Compiling a .cpp file with the following contents triggers an internal compiler
error:
<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
struct Base {
template<class C> void method() { }
};
struct Left : public Base { };
struct Right : public Base { };
struct Join : public Left, public Right { };
void function()
{
Join join;
join.Base::method<int>();
join.Left::method<int>();
}
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
Issued command-line:
g++ -Wall -W -Wundef -Wpointer-arith -g -O0 -c -o /dev/null bug.cpp
Resulting output:
bug.cpp: In function 'void function()':
bug.cpp:13: internal compiler error: in build_base_path, at cp/class.c:273
Please submit a full bug report,
...
The error does not occur if structs Left and Right inherit virtually from Base;
that is, "struct Left : virtual public Base { };" and similarly for Right.
The same error occurs with gcc-3.4.3, the only difference being that the
relevant line number in cp/class.cp is 275.
Full output from running with "-v --save-temps" is as follows:
g++ -v -save-temps -Wall -W -Wundef -Wpointer-arith -g -O0 -c -o /dev/null
bug.cpp
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
Using built-in specs.
Target: i686-pc-linux-gnu
Configured with: ../gcc-4.1.1/configure --enable-shared --enable-threads=posix
--enable-__cxa_atexit --enable-clocale=gnu --enable-languages=c,c++
Thread model: posix
gcc version 4.1.1
/usr/local/libexec/gcc/i686-pc-linux-gnu/4.1.1/cc1plus -E -quiet -v
-D_GNU_SOURCE bug.cpp -mtune=pentiumpro -Wall -W -Wundef -Wpointer-arith
-fworking-directory -O0 -fpch-preprocess -o bug.ii
ignoring nonexistent directory "NONE/include"
ignoring nonexistent directory
"/usr/local/lib/gcc/i686-pc-linux-gnu/4.1.1/../../../../i686-pc-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/local/lib/gcc/i686-pc-linux-gnu/4.1.1/../../../../include/c++/4.1.1
/usr/local/lib/gcc/i686-pc-linux-gnu/4.1.1/../../../../include/c++/4.1.1/i686-pc-linux-gnu
/usr/local/lib/gcc/i686-pc-linux-gnu/4.1.1/../../../../include/c++/4.1.1/backward
/usr/local/include
/usr/local/lib/gcc/i686-pc-linux-gnu/4.1.1/include
/usr/include
End of search list.
/usr/local/libexec/gcc/i686-pc-linux-gnu/4.1.1/cc1plus -fpreprocessed bug.ii
-quiet -dumpbase bug.cpp -mtune=pentiumpro -auxbase-strip /dev/null -g -O0
-Wall -W -Wundef -Wpointer-arith -version -o bug.s
GNU C++ version 4.1.1 (i686-pc-linux-gnu)
compiled by GNU C version 4.1.1.
GGC heuristics: --param ggc-min-expand=63 --param ggc-min-heapsize=63424
Compiler executable checksum: 5c1ee95ea2451a4e1aafd30c10a207cb
bug.cpp: In function 'void function()':
bug.cpp:13: internal compiler error: in build_base_path, at cp/class.c:273
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
Contents of bug.ii:
<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
# 1 "bug.cpp"
# 1 "/home/raymond/tmp//"
# 1 "<built-in>"
# 1 "<command line>"
# 1 "bug.cpp"
struct Base {
template<class C> void method() { }
};
struct Left : public Base { };
struct Right : public Base { };
struct Join : public Left, public Right { };
void function()
{
Join join;
join.Base::method<int>();
join.Left::method<int>();
}
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
--
Summary: Multiple-inheritance code triggers "internal compiler
error: in build_base_path, at cp/class.c:273"
Product: gcc
Version: 4.1.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: raymond at corvil dot com
GCC build triplet: i686-pc-linux-gnu
GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29080
