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commit e5eeee53d814cedc12cd725e76b0eb87859cdd77
Author: Alexei Sheplyakov <Alexei.Sheplyakov(a)gmail.com>
Date: Tue Jul 17 06:32:45 2012 +0300
[bugfix] Always #include <lst.h> before using lst. Fixes build error on MinGW.
[temp.expl.spec] says:
6 If a template, a member template or the member of a class template
is explicitly specialized then that specialization shall be declared
before the first use of that specialization that would cause an implicit
instantiation to take place, in every translation unit in which such a
use occurs; no diagnostic is required. If the program does not provide
a definition for an explicit specialization and either the specialization
is used in a way that would cause an implicit instantiation to take place
or the member is a virtual member function, the program is ill-formed,
no diagnostic required. An implicit instantiation is never generated for
an explicit specialization that is declared but not defined.
Apparently we are breaking this rule (presumably since the commit 99901bd5c742
`Parser can now read GiNaC lists (lst) defined by braces.'). In particular,
parser.cpp does not include lst.h (neither directly nor indirectly) which
contains explicit specialization of lst::info(). However, parser.cpp
(indirectly) includes both container.h and registar.h, so the GiNaC::lst type
is declared (and is complete) before the first usage. Thus lst::info() gets
implicitly instantiated (using the general definition provided in container.h)
when compiling the parser.cpp file, and libginac fails to link properly due
to mutliply defined symbols:
libtool: link: ccache i686-w64-mingw32-g++ -shared -nostdlib /usr/lib/gcc/i686-w64-mingw32/4.6/../../../../i686-w64-mingw32/lib/../lib/dllcrt2.o /usr/lib/gcc/i686-w64-mingw32/4.6/crtbegin.o .libs/add.o .libs/archive.o .libs/basic.o .libs/clifford.o .libs/color.o .libs/constant.o .libs/ex.o .libs/excompiler.o .libs/expair.o .libs/expairseq.o .libs/exprseq.o .libs/fail.o .libs/factor.o .libs/fderivative.o .libs/function.o .libs/idx.o .libs/indexed.o .libs/inifcns.o .libs/inifcns_trans.o .libs/inifcns_gamma.o .libs/inifcns_nstdsums.o .libs/integral.o .libs/lst.o .libs/matrix.o .libs/mul.o .libs/ncmul.o .libs/normal.o .libs/numeric.o .libs/operators.o .libs/power.o .libs/registrar.o .libs/relational.o .libs/remember.o .libs/pseries.o .libs/print.o .libs/symbol.o .libs/symmetry.o .libs/tensor.o .libs/utils.o .libs/wildcard.o .libs/parse_binop_rhs.o .libs/parser.o .libs/parse_context.o .libs/default_reader.o .libs/lexer.o .libs/parser_compat.o .libs/mod_gcd.o .libs/cra_garner.o .libs/upoly_io.o .libs/gcd_uvar.o .libs/chinrem_gcd.o .libs/collect_vargs.o .libs/divide_in_z_p.o .libs/mgcd.o .libs/optimal_vars_finder.o .libs/pgcd.o .libs/primpart_content.o -L/home/build/GiNaC.pkg/mk/ginac/../../build-tree/inst/all/opt/i686-w64-mingw32/ginac/lib -lcln -L/usr/lib/gcc/i686-w64-mingw32/4.6 -L/usr/lib/gcc/i686-w64-mingw32/4.6/../../../../i686-w64-mingw32/lib/../lib -L/usr/lib/gcc/i686-w64-mingw32/4.6/../../../../i686-w64-mingw32/lib -lstdc++ -lmingw32 -lgcc_s -lgcc -lmoldname -lmingwex -lmsvcrt -ladvapi32 -lshell32 -luser32 -lkernel32 -lmingw32 -lgcc_s -lgcc -lmoldname -lmingwex -lmsvcrt /usr/lib/gcc/i686-w64-mingw32/4.6/crtend.o -O2 -march=i686 -Wl,--enable-auto-import -Wl,--export-all-symbols -o .libs/libginac-2.dll -Wl,--enable-auto-image-base -Xlinker --out-implib -Xlinker .libs/libginac.dll.a
Creating library file: .libs/libginac.dll.a
.libs/parser.o: In function `_ZNK5GiNaC9containerISt4listE4infoEj':
/home/build/GiNaC.pkg/mk/ginac/../../ginac/ginac/container.h:359: multiple definition of `GiNaC::container<std::list>::info(unsigned int) const'
.libs/lst.o:/usr/include/c++/4.6/bits/vector.tcc:390: first defined here
collect2: ld returned 1 exit status
make[4]: *** [libginac.la] Error 1
make[4]: Leaving directory `/home/build/GiNaC.pkg/build-tree/build/ginac-1.6.2/ginac'
make[3]: *** [all] Error 2
Thanks to Robert Durkacz for reporting.
-----------------------------------------------------------------------
Summary of changes:
ginac/parser/default_reader.cpp | 1 +
ginac/parser/parser.cpp | 1 +
2 files changed, 2 insertions(+), 0 deletions(-)
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GiNaC -- a C++ library for symbolic computations