Add configure option to compile user targets as PIE

Build uset targers as true PIE if user want to keep qemu
self-virtualizable.

v5:
  - Split into to patches: drop link hack and add PIE support
  - do not build PIE by default and drop toolchain check

v4:
  - Add test for toolchain if it has proper PIE support

v3:
  - One more pice of the hack was removed
  - Description updated

v2:
  - Add configure options do enable/disable PIE for usermode targets.
    Disabling can be useful if you build uswing toolchain which has
    broken PIE support. PIE for usermode targets enabled by default.

Signed-off-by: Kirill A. Shutemov <kirill@shutemov.name>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>

1 files changed, 15 insertions, 4 deletions

diff --git a/Makefile.target b/Makefile.target
index 0fe8b6a..6314e0e 100644
--- a/Makefile.target
+++ b/Makefile.target
@@ -31,7 +31,7 @@ all: $(PROGS)
 
 #########################################################
 # cpu emulator library
-libobj-y = exec.o translate-all.o cpu-exec.o translate.o
+libobj-y = exec.o translate-all.o cpu-exec.o translate.o host-utils.o
 libobj-y += tcg/tcg.o tcg/tcg-runtime.o
 libobj-$(CONFIG_SOFTFLOAT) += fpu/softfloat.o
 libobj-$(CONFIG_NOSOFTFLOAT) += fpu/softfloat-native.o
@@ -80,9 +80,9 @@ ifdef CONFIG_LINUX_USER
 
 VPATH+=:$(SRC_PATH)/linux-user:$(SRC_PATH)/linux-user/$(TARGET_ABI_DIR)
 QEMU_CFLAGS+=-I$(SRC_PATH)/linux-user -I$(SRC_PATH)/linux-user/$(TARGET_ABI_DIR)
-
 obj-y = main.o syscall.o strace.o mmap.o signal.o thunk.o \
       elfload.o linuxload.o uaccess.o gdbstub.o gdbstub-xml.o
+obj-y += envlist.o path.o
 
 obj-$(TARGET_HAS_BFLT) += flatload.o
 obj-$(TARGET_HAS_ELFLOAD32) += elfload32.o
@@ -98,7 +98,7 @@ obj-arm-y += arm-semi.o
 
 obj-m68k-y += m68k-sim.o m68k-semi.o
 
-ARLIBS=../libqemu_user.a libqemu.a
+ARLIBS=libqemu.a
 endif #CONFIG_LINUX_USER
 
 #########################################################
@@ -116,6 +116,7 @@ LIBS+=-lmx
 
 obj-y = main.o commpage.o machload.o mmap.o signal.o syscall.o thunk.o \
         gdbstub.o gdbstub-xml.o
+obj-y += envlist.o path.o
 
 obj-i386-y += ioport-user.o
 
@@ -133,13 +134,23 @@ QEMU_CFLAGS+=-I$(SRC_PATH)/bsd-user -I$(SRC_PATH)/bsd-user/$(TARGET_ARCH)
 
 obj-y = main.o bsdload.o elfload.o mmap.o signal.o strace.o syscall.o \
         gdbstub.o gdbstub-xml.o uaccess.o
+obj-y += envlist.o path.o
 
 obj-i386-y += ioport-user.o
 
-ARLIBS=libqemu.a ../libqemu_user.a
+ARLIBS=libqemu.a
 
 endif #CONFIG_BSD_USER
 
+ifdef CONFIG_USER_ONLY
+# hack to compile with -fpie for *-user targets
+obj-y += cutils-user.o cache-utils-user.o
+cutils-user.c cache-utils-user.c:
+	@echo "  LN	$(TARGET_DIR)$@"
+	@ln -s $(SRC_PATH)/$(@:%-user.c=%.c) $@
+endif
+
+
 #########################################################
 # System emulator target
 ifdef CONFIG_SOFTMMU