[freetype2] GSoC-2020-anuj ed49fac: [sdf] Bug fix.

[Anuj Verma]

branch: GSoC-2020-anuj
commit ed49facfe0840bc71f9dab885540d24cc43ebc68
Author: Anuj Verma <anujv@iitbhilai.ac.in>
Commit: Anuj Verma <anujv@iitbhilai.ac.in>

    [sdf] Bug fix.
    
    * src/sdf/ftsdf.c (*): Only track memory when `FT_DEBUG_MEMORY' is defined. 
Some
      variables used internally by the freetype memory debugger are only 
defined when
      we are tracking memory. If `FT_DEBUG_MEMORY' is not defined those variable
      are not defined and we get undefined reference error.
---
 src/sdf/ftsdf.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/sdf/ftsdf.c b/src/sdf/ftsdf.c
index 1b9d33b..3254db9 100644
--- a/src/sdf/ftsdf.c
+++ b/src/sdf/ftsdf.c
@@ -83,7 +83,10 @@
    *
    */
 
-#ifdef FT_DEBUG_LEVEL_TRACE
+/* The memory tracker only works when `FT_DEBUG_MEMORY' is defined  */
+/* because some variables such as `_ft_debug_file' are defined when */
+/* `FT_DEBUG_MEMORY' is defined.                                    */
+#if defined(FT_DEBUG_LEVEL_TRACE) && defined(FT_DEBUG_MEMORY)
 
   #undef FT_DEBUG_INNER
   #undef FT_ASSIGNP_INNER