gcc (GCC) 4.0.2 20050901 (prerelease) (SUSE Linux)
SUSE Linux 10.0 i686
I don'know, if this is a gcc or elf bug.
I use the following construct:
Slib1 => Dlib1
Slib1 + Dlib1 => Dlib2
Test => dlopen/dlclose (Dlib2)
Slib1 is a static lib.
Dlib1 is a shared lib containing Slib1.
Dlib2 is a shared lib containing Dlib1 and Slib1.
After building the libraries with hidden visibility:
tmp/demo/lib/linuxrelease> readelf -s -W -D libdlib1.so | c++filt
...
14 15: 00001a80 4 OBJECT GLOBAL DEFAULT 23 SLibC1::m_str
...
tmp/demo/lib/linuxrelease> readelf -s -W -D libdlib2.so | c++filt
...
14 15: 00001ad8 4 OBJECT GLOBAL DEFAULT 23 SLibC1::m_str
...
Both Dso-s will have the static member SLibC1::m_str with DEFAULT visibility.
If you try to load / read symbol / close / load the Dso libdlib2.so,
it will crash with the following error message:
*** glibc detected *** double free or corruption (fasttop): 0x0804b888 ***
If you set:
export MALLOC_CHECK_=3
you can see in the debugger,
that calling the global dtor in libdlib2.so at ~SLibC1::m_str() causes the
crash.
If you change hash_map to map in the example below (comment the line #define
BUG 1),
the test is OK. In this case the visibility of SLibC1::m_str is hidden.
If this problem already known, does a workaround exist?
I will supply the automake files. Without them I could not reproduce bug(?).
I try to upload the whole configuration, but here are source files in the
following tree:
(how can I upload an attachment?)
.
|-- AUTHORS <= dummy
|-- COPYING <= dummy
|-- ChangeLog <= dummy
|-- INSTALL <= dummy
|-- NEWS <= dummy
|-- README <= dummy
|-- configure.ac
|-- dlib1
| |-- dlib1_m1.cpp
| `-- makefile.am
|-- dlib2
| |-- dlib2_m1.cpp
| `-- makefile.am
|-- lib
|-- makefile.am
`-- stlib1
|-- makefile.am
`-- stlib1_m1.cpp
>>>>>>> stlib1_m1.cpp
#include <string>
#define BUG 1
#ifdef BUG
#include <ext/hash_map>
class SLibC1 : public __gnu_cxx::hash_map<int, int >
#else
#include <map>
class SLibC1 : public std::map<int, int >
#endif
{
public:
static const std::string m_str;
};
const std::string SLibC1::m_str = "SLibC1 1.0";
<<<<EOF>>>>
>>>>>>> dlib1_m1.cpp
struct __attribute__ ((visibility("default"))) Dlib1C1
{
void Dlib1Func1() {}
};
<<<<EOF>>>>
>>>>>>> dlib2_m1.cpp
struct __attribute__ ((visibility("default"))) Dlib2C1
{
void Dlib2Func1() {};
};
<<<<EOF>>>>
>>>>>>> configure.ac
_dnl Process this file with autoconf to produce a configure script.
AC_INIT([PSP],[pre])
AM_INIT_AUTOMAKE
dnl Checks for programs.
AC_PROG_LIBTOOL
#AC_PROG_RANLIB
AC_PROG_CXX
AC_PROG_CPP
AC_PROG_CC
AC_LANG(C++)
abs_top_srcdir=`pwd`
VERSION_INFO="-avoid-version"
AC_CONFIG_FILES([dlib1/makefile])
AC_CONFIG_FILES([dlib2/makefile])
AC_CONFIG_FILES([stlib1/makefile])
PRODNAME="linuxrelease"
CXXFLAGS=" -fvisibility=hidden -fvisibility-inlines-hidden -D_Linux "
CFLAGS=$CFLAGS" -fvisibility=hidden -D_Linux "
ALD_FLAGS=" -no-undefined"
SYSLIBS="-ldl"
AM_CONFIG_HEADER([config.h])
AC_CONFIG_FILES([makefile])
dnl Checks for libraries.
dnl Checks for header files.
dnl Checks for typedefs, structures, and compiler characteristics.
AC_C_CONST
AC_C_INLINE
AC_C_BIGENDIAN
AC_TYPE_SIZE_T
dnl Checks for library functions.
AC_SUBST(abs_top_srcdir)
AC_SUBST(PRODNAME)
AC_SUBST(AINC_PATH)
AC_SUBST(ALD_FLAGS)
AC_SUBST(SYSLIBS)
AC_SUBST(VERSION_INFO)
AC_OUTPUT([])
<<<<EOF>>>>
>>>>>>> ./makefile.am
SUBDIRS = stlib1 dlib1 dlib2 exe
<<<<EOF>>>>
>>>>>>> stlib1/makefile.am
libdir = ${abs_top_srcdir}/lib/@PRODNAME@
lib_LTLIBRARIES = libstlib1.la
libstlib1_la_LDFLAGS = -all-static
libstlib1_la_LIBADD =
libstlib1_la_SOURCES = stlib1_m1.cpp
libstlib1_la_CPPFLAGS = -D_LIB -I${top_srcdir}/inc @AINC_PATH@
install-exec-local:
mkdir -p $(libdir)/.libs && \
sed -e
"1s/libstlib1.la/libstlib1_noi.la/;s/^old_library=.*/old_library='..\/libstlib1.a'/;s/^installed=.*/installed=no/;s/^libdir=.*/libdir=''/"
libstlib1.la >$(libdir)/libstlib1_noi.la
<<<<EOF>>>>
>>>>>>> dlib1/makefile.am
libdir = ${abs_top_srcdir}/lib/@PRODNAME@
lib_LTLIBRARIES = libdlib1.la
libdlib1_la_LDFLAGS = @VERSION_INFO@ @ALD_FLAGS@
-L${abs_top_srcdir}/lib/@PRODNAME@
libdlib1_la_SOURCES = dlib1_m1.cpp
libdlib1_la_LIBADD = -lstlib1 @SYSLIBS@
libdlib1_la_CPPFLAGS = -D_USRDLL -DDLIB1_EXPORTS -I${top_srcdir}/stlib1
-I${top_srcdir}/inc @AINC_PATH@
install-exec-local:
rm -f $(libdir)/libdlib1.a && \
touch $(libdir)/_x.o && \
ar cru $(libdir)/libdlib1.a $(libdir)/_x.o && \
ranlib $(libdir)/libdlib1.a && \
cp $(libdir)/libdlib1.a .libs/ && \
rm -f $(libdir)/_x.o
<<<<EOF>>>>
>>>>>>> dlib2/makefile.am
libdir = ${abs_top_srcdir}/lib/@PRODNAME@
lib_LTLIBRARIES = libdlib2.la
libdlib2_la_LDFLAGS = @VERSION_INFO@ @ALD_FLAGS@
-L${abs_top_srcdir}/lib/@PRODNAME@
libdlib2_la_SOURCES = dlib2_m1.cpp
libdlib2_la_LIBADD = -ldlib1 -lstlib1 @SYSLIBS@
libdlib2_la_CPPFLAGS = -D_USRDLL -DDLIB2_EXPORTS -I${top_srcdir}/stlib1
-I${top_srcdir}/dlib1 -I${top_srcdir}/inc @AINC_PATH@
install-exec-local:
rm -f $(libdir)/libdlib2.a && \
touch $(libdir)/_x.o && \
ar cru $(libdir)/libdlib2.a $(libdir)/_x.o && \
ranlib $(libdir)/libdlib2.a && \
cp $(libdir)/libdlib2.a .libs/ && \
rm -f $(libdir)/_x.o
<<<<EOF>>>>
Installation:
go to the installation dir, and issue:
libtoolize --force
aclocal
autoheader
autoconf
automake --add-missing --warning=portability --warning=obsolete
./configure
make install
cd lib/linuxrelease
readelf -s -W -D libdlib1.so | c++filt
--
Summary: hidden visibility of static member in class derived from
hash_map changes to default visibility
Product: gcc
Version: 4.0.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: laszlo dot szakony at philips dot com
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26846
