From c39585dc93b3ac1262ff8c9bb448b03f19c4ca5a Mon Sep 17 00:00:00 2001
From: Shahram Najm <masn@ecmwf.int>
Date: Wed, 5 Aug 2020 15:21:25 +0100
Subject: [PATCH] ECC-1141: Compile error on MinGW: undefined reference to
 'realpath'

---
 CMakeLists.txt      |  1 +
 eccodes_config.h.in | 10 ++++++----
 src/grib_context.c  |  7 ++++---
 3 files changed, 11 insertions(+), 7 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0d6b2c4c8..de667e7d7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -49,6 +49,7 @@ check_symbol_exists( fseeko           "stdio.h"    ECCODES_HAVE_FSEEKO )
 check_symbol_exists( posix_memalign   "stdlib.h"   ECCODES_HAVE_POSIX_MEMALIGN )
 check_symbol_exists( fmemopen         "stdio.h"    ECCODES_HAVE_FMEMOPEN )
 check_symbol_exists( funopen          "stdio.h"    ECCODES_HAVE_FUNOPEN )
+check_symbol_exists( realpath         "stdlib.h"   ECCODES_HAVE_REALPATH )
 
 check_c_source_compiles(
       " typedef int foo_t;
diff --git a/eccodes_config.h.in b/eccodes_config.h.in
index 6cdae518c..6c00bc7bb 100644
--- a/eccodes_config.h.in
+++ b/eccodes_config.h.in
@@ -50,6 +50,7 @@
 #cmakedefine ECCODES_HAVE_POSIX_MEMALIGN
 #cmakedefine ECCODES_HAVE_FMEMOPEN
 #cmakedefine ECCODES_HAVE_FUNOPEN
+#cmakedefine ECCODES_HAVE_REALPATH
 
 #if defined(EC_HAVE_ASSERT_H) || defined(ECCODES_HAVE_ASSERT_H)
 #define   HAVE_ASSERT_H 1
@@ -64,15 +65,15 @@
 #endif
 
 #if defined(EC_HAVE_SYS_STAT_H) || defined(ECCODES_HAVE_SYS_STAT_H)
-#define    HAVE_SYS_STAT_H 1
+#define   HAVE_SYS_STAT_H 1
 #endif
 
 #if defined(EC_HAVE_FCNTL_H) || defined(ECCODES_HAVE_FCNTL_H)
-#define    HAVE_FCNTL_H 1
+#define   HAVE_FCNTL_H 1
 #endif
 
 #if defined(EC_HAVE_UNISTD_H) || defined(ECCODES_HAVE_UNISTD_H)
-#define    HAVE_UNISTD_H 1
+#define   HAVE_UNISTD_H 1
 #endif
 
 #if defined(EC_HAVE_FSEEKO) || defined(ECCODES_HAVE_FSEEKO)
@@ -80,9 +81,10 @@
 #endif
 
 #if defined(EC_HAVE_POSIX_MEMALIGN) || defined(ECCODES_HAVE_POSIX_MEMALIGN)
-#define         POSIX_MEMALIGN 1
+#define   POSIX_MEMALIGN 1
 #endif
 
+
 /* other */
 
 #define IEEE_BE @IEEE_BE@
diff --git a/src/grib_context.c b/src/grib_context.c
index 350ad0a1a..5feeb6f66 100644
--- a/src/grib_context.c
+++ b/src/grib_context.c
@@ -607,9 +607,7 @@ grib_context* grib_context_new(grib_context* parent)
 static char* resolve_path(grib_context* c, char* path)
 {
     char* result = NULL;
-#ifdef ECCODES_ON_WINDOWS
-    result = grib_context_strdup(c, path);
-#else
+#if defined(ECCODES_HAVE_REALPATH)
     char resolved[ECC_PATH_MAXLEN + 1];
     if (!realpath(path, resolved)) {
         result = grib_context_strdup(c, path); /* Failed to resolve. Use original path */
@@ -617,7 +615,10 @@ static char* resolve_path(grib_context* c, char* path)
     else {
         result = grib_context_strdup(c, resolved);
     }
+#else
+    result = grib_context_strdup(c, path);
 #endif
+
     return result;
 }