Add hedley to C exe projects to disable cast-qual

This warning is raised, because the destroy_library calls free on a
const char* pointer, but the pointer must be cast to void* first.

Author: friendlyanon

cmake-init/templates/c/executable/CMakeLists.txt

@@ -29,7 +29,16 @@ target_include_directories(
 target_compile_features({= name =}_lib PUBLIC c_std_{= std =}){% if pm %}
 
 find_package(json-c REQUIRED)
-target_link_libraries({= name =}_lib PRIVATE json-c::json-c){% end %}
+target_link_libraries({= name =}_lib PRIVATE json-c::json-c)
+
+find_path(HEDLEY_INCLUDE_DIR hedley.h)
+if(NOT HEDLEY_INCLUDE_DIR)
+  message(FATAL_ERROR "Couldn't find hedley.h (${HEDLEY_INCLUDE_DIR})")
+endif()
+target_include_directories(
+    {= name =}_lib SYSTEM
+    PRIVATE "${HEDLEY_INCLUDE_DIR}"
+){% end %}
 
 # ---- Declare executable ----
 

cmake-init/templates/c/executable/source/lib.c

@@ -1,5 +1,6 @@
 #include "lib.h"{% if pm %}
 
+#include <hedley.h>
 #include <json-c/json_object.h>
 #include <json-c/json_tokener.h>
 #include <stddef.h>
@@ -57,7 +58,10 @@ library create_library()
   return lib;
 }{% if pm %}
 
+HEDLEY_DIAGNOSTIC_PUSH
+HEDLEY_DIAGNOSTIC_DISABLE_CAST_QUAL
 void destroy_library(library* lib)
 {
   free((void*)lib->name);
-}{% end %}
+}
+HEDLEY_DIAGNOSTIC_POP{% end %}

cmake-init/templates/common/conanfile.txt

@@ -1,5 +1,6 @@
 [requires]
-{% if c %}json-c/0.15{% else %}fmt/8.1.1{% end %}
+{% if c %}{% if exe %}hedley/15
+{% end %}json-c/0.15{% else %}fmt/8.1.1{% end %}
 
 # Testing only dependencies below
 catch2/2.13.8

cmake-init/templates/common/vcpkg.json

@@ -5,7 +5,11 @@
     {
       "name": "{% if c %}json-c{% else %}fmt{% end %}",
       "version>=": "{% if c %}2019-09-10{% else %}8.1.1{% end %}"
-    }
+    }{% if c and exe %},
+    {
+      "name": "hedley",
+      "version>=": "15"
+    }{% end %}
   ],
   "default-features": [],
   "features": {