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0029151: GCC 7.1 warnings "this statement may fall through" [-Wimplicit-fallthrough=]

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New macro Standard_FALLTHROUGH is defined for use in a switch statement immediately before a case label, if code associated with the previous case label may fall through to that
next label (i.e. does not end with "break" or "return" etc.).
This macro indicates that the fall through is intentional and should not be diagnosed by a compiler that warns on fallthrough.

The macro is inserted in places that currently generate such warning message and where fallthrough is intentional.

Doxygen comments are provided for this and other macros in Standard_Macro.hxx.
This commit is contained in:
abv
2017-09-28 10:26:47 +03:00
parent e2b4dea253
commit b1811c1d2b
34 changed files with 573 additions and 359 deletions
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68
src/Standard/Standard_Macro.hxx
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@@ -12,13 +12,21 @@
// Alternatively, this file may be used under the terms of Open CASCADE
// commercial license or contractual agreement.
// Purpose: This file is intended to be the first file #included to any
// Open CASCADE source. It defines platform-specific pre-processor
// macros necessary for correct compilation of Open CASCADE code
//! @file
//! This file is intended to be the first file included to any
//! Open CASCADE source. It defines platform-specific pre-processor
//! macros necessary for correct compilation of Open CASCADE code.
#ifndef _Standard_Macro_HeaderFile
# define _Standard_Macro_HeaderFile
//! @def Standard_OVERRIDE
//! Should be used in declarations of virtual methods overriden in the
//! derived classes, to cause compilation error in the case if that virtual
//! function disappears or changes its signature in the base class.
//!
//! Expands to C++11 keyword "override" on compilers that are known to
//! suppot it; empty in other cases.
#if defined(__cplusplus) && (__cplusplus >= 201100L)
// part of C++11 standard
#define Standard_OVERRIDE override
@@ -29,16 +37,42 @@
#define Standard_OVERRIDE
#endif
// Macro for marking variables / functions as possibly unused
// so that compiler will not emit redundant "unused" warnings.
//! @def Standard_FALLTHROUGH
//! Should be used in a switch statement immediately before a case label,
//! if code associated with the previous case label may fall through to that
//! next label (i.e. does not end with "break" or "return" etc.).
//! This macro indicates that the fall through is intentional and should not be
//! diagnosed by a compiler that warns on fallthrough.
//!
//! Expands to C++17 attribute statement "[[fallthrough]];" on compilers that
//! declare support of C++17, or to "__attribute__((fallthrough));" on
//! GCC 7+.
#if defined(__cplusplus) && (__cplusplus >= 201703L)
// part of C++17 standard
#define Standard_FALLTHROUGH [[fallthrough]];
#elif defined(__GNUC__) && (__GNUC__ >= 7)
// gcc 7+
#define Standard_FALLTHROUGH __attribute__((fallthrough));
#else
#define Standard_FALLTHROUGH
#endif
//! @def Standard_UNUSED
//! Macro for marking variables / functions as possibly unused
//! so that compiler will not emit redundant "unused" warnings.
//!
//! Expands to "__attribute__((unused))" on GCC and CLang.
#if defined(__GNUC__) || defined(__clang__)
#define Standard_UNUSED __attribute__((unused))
#else
#define Standard_UNUSED
#endif
// Macro Standard_DEPRECATED("message") can be used to declare a method deprecated.
// If OCCT_NO_DEPRECATED is defined, Standard_DEPRECATED is defined empty.
//! @def Standard_DEPRECATED("message")
//! Can be used in declaration of a method or a class to mark it as deprecated.
//! Use of such method or class will cause compiler warning (if supported by
//! compiler and unless disabled).
//! If macro OCCT_NO_DEPRECATED is defined, Standard_DEPRECATED is defined empty.
#ifdef OCCT_NO_DEPRECATED
#define Standard_DEPRECATED(theMsg)
#else
@@ -53,9 +87,14 @@
#endif
#endif
// Disable warnings about deprecated features.
// This is useful for sections of code kept for backward compatibility and scheduled for removal.
//! @def Standard_DISABLE_DEPRECATION_WARNINGS
//! Disables warnings on use of deprecated features (see Standard_DEPRECATED),
//! from the current point till appearance of Standard_ENABLE_DEPRECATION_WARNINGS macro.
//! This is useful for sections of code kept for backward compatibility and scheduled for removal.
//!
//! @def Standard_ENABLE_DEPRECATION_WARNINGS
//! Enables warnings on use of deprecated features previously disabled by
//! Standard_DISABLE_DEPRECATION_WARNINGS.
#if defined(__ICL) || defined (__INTEL_COMPILER)
#define Standard_DISABLE_DEPRECATION_WARNINGS __pragma(warning(push)) __pragma(warning(disable:1478))
#define Standard_ENABLE_DEPRECATION_WARNINGS __pragma(warning(pop))
@@ -118,6 +157,11 @@
#endif
//! @def Standard_EXPORT
//! This macro should be used in declarations of public methods
//! to ensure that they are exported from DLL on Windows and thus
//! can be called from other (dependent) libraries or applications.
# if defined(_WIN32) && !defined(HAVE_NO_DLL)
//======================================================
@@ -181,7 +225,9 @@
# endif // __Standard_DLL
# endif // __Standard_API
// Support of Universal Windows Platform
//! @def OCCT_UWP
//! This macro is defined on Windows platform in the case if the code
//! is being compiled for UWP (Universal Windows Platform).
#if defined(WINAPI_FAMILY) && WINAPI_FAMILY == WINAPI_FAMILY_APP
#define OCCT_UWP
#else