 '-Wundef',
                 '-Wvla',
         ],