* src/smooth/ftgrays.c: Fix compilation if `FT_LONG64` is undefined.

The code assumed that if `__SSE2__` is defined, then 64-bit integer
types are available.  This is not the case apparently for certain
multilib compiler targets like 'x86_32.x86' used by Gentoo.

This patch fixes the issue by disabling the special code path when
64-bit integer types are not available.

Fixes #1071.

ChangeLog

@@ -1,3 +1,16 @@
+2021-07-17  David Turner  <david@freetype.org>
+
+	* src/smooth/ftgrays.c: Fix compilation if `FT_LONG64` is undefined.
+
+	The code assumed that if `__SSE2__` is defined, then 64-bit integer
+	types are available.  This is not the case apparently for certain
+	multilib compiler targets like 'x86_32.x86' used by Gentoo.
+
+	This patch fixes the issue by disabling the special code path when
+	64-bit integer types are not available.
+
+	Fixes #1071.
+
 2021-07-16  Alex Richardson  <Alexander.Richardson@cl.cam.ac.uk>
 
 	[tests] Allow arbitrary build directories.
@@ -10,7 +23,7 @@
 
 	* tests/meson.build: Updated.
 
-2021-07-15  Alex Richardson  <Alexander.Richardson@cl.cam.ac.uk>
+2021-07-16  Alex Richardson  <Alexander.Richardson@cl.cam.ac.uk>
 
 	* tests/issue-1063/main.c (main): Fix uninitialized variable.
 

src/smooth/ftgrays.c

@@ -1018,6 +1018,16 @@ typedef ptrdiff_t  FT_PtrDist;
 #  define BEZIER_USE_DDA  0
 #endif
 
+  /*
+   * For now, the code that depends on `BEZIER_USE_DDA` requires `FT_Int64`
+   * to be defined.  If `FT_LONG64` is not defined, meaning there is no
+   * 64-bit type available, disable it to avoid compilation errors.  See for
+   * example https://gitlab.freedesktop.org/freetype/freetype/-/issues/1071.
+   */
+#if !defined( FT_LONG64 )
+#  undef BEZIER_USE_DDA
+#  define BEZIER_USE_DDA  0
+#endif
 
 #if BEZIER_USE_DDA