http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58922
Bug ID: 58922
Summary: LTO undefined symbols with virtual destructor
Product: gcc
Version: 4.8.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: lto
Assignee: unassigned at gcc dot gnu.org
Reporter: jamiespence2 at gmail dot com
Created attachment 31111
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31111&action=edit
Small project to demonstrate virtual destructor with LTO
There seems to be an issue when compiling/Linking with LTO enabled with GCC
4.8.1. I get undefined references to symbols in a DLL even though they seem to
be present. With LTO disabled it compiles and links successfully.
Dependency walker shows the symbols are present in the DLL. LTO can't seem to
find them.
Removing LTO optimization makes everything compile successfully, I'm wondering
why this is an issue.
Attached a small project which demonstrates the problem.
GCC information: MinGW-Builds 4.8.1
>gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=c:/mingw32/bin/../libexec/gcc/i686-w64-mingw32/4.8.1/lto-wrapper.exe
Target: i686-w64-mingw32
Configured with: ../../../src/gcc-4.8.1/configure --host=i686-w64-mingw32
--build=i686-w64-mingw32 --target=i686-w64-mingw32 --prefix=/mingw32
--with-sysroot=/tmp/x32-481-win32-dwarf-r5/mingw32 --enable-shared
--enable-static --disable-multilib
--enable-languages=ada,c,c++,fortran,objc,obj-c++,lto
--enable-libstdcxx-time=yes --enable-threads=win32 --enable-libgomp
--enable-lto --enable-graphite --enable-checking=release
--enable-fully-dynamic-string --enable-version-specific-runtime-libs
--disable-sjlj-exceptions --with-dwarf2 --disable-isl-version-check
--disable-cloog-version-check --disable-libstdcxx-pch --disable-libstdcxx-debug
--enable-bootstrap --disable-rpath --disable-win32-registry --disable-nls
--disable-werror --disable-symvers --with-gnu-as --with-gnu-ld --with-arch=i686
--with-tune=generic --with-libiconv --with-system-zlib
--with-gmp=/tmp/mingw-prereq/i686-w64-mingw32-static
--with-mpfr=/tmp/mingw-prereq/i686-w64-mingw32-static
--with-mpc=/tmp/mingw-prereq/i686-w64-mingw32-static
--with-isl=/tmp/mingw-prereq/i686-w64-mingw32-static
--with-cloog=/tmp/mingw-prereq/i686-w64-mingw32-static
--enable-cloog-backend=isl --with-pkgversion='rev5, Built by MinGW-W64 project'
--with-bugurl=http://sourceforge.net/projects/mingw-w64 CFLAGS='-O2 -pipe
-I/tmp/x32-481-win32-dwarf-r5/libs/include -I/tmp/mingw-prereq/x32-zlib/include
-I/tmp/mingw-prereq/i686-w64-mingw32-static/include' CXXFLAGS='-O2 -pipe
-I/tmp/x32-481-win32-dwarf-r5/libs/include -I/tmp/mingw-prereq/x32-zlib/include
-I/tmp/mingw-prereq/i686-w64-mingw32-static/include' CPPFLAGS= LDFLAGS='-pipe
-L/tmp/x32-481-win32-dwarf-r5/libs/lib -L/tmp/mingw-prereq/x32-zlib/lib
-L/tmp/mingw-prereq/i686-w64-mingw32-static/lib
-L/tmp/x32-481-win32-dwarf-r5/mingw32/opt/lib -Wl,--large-address-aware'
Thread model: win32
gcc version 4.8.1 (rev5, Built by MinGW-W64 project)
