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* [Bug c++/51640] New: Misleading error if the type in the catch() is ambiguous
@ 2011-12-20 16:49 petschy at gmail dot com
  2011-12-20 16:49 ` [Bug c++/51640] " petschy at gmail dot com
                   ` (6 more replies)
  0 siblings, 7 replies; 8+ messages in thread
From: petschy at gmail dot com @ 2011-12-20 16:49 UTC (permalink / raw)
  To: gcc-bugs

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51640

             Bug #: 51640
           Summary: Misleading error if the type in the catch() is
                    ambiguous
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: minor
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: petschy@gmail.com


Created attachment 26154
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=26154
test case that triggers the bug

There is a regression from g++ 4.4 in later versions. If the name of the class
is ambiguous in a catch(), this fact is not reported.

At line 25 when compiling the attached test case with 4.5.x, 4.6.x or 4.7.0,
the ambiguity of the type name 'ex2' is not mentioned.

4.4.6 reports the ambiguity at the catch(), though for other ambiguities (at
variable definition, class declaration w/ ambiguous parent) it prints the
message twice. 4.5 and above versions print the error once in these latter
cases. I suspect that this regression might be connected to fixing the
duplicated error printing.

Tested on an amd64 machine with Debian Wheezy, stock 4.4, 4.5, 4.6 versions
(4.4.6-14, 4.5.3-9, 4.6.2-7) and 4.7.0 built from svn trunk r182460.

The original cpp file is attached, since it doesn't have any preprocessor
directives except for comments.

Command line and output:

g++-r182460 -v -save-temps -Wall -Wextra -c test_gccexbug2.cpp 
Using built-in specs.
COLLECT_GCC=g++-r182460
COLLECT_LTO_WRAPPER=/usr/local/libexec/gcc/x86_64-unknown-linux-gnu/4.7.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ./configure --program-suffix -r182460
Thread model: posix
gcc version 4.7.0 20111219 (experimental) (GCC) 
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-Wall' '-Wextra' '-c' '-shared-libgcc'
'-mtune=generic' '-march=x86-64'
 /usr/local/libexec/gcc/x86_64-unknown-linux-gnu/4.7.0/cc1plus -E -quiet -v
-D_GNU_SOURCE test_gccexbug2.cpp -mtune=generic -march=x86-64 -Wall -Wextra
-fpch-preprocess -o test_gccexbug2.ii
ignoring nonexistent directory
"/usr/local/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../x86_64-unknown-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:

/usr/local/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0

/usr/local/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/x86_64-unknown-linux-gnu

/usr/local/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/backward
 /usr/local/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/include
 /usr/local/include
 /usr/local/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/include-fixed
 /usr/include
End of search list.
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-Wall' '-Wextra' '-c' '-shared-libgcc'
'-mtune=generic' '-march=x86-64'
 /usr/local/libexec/gcc/x86_64-unknown-linux-gnu/4.7.0/cc1plus -fpreprocessed
test_gccexbug2.ii -quiet -dumpbase test_gccexbug2.cpp -mtune=generic
-march=x86-64 -auxbase test_gccexbug2 -Wall -Wextra -version -o
test_gccexbug2.s
GNU C++ (GCC) version 4.7.0 20111219 (experimental) (x86_64-unknown-linux-gnu)
    compiled by GNU C version 4.7.0 20111218 (experimental), GMP version 5.0.2,
MPFR version 3.1.0-p3, MPC version 0.9
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
GNU C++ (GCC) version 4.7.0 20111219 (experimental) (x86_64-unknown-linux-gnu)
    compiled by GNU C version 4.7.0 20111218 (experimental), GMP version 5.0.2,
MPFR version 3.1.0-p3, MPC version 0.9
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
Compiler executable checksum: fafea236350b995726228b0b21cd1771
test_gccexbug2.cpp: In function ‘void bar()’:
test_gccexbug2.cpp:25:11: error: expected type-specifier before ‘ex2’
test_gccexbug2.cpp:25:14: error: expected ‘)’ before ‘&’ token
test_gccexbug2.cpp:25:14: error: expected ‘{’ before ‘&’ token
test_gccexbug2.cpp:25:15: error: expected primary-expression before ‘)’ token
test_gccexbug2.cpp:25:15: error: expected ‘;’ before ‘)’ token


^ permalink raw reply	[flat|nested] 8+ messages in thread
end of thread, other threads:[~2014-05-16 17:43 UTC | newest]

Thread overview: 8+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2011-12-20 16:49 [Bug c++/51640] New: Misleading error if the type in the catch() is ambiguous petschy at gmail dot com
2011-12-20 16:49 ` [Bug c++/51640] " petschy at gmail dot com
2011-12-20 17:01 ` redi at gcc dot gnu.org
2012-01-04 20:45 ` petschy at gmail dot com
2012-01-04 22:21 ` pinskia at gcc dot gnu.org
2014-05-16 15:02 ` paolo.carlini at oracle dot com
2014-05-16 17:43 ` paolo.carlini at oracle dot com
2014-05-16 17:43 ` paolo at gcc dot gnu.org

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