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Mail Archives: cygwin/2013/11/12/17:31:24

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Date: Wed, 13 Nov 2013 06:30:05 +0800
From: JonY <10walls AT gmail DOT com>
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To: cygwin AT cygwin DOT com
Subject: Re: C++11 program link failure under GCC 4.8.2-1
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On 11/13/2013 02:35, Yucong Sun wrote:
> Good new! I've found the link failure issue, it is caused by  "-rdynamic"
>=20
> sunyc AT sunyc-wks ~
> $ cat 2.cc
> #include <deque>
>=20
> struct tick_event {
>     int i;
> };
>=20
> int main() {
>     std::deque<tick_event *> list;
>=20
>     tick_event *a =3D new tick_event;
>     list.push_back(a);
>     return 0;
> }
>=20
> sunyc AT sunyc-wks ~
> $ g++ -c --std=3Dc++11 -O3 -flto 2.cc -o 2.o
>=20
> sunyc AT sunyc-wks ~
> $ g++ --std=3Dc++11 -flto -D_GNU_SOURCE -rdynamic -fno-omit-frame-pointer=
 -D_GNU_
> SOURCE -march=3Dnative  -O3 2.o -o a
> Cannot export _ZNSt5dequeIP10tick_eventSaIS1_EE16_M_push_back_auxIJRKS1_E=
EEvDpOT
> _: symbol wrong type (4 vs 3)
> collect2: error: ld returned 1 exit status
>=20
>=20
> sunyc AT sunyc-wks ~
> $ g++ --std=3Dc++11 -flto -D_GNU_SOURCE -fno-omit-frame-pointer -D_GNU_SO=
URCE -ma
> rch=3Dnative  -O3 2.o -o a
>=20
> sunyc AT sunyc-wks ~
> $
>=20
> Hope it would help you nail the problem.
>=20

-rdynamic shouldn't do anything on Windows, I guess using ELF specific
arguments can break things.
>=20
> And Here's the test case for snprintf & c++11
>=20
> $ gcc -v
> Using built-in specs.
> COLLECT_GCC=3Dgcc
> COLLECT_LTO_WRAPPER=3D/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=3D/cygdrive/i/szsz/tmpp/cygwin64/gcc/gcc-4.8.2-1/src/gcc=
-4.8.2 --
> prefix=3D/usr --exec-prefix=3D/usr --bindir=3D/usr/bin --sbindir=3D/usr/s=
bin --libexecdi
> r=3D/usr/libexec --datadir=3D/usr/share --localstatedir=3D/var --sysconfd=
ir=3D/etc --lib
> dir=3D/usr/lib --datarootdir=3D/usr/share --docdir=3D/usr/share/doc/gcc -=
C --build=3Dx86
> _64-pc-cygwin --host=3Dx86_64-pc-cygwin --target=3Dx86_64-pc-cygwin --wit=
hout-libico
> nv-prefix --without-libintl-prefix --enable-shared --enable-shared-libgcc=
 --enab
> le-static --enable-version-specific-runtime-libs --enable-bootstrap --dis=
able-__
> cxa_atexit --with-dwarf2 --with-tune=3Dgeneric --enable-languages=3Dc,c++=
,fortran,lt
> o,objc,obj-c++ --enable-graphite --enable-threads=3Dposix --enable-libato=
mic --ena
> ble-libgomp --disable-libitm --enable-libquadmath --enable-libquadmath-su=
pport -
> -enable-libssp --enable-libgcj-sublibs --disable-java-awt --disable-symve=
rs --wi
> th-ecj-jar=3D/usr/share/java/ecj.jar --with-gnu-ld --with-gnu-as --with-c=
loog-incl
> ude=3D/usr/include/cloog-isl --without-libiconv-prefix --without-libintl-=
prefix --
> with-system-zlib
> Thread model: posix
> gcc version 4.8.2 (GCC)
>=20
>=20
> sunyc AT sunyc-wks ~
> $ cat 1.cc
> #include <stdio.h>
>=20
> int main() {
>  char out[255];
>  snprintf(out, sizeof(out), "%d", 1);
>  return 1;
> }
>=20
> sunyc AT sunyc-wks ~
> $ g++ --std=3Dc++11 1.cc
> 1.cc: In function =E2=80=98int main()=E2=80=99:
> 1.cc:5:36: error: =E2=80=98snprintf=E2=80=99 was not declared in this sco=
pe
>   snprintf(out, sizeof(out), "%d", 1);
>                                     ^
>=20
> sunyc AT sunyc-wks ~
> $ g++ --std=3Dgnu++0x 1.cc
>=20
> sunyc AT sunyc-wks ~
> $ ls -lah a.exe
> -rwxr-xr-x 1 sunyc None 62K Nov 12 10:21 a.exe
>=20
> Cheers.
>=20

Right now, it is guarded by:
#if !defined(__STRICT_ANSI__) || (__STDC_VERSION__ >=3D 199901L)

Which means non-strict mode and C99 mode, snprintf was not part of
C++03. I guess (__cplusplus >=3D 201103L) needs to be added to newlib.



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