From: Philippe Mathieu-Daudé <f4...@amsat.org>
QEMU requires libfdt version >= 1.4.2.
If the host has an older libfdt installed, the configure script will use
a (git cloned) local version.
Example with Debian 8:
$ dpkg-query --showformat='${Version}\n' --show libfdt-dev
1.4.0+dfsg-1
$ ./configure
[...]
fdt support yes # from git submodule 'dtc'
If this case occurs, the linker will have 2 different libfdt available in
the library search path. The default behavior is to search the system path
first, then the local path.
Even if the configure script noticed the libfdt is too old and clone a more
recent locally, when linking the system library is selected first, and the
link process eventually fails:
LINK mips64el-softmmu/qemu-system-mips64el
../hw/core/loader-fit.o: In function `load_fit':
/root/src/github.com/philmd/qemu/hw/core/loader-fit.c:278: undefined
reference to `fdt_first_subnode'
/root/src/github.com/philmd/qemu/hw/core/loader-fit.c:286: undefined
reference to `fdt_next_subnode'
/root/src/github.com/philmd/qemu/hw/core/loader-fit.c:277: undefined
reference to `fdt_first_subnode'
collect2: error: ld returned 1 exit status
Makefile:201: recipe for target 'qemu-system-mips64el' failed
make[1]: *** [qemu-system-mips64el] Error 1
QEMU already uses a kludge to enforce local CFLAGS before system ones for
libpixman and libfdt, add a similar kludge for the LDFLAGS to enforce using
the local libfdt.
Signed-off-by: Philippe Mathieu-Daudé <f4...@amsat.org>
Message-Id: <20180415230522.24404-2-f4...@amsat.org>
Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
Reviewed-by: Thomas Huth <th...@redhat.com>
---
configure | 6 +++++-
rules.mak | 2 +-
2 files changed, 6 insertions(+), 2 deletions(-)
diff --git a/configure b/configure
index 3ff4d77..43756dc 100755
--- a/configure
+++ b/configure
@@ -3800,7 +3800,8 @@ EOF
symlink "$source_path/dtc/scripts" "dtc/scripts"
fi
fdt_cflags="-I\$(SRC_PATH)/dtc/libfdt"
- fdt_libs="-L\$(BUILD_DIR)/dtc/libfdt $fdt_libs"
+ fdt_ldflags="-L\$(BUILD_DIR)/dtc/libfdt"
+ fdt_libs="$fdt_libs"
elif test "$fdt" = "yes" ; then
# Not a git build & no libfdt found, prompt for system install
error_exit "DTC (libfdt) version >= 1.4.2 not present." \
@@ -5742,6 +5743,7 @@ echo_version() {
# prepend pixman and ftd flags after all config tests are done
QEMU_CFLAGS="$pixman_cflags $fdt_cflags $QEMU_CFLAGS"
+QEMU_LDFLAGS="$fdt_ldflags $QEMU_LDFLAGS"
libs_softmmu="$pixman_libs $libs_softmmu"
echo "Install prefix $prefix"
@@ -5772,6 +5774,7 @@ echo "ARFLAGS $ARFLAGS"
echo "CFLAGS $CFLAGS"
echo "QEMU_CFLAGS $QEMU_CFLAGS"
echo "LDFLAGS $LDFLAGS"
+echo "QEMU_LDFLAGS $QEMU_LDFLAGS"
echo "make $make"
echo "install $install"
echo "python $python"
@@ -6706,6 +6709,7 @@ else
fi
echo "LDFLAGS=$LDFLAGS" >> $config_host_mak
echo "LDFLAGS_NOPIE=$LDFLAGS_NOPIE" >> $config_host_mak
+echo "QEMU_LDFLAGS=$QEMU_LDFLAGS" >> $config_host_mak
echo "LD_REL_FLAGS=$LD_REL_FLAGS" >> $config_host_mak
echo "LD_I386_EMULATION=$ld_i386_emulation" >> $config_host_mak
echo "LIBS+=$LIBS" >> $config_host_mak
diff --git a/rules.mak b/rules.mak
index 93a0702..04c7f74 100644
--- a/rules.mak
+++ b/rules.mak
@@ -73,7 +73,7 @@ expand-objs = $(strip $(sort $(filter %.o,$1)) \
# must link with the C++ compiler, not the plain C compiler.
LINKPROG = $(or $(CXX),$(CC))
-LINK = $(call quiet-command, $(LINKPROG) $(QEMU_CFLAGS) $(CFLAGS) $(LDFLAGS)
-o $@ \
+LINK = $(call quiet-command, $(LINKPROG) $(QEMU_LDFLAGS) $(QEMU_CFLAGS)
$(CFLAGS) $(LDFLAGS) -o $@ \
$(call process-archive-undefs, $1) \
$(version-obj-y) $(call extract-libs,$1)
$(LIBS),"LINK","$(TARGET_DIR)$@")
--
1.8.3.1
