From d941e24d99cb9597fa2fed78371bd900d38d536a Mon Sep 17 00:00:00 2001
From: Martin Kroeker <martin@ruby.chemie.uni-freiburg.de>
Date: Sat, 15 Jul 2023 09:11:18 +0200
Subject: [PATCH] Fix workspace query corner cases to always return at least 1

---
 lapack-netlib/SRC/ztrevc3.f | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lapack-netlib/SRC/ztrevc3.f b/lapack-netlib/SRC/ztrevc3.f
index 6300e80ae..8fb144e0c 100644
--- a/lapack-netlib/SRC/ztrevc3.f
+++ b/lapack-netlib/SRC/ztrevc3.f
@@ -321,9 +321,9 @@
 *
       INFO = 0
       NB = ILAENV( 1, 'ZTREVC', SIDE // HOWMNY, N, -1, -1, -1 )
-      MAXWRK = N + 2*N*NB
+      MAXWRK = MAX( 1, N + 2*N*NB )
       WORK(1) = MAXWRK
-      RWORK(1) = N
+      RWORK(1) = MAX( 1, N )
       LQUERY = ( LWORK.EQ.-1 .OR. LRWORK.EQ.-1 )
       IF( .NOT.RIGHTV .AND. .NOT.LEFTV ) THEN
          INFO = -1