From 75b973373ed2e9a7a30f62dfe330299306ecff75 Mon Sep 17 00:00:00 2001
From: Julien Olivain <ju.o@free.fr>
Date: Sat, 5 Mar 2022 12:36:09 +0100
Subject: [PATCH] Fix BLAS library integer size detection

When cross-compiling, octave ./configure script fails to detect the BLAS
library integer size and fails with the message:

    configure: error: unrecognized BLAS library integer size

This patch fixes this detection.

Patch adapted from:
https://github.com/openembedded/meta-openembedded/commit/0ad153f721ef99de585c4452a997a7104f45d71d

Signed-off-by: Julien Olivain <ju.o@free.fr>
---
 configure.ac | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/configure.ac b/configure.ac
index 4092e5915d..f4ea2c1987 100644
--- a/configure.ac
+++ b/configure.ac
@@ -757,6 +757,12 @@ if test $ax_blas_ok = no || test $ax_lapack_ok = no; then
   AC_MSG_ERROR([BLAS and LAPACK libraries are required])
 fi
 
+if ac_fn_f77_try_run "$LINENO"; then :
+  ax_cv_blas_integer_size=8
+else
+  ax_cv_blas_integer_size=4
+fi
+
 case $ax_cv_blas_integer_size in
   4)
     HAVE_64_BIT_BLAS=no
-- 
2.39.2