From 7e06671de5bbb2ebe245cc1ec8dc6ca1abc45a07 Mon Sep 17 00:00:00 2001
From: Anthony Islas <aislas@ucar.edu>
Date: Fri, 3 May 2024 13:16:30 -0700
Subject: [PATCH 1/3] Set explicit return on main

---
 tools/fseek_test.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/fseek_test.c b/tools/fseek_test.c
index c1bee099b5..3974de27df 100644
--- a/tools/fseek_test.c
+++ b/tools/fseek_test.c
@@ -6,6 +6,7 @@
 #include <stdlib.h>
 #include <errno.h>
 #include <sys/types.h>
+void
 main()
 {
   FILE *fp ;

From 694d93e86de09c140540973113a87f274407ca61 Mon Sep 17 00:00:00 2001
From: Anthony Islas <aislas@ucar.edu>
Date: Fri, 3 May 2024 13:17:16 -0700
Subject: [PATCH 2/3] Use safer explicit defines that enable fseeko on certain
 systems where not the default

---
 CMakeLists.txt           | 11 +++++++----
 confcheck/CMakeLists.txt |  4 ++--
 2 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0951267f9b..a8e1b5ced3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -792,10 +792,13 @@ endif()
 #!TODO Leaving as is in WRF for now but investigate why we don't do this
 # https://stackoverflow.com/a/1035713
 # If fseeko64 succeeds, use that, else check if we can fall back to fseeko, and if not just use fseek
-if ( ${FSEEKO64} )
-  list( APPEND PROJECT_COMPILE_DEFINITIONS FSEEKO64_OK )
-elseif( "${FSEEKO}" )
-  list( APPEND PROJECT_COMPILE_DEFINITIONS FSEEKO_OK )
+if ( "${FSEEKO64}" OR "${FSEEKO}" )
+  list( APPEND PROJECT_COMPILE_DEFINITIONS _FILE_OFFSET_BITS=64 _LARGEFILE_SOURCE=1 )
+  if ( "${FSEEKO64}" )
+    list( APPEND PROJECT_COMPILE_DEFINITIONS FSEEKO64_OK )
+  elseif( "${FSEEKO}" )
+    list( APPEND PROJECT_COMPILE_DEFINITIONS FSEEKO_OK )
+  endif()
 else()
   list( APPEND PROJECT_COMPILE_DEFINITIONS FSEEK_OK )
 endif()
diff --git a/confcheck/CMakeLists.txt b/confcheck/CMakeLists.txt
index 152aeeaa3a..aab2e3bc69 100644
--- a/confcheck/CMakeLists.txt
+++ b/confcheck/CMakeLists.txt
@@ -49,7 +49,7 @@ wrf_conf_check(
                 RESULT_VAR             FSEEKO64
                 SOURCE                 ${PROJECT_SOURCE_DIR}/tools/fseek_test.c
                 EXTENSION              .c
-                ADDITIONAL_DEFINITIONS -DTEST_FSEEKO64 -DFILE_TO_TEST="${PROJECT_SOURCE_DIR}/CMakeLists.txt"
+                ADDITIONAL_DEFINITIONS -DTEST_FSEEKO64 -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE=1 -DFILE_TO_TEST="${PROJECT_SOURCE_DIR}/CMakeLists.txt"
                 MESSAGE                "fseeko64 not supported, checking alternate fseeko"
                 )
 
@@ -60,7 +60,7 @@ if ( NOT "${FSEEKO64}" )
                   RESULT_VAR             FSEEKO
                   SOURCE                 ${PROJECT_SOURCE_DIR}/tools/fseek_test.c
                   EXTENSION              .c
-                  ADDITIONAL_DEFINITIONS -DTEST_FSEEKO -DFILE_TO_TEST="${PROJECT_SOURCE_DIR}/CMakeLists.txt"
+                  ADDITIONAL_DEFINITIONS -DTEST_FSEEKO -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE=1 -DFILE_TO_TEST="${PROJECT_SOURCE_DIR}/CMakeLists.txt"
                   MESSAGE                "fseeko not supported, compiling with fseek (caution with large files)"
                   )
 endif()

From 7c49e34cba5fb876d4aabca0a7d4d97e39989d00 Mon Sep 17 00:00:00 2001
From: Anthony Islas <aislas@ucar.edu>
Date: Wed, 18 Sep 2024 17:49:12 -0700
Subject: [PATCH 3/3] Use int return value for main

---
 tools/fseek_test.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/fseek_test.c b/tools/fseek_test.c
index 3974de27df..45cccef22f 100644
--- a/tools/fseek_test.c
+++ b/tools/fseek_test.c
@@ -6,7 +6,7 @@
 #include <stdlib.h>
 #include <errno.h>
 #include <sys/types.h>
-void
+int
 main()
 {
   FILE *fp ;
@@ -44,6 +44,6 @@ main()
     retval = 1 ;
   }
   fclose(fp) ;
-  exit(retval) ;
+  return retval ;
 }