I'm compiling the attached source and inspecting symbols in it:
g++-4.3 -v -save-temps -Wall -Wextra -O2 -fno-inline-small-functions
mylib.cpp -c -o mylib.o
nm mylib.o | c++filt | grep 'serialize<'
With -O2 -fno-inline-small-functions (as above), nm gives (as expected):
00000000 W void
boost::serialization::serialize<boost::archive::xml_iarchive>(boost::archive::xml_iarchive&,
A&, unsigned int)
00000000 W void
boost::serialization::serialize<boost::archive::xml_iarchive>(boost::archive::xml_iarchive&,
B&, unsigned int)
00000000 W void
boost::serialization::serialize<boost::archive::xml_oarchive>(boost::archive::xml_oarchive&,
A&, unsigned int)
00000000 W void
boost::serialization::serialize<boost::archive::xml_oarchive>(boost::archive::xml_oarchive&,
B&, unsigned int)
With just -O2, some symbols are missing:
00000000 W void
boost::serialization::serialize<boost::archive::xml_iarchive>(boost::archive::xml_iarchive&,
B&, unsigned int)
00000000 W void
boost::serialization::serialize<boost::archive::xml_oarchive>(boost::archive::xml_oarchive&,
B&, unsigned int)
The disappearing functions are explicit template instantiations, that are not
marked static, or inline. With g++-4.1 and g++-4.2, no symbols are missing.
The g++ output follows.
Using built-in specs.
Target: i486-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 4.3.2-1ubuntu11'
--with-bugurl=file:///usr/share/doc/gcc-4.3/README.Bugs
--enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr --enable-shared
--with-system-zlib --libexecdir=/usr/lib --without-included-gettext
--enable-threads=posix --enable-nls --with-gxx-include-dir=/usr/include/c++/4.3
--program-suffix=-4.3 --enable-clocale=gnu --enable-libstdcxx-debug
--enable-objc-gc --enable-mpfr --enable-targets=all --enable-checking=release
--build=i486-linux-gnu --host=i486-linux-gnu --target=i486-linux-gnu
Thread model: posix
gcc version 4.3.2 (Ubuntu 4.3.2-1ubuntu11)
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-Wall' '-Wextra' '-O2' '-c' '-o'
'mylib.o' '-shared-libgcc' '-mtune=generic'
/usr/lib/gcc/i486-linux-gnu/4.3.2/cc1plus -E -quiet -v -D_GNU_SOURCE mylib.cpp
-D_FORTIFY_SOURCE=2 -mtune=generic -Wall -Wextra -O2 -fpch-preprocess -o
mylib.ii
ignoring nonexistent directory "/usr/local/include/i486-linux-gnu"
ignoring nonexistent directory
"/usr/lib/gcc/i486-linux-gnu/4.3.2/../../../../i486-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/include/c++/4.3
/usr/include/c++/4.3/i486-linux-gnu
/usr/include/c++/4.3/backward
/usr/local/include
/usr/lib/gcc/i486-linux-gnu/4.3.2/include
/usr/lib/gcc/i486-linux-gnu/4.3.2/include-fixed
/usr/include/i486-linux-gnu
/usr/include
End of search list.
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-Wall' '-Wextra' '-O2' '-c' '-o'
'mylib.o' '-shared-libgcc' '-mtune=generic'
/usr/lib/gcc/i486-linux-gnu/4.3.2/cc1plus -fpreprocessed mylib.ii -quiet
-dumpbase mylib.cpp -mtune=generic -auxbase-strip mylib.o -O2 -Wall -Wextra
-version -fstack-protector -o mylib.s
GNU C++ (Ubuntu 4.3.2-1ubuntu11) version 4.3.2 (i486-linux-gnu)
compiled by GNU C version 4.3.2, GMP version 4.2.2, MPFR version 2.3.2.
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: dc8f858cacda993dd8f70837f0d9565d
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-Wall' '-Wextra' '-O2' '-c' '-o'
'mylib.o' '-shared-libgcc' '-mtune=generic'
as -V -Qy -o mylib.o mylib.s
GNU assembler version 2.18.93 (i486-linux-gnu) using BFD version (GNU Binutils
for Ubuntu) 2.18.93.20081009
COMPILER_PATH=/usr/lib/gcc/i486-linux-gnu/4.3.2/:/usr/lib/gcc/i486-linux-gnu/4.3.2/:/usr/lib/gcc/i486-linux-gnu/:/usr/lib/gcc/i486-linux-gnu/4.3.2/:/usr/lib/gcc/i486-linux-gnu/:/usr/lib/gcc/i486-linux-gnu/4.3.2/:/usr/lib/gcc/i486-linux-gnu/
LIBRARY_PATH=/usr/lib/gcc/i486-linux-gnu/4.3.2/:/usr/lib/gcc/i486-linux-gnu/4.3.2/:/usr/lib/gcc/i486-linux-gnu/4.3.2/../../../../lib/:/lib/../lib/:/usr/lib/../lib/:/usr/lib/gcc/i486-linux-gnu/4.3.2/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-Wall' '-Wextra' '-O2' '-c' '-o'
'mylib.o' '-shared-libgcc' '-mtune=generic'
--
Summary: g++ 4.3.2: -O2 without -fno-inline-small-functions makes
some template instantiations disappear
Product: gcc
Version: 4.3.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: ronan dot lehy at probayes dot com
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38828
