* [Bug c++/53531] <,,,,> accepted as template arguments for variadic template
2012-05-30 16:29 [Bug c++/53531] New: <,,,,> accepted as template arguments for variadic template redi at gcc dot gnu.org
@ 2012-07-10 10:37 ` niels at penneman dot org
2012-07-10 11:01 ` redi at gcc dot gnu.org
` (4 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: niels at penneman dot org @ 2012-07-10 10:37 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53531
Niels Penneman <niels at penneman dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |niels at penneman dot org
--- Comment #1 from Niels Penneman <niels at penneman dot org> 2012-07-10 10:37:34 UTC ---
Exactly the same behavior with both 4.6.3 and 4.7.1
Similar test case below. Adding a trailing comma to a list of template
arguments breaks the code but compiles successfully and without warnings. A
trailing comma in a template list of for instance boost::mpl::vector will make
the vector "empty".
#########################
template <typename ... Ts>
struct S;
template <typename T, typename ... Ts>
struct S<T, Ts ...> { static constexpr int count = S<Ts ...>::count + 1; };
template <typename T>
struct S<T> { static constexpr int count = 1; };
int main()
{
return S<char, int, long,>::count;
}
#########################
$ g++ -v
Using built-in specs.
COLLECT_GCC=/usr/x86_64-pc-linux-gnu/gcc-bin/4.6.3/g++
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-pc-linux-gnu/4.6.3/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /var/tmp/portage/sys-devel/gcc-4.6.3/work/gcc-4.6.3/configure
--prefix=/usr --bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/4.6.3
--includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/4.6.3/include
--datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.6.3
--mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.6.3/man
--infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.6.3/info
--with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/4.6.3/include/g++-v4
--host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --disable-altivec
--disable-fixed-point --with-ppl --with-cloog --disable-ppl-version-check
--with-cloog-include=/usr/include/cloog-ppl --enable-lto --enable-nls
--without-included-gettext --with-system-zlib --enable-obsolete
--disable-werror --enable-secureplt --enable-multilib --disable-libmudflap
--disable-libssp --enable-libgomp
--with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/4.6.3/python
--enable-checking=release --disable-libgcj --disable-libquadmath
--enable-languages=c,c++ --enable-shared --enable-threads=posix
--enable-__cxa_atexit --enable-clocale=gnu --enable-targets=all
--with-bugurl=http://bugs.gentoo.org/ --with-pkgversion='Gentoo 4.6.3 p1.3,
pie-0.5.2'
Thread model: posix
gcc version 4.6.3 (Gentoo 4.6.3 p1.3, pie-0.5.2)
$ g++ -v
Using built-in specs.
COLLECT_GCC=/usr/x86_64-pc-linux-gnu/gcc-bin/4.7.1/g++
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-pc-linux-gnu/4.7.1/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /var/tmp/portage/sys-devel/gcc-4.7.1/work/gcc-4.7.1/configure
--prefix=/usr --bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/4.7.1
--includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.1/include
--datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.7.1
--mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.7.1/man
--infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.7.1/info
--with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.1/include/g++-v4
--host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --disable-altivec
--disable-fixed-point --with-ppl --with-cloog --disable-ppl-version-check
--with-cloog-include=/usr/include/cloog-ppl --enable-lto --enable-nls
--without-included-gettext --with-system-zlib --enable-obsolete
--disable-werror --enable-secureplt --enable-multilib
--with-multilib-list=m32,m64 --disable-libmudflap --disable-libssp
--enable-libgomp
--with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/4.7.1/python
--enable-checking=release --disable-libgcj --disable-libquadmath
--enable-languages=c,c++ --enable-shared --enable-threads=posix
--enable-__cxa_atexit --enable-clocale=gnu --enable-targets=all
--with-bugurl=http://bugs.gentoo.org/ --with-pkgversion='Gentoo 4.7.1 p1.0,
pie-0.5.3'
Thread model: posix
gcc version 4.7.1 (Gentoo 4.7.1 p1.0, pie-0.5.3)
#########################
Command: g++ -Wall -Wextra -std=c++0x undef.cpp
Output: none, completes succesfully
Command: ./a.out ; echo $?
Output: 0
When omitting the trailing comma, return status of compiled application is 3 as
expected.
^ permalink raw reply [flat|nested] 7+ messages in thread* [Bug c++/53531] <,,,,> accepted as template arguments for variadic template
2012-05-30 16:29 [Bug c++/53531] New: <,,,,> accepted as template arguments for variadic template redi at gcc dot gnu.org
2012-07-10 10:37 ` [Bug c++/53531] " niels at penneman dot org
@ 2012-07-10 11:01 ` redi at gcc dot gnu.org
2012-07-10 12:58 ` jason at gcc dot gnu.org
` (3 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: redi at gcc dot gnu.org @ 2012-07-10 11:01 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53531
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jason at gcc dot gnu.org
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-07-10 11:01:40 UTC ---
It's now rejected on trunk:
c.cc:3:15: error: template argument 1 is invalid
int i = S<,,,,>::undefined;
^
c.cc:3:15: error: template argument 2 is invalid
c.cc:3:15: error: template argument 3 is invalid
c.cc:3:15: error: template argument 4 is invalid
c.cc:3:15: error: template argument 5 is invalid
(I might have been using an older 4.8 snapshot when I reported the bug, not
sure now.)
Jason, any idea which patch fixed these cases and if we need anything in the
testsuite to prevent regressions before closing it?
^ permalink raw reply [flat|nested] 7+ messages in thread* [Bug c++/53531] <,,,,> accepted as template arguments for variadic template
2012-05-30 16:29 [Bug c++/53531] New: <,,,,> accepted as template arguments for variadic template redi at gcc dot gnu.org
2012-07-10 10:37 ` [Bug c++/53531] " niels at penneman dot org
2012-07-10 11:01 ` redi at gcc dot gnu.org
@ 2012-07-10 12:58 ` jason at gcc dot gnu.org
2012-07-10 13:03 ` redi at gcc dot gnu.org
` (2 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: jason at gcc dot gnu.org @ 2012-07-10 12:58 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53531
--- Comment #3 from Jason Merrill <jason at gcc dot gnu.org> 2012-07-10 12:58:25 UTC ---
(In reply to comment #2)
> Jason, any idea which patch fixed these cases and if we need anything in the
> testsuite to prevent regressions before closing it?
Nothing springs to mind. grep ,, variadic* doesn't get any hits, so adding a
testcase wouldn't hurt.
^ permalink raw reply [flat|nested] 7+ messages in thread* [Bug c++/53531] <,,,,> accepted as template arguments for variadic template
2012-05-30 16:29 [Bug c++/53531] New: <,,,,> accepted as template arguments for variadic template redi at gcc dot gnu.org
` (2 preceding siblings ...)
2012-07-10 12:58 ` jason at gcc dot gnu.org
@ 2012-07-10 13:03 ` redi at gcc dot gnu.org
2012-07-13 7:53 ` redi at gcc dot gnu.org
2012-07-13 7:55 ` redi at gcc dot gnu.org
5 siblings, 0 replies; 7+ messages in thread
From: redi at gcc dot gnu.org @ 2012-07-10 13:03 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53531
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2012-07-10
AssignedTo|unassigned at gcc dot |redi at gcc dot gnu.org
|gnu.org |
Ever Confirmed|0 |1
--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-07-10 13:03:09 UTC ---
OK, thanks, I'll do that.
I tried reverting the patch for PR 47220 but that wasn't it, and I didn't look
any further.
^ permalink raw reply [flat|nested] 7+ messages in thread* [Bug c++/53531] <,,,,> accepted as template arguments for variadic template
2012-05-30 16:29 [Bug c++/53531] New: <,,,,> accepted as template arguments for variadic template redi at gcc dot gnu.org
` (3 preceding siblings ...)
2012-07-10 13:03 ` redi at gcc dot gnu.org
@ 2012-07-13 7:53 ` redi at gcc dot gnu.org
2012-07-13 7:55 ` redi at gcc dot gnu.org
5 siblings, 0 replies; 7+ messages in thread
From: redi at gcc dot gnu.org @ 2012-07-13 7:53 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53531
--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-07-13 07:53:21 UTC ---
Author: redi
Date: Fri Jul 13 07:53:12 2012
New Revision: 189452
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=189452
Log:
PR c++/53531
* testsuite/g++.dg/cpp0x/variadic135.C: New.
Added:
trunk/gcc/testsuite/g++.dg/cpp0x/variadic135.C
Modified:
trunk/gcc/testsuite/ChangeLog
^ permalink raw reply [flat|nested] 7+ messages in thread* [Bug c++/53531] <,,,,> accepted as template arguments for variadic template
2012-05-30 16:29 [Bug c++/53531] New: <,,,,> accepted as template arguments for variadic template redi at gcc dot gnu.org
` (4 preceding siblings ...)
2012-07-13 7:53 ` redi at gcc dot gnu.org
@ 2012-07-13 7:55 ` redi at gcc dot gnu.org
5 siblings, 0 replies; 7+ messages in thread
From: redi at gcc dot gnu.org @ 2012-07-13 7:55 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53531
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution| |FIXED
Target Milestone|--- |4.8.0
Known to fail| |4.6.3, 4.7.1
--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-07-13 07:54:37 UTC ---
Fixed on trunk
^ permalink raw reply [flat|nested] 7+ messages in thread