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[BZ #19239] Issue deprecation warnings on macro expansion.

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By using __glibc_macro_warning instead of __attribute_deprecated__,
we get the deprecation warnings whenever the macros are expanded,
not just when they compile to a function call.  This is important
for unintentional uses like the test case in #19239 (C++ var(value)
initialization syntax, with a variable named "major").  It's also
simpler, because __REDIRECT is no longer required.

	* misc/sys/sysmacros.h (__SYSMACROS_DM, __SYSMACROS_DM1): New macros.
	(__SYSMACROS_DEPRECATION_MSG, __SYSMACROS_FST_DECL_TEMPL)
	(__SYSMACROS_FST_IMPL_TEMPL): Delete.
	(major, minor, makedev): Use __SYSMACROS_DM in definition, instead
	of redirected function names.

	* misc/sys/cdefs.h (__glibc_macro_warning): Activate for clang >= 3.5
	as well.  Document that MESSAGE must be a single string literal.
This commit is contained in:
Zack Weinberg 2016-11-14 08:34:59 -05:00
parent 14f95a4203
commit 809b72df6c
3 changed files with 39 additions and 35 deletions
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11
ChangeLog
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@ -1,3 +1,14 @@
2016-11-14 Zack Weinberg <zackw@panix.com>
* misc/sys/sysmacros.h (__SYSMACROS_DM, __SYSMACROS_DM1): New macros.
(__SYSMACROS_DEPRECATION_MSG, __SYSMACROS_FST_DECL_TEMPL)
(__SYSMACROS_FST_IMPL_TEMPL): Delete.
(major, minor, makedev): Use __SYSMACROS_DM in definition, instead
of redirected function names.
* misc/sys/cdefs.h (__glibc_macro_warning): Activate for clang >= 3.5
as well. Document that MESSAGE must be a single string literal.
2016-11-11 Joseph Myers <joseph@codesourcery.com>
* scripts/build-many-glibcs.py: New file.

7
misc/sys/cdefs.h
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@ -473,8 +473,11 @@
#endif
/* __glibc_macro_warning (MESSAGE) issues warning MESSAGE. This is
intended for use in preprocessor macros. */
#if __GNUC_PREREQ (4,8)
intended for use in preprocessor macros.
Note: MESSAGE must be a _single_ string; concatenation of string
literals is not supported. */
#if __GNUC_PREREQ (4,8) || __glibc_clang_prereq (3,5)
# define __glibc_macro_warning1(message) _Pragma (#message)
# define __glibc_macro_warning(message) \
__glibc_macro_warning1 (GCC warning message)

56
misc/sys/sysmacros.h
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@ -40,54 +40,46 @@
#include <bits/types.h>
#include <bits/sysmacros.h>
/* The extra "\n " moves gcc's [-Wdeprecated-declarations] annotation
onto the next line. */
#define __SYSMACROS_DEPRECATION_MSG(symbol) \
"\n In the GNU C Library, `" #symbol "' is defined by <sys/sysmacros.h>." \
"\n For historical compatibility, it is currently defined by" \
"\n <sys/types.h> as well, but we plan to remove this soon." \
"\n To use `" #symbol "', include <sys/sysmacros.h> directly." \
"\n If you did not intend to use a system-defined macro `" #symbol "'," \
"\n you should #undef it after including <sys/types.h>." \
"\n "
/* Caution: The text of this deprecation message is unquoted, so that
#symbol can be substituted. (It is converted to a string by
__SYSMACROS_DM1.) This means the message must be a sequence of
complete pp-tokens; in particular, English contractions (it's,
can't) cannot be used.
The message has been manually word-wrapped to fit in 80 columns
when output by GCC 5 and 6. The first line is shorter to leave
some room for the "foo.c:23: warning:" annotation. */
#define __SYSMACROS_DM(symbol) __SYSMACROS_DM1 \
(In the GNU C Library, #symbol is defined\n\
by <sys/sysmacros.h>. For historical compatibility, it is\n\
currently defined by <sys/types.h> as well, but we plan to\n\
remove this soon. To use #symbol, include <sys/sysmacros.h>\n\
directly. If you did not intend to use a system-defined macro\n\
#symbol, you should undefine it after including <sys/types.h>.)
/* This macro is variadic because the deprecation message above
contains commas. */
#define __SYSMACROS_DM1(...) __glibc_macro_warning (#__VA_ARGS__)
#define __SYSMACROS_DECL_TEMPL(rtype, name, proto) \
extern rtype gnu_dev_##name proto __THROW __attribute_const__;
#define __SYSMACROS_FST_DECL_TEMPL(rtype, name, proto) \
extern rtype __REDIRECT_NTH (__##name##_from_sys_types, proto, \
gnu_dev_##name) \
__attribute_const__ \
__attribute_deprecated_msg__ (__SYSMACROS_DEPRECATION_MSG (name));
#define __SYSMACROS_IMPL_TEMPL(rtype, name, proto) \
__extension__ __extern_inline __attribute_const__ rtype \
__NTH (gnu_dev_##name proto)
#define __SYSMACROS_FST_IMPL_TEMPL(rtype, name, proto) \
__extension__ __extern_inline __attribute_const__ rtype \
__NTH (__##name##_from_sys_types proto)
__BEGIN_DECLS
__SYSMACROS_DECLARE_MAJOR (__SYSMACROS_DECL_TEMPL)
__SYSMACROS_DECLARE_MINOR (__SYSMACROS_DECL_TEMPL)
__SYSMACROS_DECLARE_MAKEDEV (__SYSMACROS_DECL_TEMPL)
__SYSMACROS_DECLARE_MAJOR (__SYSMACROS_FST_DECL_TEMPL)
__SYSMACROS_DECLARE_MINOR (__SYSMACROS_FST_DECL_TEMPL)
__SYSMACROS_DECLARE_MAKEDEV (__SYSMACROS_FST_DECL_TEMPL)
#ifdef __USE_EXTERN_INLINES
__SYSMACROS_DEFINE_MAJOR (__SYSMACROS_IMPL_TEMPL)
__SYSMACROS_DEFINE_MINOR (__SYSMACROS_IMPL_TEMPL)
__SYSMACROS_DEFINE_MAKEDEV (__SYSMACROS_IMPL_TEMPL)
__SYSMACROS_DEFINE_MAJOR (__SYSMACROS_FST_IMPL_TEMPL)
__SYSMACROS_DEFINE_MINOR (__SYSMACROS_FST_IMPL_TEMPL)
__SYSMACROS_DEFINE_MAKEDEV (__SYSMACROS_FST_IMPL_TEMPL)
#endif
__END_DECLS
@ -96,9 +88,7 @@ __END_DECLS
#ifndef __SYSMACROS_NEED_IMPLEMENTATION
# undef __SYSMACROS_DECL_TEMPL
# undef __SYSMACROS_FST_DECL_TEMPL
# undef __SYSMACROS_IMPL_TEMPL
# undef __SYSMACROS_FST_IMPL_TEMPL
# undef __SYSMACROS_DECLARE_MAJOR
# undef __SYSMACROS_DECLARE_MINOR
# undef __SYSMACROS_DECLARE_MAKEDEV
@ -108,9 +98,9 @@ __END_DECLS
#endif
#ifdef __SYSMACROS_DEPRECATED_INCLUSION
# define major(dev) __major_from_sys_types (dev)
# define minor(dev) __minor_from_sys_types (dev)
# define makedev(maj, min) __makedev_from_sys_types (maj, min)
# define major(dev) __SYSMACROS_DM (major) gnu_dev_major (dev)
# define minor(dev) __SYSMACROS_DM (minor) gnu_dev_minor (dev)
# define makedev(maj, min) __SYSMACROS_DM (makedev) gnu_dev_makedev (maj, min)
#else
# define major(dev) gnu_dev_major (dev)
# define minor(dev) gnu_dev_minor (dev)