On 11/13/2013 02:35, Yucong Sun wrote:
Good new! I've found the link failure issue, it is caused by "-rdynamic"
sunyc@sunyc-wks ~
$ cat 2.cc
#include <deque>
struct tick_event {
int i;
};
int main() {
std::deque<tick_event *> list;
tick_event *a = new tick_event;
list.push_back(a);
return 0;
}
sunyc@sunyc-wks ~
$ g++ -c --std=c++11 -O3 -flto 2.cc -o 2.o
sunyc@sunyc-wks ~
$ g++ --std=c++11 -flto -D_GNU_SOURCE -rdynamic -fno-omit-frame-pointer -D_GNU_
SOURCE -march=native -O3 2.o -o a
Cannot export _ZNSt5dequeIP10tick_eventSaIS1_EE16_M_push_back_auxIJRKS1_EEEvDpOT
_: symbol wrong type (4 vs 3)
collect2: error: ld returned 1 exit status
sunyc@sunyc-wks ~
$ g++ --std=c++11 -flto -D_GNU_SOURCE -fno-omit-frame-pointer -D_GNU_SOURCE -ma
rch=native -O3 2.o -o a
sunyc@sunyc-wks ~
$
Hope it would help you nail the problem.
-rdynamic shouldn't do anything on Windows, I guess using ELF specific
arguments can break things.
And Here's the test case for snprintf & c++11
$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-pc-cygwin/4.8.2/lto-wrapper.exe
Target: x86_64-pc-cygwin
Configured with: /cygdrive/i/szsz/tmpp/cygwin64/gcc/gcc-4.8.2-1/src/gcc-4.8.2/co
nfigure --srcdir=/cygdrive/i/szsz/tmpp/cygwin64/gcc/gcc-4.8.2-1/src/gcc-4.8.2 --
prefix=/usr --exec-prefix=/usr --bindir=/usr/bin --sbindir=/usr/sbin --libexecdi
r=/usr/libexec --datadir=/usr/share --localstatedir=/var --sysconfdir=/etc --lib
dir=/usr/lib --datarootdir=/usr/share --docdir=/usr/share/doc/gcc -C --build=x86
_64-pc-cygwin --host=x86_64-pc-cygwin --target=x86_64-pc-cygwin --without-libico
nv-prefix --without-libintl-prefix --enable-shared --enable-shared-libgcc --enab
le-static --enable-version-specific-runtime-libs --enable-bootstrap --disable-__
cxa_atexit --with-dwarf2 --with-tune=generic --enable-languages=c,c++,fortran,lt
o,objc,obj-c++ --enable-graphite --enable-threads=posix --enable-libatomic --ena
ble-libgomp --disable-libitm --enable-libquadmath --enable-libquadmath-support -
-enable-libssp --enable-libgcj-sublibs --disable-java-awt --disable-symvers --wi
th-ecj-jar=/usr/share/java/ecj.jar --with-gnu-ld --with-gnu-as --with-cloog-incl
ude=/usr/include/cloog-isl --without-libiconv-prefix --without-libintl-prefix --
with-system-zlib
Thread model: posix
gcc version 4.8.2 (GCC)
sunyc@sunyc-wks ~
$ cat 1.cc
#include <stdio.h>
int main() {
char out[255];
snprintf(out, sizeof(out), "%d", 1);
return 1;
}
sunyc@sunyc-wks ~
$ g++ --std=c++11 1.cc
1.cc: In function âint main()â:
1.cc:5:36: error: âsnprintfâ was not declared in this scope
snprintf(out, sizeof(out), "%d", 1);
^
sunyc@sunyc-wks ~
$ g++ --std=gnu++0x 1.cc
sunyc@sunyc-wks ~
$ ls -lah a.exe
-rwxr-xr-x 1 sunyc None 62K Nov 12 10:21 a.exe
Cheers.
Right now, it is guarded by:
#if !defined(__STRICT_ANSI__) || (__STDC_VERSION__ >= 199901L)
Which means non-strict mode and C99 mode, snprintf was not part of
C++03. I guess (__cplusplus >= 201103L) needs to be added to newlib.