http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58592
Bug ID: 58592
Summary: -flto -fwhole-program caused undefined reference in
g++ 4.7.3
Product: gcc
Version: 4.7.3
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: suihong.liang at gmail dot com
Created attachment 30945
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30945&action=edit
source code and makefiles
Bug 41729 seems to be the same issue, however it was for 4.5.0 and it was
closed.
g++ 4.6.3 works fine, it compiles and runs.
However g++ 4.7.3 gives linking error "undefined reference".
Below shows the steps to reproduce. Thanks in advance!
linkerror/lib# make clean; make
rm -f *.o *.so
g++ -flto -fwhole-program -Wall -Werror -pedantic -Wextra -Weffc++ -Waddress
-Warray-bounds -Wno-builtin-macro-redefined -Wc++0x-compat -Wundef -std=c++0x
-c -fPIC A.cpp
g++ -flto -fwhole-program -Wall -Werror -pedantic -Wextra -Weffc++ -Waddress
-Warray-bounds -Wno-builtin-macro-redefined -Wc++0x-compat -Wundef -std=c++0x
-shared -o libself.so A.o
linkerror/app# make clean; make
rm -f *.o a.out
g++ -flto -fwhole-program -Wall -Werror -Wextra -pedantic -Weffc++ -Waddress
-Warray-bounds -Wno-builtin-macro-redefined -Wc++0x-compat -Wundef -std=c++0x
-c main.cpp
g++ -flto -fwhole-program -Wall -Werror -Wextra -pedantic -Weffc++ -Waddress
-Warray-bounds -Wno-builtin-macro-redefined -Wc++0x-compat -Wundef -std=c++0x
-o a.out main.o -L../lib -lself
/tmp/ccWfzcXT.ltrans0.ltrans.o: In function `main':
ccWfzcXT.ltrans0.o:(.text+0x1c): undefined reference to `A::A()'
ccWfzcXT.ltrans0.o:(.text+0x31): undefined reference to `A::~A()'
collect2: error: ld returned 1 exit status
make: *** [all] Error 1
# g++ -v
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.7/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu/Linaro
4.7.3-1ubuntu1' --with-bugurl=file:///usr/share/doc/gcc-4.7/README.Bugs
--enable-languages=c,c++,go,fortran,objc,obj-c++ --prefix=/usr
--program-suffix=-4.7 --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--with-gxx-include-dir=/usr/include/c++/4.7 --libdir=/usr/lib --enable-nls
--with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug
--enable-libstdcxx-time=yes --enable-gnu-unique-object --enable-plugin
--with-system-zlib --enable-objc-gc --with-cloog --enable-cloog-backend=ppl
--disable-cloog-version-check --disable-ppl-version-check --enable-multiarch
--disable-werror --with-arch-32=i686 --with-abi=m64
--with-multilib-list=m32,m64,mx32 --with-tune=generic --enable-checking=release
--build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 4.7.3 (Ubuntu/Linaro 4.7.3-1ubuntu1)
# uname -a
Linux sinit 3.8.0-31-generic #46-Ubuntu SMP Tue Sep 10 20:03:44 UTC 2013 x86_64
x86_64 x86_64 GNU/Linux
