core: check that function malloc_trim is available, display an error if not available

CMakeLists.txt

@@ -192,6 +192,7 @@ include(CheckSymbolExists)
 check_include_files("langinfo.h" HAVE_LANGINFO_CODESET)
 check_include_files("sys/resource.h" HAVE_SYS_RESOURCE_H)
 
+check_symbol_exists("malloc_trim" "malloc.h" HAVE_MALLOC_TRIM)
 check_function_exists(mallinfo HAVE_MALLINFO)
 check_function_exists(mallinfo2 HAVE_MALLINFO2)
 

config.h.cmake

@@ -5,6 +5,7 @@
 #cmakedefine ICONV_2ARG_IS_CONST 1
 #cmakedefine HAVE_MALLINFO
 #cmakedefine HAVE_MALLINFO2
+#cmakedefine HAVE_MALLOC_TRIM
 #cmakedefine HAVE_EAT_NEWLINE_GLITCH
 #cmakedefine HAVE_ASPELL_VERSION_STRING
 #cmakedefine HAVE_ENCHANT_GET_VERSION

src/core/wee-command.c

@@ -6767,6 +6767,7 @@ COMMAND_CALLBACK(sys)
 
     if (string_strcmp (argv[1], "malloc_trim") == 0)
     {
+#ifdef HAVE_MALLOC_TRIM
         error = NULL;
         value = 0;
         if (argc > 2)
@@ -6776,6 +6777,13 @@ COMMAND_CALLBACK(sys)
                 COMMAND_ERROR;
         }
         malloc_trim ((size_t)value);
+#else
+        gui_chat_printf (NULL,
+                         _("%sFunction \"%s\" is not available on "
+                           "this system"),
+                         gui_chat_prefix[GUI_CHAT_PREFIX_ERROR],
+                         "malloc_trim");
+#endif
         return WEECHAT_RC_OK;
     }