[PATCH] libgcrypt: Allow GRUB to Build With Clang

[Andrew Hamilton <adhamilt@gmail.com>]

Attempts to build GRUB with Clang were failing due to errors
such as:
error: redefinition of typedef 'gcry_md_hd_t' is a C11 feature

Correct this by adding a compiler pramga to disable the
Clang "typedef-redefinition" warnings. This required an update
to crypto.h and the import_gcry.py script to add the pragma
to libgcrypt-grub's types.h due to "u16" and similar types.

Signed-off-by: Andrew Hamilton <adhamilt@gmail.com>
---
 include/grub/crypto.h | 9 +++++++++
 util/import_gcry.py   | 6 +++++-
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/include/grub/crypto.h b/include/grub/crypto.h
index b0d7add1d..55e21de6f 100644
--- a/include/grub/crypto.h
+++ b/include/grub/crypto.h
@@ -245,6 +245,15 @@ typedef struct gcry_md_spec
   struct gcry_md_spec *next;
 } gcry_md_spec_t;
 
+/*
+ * Clang defaults to flagging type redefinitions as warnings.
+ * A few "forward declarations" in this file are needed due
+ * to inter-relationship complexities between GRUB and 
+ * libgcrypt.
+ */
+#ifdef __clang__
+#pragma GCC diagnostic ignored "-Wtypedef-redefinition"
+#endif
 typedef struct gcry_md_handle*gcry_md_hd_t;
 
 struct gcry_mpi;
diff --git a/util/import_gcry.py b/util/import_gcry.py
index 086bde77c..1e23ee760 100644
--- a/util/import_gcry.py
+++ b/util/import_gcry.py
@@ -608,7 +608,11 @@ with codecs.open (os.path.join (cipher_dir_out, "crypto.lst"), "w", "utf-8") as
                 continue
             with codecs.open (infile, "r", "utf-8") as f:
                 if src == "types.h":
-                    fw.write (f.read ().replace ("float f;", "").replace ("double g;", ""))
+                    fw.write (f.read ().replace ("float f;", "").replace ("double g;", "") \
+                     .replace("#ifndef HAVE_BYTE",
+                              "#ifdef __clang__\n" \
+                              "#pragma GCC diagnostic ignored \"-Wtypedef-redefinition\"\n#endif\n" \
+                              "#ifndef HAVE_BYTE"))
                     continue
 
                 if src == "cipher-proto.h":
-- 
2.47.2


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