+2011-02-12 Paul Eggert <eggert@cs.ucla.edu>
+
+ stdlib: support non-GCC __attribute__
+
+ Fix a serious and tricky problem encountered when attempting to
+ add the getloadavg module to Emacs. Emacs worked fine on RHEL
+ 5.5, but it crashed due to memory corruption on Solaris 10 with
+ Sun C 5.11. Emacs normally ORs 3-bit tags into their low-order
+ bits that are otherwise zero. This tagging is optional inside
+ Emacs but is preferred and is used when __attribute__ ((__aligned
+ (8))) works, as it does with both recent-enough GCC and with Sun C
+ 5.11. However, Sun C 5.11 is not GCC and does not #define
+ __GNUC__ and __GNUC_MINOR__.
+
+ When I added the getloadavg module to Emacs, it brought in
+ stdlib.in.h, which contained this fragment:
+
+ #ifndef __attribute__
+ # if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8)
+ # define __attribute__(Spec) /* empty */
+ # endif
+ #endif
+
+ When files that include <stdlib.h> were compiled with Sun C 5.11,
+ the above code disabled __attribute__ ((__aligned (8))), which
+ caused variables to not be properly aligned, which eventually led
+ to the pointer corruption mentioned above. (This was a bit hard
+ to diagnose, unfortunately.)
+
+ Several "#define __attribute__(X) /* empty */" code snippets need
+ to be eradicated from Gnulib to work with non-GCC compilers that
+ support __attribute__. The Autoconf way to do this is to test for
+ each kind of attribute that we want support for, and selectively
+ enable that in source code.
+
+ Fix this problem just for stdlib.h, by adding a test for the
+ __noreturn__ attribute, and change stdlib.in.h to use that test
+ when needed. This technique can be easily generalized to the
+ other *.in.h files and attributes, and a similar technique can be
+ used for *.h and *.c files. This patch is enough to solve the
+ problem for Emacs + getloadavg, and I thought I'd publish it for
+ feedback before undertaking further, similar fixes in other
+ modules.
+
+ This patch does not arrange to #define HAVE_ATTRIBUTE_NORETURN
+ because it's not needed for stdlib.h. It merely substitutes the
+ value directly into stdlib.h. We may well need to #define it, or
+ similar symbols, for other modules, but it's nice to also have an
+ option to not #define it for applications like Emacs that do not
+ need it.
+
+ * lib/stdlib.in.h (__attribute__): Do not #define.
+ (_GL_ATTRIBUTE_NORETURN): New macro, which in stdlib.h needs to
+ be defined only if the _Exit module is also used.
+ * m4/_Exit.m4 (gl_FUNC__EXIT): Require gl_ATTRIBUTE_NORETURN.
+ * m4/stdlib_h.m4 (gl_STDLIB_H_DEFAULTS): Subst
+ HAVE_ATTRIBUTE_NORETURN and default it to 1, its value on GNU
+ platforms.
+ * modules/_Exit (Files): Add m4/attribute.m4.
+ * modules/stdlib (Makefile.am): Substitute HAVE_ATTRIBUTE_NORETURN.
+ * m4/attribute.m4: New file.
+
+2011-02-12 Bruno Haible <bruno@clisp.org>
+
+ wcsrtombs: Work around bug on native Windows.
+ * m4/wcsrtombs.m4 (gl_WCSRTOMBS_NULL): Test against mingw bug.
+ * lib/wcsrtombs.c (rpl_wcsrtombs): When dest is NULL, pass SIZE_MAX
+ instead of len.
+ * doc/posix-functions/wcsrtombs.texi: Document mingw bug.
+
+2011-02-12 Bruno Haible <bruno@clisp.org>
+
+ mbsrtowcs: Work around bug on native Windows.
+ * m4/mbsrtowcs.m4 (gl_MBSRTOWCS_WORKS): Require gt_LOCALE_FR. Test
+ against mingw bug.
+ * doc/posix-functions/mbsrtowcs.texi: Document mingw bug.
+
+2011-02-11 Thien-Thi Nguyen <ttn@gnuvola.org>
+
+ doc: update users.txt
+ * users.txt: Add rcs.
+
+2011-02-10 John W. Eaton <jwe@gnu.org>
+
+ doc: update users.txt
+ * users.txt: Add octave.
+
+2011-02-10 Jim Meyering <meyering@redhat.com>
+
+ doc: update users.txt
+ * users.txt: Add iwhd.
+
+2011-02-09 Bruno Haible <bruno@clisp.org>
+
+ gnulib-tool: Make copyright notice adjustment more robust.
+ * gnulib-tool (func_import): In sed_transform_main_lib_file,
+ sed_transform_build_aux_file, sed_transform_testsrelated_lib_file,
+ allow a line break to occur after "GNU" in "GNU [Lesser] General Public
+ License".
+ Reported by Glenn Morris <rgm@gnu.org> via Paul Eggert.
+
+2011-02-06 Bruno Haible <bruno@clisp.org>
+
+ New module 'towctrans'.
+ * modules/towctrans: New file.
+ * lib/wctype.in.h (towctrans): New declaration.
+ * lib/towctrans.c: New file.
+ * lib/towctrans-impl.h: New file.
+ * m4/towctrans.m4: New file.
+ * m4/wctype_h.m4 (gl_WCTYPE_H): Test whether towctrans is declared.
+ (gl_WCTYPE_H_DEFAULTS): Initialize GNULIB_TOWCTRANS.
+ * modules/wctype-h (Makefile.am): Substitute GNULIB_TOWCTRANS.
+ * tests/test-wctype-h-c++.cc: Test the declaration of towctrans.
+ * doc/posix-functions/towctrans.texi: Mention the new module.
+
+2011-02-06 Bruno Haible <bruno@clisp.org>
+
+ New module 'wctrans'.
+ * modules/wctrans: New file.
+ * lib/wctype.in.h (wctrans): New declaration.
+ * lib/wctrans.c: New file.
+ * lib/wctrans-impl.h: New file.
+ * m4/wctrans.m4: New file.
+ * m4/wctype_h.m4 (gl_WCTYPE_H): Test whether wctrans is declared.
+ (gl_WCTYPE_H_DEFAULTS): Initialize GNULIB_WCTRANS.
+ * modules/wctype-h (Makefile.am): Substitute GNULIB_WCTRANS.
+ * tests/test-wctype-h-c++.cc: Test the declaration of wctrans.
+ * doc/posix-functions/wctrans.texi: Mention the new module.
+
2011-02-06 Bruno Haible <bruno@clisp.org>
New module 'iswctype'.
projects / gnulib.git / blobdiff