[PATCH] firmware: don't build hvmloader if it is not needed

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

If rombios, seabios and ovmf are all disabled, don't attempt to build
hvmloader.

This patches fixes the x86 alpine linux builds currently failing in
gitlab-ci.

Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxx>
---
 tools/firmware/Makefile | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/tools/firmware/Makefile b/tools/firmware/Makefile
index 1f27117794..e68cd0d358 100644
--- a/tools/firmware/Makefile
+++ b/tools/firmware/Makefile
@@ -13,7 +13,16 @@ SUBDIRS-$(CONFIG_ROMBIOS) += rombios
 SUBDIRS-$(CONFIG_ROMBIOS) += vgabios
 SUBDIRS-$(CONFIG_IPXE) += etherboot
 SUBDIRS-$(CONFIG_PV_SHIM) += xen-dir
-SUBDIRS-y += hvmloader
+ifeq ($(CONFIG_ROMBIOS),y)
+CONFIG_HVMLOADER ?= y
+endif
+ifeq ($(CONFIG_SEABIOS),y)
+CONFIG_HVMLOADER ?= y
+endif
+ifeq ($(CONFIG_OVMF),y)
+CONFIG_HVMLOADER ?= y
+endif
+SUBDIRS-$(CONFIG_HVMLOADER) += hvmloader
 
 SEABIOSCC ?= $(CC)
 SEABIOSLD ?= $(LD)
-- 
2.17.1