4 files changed, 20 insertions, 4 deletions
diff --git a/src/glx/x11/indirect.c b/src/glx/x11/indirect.c
index 35be63f36e..2a4db6578a 100644
--- a/src/glx/x11/indirect.c
+++ b/src/glx/x11/indirect.c
@@ -39,7 +39,11 @@
 
 #define __GLX_PAD(n) (((n) + 3) & ~3)
 
-#define FASTCALL
+#  if defined(__i386__) && defined(__GNUC__) && !defined(__CYGWIN__) && !defined(__MINGW32__)
+#    define FASTCALL __attribute__((fastcall))
+#  else
+#    define FASTCALL
+#  endif
 #  if defined(__GNUC__)
 #    define NOINLINE __attribute__((noinline))
 #  else
diff --git a/src/glx/x11/indirect.h b/src/glx/x11/indirect.h
index fd5cbf1edb..1c45fa28a4 100644
--- a/src/glx/x11/indirect.h
+++ b/src/glx/x11/indirect.h
@@ -42,7 +42,11 @@
 #  else
 #    define HIDDEN
 #  endif
-#define FASTCALL
+#  if defined(__i386__) && defined(__GNUC__) && !defined(__CYGWIN__) && !defined(__MINGW32__)
+#    define FASTCALL __attribute__((fastcall))
+#  else
+#    define FASTCALL
+#  endif
 #  if defined(__GNUC__)
 #    define NOINLINE __attribute__((noinline))
 #  else
diff --git a/src/glx/x11/indirect_size.c b/src/glx/x11/indirect_size.c
index aa5ed752a5..79d57d55b6 100644
--- a/src/glx/x11/indirect_size.c
+++ b/src/glx/x11/indirect_size.c
@@ -35,7 +35,11 @@
 #    define PURE
 #  endif
 
-#define FASTCALL
+#  if defined(__i386__) && defined(__GNUC__) && !defined(__CYGWIN__) && !defined(__MINGW32__)
+#    define FASTCALL __attribute__((fastcall))
+#  else
+#    define FASTCALL
+#  endif
 
 #  if (__GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 3)) && defined(__ELF__)
 #    define INTERNAL  __attribute__((visibility("internal")))
diff --git a/src/glx/x11/indirect_size.h b/src/glx/x11/indirect_size.h
index c3f353dbf4..9ba0bd6907 100644
--- a/src/glx/x11/indirect_size.h
+++ b/src/glx/x11/indirect_size.h
@@ -42,7 +42,11 @@
 #    define PURE
 #  endif
 
-#define FASTCALL
+#  if defined(__i386__) && defined(__GNUC__) && !defined(__CYGWIN__) && !defined(__MINGW32__)
+#    define FASTCALL __attribute__((fastcall))
+#  else
+#    define FASTCALL
+#  endif
 
 #  if (__GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 3)) && defined(__ELF__)
 #    define INTERNAL  __attribute__((visibility("internal")))