The following code reproduces the Example in n3092 (FCD) 5.1.2/8, complete with
the comments given there:
14:36:12 Paul bibbi...@jijou
/cygdrive/d/CPPProjects/nano/gcc_bugs $cat _5_1_2_8.cpp
// file: _5_1_2_8.cpp
struct S2 { void f(int i); };
void S2::f(int i) {
[&, i]{ }; // OK
[&, &i]{ }; // error: i preceded by & when & is the default
[=, this]{ }; // error: this when = is the default
// [i, i]{ }; // error: i repeated
}
The fourth lambda-expression has been commented out to reflect the fact that
gcc-4.5.0 correctly handles this as an error. The second and third - which
should be errors according 5.1.2/8 - are left uncommented. gcc-4.5.0 compiles
this code without issuing an error, thus not handling the following from
5.1.2/8 correctly:
- "If a lambda-capture includes a capture-default that is &, the identifiers
in the lambda capture shall not be preceded by &"; and
- "If a lambda-capture includes a capture-default that is =, the lambda
capture shall not contain this."
14:33:29 Paul bibbi...@jijou
/cygdrive/d/CPPProjects/nano/gcc_bugs $make
i686-pc-cygwin-gcc-4.5.0 -v -save-temps -Wall -std=c++0x -pedantic -c
_5_1_2_8.cpp
Using built-in specs.
COLLECT_GCC=i686-pc-cygwin-gcc-4.5.0
COLLECT_LTO_WRAPPER=/opt/gcc-4.5.0/libexec/gcc/i686-pc-cygwin/4.5.0/lto-wrapper.exe
Target: i686-pc-cygwin
Configured with: ./configure --prefix=/opt/gcc-4.5.0 --enable-bootstrap
--enable-version-specific-runtime-libs --enable-static --enable-shared
--enable-shared-libgcc --disable-__cxa_atexit --with-gnu-ld --with-gnu-as
--with-dwarf2 --disable-sjlj-exceptions --enable-languages=c,c++
--disable-symvers --enable-libgomp --enable-libssp --enable-threads=posix
--with-arch-i686 --with-tune=generic
Thread model: posix
gcc version 4.5.0 (GCC)
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-Wall' '-std=c++0x' '-pedantic' '-c'
'-mtune=generic' '-march=pentiumpro'
/opt/gcc-4.5.0/libexec/gcc/i686-pc-cygwin/4.5.0/cc1plus.exe -E -quiet -v
-D__CYGWIN32__ -D__CYGWIN__ -Dunix -D__unix__ -D__unix -idirafter
/usr/lib/../include/w32api -idirafter ../../include/w32api _5_1_2_8.cpp
-mtune=generic -march=pentiumpro -std=c++0x -Wall -pedantic -fpch-preprocess -o
_5_1_2_8.ii
ignoring nonexistent directory
"/opt/gcc-4.5.0/lib/gcc/i686-pc-cygwin/4.5.0/../../../../i686-pc-cygwin/include"
ignoring nonexistent directory "../../include/w32api"
#include "..." search starts here:
#include <...> search starts here:
/opt/gcc-4.5.0/lib/gcc/i686-pc-cygwin/4.5.0/include/c++
/opt/gcc-4.5.0/lib/gcc/i686-pc-cygwin/4.5.0/include/c++/i686-pc-cygwin
/opt/gcc-4.5.0/lib/gcc/i686-pc-cygwin/4.5.0/include/c++/backward
/usr/local/include
/opt/gcc-4.5.0/include
/opt/gcc-4.5.0/lib/gcc/i686-pc-cygwin/4.5.0/include
/opt/gcc-4.5.0/lib/gcc/i686-pc-cygwin/4.5.0/include-fixed
/usr/include
/usr/lib/../include/w32api
End of search list.
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-Wall' '-std=c++0x' '-pedantic' '-c'
'-mtune=generic' '-march=pentiumpro'
/opt/gcc-4.5.0/libexec/gcc/i686-pc-cygwin/4.5.0/cc1plus.exe -fpreprocessed
_5_1_2_8.ii -quiet -dumpbase _5_1_2_8.cpp -mtune=generic -march=pentiumpro
-auxbase _5_1_2_8 -Wall -pedantic -std=c++0x -version -o _5_1_2_8.s
GNU C++ (GCC) version 4.5.0 (i686-pc-cygwin)
compiled by GNU C version 4.5.0, GMP version 4.3.2, MPFR version 2.4.1,
MPC version 0.8.1
warning: GMP header version 4.3.2 differs from library version 4.3.1.
warning: MPFR header version 2.4.1 differs from library version 2.4.1-p5.
warning: MPC header version 0.8.1 differs from library version 0.8.
GGC heuristics: --param ggc-min-expand=99 --param ggc-min-heapsize=129712
GNU C++ (GCC) version 4.5.0 (i686-pc-cygwin)
compiled by GNU C version 4.5.0, GMP version 4.3.2, MPFR version 2.4.1,
MPC version 0.8.1
warning: GMP header version 4.3.2 differs from library version 4.3.1.
warning: MPFR header version 2.4.1 differs from library version 2.4.1-p5.
warning: MPC header version 0.8.1 differs from library version 0.8.
GGC heuristics: --param ggc-min-expand=99 --param ggc-min-heapsize=129712
Compiler executable checksum: 81a7a49c1fa28713ff621b6b856147c0
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-Wall' '-std=c++0x' '-pedantic' '-c'
'-mtune=generic' '-march=pentiumpro'
as -v -o _5_1_2_8.o _5_1_2_8.s
GNU assembler version 2.20.51 (i686-cygwin) using BFD version (GNU Binutils)
2.20.51.20100410
COMPILER_PATH=/opt/gcc-4.5.0/libexec/gcc/i686-pc-cygwin/4.5.0/:/opt/gcc-4.5.0/libexec/gcc/i686-pc-cygwin/4.5.0/:/opt/gcc-4.5.0/libexec/gcc/i686-pc-cygwin/:/opt/gcc-4.5.0/lib/gcc/i686-pc-cygwin/4.5.0/:/opt/gcc-4.5.0/lib/gcc/i686-pc-cygwin/
LIBRARY_PATH=/opt/gcc-4.5.0/lib/gcc/i686-pc-cygwin/4.5.0/:/opt/gcc-4.5.0/lib/gcc/i686-pc-cygwin/4.5.0/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-Wall' '-std=c++0x' '-pedantic' '-c'
'-mtune=generic' '-march=pentiumpro'
14:33:31 Paul bibbi...@jijou
/cygdrive/d/CPPProjects/nano/gcc_bugs $
14:36:04 Paul bibbi...@jijou
/cygdrive/d/CPPProjects/nano/gcc_bugs $cat _5_1_2_8.ii
# 1 "_5_1_2_8.cpp"
# 1 "<built-in>"
# 1 "<command-line>"
# 1 "_5_1_2_8.cpp"
struct S2 { void f(int i); };
void S2::f(int i) {
[&, i]{ };
[&, &i]{ };
[=, this]{ };
}
--
Summary: [C++0x] gcc-4.5.0 does not fail invalid lambda captures
(against n3092 5.1.2/8)
Product: gcc
Version: 4.5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: paul dot bibbings at gmail dot com
GCC host triplet: i686-pc-cygwin
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43831
