BUG: lock umath_linalg lapack calls when no BLAS is detected

Author: ngoldbaum

numpy/_core/config.h.in

@@ -108,6 +108,8 @@
 #mesondefine HAVE_LDOUBLE_IBM_DOUBLE_DOUBLE_LE
 #mesondefine HAVE_LDOUBLE_IBM_DOUBLE_DOUBLE_BE
 
+#mesondefine HAVE_EXTERNAL_LAPACK
+
 #ifndef __cplusplus
 /* #undef inline */
 #endif

numpy/_core/meson.build

@@ -506,6 +506,10 @@ if cc.has_function_attribute('visibility:hidden') and host_machine.system() != '
 endif
 cdata.set('NPY_VISIBILITY_HIDDEN', visibility_hidden)
 
+# if not set, we're using lapack_lite
+if have_lapack
+  cdata.set10('HAVE_EXTERNAL_LAPACK', have_blas)
+endif
 
 config_h = configure_file(
   input: 'config.h.in',