[Bug c++/32350] New: Very high compile times for template code
The attached code takes 1m29s to compile on my machine with 4.2.0 in 64-bit mode, and takes 0.5s on 4.0.3 Using built-in specs. Target: x86_64-suse-linux Configured with: ../../gcc-4.2.0/configure --enable-languages=c,c++,fortran --prefix=/usr/local/products/gcc/4.2.0-pa-64 --with-gnu-as --with-as=/usr/local/products/gcc/binutils-2.17-64/bin/as --with-gnu-ld --with-ld=/usr/local/products/gcc/binutils-2.17-64/bin/ld --enable-threads=posix --enable-shared --enable-__cxa_atexit --with-gmp=/usr/local/products/gcc/gmp-4.2-64 --with-mpfr=/usr/local/products/gcc/mpfr-2.2.1-64 --enable-libstdcxx-allocator=pool x86_64-suse-linux Thread model: posix gcc version 4.2.0 monsterd09:/work/nova/2300> time /usr/local/products/gcc/4.2.0-pa-64/bin/g++ -O0 -I/work/nova/sts5/beta/src -I/work/ren/ren/src -I/work/ren/ren.ext/src -D_LARGEFILE64_SOURCE -ftemplate-depth-64 -pedantic-errors -Wall -Wno-unknown-pragmas -W -Woverloaded-virtual -fno-strict-aliasing -fsigned-char -Wno-long-long test_fixedpoint_case.C real1m29.184s user1m28.338s sys 0m0.204s -- Summary: Very high compile times for template code Product: gcc Version: 4.2.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: georgeh at rentec dot com http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32350
[Bug c++/32350] Very high compile times for template code
--- Comment #1 from georgeh at rentec dot com 2007-06-14 22:02 --- Created an attachment (id=13706) --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=13706&action=view) Preprocessed source -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32350
[Bug c++/24525] New: g++ fails to warn when converting UDT through double to int
g++-4.0.0 compiles the following code without warning, with both -Wconversion
and -Wall turned on. Since it is converting the UDT into a double, then
converting the double to an int, I believe it should warn exactly as it does in
the case when the commented-out line is used in place of the direct assignment.
monsterd07> g++ -Wall test.C
monsterd07> ./a.out
monsterd07> g++ --version
g++ (GCC) 3.3.4 (pre 3.3.5 20040809)
Copyright (C) 2003 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
(test.C)
#include
struct T {
explicit T(int i): mV(i) {}
operator double() const {
return mV;
}
int mV;
};
int main() {
T t(5);
int y = t;
// int y = double(t);
assert(y == 5);
}
--
Summary: g++ fails to warn when converting UDT through double to
int
Product: gcc
Version: 3.3.4
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: georgeh at rentec dot com
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24525
[Bug c++/43522] New: 4.4 regression: Attempts to instantiate unnecessary code
Code:
---
template struct tester;
template <> struct tester { enum { value = 1 }; };
template
struct allow_double_instantiations {
static const bool value = false;
};
template
class FixedPoint {
static const bool allow_double_instantiations = false;
typedef FixedPoint Self;
public:
FixedPoint(): mValue(0) {}
//Default copy c'tor, assignment op valid & useful.
Self &operator=(double const &d) {
mValue = sizeof(tester);
return *this;
}
int mValue;
};
void foo(FixedPoint<4> &);
int main() {
FixedPoint<4> x;
foo(x);
return 0;
}
template <>
FixedPoint<4> &FixedPoint<4>::operator=(double const &d) {
mValue = int(d);
return *this;
}
void foo(FixedPoint<4> &t) {
t = 13.5;
}
-
gcc 4.3.2 and earlier versions compile this without complaint; 4.4.3 dies with
test_fixedpoint.C: In member function `FixedPoint&
FixedPoint::operator=(const double&)':
test_fixedpoint.C:21: error: invalid application of `sizeof' to incomplete type
`tester'
By my reading of the standard, the invalid definition of operator= should not
be attempted to be instantiated until line 43, where the valid template
specialization has been seen, and previous versions of g++ agree with me. Note
that in the original code, line 21 was a BOOST_STATIC_ASSERT and produced the
same result.
--
Summary: 4.4 regression: Attempts to instantiate unnecessary code
Product: gcc
Version: 4.4.3
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: georgeh at rentec dot com
GCC target triplet: i686-suse-linux
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43522
[Bug c++/43522] 4.4 regression: Attempts to instantiate unnecessary code
--- Comment #1 from georgeh at rentec dot com 2010-03-25 18:07 --- g++ -v output -- apologies: Using built-in specs. Target: i686-suse-linux Configured with: ../../gcc-4.4.3/configure --enable-languages=c,c++,fortran --p refix=/usr/local/products/gcc/4.4.3-32 --with-gnu-as --with-as=/usr/local/produ cts/gcc/binutils-2.19-32/bin/as --with-gnu-ld --with-ld=/usr/local/products/gcc /binutils-2.19-32/bin/ld --enable-threads=posix --enable-shared --enable-__cxa_ atexit --with-gmp=/usr/local/products/gcc/gmp-4.2.4-32 --with-mpfr=/usr/local/p roducts/gcc/mpfr-2.3.2-32 --enable-libstdcxx-allocator=pool i686-suse-linux Thread model: posix gcc version 4.4.3 (GCC) -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43522
[Bug c++/24525] g++ fails to warn when converting UDT through double to int
--- Comment #3 from georgeh at rentec dot com 2006-12-11 14:34 --- (In reply to comment #2) > > Is this what you wished? > Yes. -- georgeh at rentec dot com changed: What|Removed |Added Status|WAITING |RESOLVED Resolution||FIXED http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24525
