From dae0de44617cf9e4584f8aa8cd34db4cd928a0c8 Mon Sep 17 00:00:00 2001
From: Rory OConnell <19547+RoryO@users.noreply.github.com>
Date: Sat, 29 Aug 2020 17:19:49 -0700
Subject: Add call to malloc_trim on a full GC

---
 src/gc.c                  | 6 ++++++
 tasks/toolchains/gcc.rake | 2 ++
 2 files changed, 8 insertions(+)

diff --git a/src/gc.c b/src/gc.c
index 393f7f62c..302d5cd68 100644
--- a/src/gc.c
+++ b/src/gc.c
@@ -6,6 +6,9 @@
 
 #include <string.h>
 #include <stdlib.h>
+#ifdef HAS_MALLOC_TRIM
+#include <malloc.h>
+#endif
 #include <mruby.h>
 #include <mruby/array.h>
 #include <mruby/class.h>
@@ -1319,6 +1322,9 @@ mrb_full_gc(mrb_state *mrb)
     gc->full = FALSE;
   }
 
+#ifdef HAS_MALLOC_TRIM
+  malloc_trim(0);
+#endif
   GC_TIME_STOP_AND_REPORT;
 }
 
diff --git a/tasks/toolchains/gcc.rake b/tasks/toolchains/gcc.rake
index 810f23b7a..3d55e6171 100644
--- a/tasks/toolchains/gcc.rake
+++ b/tasks/toolchains/gcc.rake
@@ -31,6 +31,8 @@ MRuby::Toolchain.new(:gcc) do |conf, params|
   end
 
   [[conf.cc, 'c'], [conf.cxx, 'c++']].each do |cc, lang|
+    cc.defines += %w(HAS_MALLOC_TRIM) if cc.has_function? 'malloc_trim', with_header: 'malloc.h'
+
     cc.instance_variable_set :@header_search_language, lang
     def cc.header_search_paths
       if @header_search_command != command
-- 
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