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coroutine: adding configure choose mechanism for coroutine backend

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Configure tries, as a default, ucontext functions for the
coroutines. But now the user can force another backend by
--with-coroutine=BACKEND option

v2: Using --with-coroutine=BACKEND instead of enable
disable individual configure options

Signed-off-by: Alex Barcelo <abarcelo@ac.upc.edu>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Alex Barcelo 2012-02-28 12:25:50 +01:00 committed by Kevin Wolf
parent 3194c8ceeb
commit 519175a2fd
1 changed files with 29 additions and 8 deletions
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37
configure vendored
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@ -194,6 +194,7 @@ opengl=""
zlib="yes"
guest_agent="yes"
libiscsi=""
coroutine=""
# parse CC options first
for opt do
@ -784,6 +785,8 @@ for opt do
;;
--with-pkgversion=*) pkgversion=" ($optarg)"
;;
--with-coroutine=*) coroutine="$optarg"
;;
--disable-docs) docs="no"
;;
--enable-docs) docs="yes"
@ -1110,6 +1113,8 @@ echo " --disable-usb-redir disable usb network redirection support"
echo " --enable-usb-redir enable usb network redirection support"
echo " --disable-guest-agent disable building of the QEMU Guest Agent"
echo " --enable-guest-agent enable building of the QEMU Guest Agent"
echo " --with-coroutine=BACKEND coroutine backend. Supported options:"
echo " gthread, ucontext, windows"
echo ""
echo "NOTE: The object files are built at the place where configure is launched"
exit 1
@ -2715,21 +2720,36 @@ EOF
fi
##########################################
# check if we have makecontext
# (and that it's not a glibc stub which always returns -1)
# check and set a backend for coroutine
ucontext_coroutine=no
if test "$darwin" != "yes"; then
cat > $TMPC << EOF
# default is ucontext, but always fallback to gthread
# windows autodetected by make
if test "$coroutine" = "" -o "$coroutine" = "ucontext"; then
if test "$darwin" != "yes"; then
cat > $TMPC << EOF
#include <ucontext.h>
#ifdef __stub_makecontext
#error Ignoring glibc stub makecontext which will always fail
#endif
int main(void) { makecontext(0, 0, 0); return 0; }
EOF
if compile_prog "" "" ; then
ucontext_coroutine=yes
if compile_prog "" "" ; then
coroutine_backend=ucontext
else
coroutine_backend=gthread
fi
else
echo "Silently falling back into gthread backend under darwin"
fi
elif test "$coroutine" = "gthread" ; then
coroutine_backend=gthread
elif test "$coroutine" = "windows" ; then
coroutine_backend=windows
else
echo
echo "Error: unknown coroutine backend $coroutine"
echo
exit 1
fi
##########################################
@ -2931,6 +2951,7 @@ echo "usb net redir $usb_redir"
echo "OpenGL support $opengl"
echo "libiscsi support $libiscsi"
echo "build guest agent $guest_agent"
echo "coroutine backend $coroutine_backend"
if test "$sdl_too_old" = "yes"; then
echo "-> Your SDL version is too old - please upgrade to have SDL support"
@ -3246,7 +3267,7 @@ if test "$rbd" = "yes" ; then
echo "CONFIG_RBD=y" >> $config_host_mak
fi
if test "$ucontext_coroutine" = "yes" ; then
if test "$coroutine_backend" = "ucontext" ; then
echo "CONFIG_UCONTEXT_COROUTINE=y" >> $config_host_mak
fi