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authorTsukasa OI <research_trasio@irq.a4lg.com>2022-09-12 08:04:40 +0000
committerTsukasa OI <research_trasio@irq.a4lg.com>2022-09-22 10:53:24 +0000
commitd9fa9b7c3306008ee97140a3aafc56999d8cd2cd (patch)
treeb6eec8598f58800186a12427299815082c668f9b /include
parentc59ea02cc3cbc89cde1fcb72e4267b73cdaf7f55 (diff)
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include: Add macro to ignore -Wunused-but-set-variable
"-Wunused-but-set-variable" warning option can be helpful to track variables that are written but not read thereafter. But it can be harmful if some of the code is auto-generated and we have no ways to deal with it. The particular example is Bison-generated code. The new DIAGNOSTIC_IGNORE_UNUSED_BUT_SET_VARIABLE macro can be helpful on such cases. A typical use of this macro is to place this macro before the end of user prologues on Bison (.y) files. include/ChangeLog: * diagnostics.h (DIAGNOSTIC_IGNORE_UNUSED_BUT_SET_VARIABLE): New.
Diffstat (limited to 'include')
-rw-r--r--include/diagnostics.h14
1 files changed, 14 insertions, 0 deletions
diff --git a/include/diagnostics.h b/include/diagnostics.h
index dbe6288..4161dff 100644
--- a/include/diagnostics.h
+++ b/include/diagnostics.h
@@ -68,6 +68,11 @@
DIAGNOSTIC_IGNORE ("-Wuser-defined-warnings")
# endif
+# if __has_warning ("-Wunused-but-set-variable")
+# define DIAGNOSTIC_IGNORE_UNUSED_BUT_SET_VARIABLE \
+ DIAGNOSTIC_IGNORE ("-Wunused-but-set-variable")
+# endif
+
# define DIAGNOSTIC_ERROR_SWITCH \
DIAGNOSTIC_ERROR ("-Wswitch")
@@ -89,6 +94,11 @@
# define DIAGNOSTIC_IGNORE_FORMAT_NONLITERAL \
DIAGNOSTIC_IGNORE ("-Wformat-nonliteral")
+# if __GNUC__ >= 5
+# define DIAGNOSTIC_IGNORE_UNUSED_BUT_SET_VARIABLE \
+ DIAGNOSTIC_IGNORE ("-Wunused-but-set-variable")
+# endif
+
/* GCC 4.8's "diagnostic push/pop" seems broken when using this, -Wswitch
remains enabled at the error level even after a pop. Therefore, don't
use it for GCC < 5. */
@@ -130,6 +140,10 @@
# define DIAGNOSTIC_IGNORE_USER_DEFINED_WARNINGS
#endif
+#ifndef DIAGNOSTIC_IGNORE_UNUSED_BUT_SET_VARIABLE
+# define DIAGNOSTIC_IGNORE_UNUSED_BUT_SET_VARIABLE
+#endif
+
#ifndef DIAGNOSTIC_ERROR_SWITCH
# define DIAGNOSTIC_ERROR_SWITCH
#endif