| Message ID | 1493145313-31311-9-git-send-email-sstabellini@kernel.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Tue, 25 Apr 2017 at 19:35, Stefano Stabellini <sstabellini@kernel.org> wrote: > > From: Juergen Gross <jgross@suse.com> > > Instead of trying to guess the Xen version to use by compiling various > test programs first just ask the system via pkg-config. Only if it > can't return the version fall back to the test program scheme. > > If configure is being called with dedicated flags for the Xen libraries > use those instead of the pkg-config output. This will avoid breaking > an in-tree Xen build of an old Xen version while a new Xen version is > installed on the build machine: pkg-config would pick up the installed > Xen config files as the Xen tree wouldn't contain any of them. > > Signed-off-by: Juergen Gross <jgross@suse.com> > Signed-off-by: Stefano Stabellini <sstabellini@kernel.org> > Tested-by: Paul Durrant <paul.durrant@citrix.com> > Reviewed-by: Stefano Stabellini <sstabellini@kernel.org> > --- > configure | 159 ++++++++++++++++++++++++++++++++++---------------------------- > 1 file changed, 88 insertions(+), 71 deletions(-) > > diff --git a/configure b/configure > index 271bea8..3133ef8 100755 > --- a/configure > +++ b/configure > @@ -1975,30 +1975,46 @@ fi > # xen probe > > if test "$xen" != "no" ; then > - xen_libs="-lxenstore -lxenctrl -lxenguest" > - xen_stable_libs="-lxencall -lxenforeignmemory -lxengnttab -lxenevtchn" > + # Check whether Xen library path is specified via --extra-ldflags to avoid > + # overriding this setting with pkg-config output. If not, try pkg-config > + # to obtain all needed flags. > + > + if ! echo $EXTRA_LDFLAGS | grep tools/libxc > /dev/null && \ > + $pkg_config --exists xencontrol ; then > + xen_ctrl_version="$(printf '%d%02d%02d' \ > + $($pkg_config --modversion xencontrol | sed 's/\./ /g') )" > + xen=yes > + xen_pc="xencontrol xenstore xenguest xenforeignmemory xengnttab" > + xen_pc="$xen_pc xenevtchn xendevicemodel" > + QEMU_CFLAGS="$QEMU_CFLAGS $($pkg_config --cflags $xen_pc)" > + libs_softmmu="$($pkg_config --libs $xen_pc) $libs_softmmu" > + LDFLAGS="$($pkg_config --libs $xen_pc) $LDFLAGS" > + else Hi -- this is an old patch, but MJT has just noticed that it means that (assuming configure takes the "we have a pkg-config for Xen" path) the Xen libraries get added to both libs_softmmu and LDFLAGS, which means that everything, including the linux-user binaries, gets linked against them. The old fallback path only adds them to libs_softmmu. Juergen: is there a reason why you added the libs to both libs_softmmu and LDFLAGS here? Can we just delete the line that alters LDFLAGS? thanks -- PMM
On Tue, Dec 11, 2018 at 10:34:52AM +0000, Peter Maydell wrote: > On Tue, 25 Apr 2017 at 19:35, Stefano Stabellini <sstabellini@kernel.org> wrote: > > > > From: Juergen Gross <jgross@suse.com> > > > > Instead of trying to guess the Xen version to use by compiling various > > test programs first just ask the system via pkg-config. Only if it > > can't return the version fall back to the test program scheme. > > > > If configure is being called with dedicated flags for the Xen libraries > > use those instead of the pkg-config output. This will avoid breaking > > an in-tree Xen build of an old Xen version while a new Xen version is > > installed on the build machine: pkg-config would pick up the installed > > Xen config files as the Xen tree wouldn't contain any of them. > > > > Signed-off-by: Juergen Gross <jgross@suse.com> > > Signed-off-by: Stefano Stabellini <sstabellini@kernel.org> > > Tested-by: Paul Durrant <paul.durrant@citrix.com> > > Reviewed-by: Stefano Stabellini <sstabellini@kernel.org> > > --- > > configure | 159 ++++++++++++++++++++++++++++++++++---------------------------- > > 1 file changed, 88 insertions(+), 71 deletions(-) > > > > diff --git a/configure b/configure > > index 271bea8..3133ef8 100755 > > --- a/configure > > +++ b/configure > > @@ -1975,30 +1975,46 @@ fi > > # xen probe > > > > if test "$xen" != "no" ; then > > - xen_libs="-lxenstore -lxenctrl -lxenguest" > > - xen_stable_libs="-lxencall -lxenforeignmemory -lxengnttab -lxenevtchn" > > + # Check whether Xen library path is specified via --extra-ldflags to avoid > > + # overriding this setting with pkg-config output. If not, try pkg-config > > + # to obtain all needed flags. > > + > > + if ! echo $EXTRA_LDFLAGS | grep tools/libxc > /dev/null && \ > > + $pkg_config --exists xencontrol ; then > > + xen_ctrl_version="$(printf '%d%02d%02d' \ > > + $($pkg_config --modversion xencontrol | sed 's/\./ /g') )" > > + xen=yes > > + xen_pc="xencontrol xenstore xenguest xenforeignmemory xengnttab" > > + xen_pc="$xen_pc xenevtchn xendevicemodel" > > + QEMU_CFLAGS="$QEMU_CFLAGS $($pkg_config --cflags $xen_pc)" > > + libs_softmmu="$($pkg_config --libs $xen_pc) $libs_softmmu" > > + LDFLAGS="$($pkg_config --libs $xen_pc) $LDFLAGS" > > + else > > Hi -- this is an old patch, but MJT has just noticed that > it means that (assuming configure takes the "we have a pkg-config > for Xen" path) the Xen libraries get added to both libs_softmmu > and LDFLAGS, which means that everything, including the linux-user > binaries, gets linked against them. The old fallback path > only adds them to libs_softmmu. > > Juergen: is there a reason why you added the libs to both > libs_softmmu and LDFLAGS here? Can we just delete the line > that alters LDFLAGS? In the 'else' block that takes the non-pkg-config path, the libs are only added to "libs_softmmu". So I think removing LDFLAGS is right. Regards, Daniel
On Tue, 11 Dec 2018, Daniel wrote: > On Tue, Dec 11, 2018 at 10:34:52AM +0000, Peter Maydell wrote: > > On Tue, 25 Apr 2017 at 19:35, Stefano Stabellini <sstabellini@kernel.org> wrote: > > > > > > From: Juergen Gross <jgross@suse.com> > > > > > > Instead of trying to guess the Xen version to use by compiling various > > > test programs first just ask the system via pkg-config. Only if it > > > can't return the version fall back to the test program scheme. > > > > > > If configure is being called with dedicated flags for the Xen libraries > > > use those instead of the pkg-config output. This will avoid breaking > > > an in-tree Xen build of an old Xen version while a new Xen version is > > > installed on the build machine: pkg-config would pick up the installed > > > Xen config files as the Xen tree wouldn't contain any of them. > > > > > > Signed-off-by: Juergen Gross <jgross@suse.com> > > > Signed-off-by: Stefano Stabellini <sstabellini@kernel.org> > > > Tested-by: Paul Durrant <paul.durrant@citrix.com> > > > Reviewed-by: Stefano Stabellini <sstabellini@kernel.org> > > > --- > > > configure | 159 ++++++++++++++++++++++++++++++++++---------------------------- > > > 1 file changed, 88 insertions(+), 71 deletions(-) > > > > > > diff --git a/configure b/configure > > > index 271bea8..3133ef8 100755 > > > --- a/configure > > > +++ b/configure > > > @@ -1975,30 +1975,46 @@ fi > > > # xen probe > > > > > > if test "$xen" != "no" ; then > > > - xen_libs="-lxenstore -lxenctrl -lxenguest" > > > - xen_stable_libs="-lxencall -lxenforeignmemory -lxengnttab -lxenevtchn" > > > + # Check whether Xen library path is specified via --extra-ldflags to avoid > > > + # overriding this setting with pkg-config output. If not, try pkg-config > > > + # to obtain all needed flags. > > > + > > > + if ! echo $EXTRA_LDFLAGS | grep tools/libxc > /dev/null && \ > > > + $pkg_config --exists xencontrol ; then > > > + xen_ctrl_version="$(printf '%d%02d%02d' \ > > > + $($pkg_config --modversion xencontrol | sed 's/\./ /g') )" > > > + xen=yes > > > + xen_pc="xencontrol xenstore xenguest xenforeignmemory xengnttab" > > > + xen_pc="$xen_pc xenevtchn xendevicemodel" > > > + QEMU_CFLAGS="$QEMU_CFLAGS $($pkg_config --cflags $xen_pc)" > > > + libs_softmmu="$($pkg_config --libs $xen_pc) $libs_softmmu" > > > + LDFLAGS="$($pkg_config --libs $xen_pc) $LDFLAGS" > > > + else > > > > Hi -- this is an old patch, but MJT has just noticed that > > it means that (assuming configure takes the "we have a pkg-config > > for Xen" path) the Xen libraries get added to both libs_softmmu > > and LDFLAGS, which means that everything, including the linux-user > > binaries, gets linked against them. The old fallback path > > only adds them to libs_softmmu. > > > > Juergen: is there a reason why you added the libs to both > > libs_softmmu and LDFLAGS here? Can we just delete the line > > that alters LDFLAGS? > > In the 'else' block that takes the non-pkg-config path, the libs are > only added to "libs_softmmu". So I think removing LDFLAGS is right. Yes, I think you are correct.
diff --git a/configure b/configure index 271bea8..3133ef8 100755 --- a/configure +++ b/configure @@ -1975,30 +1975,46 @@ fi # xen probe if test "$xen" != "no" ; then - xen_libs="-lxenstore -lxenctrl -lxenguest" - xen_stable_libs="-lxencall -lxenforeignmemory -lxengnttab -lxenevtchn" + # Check whether Xen library path is specified via --extra-ldflags to avoid + # overriding this setting with pkg-config output. If not, try pkg-config + # to obtain all needed flags. + + if ! echo $EXTRA_LDFLAGS | grep tools/libxc > /dev/null && \ + $pkg_config --exists xencontrol ; then + xen_ctrl_version="$(printf '%d%02d%02d' \ + $($pkg_config --modversion xencontrol | sed 's/\./ /g') )" + xen=yes + xen_pc="xencontrol xenstore xenguest xenforeignmemory xengnttab" + xen_pc="$xen_pc xenevtchn xendevicemodel" + QEMU_CFLAGS="$QEMU_CFLAGS $($pkg_config --cflags $xen_pc)" + libs_softmmu="$($pkg_config --libs $xen_pc) $libs_softmmu" + LDFLAGS="$($pkg_config --libs $xen_pc) $LDFLAGS" + else - # First we test whether Xen headers and libraries are available. - # If no, we are done and there is no Xen support. - # If yes, more tests are run to detect the Xen version. + xen_libs="-lxenstore -lxenctrl -lxenguest" + xen_stable_libs="-lxencall -lxenforeignmemory -lxengnttab -lxenevtchn" - # Xen (any) - cat > $TMPC <<EOF + # First we test whether Xen headers and libraries are available. + # If no, we are done and there is no Xen support. + # If yes, more tests are run to detect the Xen version. + + # Xen (any) + cat > $TMPC <<EOF #include <xenctrl.h> int main(void) { return 0; } EOF - if ! compile_prog "" "$xen_libs" ; then - # Xen not found - if test "$xen" = "yes" ; then - feature_not_found "xen" "Install xen devel" - fi - xen=no + if ! compile_prog "" "$xen_libs" ; then + # Xen not found + if test "$xen" = "yes" ; then + feature_not_found "xen" "Install xen devel" + fi + xen=no - # Xen unstable - elif - cat > $TMPC <<EOF && + # Xen unstable + elif + cat > $TMPC <<EOF && #undef XC_WANT_COMPAT_DEVICEMODEL_API #define __XEN_TOOLS__ #include <xendevicemodel.h> @@ -2011,13 +2027,13 @@ int main(void) { return 0; } EOF - compile_prog "" "$xen_libs -lxendevicemodel $xen_stable_libs" - then - xen_stable_libs="-lxendevicemodel $xen_stable_libs" - xen_ctrl_version=40900 - xen=yes - elif - cat > $TMPC <<EOF && + compile_prog "" "$xen_libs -lxendevicemodel $xen_stable_libs" + then + xen_stable_libs="-lxendevicemodel $xen_stable_libs" + xen_ctrl_version=40900 + xen=yes + elif + cat > $TMPC <<EOF && /* * If we have stable libs the we don't want the libxc compat * layers, regardless of what CFLAGS we may have been given. @@ -2067,12 +2083,12 @@ int main(void) { return 0; } EOF - compile_prog "" "$xen_libs $xen_stable_libs" - then - xen_ctrl_version=40800 - xen=yes - elif - cat > $TMPC <<EOF && + compile_prog "" "$xen_libs $xen_stable_libs" + then + xen_ctrl_version=40800 + xen=yes + elif + cat > $TMPC <<EOF && /* * If we have stable libs the we don't want the libxc compat * layers, regardless of what CFLAGS we may have been given. @@ -2118,12 +2134,12 @@ int main(void) { return 0; } EOF - compile_prog "" "$xen_libs $xen_stable_libs" - then - xen_ctrl_version=40701 - xen=yes - elif - cat > $TMPC <<EOF && + compile_prog "" "$xen_libs $xen_stable_libs" + then + xen_ctrl_version=40701 + xen=yes + elif + cat > $TMPC <<EOF && #include <xenctrl.h> #include <stdint.h> int main(void) { @@ -2133,14 +2149,14 @@ int main(void) { return 0; } EOF - compile_prog "" "$xen_libs" - then - xen_ctrl_version=40700 - xen=yes - - # Xen 4.6 - elif - cat > $TMPC <<EOF && + compile_prog "" "$xen_libs" + then + xen_ctrl_version=40700 + xen=yes + + # Xen 4.6 + elif + cat > $TMPC <<EOF && #include <xenctrl.h> #include <xenstore.h> #include <stdint.h> @@ -2161,14 +2177,14 @@ int main(void) { return 0; } EOF - compile_prog "" "$xen_libs" - then - xen_ctrl_version=40600 - xen=yes - - # Xen 4.5 - elif - cat > $TMPC <<EOF && + compile_prog "" "$xen_libs" + then + xen_ctrl_version=40600 + xen=yes + + # Xen 4.5 + elif + cat > $TMPC <<EOF && #include <xenctrl.h> #include <xenstore.h> #include <stdint.h> @@ -2188,13 +2204,13 @@ int main(void) { return 0; } EOF - compile_prog "" "$xen_libs" - then - xen_ctrl_version=40500 - xen=yes + compile_prog "" "$xen_libs" + then + xen_ctrl_version=40500 + xen=yes - elif - cat > $TMPC <<EOF && + elif + cat > $TMPC <<EOF && #include <xenctrl.h> #include <xenstore.h> #include <stdint.h> @@ -2213,24 +2229,25 @@ int main(void) { return 0; } EOF - compile_prog "" "$xen_libs" - then - xen_ctrl_version=40200 - xen=yes + compile_prog "" "$xen_libs" + then + xen_ctrl_version=40200 + xen=yes - else - if test "$xen" = "yes" ; then - feature_not_found "xen (unsupported version)" \ - "Install a supported xen (xen 4.2 or newer)" + else + if test "$xen" = "yes" ; then + feature_not_found "xen (unsupported version)" \ + "Install a supported xen (xen 4.2 or newer)" + fi + xen=no fi - xen=no - fi - if test "$xen" = yes; then - if test $xen_ctrl_version -ge 40701 ; then - libs_softmmu="$xen_stable_libs $libs_softmmu" + if test "$xen" = yes; then + if test $xen_ctrl_version -ge 40701 ; then + libs_softmmu="$xen_stable_libs $libs_softmmu" + fi + libs_softmmu="$xen_libs $libs_softmmu" fi - libs_softmmu="$xen_libs $libs_softmmu" fi fi