[Bug c++/70435] New: section attribute of a function template is not honored.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70435
Bug ID: 70435
Summary: section attribute of a function template is not
honored.
Product: gcc
Version: 5.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: kukyakya at gmail dot com
Target Milestone: ---
namespace /* anonymous */
{
[[gnu::section(".mysection")]]
void regular_func() { }
template
[[gnu::section(".mysection")]]
void template_func() { }
} // namespace /* anonymous */
void (*ptr1)() = _func;
void (*ptr2)() = _func;
In the code above the section attribute is given to both of the regular
function and the function template, but the templated function is not placed in
.mysection but .text.
$ g++ -std=c++14 a.cpp -c && objdump -t a.o | grep -E "regular|template"
l F .mysection 0007
_ZN12_GLOBAL__N_112regular_funcEv
l F .text 0007
_ZN12_GLOBAL__N_113template_funcIiEEvv
~/temp/c++/function_template_section $
I also tried it with clang and clang put the function into .mysection as I
expected.
$ clang++ -std=c++14 a.cpp -c && objdump -t a.o | grep -E "regular|template"
l F .mysection 0006
_ZN12_GLOBAL__N_112regular_funcEv
0010 l F .mysection 0006
_ZN12_GLOBAL__N_113template_funcIiEEvv
[Bug c++/69065] [C++11] multiple alignas specifiers
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69065
kukyakya at gmail dot com changed:
What|Removed |Added
Status|UNCONFIRMED |RESOLVED
Resolution|--- |INVALID
--- Comment #1 from kukyakya at gmail dot com ---
'alignas' specifier is not meant to be used in type declaration.
(http://stackoverflow.com/a/34006668/1030861)
Was not a bug.
Works as expected if used properly.
---
#include
struct test1 {
alignas(int) alignas(double) char _;
};
struct test2 {
alignas(double) alignas(int) char _;
};
int main()
{
std::cout << "alignof(int) is " << alignof(int) << std::endl;
std::cout << "alignof(double) is " << alignof(double) << std::endl;
std::cout << "alignof(test1) is " << alignof(test1) << std::endl;
std::cout << "alignof(test2) is " << alignof(test2) << std::endl;
}
---
alignof(int) is 4
alignof(double) is 8
alignof(test1) is 8
alignof(test2) is 8
---
[Bug c++/69065] [C++11] multiple alignas specifiers
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69065
kukyakya at gmail dot com changed:
What|Removed |Added
Status|RESOLVED|UNCONFIRMED
Resolution|INVALID |---
--- Comment #2 from kukyakya at gmail dot com ---
Reopening the bug. It still does not accept 'alignas(pack...)' form.
---
#include
struct test {
alignas(int, double) char _;
};
int main()
{
std::cout << "alignof(int) is " << alignof(int) << std::endl;
std::cout << "alignof(double) is " << alignof(double) << std::endl;
std::cout << "alignof(test) is " << alignof(test) << std::endl;
}
---
$ g++ -Wall -Wextra -std=c++14 -pedantic -O2 a.cpp
a.cpp:4:13: error: expected ‘)’ before ‘,’ token
alignas(int, double) char _;
^
a.cpp:4:13: error: expected ‘)’ before ‘,’ token
a.cpp:4:13: error: expected unqualified-id before ‘,’ token
---
[Bug c++/69065] New: [C++11] multiple alignas specifiers
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69065
Bug ID: 69065
Summary: [C++11] multiple alignas specifiers
Product: gcc
Version: 5.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: kukyakya at gmail dot com
Target Milestone: ---
http://en.cppreference.com/w/cpp/language/alignas (quoting it since I don't
have the C++11 standard documents now) states that `alignas` can be used in the
form of `alignas(pack...)`, but both g++ and clang++ fail to compile it.
struct alignas(int, double) test
{ };
So I tried to use multiple `alignas` specifiers, but got unexpected results.
#include
// struct alignas(int, double) test
// { };
struct alignas(int) alignas(double) test1 { };
struct alignas(double) alignas(int) test2 { };
int main()
{
std::cout << "alignof(int) is " << alignof(int) << std::endl;
std::cout << "alignof(double) is " << alignof(double) << std::endl;
// std::cout << "alignof(test) is " << alignof(test) << std::endl;
std::cout << "alignof(test1) is " << alignof(test1) << std::endl;
std::cout << "alignof(test2) is " << alignof(test2) << std::endl;
}
alignof(int) is 4
alignof(double) is 8
alignof(test1) is 8
alignof(test2) is 4
With clang++ I got
alignof(int) is 4
alignof(double) is 8
alignof(test1) is 8
alignof(test2) is 8
I'm not sure if it's okay to give multiple `alignas` specifiers, but I think it
should have the strictest alignment if it's okay. G++ seems to apply only the
latest `alignas` specifier.
[Bug lto/58203] memset/memcpy are discarded with -flto
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58203 --- Comment #1 from kukyakya at gmail dot com --- Created attachment 30679 -- http://gcc.gnu.org/bugzilla/attachment.cgi?id=30679action=edit Test case
[Bug lto/58203] New: memset/memcpy are discarded with -flto
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58203
Bug ID: 58203
Summary: memset/memcpy are discarded with -flto
Product: gcc
Version: 4.8.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: lto
Assignee: unassigned at gcc dot gnu.org
Reporter: kukyakya at gmail dot com
It might be a duplicate of bug 51205 but it's happening again.
[test.cpp]
typedef void (*action_t)(const unsigned char*);
extern C void _start(action_t action)
{
const unsigned char foo[256] = {};
action(foo);
}
typedef __SIZE_TYPE__ size_t;
extern C
void*
//__attribute__((externally_visible)) // Workaround
memset(void* dst, int c, size_t len)
{
unsigned char * d = (unsigned char*)dst;
while(len--)
*d++ = c;
return dst;
}
[error]
$ arm-none-linux-gnueabi-g++ -fno-exceptions -nostartfiles -static -nostdlib
-nodefaultlibs -flto test.cpp -o test
`memset' referenced in section `.text' of /tmp/cc7ooAE0.ltrans0.ltrans.o:
defined in discarded section `.text' of /tmp/ccVDnjy6.o (symbol from plugin)
collect2: error: ld returned 1 exit status
[versions]
arm-none-linux-gnueabi-g++ --version : 4.8.1
arm-none-linux-gnueabi-ld --version : 2.23.2
