Create shared libraries lib{blas,lapack}.so.3

Forwarded: not-needed
Last-Update: 2020-07-31

* It is done so that duplicate code with libopenblas.so.0 is kept as low as
  possible. Only the symbols from the external BLAS/LAPACK API are incorporated
  in the shared libraries. The rest is obtained by dynamic linking against
  libopenblas.so.0. This also gives access to some extra OpenBLAS symbols, in
  order to differentiate it at runtime from other BLAS implementations (see
  #960728).
  The -rpath,'$ORIGIN' is there to ensure that the OpenBLAS flavour used is
  the one selected in the lib{blas,lapack}.so.3 alternative, and not the one
  selected in the libopenblas.so.0 alternative.
* See also override_dh_shlibdeps in debian/rules
* Also order the files when calling `ar' or $(CC), to make
  the build reproducible (see #824639)
* Also link the shared blas and lapack against gomp (see #945791)
Last-Update: 2020-07-31
Gbp-Pq: Name shared-blas-lapack.patch

diff --git a/interface/Makefile b/interface/Makefile
index ae12823cc0f509ca4b2b4ee545de5682a46d6185..8d094c388beee12e177ce9a00e0bf93e371e1fbc 100644 (file)
--- a/interface/Makefile
+++ b/interface/Makefile
@@ -2343,3 +2343,28 @@ delete-duplicate-lapack-objects:
                && rm $(SLAPACKOBJS) $(DLAPACKOBJS) $(CLAPACKOBJS) $(ZLAPACKOBJS) lsame.o xerbla.o; fi
        if test -d ../lapack64-netlib; then cd ../lapack64-netlib \
                && rm $(SLAPACKOBJS) $(DLAPACKOBJS) $(CLAPACKOBJS) $(ZLAPACKOBJS) lsame.o xerbla.o; fi
+
+shared-blas-lapack: libblas.so.3 liblapack.so.3
+shared-blas64-lapack64: libblas64.so.3 liblapack64.so.3
+ifneq (0,$(USE_OPENMP))
+SH_BLAS_LAPACK_OMP=-fopenmp -lgomp
+endif
+
+# The list of prerequisite is created by comparing with NETLIB BLAS public API.
+# The symbol cblas_xerbla is missing here, but it does not seem to be provided
+# by libopenblas.so.0 either.
+libblas.so.3: $(SBLAS1OBJS) $(SBLAS2OBJS) $(SBLAS3OBJS) $(DBLAS1OBJS) $(DBLAS2OBJS) $(DBLAS3OBJS) $(CBLAS1OBJS) $(CBLAS2OBJS) $(CBLAS3OBJS) $(ZBLAS1OBJS) $(ZBLAS2OBJS) $(ZBLAS3OBJS) ../kernel/lsame.o ../kernel/scabs1.o ../kernel/dcabs1.o ../driver/others/xerbla.o
+       $(CC) $(LDFLAGS) -shared -o $@ $^ -Wl,-soname,libblas.so.3 -L.. -lopenblas $(EXTRALIB) $(SH_BLAS_LAPACK_OMP) -Wl,-rpath,'$$ORIGIN'
+
+libblas64.so.3: $(SBLAS1OBJS) $(SBLAS2OBJS) $(SBLAS3OBJS) $(DBLAS1OBJS) $(DBLAS2OBJS) $(DBLAS3OBJS) $(CBLAS1OBJS) $(CBLAS2OBJS) $(CBLAS3OBJS) $(ZBLAS1OBJS) $(ZBLAS2OBJS) $(ZBLAS3OBJS) ../kernel/lsame.o ../kernel/scabs1.o ../kernel/dcabs1.o ../driver/others/xerbla.o
+       $(CC) $(LDFLAGS) -shared -o $@ $^ -Wl,-soname,libblas64.so.3 -L.. -lopenblas64 $(EXTRALIB) $(SH_BLAS_LAPACK_OMP) -Wl,-rpath,'$$ORIGIN'
+
+# The prerequisites must match the symbols deleted in target delete-duplicate-lapack-objects
+liblapack.so.3: $(SLAPACKOBJS) $(DLAPACKOBJS) $(CLAPACKOBJS) $(ZLAPACKOBJS) ../kernel/lsame.o ../driver/others/xerbla.o
+       $(CC) $(LDFLAGS) -shared -o $@ $^ `LC_ALL=C ls ../lapack-netlib/*` -Wl,-soname,liblapack.so.3 -L.. -lopenblas $(EXTRALIB) $(SH_BLAS_LAPACK_OMP) -Wl,-rpath,'$$ORIGIN'
+
+liblapack64.so.3: $(SLAPACKOBJS) $(DLAPACKOBJS) $(CLAPACKOBJS) $(ZLAPACKOBJS) ../kernel/lsame.o ../driver/others/xerbla.o
+       $(CC) $(LDFLAGS) -shared -o $@ $^ `LC_ALL=C ls ../lapack64-netlib/*` -Wl,-soname,liblapack64.so.3 -L.. -lopenblas64 $(EXTRALIB) $(SH_BLAS_LAPACK_OMP) -Wl,-rpath,'$$ORIGIN'
+
+clean::
+       rm -f libblas.so.3 liblapack.so.3