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[build] Fix ARM32 EFI builds with current EDK2 headers

EDK2 commit 6440385 ("MdePkg/Include: Add enumeration size checks to
Base.h") enforced the UEFI specification mandate that enums should
always be 32 bits.  This revealed a latent bug in iPXE, which does not
build with -fno-short-enums.

Fix by adding -fno-short-enums to CFLAGS for ARM32 EFI builds.

Reported-by: Benjamin S. Allen <>
Signed-off-by: Michael Brown <>
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mcb30 committed Jul 28, 2017
1 parent 1a77466 commit 8866c919f86ad2f00ff63192fa23cd19f749f90f
Showing with 4 additions and 0 deletions.
  1. +4 −0 src/arch/arm32/Makefile.efi
@@ -1,5 +1,9 @@
# -*- makefile -*- : Force emacs to use Makefile mode

# UEFI requires that enums are always 32 bits
CFLAGS += -fno-short-enums

# Specify EFI image builder

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