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: unassig...@gcc.gnu.org
ReportedBy: pets...@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
