[PATCH] include: Define macro to ignore -Wdeprecated-declarations on GCC

[Tsukasa OI]

"-Wdeprecated-declarations" warning option can be helpful to track
deprecated function delarations but sometimes we need to disable this
warning for a good reason.

DIAGNOSTIC_IGNORE_DEPRECATED_DECLARATIONS is an existing macro but only
defined on Clang.  Since "-Wdeprecated-declarations" is also available on
GCC (>= 3.4.0), this commit adds equivalent definition as Clang.

__GNUC__ and __GNUC_MINOR__ are not checked because this header file seems
to assume GCC >= 4.6 (with "GCC diagnostic push/pop").

include/ChangeLog:

	* diagnostics.h (DIAGNOSTIC_IGNORE_DEPRECATED_DECLARATIONS):
	Define also on GCC.
---
 include/diagnostics.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/diagnostics.h b/include/diagnostics.h
index c1a2e8f520c..3a75f4e2719 100644
--- a/include/diagnostics.h
+++ b/include/diagnostics.h
@@ -78,6 +78,9 @@
 
 #elif defined (__GNUC__) /* GCC */
 
+# define DIAGNOSTIC_IGNORE_DEPRECATED_DECLARATIONS \
+  DIAGNOSTIC_IGNORE ("-Wdeprecated-declarations")
+
 # if __GNUC__ >= 7
 #  define DIAGNOSTIC_IGNORE_DEPRECATED_REGISTER \
    DIAGNOSTIC_IGNORE ("-Wregister")

base-commit: 2c02c72c62d2e9f590155561ebc54ca87bc10c2a
-- 
2.37.2