configure.in: fix typo
[barvinok.git] / Makefile.am
blob64a98ac11f86e24a3fa98acc64199f4617d86a54
1 if HAVE_GINAC
2     MAYBE_BERNSTEIN = bernstein
3 endif
4 if BUNDLED_POLYLIB
5     MAYBE_POLYLIB = polylib
6 endif
7 if BUNDLED_PIPLIB
8     MAYBE_PIPLIB = piplib
9 endif
10 if BUNDLED_ISL
11     MAYBE_ISL = isl
12     ISL_LA = $(top_builddir)/isl/libisl.la
13 endif
14 if BUNDLED_ISL_POLYLIB
15     MAYBE_ISL_POLYLIB = isl-polylib
16     ISL_POLYLIB_LA = $(top_builddir)/isl-polylib/libisl-polylib.la
17 endif
18 if BUNDLED_OMEGA
19     MAYBE_OMEGA = omega
20     OMEGA_LA = $(top_builddir)/omega/omega_lib/libomega.la
21 endif
22 if USE_ZSOLVE
23     MAYBE_ZSOLVE = zsolve
24 endif
25 if USE_PARKER
26     MAYBE_PARKER = parker
27 endif
28 SUBDIRS = $(MAYBE_PIPLIB) $(MAYBE_POLYLIB) $(MAYBE_ISL) $(MAYBE_ISL_POLYLIB) \
29                 $(MAYBE_BERNSTEIN) $(MAYBE_OMEGA) \
30                 $(MAYBE_ZSOLVE) $(MAYBE_PARKER) . doc
31 DIST_SUBDIRS = $(MAYBE_PIPLIB) $(MAYBE_POLYLIB) $(MAYBE_ISL) \
32                 $(MAYBE_ISL_POLYLIB) bernstein $(MAYBE_OMEGA) \
33                 zsolve parker doc
35 FORCE:
36 bernstein/libbernstein.la: FORCE
37         cd bernstein; $(MAKE) $(AM_MAKEFLAGS) libbernstein.la
38 polylib/libpolylibgmp.la: FORCE
39         cd polylib; $(MAKE) $(AM_MAKEFLAGS) libpolylibgmp.la
40 piplib/libpiplibMP.la: FORCE
41         cd piplib; $(MAKE) $(AM_MAKEFLAGS) libpiplibMP.la
42 isl/libisl.la: FORCE
43         cd isl; $(MAKE) $(AM_MAKEFLAGS) libisl.la
44 isl-polylib/libisl-polylib.la: FORCE
45         cd isl-polylib; $(MAKE) $(AM_MAKEFLAGS) libisl-polylib.la
46 omega/omega_lib/libomega.la: FORCE
47         cd omega/omega_lib; $(MAKE) $(AM_MAKEFLAGS) libomega.la
48 zsolve/libzsolve.la: FORCE
49         cd zsolve; $(MAKE) $(AM_MAKEFLAGS) libzsolve.la
50 parker/libparker.la: FORCE
51         cd parker; $(MAKE) $(AM_MAKEFLAGS) libparker.la
53 AM_CPPFLAGS = -I$(srcdir)/bernstein/include \
54               @POLYLIB_CPPFLAGS@ @PIPLIB_CPPFLAGS@ @ginac_CFLAGS@ \
55               @NTL_CPPFLAGS@ @ISL_CFLAGS@ @ISL_POLYLIB_CFLAGS@
56 AM_LDFLAGS = @POLYLIB_LDFLAGS@ @PIPLIB_LDFLAGS@ @NTL_LDFLAGS@
58 LIB_ISL = $(ISL_LA) @ISL_LIBS@
59 LIB_ISL_POLYLIB = $(ISL_POLYLIB_LA) @ISL_POLYLIB_LIBS@
61 lib_LTLIBRARIES = libbarvinok-core.la libbarvinok.la
62 bin_PROGRAMS = barvinok_count barvinok_enumerate barvinok_enumerate_e \
63                   barvinok_ehrhart polytope_scan iscc
64 noinst_PROGRAMS = test testlib randomtest \
65                   remove_redundant_equalities \
66                   barvinok_union polytope_volume test_approx \
67                   barvinok_summate verify_lexsmaller \
68                   polyhedron_sample 4coins lexmin @bv_barvinok_bound@ \
69                   @bv_cone_hilbert_basis@ cone_integer_hull \
70                   polytope_lattice_width polytope_minimize \
71                   polyhedron_integer_hull vector_partition_chambers \
72                   semigroup_holes evalue_convert
73 EXTRA_PROGRAMS = barvinok_bound test_bound cone_hilbert_basis
74 pkginclude_HEADERS = \
75     barvinok/NTL_QQ.h \
76     barvinok/barvinok.h \
77     barvinok/util.h \
78     barvinok/evalue.h \
79     barvinok/genfun.h \
80     barvinok/options.h \
81     barvinok/polylib.h \
82     barvinok/sample.h \
83     barvinok/basis_reduction.h \
84     barvinok/bernstein.h
85 nodist_pkginclude_HEADERS = \
86     barvinok/NTL.h \
87     barvinok/set.h
88 LINK = $(CXXLINK)
90 if HAVE_CDDLIB
91     BR_CDD = basis_reduction_cdd.cc initcdd.cc
92     POLYSIGN_CDD = polysign_cddf.cc polysign_cdd.cc
93 endif
94 if HAVE_GLPK
95     BR_GLPK = basis_reduction_glpk.c
96     POLYSIGN_GLPK = polysign_glpk.c
97 endif
98 if HAVE_TOPCOM
99     TOPCOM = topcom.c topcom.h
100 endif
101 if USE_ZSOLVE
102     HILBERT_C = hilbert.c
103 endif
104 libbarvinok_core_la_SOURCES = \
105     barvinok/evalue.h \
106     barvinok/genfun.h \
107     barvinok/util.h \
108     barvinok/barvinok.h \
109     NTL_QQ.cc \
110     basis_reduction.c \
111     basis_reduction_pip.c \
112     basis_reduction_pip_dual.c \
113     evalue.c \
114     genfun.cc \
115     util.c \
116     version.c \
117     bernoulli.c \
118     bernoulli.h \
119     bfcounter.cc \
120     bfcounter.h \
121     binomial.c \
122     binomial.h \
123     conversion.cc \
124     conversion.h \
125     counter.cc \
126     counter.h \
127     decomposer.cc \
128     decomposer.h \
129     dpoly.cc \
130     dpoly.h \
131     euler.cc \
132     euler.h \
133     evalue_isl.c \
134     genfun_constructor.cc \
135     genfun_constructor.h \
136     $(HILBERT_C) \
137     hilbert.h \
138     hull.c \
139     hull.h \
140     ilp.c \
141     ilp.h \
142     lattice_point.cc \
143     lattice_point.h \
144     lattice_width.c \
145     lattice_width.h \
146     laurent.cc \
147     laurent.h \
148     laurent_old.cc \
149     laurent_old.h \
150     normalization.c \
151     normalization.h \
152     options.c \
153     param_polynomial.cc \
154     param_polynomial.h \
155     param_util.c \
156     param_util.h \
157     $(POLYSIGN_CDD) \
158     $(POLYSIGN_GLPK) \
159     polysign.c \
160     polysign_pip.c \
161     polysign_polylib.c \
162     polysign.h \
163     power.h \
164     reduce_domain.c \
165     reduce_domain.h \
166     reducer.cc \
167     reducer.h \
168     remove_equalities.h \
169     remove_equalities.c \
170     sample.c \
171     scale.c \
172     scale.h \
173     scarf.cc \
174     section_array.h \
175     series.cc \
176     $(TOPCOM) \
177     summate.c \
178     summate.h \
179     vertex_cone.cc \
180     vertex_cone.h \
181     volume.c \
182     volume.h \
183     mat_util.cc \
184     mat_util.h \
185     matrix_read.cc \
186     matrix_read.h \
187     barvinok.cc \
188     barvinok_e.cc \
189     $(BR_CDD) \
190     $(BR_GLPK)
191 EXTRA_libbarvinok_core_la_SOURCES = \
192     basis_reduction_cdd.cc \
193     basis_reduction_glpk.c \
194     hilbert.c \
195     polysign_cddf.cc \
196     polysign_cdd.cc \
197     polysign.c \
198     initcdd.cc \
199     initcdd.h \
200     topcom.c \
201     topcom.h
202 if BUNDLED_POLYLIB
203     POLYLIB_LA = $(top_builddir)/polylib/libpolylibgmp.la
204 endif
205 if BUNDLED_PIPLIB
206     PIPLIB_LA = $(top_builddir)/piplib/libpiplibMP.la
207 endif
208 if USE_ZSOLVE
209     ZSOLVE_LA = zsolve/libzsolve.la
210 endif
211 libbarvinok_core_la_LIBADD = @LTLIBOBJS@ $(LIB_ISL_POLYLIB) $(LIB_ISL) \
212                              $(POLYLIB_LA) @POLYLIB_LIBS@ \
213                              $(PIPLIB_LA) @PIPLIB_LIBS@ \
214                              $(ZSOLVE_LA)
215 libbarvinok_core_la_LDFLAGS = @BV_LDFLAGS@ -version-info @versioninfo@ \
216                                 $(AM_LDFLAGS)
217 if HAVE_GINAC
218     BERNSTEIN_CC = bernstein.cc
219 else
220     BERNSTEIN_CC = dummy.c
221 endif
222 libbarvinok_la_SOURCES = \
223     bound_common.c \
224     bound_common.h \
225     $(BERNSTEIN_CC)
226 EXTRA_libbarvinok_la_SOURCES = \
227     bernstein.cc \
228     dummy.c
229 if HAVE_GINAC
230     BERNSTEIN_LA = $(top_builddir)/bernstein/libbernstein.la
231 endif
232 libbarvinok_la_LIBADD = libbarvinok-core.la $(BERNSTEIN_LA)
233 libbarvinok_la_LDFLAGS = @BV_LDFLAGS@ -version-info @versioninfo@ \
234                                 $(AM_LDFLAGS)
235 LDADD = libbarvinok-core.la @ISL_POLYLIB_LIBS@ @ISL_LIBS@ \
236         @POLYLIB_LIBS@ @PIPLIB_LIBS@
238 test_SOURCES = \
239         evalue_read.c \
240         evalue_read.h \
241         test.c
242 testlib_SOURCES = \
243         evalue_read.c \
244         evalue_read.h \
245         testlib.cc
246 barvinok_count_SOURCES = barvinok_count.c
247 barvinok_ehrhart_SOURCES = \
248         barvinok_ehrhart_options.c \
249         barvinok_ehrhart_options.h \
250         barvinok_ehrhart.cc \
251         evalue_convert_options.c \
252         evalue_convert.cc \
253         evalue_convert.h \
254         $(FDSTREAM)
255 barvinok_union_SOURCES = \
256         barvinok_union_options.c \
257         barvinok_union_options.h \
258         barvinok_union.cc
259 if HAVE_OMEGA
260 BEEO_SOURCES = \
261         omega_interface/Exit.cc \
262         omega_interface/convert.h \
263         omega_interface/convert.cc \
264         omega_interface/count.h \
265         omega_interface/count.cc
266 else
267 BEEO_SOURCES = 
268 endif
269 if USE_FDSTREAM
270 FDSTREAM = fdstream.cc fdstream.h
271 endif
272 barvinok_enumerate_SOURCES = \
273         barvinok_enumerate_options.c \
274         barvinok_enumerate_options.h \
275         barvinok_enumerate.cc \
276         evalue_convert_options.c \
277         evalue_convert.cc \
278         evalue_convert.h \
279         $(FDSTREAM) \
280         skewed_genfun.cc \
281         skewed_genfun.h \
282         verify.h \
283         verify.c \
284         verif_ehrhart.h \
285         verif_ehrhart.c \
286         verify_series.h \
287         verify_series.cc
288 EXTRA_barvinok_enumerate_SOURCES = fdstream.cc fdstream.h
289 barvinok_enumerate_e_SOURCES = \
290         barvinok_enumerate_e_options.c \
291         barvinok_enumerate_e_options.h \
292         barvinok_enumerate_e.cc \
293         evalue_convert_options.c \
294         evalue_convert.cc \
295         evalue_convert.h \
296         $(FDSTREAM) \
297         skewed_genfun.cc \
298         skewed_genfun.h \
299         verify.h \
300         verify.c \
301         verif_ehrhart.h \
302         verif_ehrhart.c \
303         verify_series.h \
304         verify_series.cc \
305         $(BEEO_SOURCES)
306 EXTRA_barvinok_enumerate_e_SOURCES = fdstream.cc fdstream.h
307 if USE_PARKER
308     MONA_LIBS = -ldfa -lbdd -lmem
309     PARKER_LA = parker/libparker.la
310     PARKERLDFLAGS = -L$(MONAPATH)/DFA -L$(MONAPATH)/BDD -L$(MONAPATH)/Mem
311     PARKERCPPFLAGS = -I$(MONAPATH)/Mem -I$(MONAPATH)/DFA -I$(MONAPATH)/BDD
312 endif
313 barvinok_enumerate_e_CPPFLAGS = \
314         $(PARKERCPPFLAGS) @OMEGA_CPPFLAGS@ $(AM_CPPFLAGS)
315 barvinok_enumerate_e_LDFLAGS = $(PARKERLDFLAGS) @OMEGA_LDFLAGS@ @LDFLAGS@
316 barvinok_enumerate_e_LDADD = \
317         $(PARKER_LA) $(MONA_LIBS) @OMEGA_LIBS@ $(OMEGA_LA) libbarvinok-core.la \
318         @ISL_POLYLIB_LIBS@ @ISL_LIBS@ @POLYLIB_LIBS@ @PIPLIB_LIBS@
319 barvinok_bound_SOURCES = \
320         evalue_convert_options.c \
321         evalue_convert.cc \
322         evalue_convert.h \
323         evalue_read.c \
324         evalue_read.h \
325         $(FDSTREAM) \
326         bound_options.h \
327         bound_options.c \
328         bound.cc \
329         verify.h \
330         verify.c
331 EXTRA_barvinok_bound_SOURCES = fdstream.cc fdstream.h
332 barvinok_bound_LDADD = \
333         libbarvinok-core.la libbarvinok.la @ISL_POLYLIB_LIBS@ @ISL_LIBS@ \
334         @POLYLIB_LIBS@ @PIPLIB_LIBS@
335 barvinok_summate_SOURCES = \
336         barvinok_summate_options.c \
337         barvinok_summate_options.h \
338         barvinok_summate.cc \
339         evalue_convert_options.c \
340         evalue_convert.cc \
341         evalue_convert.h \
342         evalue_read.c \
343         evalue_read.h \
344         $(FDSTREAM) \
345         verify.h \
346         verify.c
347 EXTRA_barvinok_summate_SOURCES = fdstream.cc fdstream.h
348 4coins_SOURCES = 4coins.cc
349 semigroup_holes_SOURCES = semigroup_holes.cc
350 lexmin_SOURCES = \
351         lexmin_options.c \
352         lexmin.h \
353         lexmin.cc \
354         combine.c \
355         combine.h \
356         edomain.cc \
357         edomain.h \
358         evalue_util.cc \
359         evalue_util.h \
360         verify.h \
361         verify.c
362 test_approx_SOURCES = \
363         test_approx.c \
364         verify.h \
365         verify.c
366 test_bound_SOURCES = \
367         test_bound.c \
368         evalue_convert_options.c \
369         evalue_convert.cc \
370         evalue_convert.h \
371         evalue_read.c \
372         evalue_read.h \
373         $(FDSTREAM) \
374         verify.h \
375         verify.c
376 EXTRA_test_bound_SOURCES = fdstream.cc fdstream.h
377 test_bound_LDADD = \
378         libbarvinok-core.la libbarvinok.la @ISL_POLYLIB_LIBS@ @ISL_LIBS@ \
379         @POLYLIB_LIBS@ @PIPLIB_LIBS@
380 evalue_convert_SOURCES = \
381         evalue_convert_main.c \
382         evalue_convert_options.c \
383         evalue_convert.cc \
384         evalue_convert.h \
385         evalue_read.c \
386         evalue_read.h \
387         $(FDSTREAM)
388 iscc_SOURCES =  \
389         isl_obj_list.h \
390         isl_obj_list.c \
391         iscc.c
392 iscc_LDADD = \
393         libbarvinok.la libbarvinok-core.la @ISL_POLYLIB_LIBS@ @ISL_LIBS@ \
394         @POLYLIB_LIBS@ @PIPLIB_LIBS@
396 TESTFILES = $(shell find $(top_srcdir)/tests -type f ! -path '*CVS*')
398 EXTRA_DIST = \
399     ChangeLog \
400     $(TESTFILES) \
401     latte2polylib.pl \
402     NTL_5_3_2.patch \
403     basis_reduction_templ.c \
404     cdd94e-test \
405     polysign_cdd_template.cc \
406     barvinok/NTL.h.broken \
407     barvinok/NTL.h.normal \
408     barvinok/set.h.broken \
409     barvinok/set.h.normal \
410     doc/isl.tex \
411     doc/Internal.tex \
412     doc/applications.tex \
413     doc/barvinok.tex \
414     doc/omega.tex \
415     doc/polymake.tex \
416     doc/reports.tex \
417     doc/barvinok.bib \
418     doc/barvinok.gdf \
419     doc/chicago.bst \
420     doc/chicago.sty \
421     doc/mydefs.sty \
422     polymake/Makefile.in \
423     polymake/README \
424     polymake/autogen.sh \
425     polymake/configure.in \
426     polymake/convert.cc \
427     polymake/convert.h \
428     polymake/h_star_vector.cc \
429     polymake/lattice_points.cc
431 ACLOCAL_AMFLAGS = -I m4
433 install-data-local:
434         @test -z "$(pkgconfig_libdir)" || $(mkdir_p) "$(DESTDIR)$(pkgconfig_libdir)"
435         $(INSTALL_DATA) $(pkgconfig_libfile) "$(DESTDIR)$(pkgconfig_libdir)/$(pkgconfig_libfile)"
437 uninstall-local:
438         rm -f "$(DESTDIR)$(pkgconfig_libdir)/$(pkgconfig_libfile)"
440 dist-hook:
441         (cd $(distdir)/polymake; \
442             ./autogen.sh; rm -rf autogen.sh autom4te.cache)
443         (cd doc; make barvinok.pdf)
444         cp doc/barvinok.pdf $(distdir)/doc/
445         if test -f $(top_srcdir)/.git/HEAD; then \
446             echo @GIT_HEAD_VERSION@ > $(distdir)/GIT_HEAD_ID; \
447         else \
448             echo $(GIT_HEAD_ID) > $(distdir)/GIT_HEAD_ID; \
449         fi
451 dist-git: dist
452         mv $(distdir).tar.gz @GIT_HEAD_VERSION@.tar.gz
454 BEE_TESTDIRS = ehrhart_e ehrhart_e/scarf ehrhart_e/piplib
456 check: check-testlib check-enumerate check-enumerate_e check-test \
457         check-lexmin check-approx check-evalue check-euler check-lw
458 check-testlib: testlib$(EXEEXT)
459         ./testlib$(EXEEXT)
460 check-approx: test_approx$(EXEEXT)
461         @for i in $(top_srcdir)/tests/ehrhart/*; do \
462             if test -f $$i; then \
463                 echo $$i | ./test_approx$(EXEEXT) -q -r 10 || exit; \
464             fi \
465         done
466 check-evalue: @bv_barvinok_bound@ barvinok_summate$(EXEEXT)
467         @for i in $(top_srcdir)/tests/evalue/*; do \
468             if test -f $$i; then \
469                 echo $$i; \
470                 if test -n "@bv_barvinok_bound@"; then \
471                     ./barvinok_bound$(EXEEXT) -T -r30 < $$i || exit; \
472                     echo $$i | ./test_bound$(EXEEXT) -q -r30 || exit; \
473                 fi; \
474                 ./barvinok_summate$(EXEEXT) -T -r30 < $$i || exit; \
475             fi \
476         done
477 check-euler: barvinok_summate$(EXEEXT)
478         @for i in $(top_srcdir)/tests/euler/*; do \
479             if test -f $$i; then \
480                 for method in 'euler' 'laurent_old' 'laurent'; do \
481                     opt="--summation=$$method"; \
482                     echo $$i $$opt; \
483                     ./barvinok_summate$(EXEEXT) -T $$opt < $$i || exit; \
484                 done \
485             fi \
486         done
487 if HAVE_TOPCOM
488     TOPCOM_CD = '--chamber-decomposition=topcom'
489 endif
490 check-enumerate: barvinok_enumerate$(EXEEXT)
491         @for i in $(top_srcdir)/tests/ehrhart/*; do \
492             if test -f $$i; then \
493                 echo $$i; \
494                 for options in '' '--series' '--series --primal' $(TOPCOM_CD); do \
495                     for spec in 'random' 'bf' 'df'; do \
496                         opt="--specialization=$$spec $$options"; \
497                         echo "        $$opt"; \
498                         ./barvinok_enumerate$(EXEEXT) --verify $$opt < $$i || exit; \
499                     done \
500                 done; \
501                 opt="--summation=bernoulli"; \
502                 echo "        $$opt"; \
503                 ./barvinok_enumerate$(EXEEXT) --verify $$opt < $$i || exit; \
504             fi \
505         done
506 if HAVE_OMEGA
507     SPEC_OMEGA = '--isl --omega'
508 endif
509 check-enumerate_e: barvinok_enumerate_e$(EXEEXT)
510         @for dir in $(BEE_TESTDIRS); do \
511             for i in $(top_srcdir)/tests/$$dir/*; do \
512                 if test -f $$i; then \
513                     for options in '' $(SPEC_OMEGA) '--isl'; do \
514                         for spec in 'random' 'bf' 'df'; do \
515                             opt="--specialization=$$spec $$options"; \
516                             echo $$i $$opt; \
517                             ./barvinok_enumerate_e$(EXEEXT) --verify $$opt < $$i || exit; \
518                         done \
519                     done \
520                 fi \
521             done \
522         done
523         @for i in $(top_srcdir)/tests/ehrhart_e/scarf/*; do \
524             if test -f $$i; then \
525                 for spec in 'random' 'bf' 'df'; do \
526                     opt="--specialization=$$spec --scarf"; \
527                     echo $$i $$opt; \
528                     ./barvinok_enumerate_e$(EXEEXT) --verify $$opt < $$i || exit; \
529                 done; \
530                 echo $$i --series; \
531                 ./barvinok_enumerate_e$(EXEEXT) --verify --series < $$i || exit; \
532             fi \
533         done
534 check-test: test$(EXEEXT)
535         @failed=0; \
536         for i in $(top_srcdir)/tests/*; do \
537             if test -f $$i; then \
538                 for options in '--index=10' '--primal --index=10'; do \
539                     for spec in 'random' 'bf' 'df' 'todd'; do \
540                         opt="--specialization=$$spec $$options"; \
541                         echo -n $$i $$opt; \
542                         ./test$(EXEEXT) $$opt < $$i; \
543                         if test "$$?" -ne "0"; then \
544                             failed=`expr $$failed + 1`; \
545                             echo " NOT ok"; \
546                         else \
547                             echo " ok"; \
548                         fi; \
549                     done \
550                 done \
551             fi \
552         done; \
553         for i in $(top_srcdir)/tests/sample/*; do \
554             echo -n $$i; \
555             ./test$(EXEEXT) < $$i; \
556             if test "$$?" -ne "0"; then \
557                 failed=`expr $$failed + 1`; \
558                 echo " NOT ok"; \
559             else \
560                 echo " ok"; \
561             fi; \
562         done; \
563         if test $$failed != 0; then \
564                 echo "$$failed tests failed"; \
565                 exit -1; \
566         fi
567 check-lw: test$(EXEEXT)
568         @failed=0; \
569         for i in $(top_srcdir)/tests/lattice_width/*; do \
570             if test -f $$i; then \
571                 echo -n $$i; \
572                 ./test$(EXEEXT) < $$i; \
573                 if test "$$?" -ne "0"; then \
574                     failed=`expr $$failed + 1`; \
575                     echo " NOT ok"; \
576                 else \
577                     echo " ok"; \
578                 fi; \
579             fi \
580         done; \
581         if test $$failed != 0; then \
582                 echo "$$failed tests failed"; \
583                 exit -1; \
584         fi
585 if HAVE_GLPK
586 check-lexmin: lexmin$(EXEEXT)
587         @for i in $(top_srcdir)/tests/lexmin/*; do \
588             if test -f $$i; then \
589                 for spec in 'random' 'bf' 'df'; do \
590                     opt="--specialization=$$spec"; \
591                     echo $$i $$opt; \
592                     ./lexmin$(EXEEXT) --verify $$opt < $$i || exit; \
593                 done \
594             fi \
595         done
596 else
597 check-lexmin:
598 endif
600 version.h: @GIT_HEAD@
601         echo '#define GIT_HEAD_ID "'@GIT_HEAD_VERSION@'"' > $@