[RFC PATCH 12/12] configure: enable cross compilation of vof

[Paolo Bonzini <pbonzini@redhat.com>]

While container-based cross compilers are not supported, this already
makes it possible to build vof on any machine that has an installation
of GCC and binutils for 32- or 64-bit PowerPC.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 configure            | 10 ++++++++++
 pc-bios/vof/Makefile | 17 +++++++++--------
 2 files changed, 19 insertions(+), 8 deletions(-)

diff --git a/configure b/configure
index 6b8e2e2fdb..1db1eef7b1 100755
--- a/configure
+++ b/configure
@@ -2232,6 +2232,7 @@ LINKS="Makefile"
 LINKS="$LINKS tests/tcg/Makefile.target"
 LINKS="$LINKS pc-bios/optionrom/Makefile"
 LINKS="$LINKS pc-bios/s390-ccw/Makefile"
+LINKS="$LINKS pc-bios/vof/Makefile"
 LINKS="$LINKS .gdbinit scripts" # scripts needed by relative path in .gdbinit
 LINKS="$LINKS tests/avocado tests/data"
 LINKS="$LINKS tests/qemu-iotests/check"
@@ -2269,6 +2270,15 @@ if test -n "$target_cc" &&
     fi
 fi
 
+probe_target_compilers ppc ppc64
+if test -n "$target_cc" && test "$softmmu" = yes; then
+    roms="$roms vof"
+    config_mak=pc-bios/vof/config.mak
+    echo "# Automatically generated by configure - do not modify" > $config_mak
+    echo "SRC_DIR=$source_path/pc-bios/vof" >> $config_mak
+    write_target_makefile >> $config_mak
+fi
+
 # Only build s390-ccw bios the compiler has -march=z900 or -march=z10 (which is
 # the lowest architecture level that Clang supports)
 probe_target_compiler s390x
diff --git a/pc-bios/vof/Makefile b/pc-bios/vof/Makefile
index aa1678c4d8..391ac0d600 100644
--- a/pc-bios/vof/Makefile
+++ b/pc-bios/vof/Makefile
@@ -1,11 +1,10 @@
-all: build-all
+include config.mak
+VPATH=$(SRC_DIR)
+all: vof.bin
 
-build-all: vof.bin
-
-CROSS ?=
-CC = $(CROSS)gcc
-LD = $(CROSS)ld
-OBJCOPY = $(CROSS)objcopy
+CC ?= $(CROSS)gcc
+LD ?= $(CROSS)ld
+OBJCOPY ?= $(CROSS)objcopy
 
 %.o: %.S
 	$(CC) -m32 -mbig-endian -mcpu=power4 -c -o $@ $<
@@ -14,10 +13,12 @@ OBJCOPY = $(CROSS)objcopy
 	$(CC) -m32 -mbig-endian -mcpu=power4 -c -fno-stack-protector -o $@ $<
 
 vof.elf: entry.o main.o ci.o bootmem.o libc.o
-	$(LD) -nostdlib -e_start -Tvof.lds -EB -o $@ $^
+	$(LD) -nostdlib -e_start -T$(SRC_DIR)/vof.lds -EB -o $@ $^
 
 %.bin: %.elf
 	$(OBJCOPY) -O binary -j .text -j .data -j .toc -j .got2 $^ $@
 
 clean:
 	rm -f *.o vof.bin vof.elf *~
+
+.PHONY: all clean
-- 
2.35.1