[PATCH:x11proto] Add comments to Xfuncproto.h noting required xproto versions for each macro

[Alan Coopersmith]

Saves time trawling git logs to determine what to put in the call to
PKG_CHECK_MODULES in configure.ac when you start using one of these.

Signed-off-by: Alan Coopersmith <alan.coopersmith at oracle.com>
---
 Xfuncproto.h.in |   11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/Xfuncproto.h.in b/Xfuncproto.h.in
index 39ca3b2..0d7b8b7 100644
--- a/Xfuncproto.h.in
+++ b/Xfuncproto.h.in
@@ -75,12 +75,14 @@ in this Software without prior written authorization from The Open Group.
 #endif
 #endif /* _XFUNCPROTOBEGIN */
 
+/* Added in X11R6.9, so available in any version of modular xproto */
 #if defined(__GNUC__) && (__GNUC__ >= 4)
 # define _X_SENTINEL(x) __attribute__ ((__sentinel__(x)))
 #else
 # define _X_SENTINEL(x)
 #endif /* GNUC >= 4 */
 
+/* Added in X11R6.9, so available in any version of modular xproto */
 #if defined(__GNUC__) && (__GNUC__ >= 4) && !defined(__CYGWIN__)
 # define _X_EXPORT      __attribute__((visibility("default")))
 # define _X_HIDDEN      __attribute__((visibility("hidden")))
@@ -95,6 +97,7 @@ in this Software without prior written authorization from The Open Group.
 # define _X_INTERNAL
 #endif /* GNUC >= 4 */
 
+/* requires xproto >= 7.0.9 */
 #if defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 303)
 # define _X_LIKELY(x)   __builtin_expect(!!(x), 1)
 # define _X_UNLIKELY(x) __builtin_expect(!!(x), 0)
@@ -103,12 +106,14 @@ in this Software without prior written authorization from The Open Group.
 # define _X_UNLIKELY(x) (x)
 #endif
 
+/* Added in X11R6.9, so available in any version of modular xproto */
 #if defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 301)
 # define _X_DEPRECATED  __attribute__((deprecated))
 #else /* not gcc >= 3.1 */
 # define _X_DEPRECATED
 #endif
 
+/* requires xproto >= 7.0.17 */
 #if (defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 205)) \
 	|| (defined(__SUNPRO_C) && (__SUNPRO_C >= 0x590))
 # define _X_NORETURN __attribute((noreturn))
@@ -116,18 +121,21 @@ in this Software without prior written authorization from The Open Group.
 # define _X_NORETURN
 #endif /* GNUC  */
 
+/* Added in X11R6.9, so available in any version of modular xproto */
 #if defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 203)
 # define _X_ATTRIBUTE_PRINTF(x,y) __attribute__((__format__(__printf__,x,y)))
 #else /* not gcc >= 2.3 */
 # define _X_ATTRIBUTE_PRINTF(x,y)
 #endif
 
+/* requires xproto >= 7.0.22 */
 #if defined(__GNUC__) &&  ((__GNUC__ * 100 + __GNUC_MINOR__) >= 303)
 #define _X_NONNULL(args...)  __attribute__((nonnull(args)))
 #else
 #define _X_NONNULL(...)  /* */
 #endif
 
+/* requires xproto >= 7.0.22 */
 #if defined(__GNUC__) &&  ((__GNUC__ * 100 + __GNUC_MINOR__) >= 205)
 #define _X_UNUSED  __attribute__((__unused__))
 #else
@@ -135,6 +143,8 @@ in this Software without prior written authorization from The Open Group.
 #endif
 
 /* C99 keyword "inline" or equivalent extensions in pre-C99 compilers */
+/* requires xproto >= 7.0.9
+   (introduced in 7.0.8 but didn't support all compilers until 7.0.9) */
 #if defined(inline) /* assume autoconf set it correctly */ || \
    (defined(__STDC_VERSION__) && (__STDC_VERSION__ - 0 >= 199901L)) /* C99 */ || \
    (defined(__SUNPRO_C) && (__SUNPRO_C >= 0x550))
@@ -146,6 +156,7 @@ in this Software without prior written authorization from The Open Group.
 #endif
 
 /* C99 keyword "restrict" or equivalent extensions in pre-C99 compilers */
+/* requires xproto >= 7.0.21 */
 #ifndef _X_RESTRICT_KYWD
 # if defined(restrict) /* assume autoconf set it correctly */ || \
    (defined(__STDC_VERSION__) && (__STDC_VERSION__ - 0 >= 199901L)) /* C99 */
-- 
1.7.3.2