Some more tweaks for JuliaLang#5050

DISTRIBUTING.md

@@ -104,6 +104,12 @@ called `USE_BLAS64` is available as part of the Julia build. When doing
 `make USE_BLAS64=0`, Julia will call BLAS and LAPACK assuming a 32-bit
 API, where all integers are 32-bit wide, even on a 64-bit architecture.
 
+Other libraries that Julia uses, such as ARPACK and SuiteSparse also
+use BLAS and LAPACK internally. The APIs need to be consistent across
+all libraries that depend on BLAS and LAPACK. The Julia build process
+will build all these libraries correctly, but when overriding defaults
+and using system provided libraries, this consistency must be ensured.
+
 
 Compilation scripts
 ===================

base/linalg/lapack.jl

@@ -3304,17 +3304,4 @@ for (fn, elty) in ((:dtrttf_, :Float64),
  end
 end
 
-#
-# Build-time check if BlasInt is of the correct expected bitsize
-#
-_, _info = potrf!('U', [[1.0, 0.0] [0.0, -1.0]])
-if _info!=2 #mangled info code
- if _info == 2^33
- error("""Wrong size of BlasInt for LAPACK: LAPACK was compiled with 32-bit integer support but Julia expects 64-bit integers. Please check the BLAS and LAPACK libraries your system is using or recompile OpenBLAS with the correct USE_BLAS64 settings.""")
- elseif _info == 0
- error("""Wrong size of BlasInt for LAPACK: LAPACK was compiled with 64-bit integer support but Julia expects 32-bit integers. Please check the BLAS and LAPACK libraries your system is using or recompile OpenBLAS with the correct USE_BLAS64 settings.""")
- else
- error("""Unparseable LAPACK info code: Julia did not understand the error codes used by your LAPACK library. Please check the BLAS and LAPACK libraries your system is using or recompile OpenBLAS.""")
- end
-end
 end # module

base/util.jl

@@ -324,6 +324,21 @@ function check_blas()
  quit()
  end
  end
+
+ #
+ # Check if BlasInt is the expected bitsize, by triggering an error
+ #
+ (_, info) = LinAlg.LAPACK.potrf!('U', [1.0 0.0; 0.0 -1.0])
+ if info != 2 # mangled info code
+ if info == 2^33
+ error("""BLAS and LAPACK are compiled with 32-bit integer support, but Julia expects 64-bit integers. Please build Julia with USE_BLAS64=0.""")
+ elseif info == 0
+ error("""BLAS and LAPACK are compiled with 64-bit integer support but Julia expects 32-bit integers. Please build Julia with USE_BLAS64=1.""")
+ else
+ error("""The LAPACK library produced an undefined error code. Please verify the installation of BLAS and LAPACK.""")
+ end
+ end
+
 end
 
 # system information