The Has_Enough_Free_Memory was not correctly reporting a completely full
chunk in the case of a 0-sized allocation.
Tested on x86_64-pc-linux-gnu, committed on trunk
gcc/ada/
* libgnat/s-secsta.adb (Has_Enough_Free_Memory): Check for full
chunk before computing the available size.diff --git a/gcc/ada/libgnat/s-secsta.adb b/gcc/ada/libgnat/s-secsta.adb
--- a/gcc/ada/libgnat/s-secsta.adb
+++ b/gcc/ada/libgnat/s-secsta.adb
@@ -506,12 +506,17 @@ package body System.Secondary_Stack is
Mem_Size : Memory_Size) return Boolean
is
begin
+ -- First check if the chunk is full (Byte is > Memory'Last in that
+ -- case), then check there is enough free memory.
+
-- Byte - 1 denotes the last occupied byte. Subtracting that byte from
-- the memory capacity of the chunk yields the size of the free memory
-- within the chunk. The chunk can fit the request as long as the free
-- memory is as big as the request.
- return Chunk.Size - (Byte - 1) >= Mem_Size;
+ return Chunk.Memory'Last >= Byte
+ and then Chunk.Size - (Byte - 1) >= Mem_Size;
+
end Has_Enough_Free_Memory;
----------------------
