[BZ,19239] Don't include sys/sysmacros.h from sys/types.h.

Message ID 20180210181626.4431-1-zackw@panix.com
State New
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  • [BZ,19239] Don't include sys/sysmacros.h from sys/types.h.
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Commit Message

Zack Weinberg Feb. 10, 2018, 6:16 p.m.
This completes the deprecation and removal of this inclusion, which
was begun in the 2.25 release.

	* posix/sys/types.h: Don't include sys/sysmacros.h.
	* misc/sys/sysmacros.h: Remove the conditional deprecation
	warnings for the macros defined by this header.
 NEWS                 | 11 +++++++++++
 misc/sys/sysmacros.h | 52 +++-------------------------------------------------
 posix/sys/types.h    |  9 ---------
 3 files changed, 14 insertions(+), 58 deletions(-)


diff --git a/NEWS b/NEWS
index 56780313f50..60dd2f778d9 100644
--- a/NEWS
+++ b/NEWS
@@ -28,6 +28,17 @@  Deprecated and removed features, and other changes affecting compatibility:
    investigate using (f)getc_unlocked and (f)putc_unlocked, and, if
    necessary, flockfile and funlockfile.
+ * The macros 'major', 'minor', and 'makedev' are now only available from
+   the header <sys/sysmacros.h>; not from <sys/types.h> or various other
+   headers that happen to include <sys/types.h>.  These macros are rarely
+   used, not part of POSIX nor XSI, and their names frequently collide with
+   user code; see https://sourceware.org/bugzilla/show_bug.cgi?id=19239 for
+   further explanation.
+   <sys/sysmacros.h> is a GNU extension.  Portable programs that require
+   these macros should first include <sys/types.h>, and then include
+   <sys/sysmacros.h> if __GNU_LIBRARY__ is defined.
 Changes to build and runtime requirements:
   [Add changes to build and runtime requirements here]
diff --git a/misc/sys/sysmacros.h b/misc/sys/sysmacros.h
index ccc15e5b3cf..699e03865ff 100644
--- a/misc/sys/sysmacros.h
+++ b/misc/sys/sysmacros.h
@@ -16,23 +16,6 @@ 
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
-/* If <sys/sysmacros.h> is included after <sys/types.h>, these macros
-   will already be defined, and we need to redefine them without the
-   deprecation warnings.  (If they are included in the opposite order,
-   the outer #ifndef will suppress this entire file and the macros
-   will be usable without warnings.)  */
-#undef major
-#undef minor
-#undef makedev
-/* This is the macro that must be defined to satisfy the misuse check
-   in bits/sysmacros.h. */
 #define _SYS_SYSMACROS_H 1
@@ -40,27 +23,6 @@ 
 #include <bits/types.h>
 #include <bits/sysmacros.h>
-/* 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__;
-#endif /* _SYS_SYSMACROS_H */
@@ -97,14 +57,8 @@  __END_DECLS
-# 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)
-# define major(dev) gnu_dev_major (dev)
-# define minor(dev) gnu_dev_minor (dev)
-# define makedev(maj, min) gnu_dev_makedev (maj, min)
+#define major(dev) gnu_dev_major (dev)
+#define minor(dev) gnu_dev_minor (dev)
+#define makedev(maj, min) gnu_dev_makedev (maj, min)
 #endif /* sys/sysmacros.h */
diff --git a/posix/sys/types.h b/posix/sys/types.h
index e8d51a1342a..db524d6cd13 100644
--- a/posix/sys/types.h
+++ b/posix/sys/types.h
@@ -194,15 +194,6 @@  typedef int register_t __attribute__ ((__mode__ (__word__)));
 /* It also defines `fd_set' and the FD_* macros for `select'.  */
 # include <sys/select.h>
-/* BSD defines `major', `minor', and `makedev' in this header.
-   However, these symbols are likely to collide with user code, so we are
-   going to stop defining them here in an upcoming release.  Code that needs
-   these macros should include <sys/sysmacros.h> directly.  Code that does
-   not need these macros should #undef them after including this header.  */
-# include <sys/sysmacros.h>
 #endif /* Use misc.  */