ISA-L Cauchy support

This is for supporting ISA-L cauchy based matrix. The difference
from isa_l_rs_vand is only the matrix to use the encode/decode
calculation.

As a known issue, isa_l_rs_vand backend has constraint for the
combinations of the available fragment to be able to
decode/reconstuct. (See related change in detail)

To avoid the constraint, this patch adds another isa-l backend to use
cauchy matrix. The reason I try to add this intead of changing at
sa_l_rs_vand, the isa_l_rs_vand backend may be already used and if we
change the matrix, the current users won't be able to decode the data.

To avoid the problem and keep the backward compatibility, this is in
another isa_l_rs_cauchy namespace.

NOTE: this depends on tag may be meaningless because the depending target
is a c lang project so probably no scripts to install it we have and then,
almost of the tests for isa-l will be skipped due to a lack of isa-l
backend installation.

Related-Change: Icee788a0931fe692fe0de31fabc4ba450e338a87

Depends-On: I6eb150d9d0c3febf233570fa7729f9f72df2e9be

Change-Id: I3a5516545d17ab7ac67a9a3627c85243e2110764

1 files changed, 3 insertions, 0 deletions

diff --git a/src/c/pyeclib_c/pyeclib_c.c b/src/c/pyeclib_c/pyeclib_c.c
index 8e1a23c..40acd39 100644
--- a/src/c/pyeclib_c/pyeclib_c.c
+++ b/src/c/pyeclib_c/pyeclib_c.c
@@ -1004,6 +1004,9 @@ static const char* backend_id_to_str(uint8_t backend_id)
     case 6:
       backend_id_str = "liberasurecode_rs_vand\0";
       break;
+    case 7:
+      backend_id_str = "isa_l_rs_cauchy\0";
+      break;
     default:
       backend_id_str = "unknown\0";
   }