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https://github.com/opencollab/arpack-ng/pull/441
From a3beacc11e2acbe0baf8b301cb47938dcf01e71d Mon Sep 17 00:00:00 2001
From: Sam James <sam@gentoo.org>
Date: Mon, 13 Nov 2023 02:38:46 +0000
Subject: [PATCH] configure.ac: fix bashisms
configure scripts need to be runnable with a POSIX-compliant /bin/sh.
On many (but not all!) systems, /bin/sh is provided by Bash, so errors
like this aren't spotted. Notably Debian defaults to /bin/sh provided
by dash which doesn't tolerate such bashisms as '=='.
This retains compatibility with bash.
Fixes configure warnings/errors like:
```
checking for cheev_ in -llapack... yes
./configure: 8590: test: x: unexpected operator
checking how to print strings... printf
```
--- a/configure.ac
+++ b/configure.ac
@@ -20,7 +20,7 @@ dnl Check for LAPACK libraries
AX_LAPACK([], [AC_MSG_ERROR([cannot find LAPACK libraries])])
AC_ARG_VAR(INTERFACE64, [set to 1 to use the 64-bit integer interface (ILP64) for ARPACK, BLAS and LAPACK])
-if test x"$INTERFACE64" == x"1"; then
+if test x"$INTERFACE64" = x"1"; then
AC_LANG_PUSH([Fortran 77])
AX_CHECK_COMPILE_FLAG(-fdefault-integer-8, FFLAGS="$FFLAGS -fdefault-integer-8",
AX_CHECK_COMPILE_FLAG(-i8, FFLAGS="$FFLAGS -i8",
@@ -191,7 +191,7 @@ AS_IF([test x"$enable_mpi" != x"no"], [
])
dnl TODO: this needs full re-write of parpack to support ILP64...
-if test x"$INTERFACE64" == x"1"; then
+if test x"$INTERFACE64" = x"1"; then
if test x"$enable_mpi" != x"no"; then
AC_MSG_ERROR([Parallel arpack does not support ILP64.])
fi
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