From d0e8878ad4e8b2a24014bfb08b2f93dbd9595950 Mon Sep 17 00:00:00 2001
From: Allen Byrne <50328838+byrnHDF@users.noreply.github.com>
Date: Thu, 4 May 2023 08:43:23 -0500
Subject: Force lowercase Fortran module file names (#2892)

---
 config/cmake/HDF5UseFortran.cmake | 6 ++++++
 release_docs/RELEASE.txt          | 6 ++++++
 2 files changed, 12 insertions(+)

diff --git a/config/cmake/HDF5UseFortran.cmake b/config/cmake/HDF5UseFortran.cmake
index aae7078..3e058ad 100644
--- a/config/cmake/HDF5UseFortran.cmake
+++ b/config/cmake/HDF5UseFortran.cmake
@@ -17,6 +17,12 @@
 enable_language (Fortran)
 
 set (HDF_PREFIX "H5")
+
+# Force lowercase Fortran module file names
+if (CMAKE_Fortran_COMPILER_ID STREQUAL "Cray")
+  set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -ef")
+endif ()
+
 include (CheckFortranFunctionExists)
 
 include (CheckFortranSourceRuns)
diff --git a/release_docs/RELEASE.txt b/release_docs/RELEASE.txt
index ec82272..cf7303e 100644
--- a/release_docs/RELEASE.txt
+++ b/release_docs/RELEASE.txt
@@ -446,6 +446,12 @@ Bug Fixes since HDF5-1.14.0 release
 
       Fixes GitHub issues #1546 and #2259
 
+    - Force lowercase Fortran module file names
+
+      The Cray Fortran compiler  uses  uppercase Fortran module file names, which
+      caused CMake installs to fail. A compiler option was added to use lowercase
+      instead.
+
 
     Tools
     -----
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