unix: Create __bss_start and _end symbols for Mach-O targets.

It's a hack, but can't find a cleaner way to do it.

1 files changed, 38 insertions, 0 deletions

diff --git a/unix/seg_helpers.c b/unix/seg_helpers.c
new file mode 100644
index 0000000000..1684f7a8f8
--- /dev/null
+++ b/unix/seg_helpers.c
@@ -0,0 +1,38 @@
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2013, 2014 Damien P. George
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+/*
+  This is a stub used to create the symbols __bss_start and _end in a Mach-O object file.
+  Thoses are needed by the GC, and should point to the start and end of the bss section.
+  We reach this goal by linking this file last (putting _end at the end...), and using an 
+  order file (order.def) to move __bss_start at the start of bss.
+
+  TODO: Some pragma to do it inline ?
+*/
+
+char __bss_start = 0;
+char _end = 0;
+