[build] Use -malign-double to build 32-bit UEFI binaries

The EDK2 codebase uses -malign-double for 32-bit builds, which causes
64-bit integers to be naturally aligned.  This affects the layout of
some structures (including EFI_BLOCK_IO_MEDIA).

This mirrors wimboot commit 7b8f39d ("[build] Fix building of 32-bit
UEFI version").

Signed-off-by: Michael Brown <mcb30@ipxe.org>

diff --git a/src/arch/i386/Makefile.efi b/src/arch/i386/Makefile.efi
index 8d651b04dc3963e29eba4e139582050533b5970e..aa809eb5df90ebe53dd8e2c51927034520e54087 100644 (file)
--- a/src/arch/i386/Makefile.efi
+++ b/src/arch/i386/Makefile.efi
@@ -4,6 +4,10 @@
 #
 ELF2EFI                = $(ELF2EFI32)
 
+# Use EFI ABI
+#
+CFLAGS         += -malign-double
+
 # Include generic EFI Makefile
 #
 MAKEDEPS       += arch/x86/Makefile.efi