MDEV-31890: Remove COMPILE_FLAGS

The cmake configuration step is single-threaded and already consuming
too much time. We should not make it worse by adding invocations like
MY_CHECK_CXX_COMPILER_FLAG().

Let us prefer something that works on any supported version
of GCC (4.8.5 or later) or clang, as well as recent versions
of the Intel C compiler.

This replaces commit 1fde785

Author: dr-m

storage/innobase/CMakeLists.txt

@@ -359,12 +359,6 @@ IF(MSVC)
   TARGET_COMPILE_OPTIONS(innobase PRIVATE "/wd4065")
 ENDIF()
 
-MY_CHECK_CXX_COMPILER_FLAG(-Wno-unused-but-set-variable)
-IF(have_CXX__Wno_unused_but_set_variable)
-  ADD_COMPILE_FLAGS(pars/pars0grm.cc fts/fts0pars.cc
-    COMPILE_FLAGS "-Wno-unused-but-set-variable")
-ENDIF()
-
 IF(NOT (PLUGIN_INNOBASE STREQUAL DYNAMIC))
   ADD_SUBDIRECTORY(${CMAKE_SOURCE_DIR}/extra/mariabackup ${CMAKE_BINARY_DIR}/extra/mariabackup)
 ENDIF()

storage/innobase/fts/fts0pars.cc

@@ -83,15 +83,15 @@
 #include "fts0tlex.h"
 #include "fts0pars.h"
 #include <my_sys.h>
-
 extern	int fts_lexer(YYSTYPE*, fts_lexer_t*);
 extern	int fts_blexer(YYSTYPE*, yyscan_t);
 extern	int fts_tlexer(YYSTYPE*, yyscan_t);
-
-
-
+#ifdef __GNUC__
+# pragma GCC diagnostic ignored "-Wpragmas"
+# pragma GCC diagnostic ignored "-Wunknown-warning-option"
+# pragma GCC diagnostic ignored "-Wunused-but-set-variable"
+#endif
 extern int ftserror(const char* p);
-
 /* Required for reentrant parser */
 #define ftslex	fts_lexer
 

storage/innobase/fts/fts0pars.y

@@ -31,15 +31,15 @@ this program; if not, write to the Free Software Foundation, Inc.,
 #include "fts0tlex.h"
 #include "fts0pars.h"
 #include <my_sys.h>
-
 extern	int fts_lexer(YYSTYPE*, fts_lexer_t*);
 extern	int fts_blexer(YYSTYPE*, yyscan_t);
 extern	int fts_tlexer(YYSTYPE*, yyscan_t);
-
-
-
+#ifdef __GNUC__
+# pragma GCC diagnostic ignored "-Wpragmas"
+# pragma GCC diagnostic ignored "-Wunknown-warning-option"
+# pragma GCC diagnostic ignored "-Wunused-but-set-variable"
+#endif
 extern int ftserror(const char* p);
-
 /* Required for reentrant parser */
 #define ftslex	fts_lexer
 

storage/innobase/pars/pars0grm.cc

@@ -78,13 +78,13 @@ que_node_t */
 #include "que0types.h"
 #include "que0que.h"
 #include "row0sel.h"
-
-#if defined __GNUC__ && (!defined __clang_major__ || __clang_major__ > 11)
-#pragma GCC diagnostic ignored "-Wfree-nonheap-object"
+#ifdef __GNUC__
+# pragma GCC diagnostic ignored "-Wpragmas"
+# pragma GCC diagnostic ignored "-Wunknown-warning-option"
+# pragma GCC diagnostic ignored "-Wfree-nonheap-object"
+# pragma GCC diagnostic ignored "-Wunused-but-set-variable"
 #endif
-
 #define YYSTYPE que_node_t*
-
 /* #define __STDC__ */
 int
 yylex(void);

storage/innobase/pars/pars0grm.y

@@ -37,13 +37,13 @@ que_node_t */
 #include "que0types.h"
 #include "que0que.h"
 #include "row0sel.h"
-
-#if defined __GNUC__ && (!defined __clang_major__ || __clang_major__ > 11)
-#pragma GCC diagnostic ignored "-Wfree-nonheap-object"
+#ifdef __GNUC__
+# pragma GCC diagnostic ignored "-Wpragmas"
+# pragma GCC diagnostic ignored "-Wunknown-warning-option"
+# pragma GCC diagnostic ignored "-Wfree-nonheap-object"
+# pragma GCC diagnostic ignored "-Wunused-but-set-variable"
 #endif
-
 #define YYSTYPE que_node_t*
-
 /* #define __STDC__ */
 int
 yylex(void);