[Qemu-devel] [PATCH for-4.0 v2 2/2] roms: Allow the EDK2_EFIROM variable to be overridden

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

Since commit f590a812c210 we build the EDK2 EfiRom utility
unconditionally. This has been tested on all the Linux
distribution providing continuous integration (namely Debian
and Fedora). Not all distributions are able to build the
EfiRom without specific patches (In particular SUSE which
enforces the PIE protection, see [*]).

Restore the possibility to other distributions to override
the EDK2_EFIROM variable.

[*] https://lists.opensuse.org/opensuse-factory/2017-06/msg00403.html

Reported-by: Olaf Hering <olaf@aepfle.de>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 roms/Makefile | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/roms/Makefile b/roms/Makefile
index d28252dafdf..ea19aa9b33c 100644
--- a/roms/Makefile
+++ b/roms/Makefile
@@ -47,7 +47,11 @@ SEABIOS_EXTRAVERSION="-prebuilt.qemu.org"
 # We need that to combine multiple images (legacy bios,
 # efi ia32, efi x64) into a single rom binary.
 #
-EDK2_EFIROM = edk2/BaseTools/Source/C/bin/EfiRom
+# By default we build the latest EDK2 stable EfiRom utility.
+# If you have to use another one, you can also pass the location on
+# the command line, i.e. "make EDK2_EFIROM=$(type -P EfiRom) efirom"
+#
+EDK2_EFIROM ?= edk2/BaseTools/Source/C/bin/EfiRom
 
 default:
 	@echo "nothing is build by default"
@@ -120,8 +124,11 @@ build-efi-roms: build-pxe-roms
 		$(patsubst %,bin-i386-efi/%.efidrv,$(pxerom_targets)) \
 		$(patsubst %,bin-x86_64-efi/%.efidrv,$(pxerom_targets))
 
+# Do not compile $(EDK2_EFIROM) if the variable is overridden
+ifeq "$(origin EDK2_EFIROM)" "file"
 $(EDK2_EFIROM):
 	$(MAKE) -C edk2/BaseTools
+endif
 
 slof:
 	$(MAKE) -C SLOF CROSS=$(powerpc64_cross_prefix) qemu
-- 
2.20.1