Add malloc.h check; fixes build on macos

Tested on kubuntu and freebsd

CMakeLists.txt

@@ -39,6 +39,7 @@ include(ECMQtDeclareLoggingCategory)
 include(KDEClangFormat)
 # Remove OPTIONAL when we require EMC >= 5.79
 include(KDEGitCommitHooks OPTIONAL)
+include(CheckIncludeFiles)
 
 # Allows passing e.g. -DECM_ENABLE_SANITIZERS='address;undefined' to cmake.
 include(ECMEnableSanitizers)
@@ -93,6 +94,8 @@ set(HAVE_X11 ${X11_FOUND})
 # Check for function GETPWUID
 check_symbol_exists(getpwuid "pwd.h" HAVE_GETPWUID)
 
+check_include_files(malloc.h      HAVE_MALLOC_H)
+
 # See above includes for defaults
 add_definitions(
   -DQT_NO_FOREACH

src/Screen.cpp

@@ -8,6 +8,8 @@
 // Own
 #include "Screen.h"
 
+#include "config-konsole.h"
+
 // Qt
 #include <QTextStream>
 
@@ -27,11 +29,13 @@
 #include "profile/Profile.h"
 #include "profile/ProfileManager.h"
 
-// For malloc_trim, which is a GNU extension
-#ifdef __GNUC__
-extern "C" {
-#include <malloc.h>
-}
+#ifdef HAVE_MALLOC_H
+    // For malloc_trim, which is a GNU extension
+    #ifdef __GNUC__
+    extern "C" {
+            #include <malloc.h>
+        #endif
+    }
 #endif
 
 using namespace Konsole;
@@ -1703,12 +1707,14 @@ void Screen::setScroll(const HistoryType &t, bool copyPreviousScroll)
         t.scroll(_history);
     }
 
+#ifdef HAVE_MALLOC_H
 #ifdef Q_OS_LINUX
 #ifdef __GNUC__
     // We might have been using gigabytes of memory, so make sure it is actually released
     malloc_trim(0);
 #endif
 #endif
+#endif
 }
 
 bool Screen::hasScroll() const

src/config-konsole.h.cmake

@@ -11,3 +11,6 @@
 #cmakedefine USE_TERMINALINTERFACEV2
 
 #cmakedefine HAVE_GETPWUID ${HAVE_GETPWUID}
+
+/* Define to 1 if you have the <malloc.h> header file. */
+#cmakedefine HAVE_MALLOC_H 1