git: 942815c54820 - main - libefivar: Add note about extra compiler flags

The branch main has been updated by imp:

URL: https://cgit.FreeBSD.org/src/commit/?id=942815c54820783d3d4f7f6faa71ab7919b5f0e5

commit 942815c54820783d3d4f7f6faa71ab7919b5f0e5
Author:     Warner Losh <imp@FreeBSD.org>
AuthorDate: 2023-02-15 23:02:56 +0000
Commit:     Warner Losh <imp@FreeBSD.org>
CommitDate: 2023-02-15 23:03:54 +0000

    libefivar: Add note about extra compiler flags
    
    Add a note about why we need these extra compiler flags to suppress
    warnings. EDK2 upstream code is being used verbatim and as of the last
    update these issuse persist, but are benign.
    
    Sponsored by:           Netflix
    Reviewed by:            asomers
    Differential Revision:  https://reviews.freebsd.org/D38613
---
 lib/libefivar/Makefile | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/libefivar/Makefile b/lib/libefivar/Makefile
index 5a6077d4b8f8..d38d7906af20 100644
--- a/lib/libefivar/Makefile
+++ b/lib/libefivar/Makefile
@@ -64,9 +64,10 @@ WARNS?=		9
 
 .include <bsd.lib.mk>
 
+# We use UEFI parsing and formatting code from upstream EDK2 project.
+# They still have issues that require us to susppress some warnings.
 CWARNFLAGS+=	-Wno-cast-align
 CWARNFLAGS+=	-Wno-unused-parameter
-
 .if ${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 130000
 CWARNFLAGS+=	-Wno-unused-but-set-variable
 .endif