Improve the configure test for presence of ucontext functions by
making linker warnings fatal; this allows us to detect when we are
linked with a glibc which implements makecontext() to always return
ENOSYS.
Signed-off-by: Peter Maydell <peter.mayd...@linaro.org>
---
Compiling on an Ubuntu Natty ARM host will hit this.
(Anybody think we should clean up our configure tests so we can
enable -Werror and -Wl,--fatal-warnings on all of them?)
configure | 7 +++++--
1 files changed, 5 insertions(+), 2 deletions(-)
diff --git a/configure b/configure
index 9b4fe34..4d9d9e0 100755
--- a/configure
+++ b/configure
@@ -2549,9 +2549,12 @@ ucontext_coroutine=no
if test "$darwin" != "yes"; then
cat > $TMPC << EOF
#include <ucontext.h>
-int main(void) { makecontext(0, 0, 0); }
+int main(void) { makecontext(0, 0, 0); return 0; }
EOF
- if compile_prog "" "" ; then
+ # Note that we enable fatal linker warnings to catch the
+ # glibc "makecontext is not implemented and will always fail"
+ # linker warning.
+ if compile_prog "-Wl,--fatal-warnings" "" ; then
ucontext_coroutine=yes
fi
fi
--
1.7.4.1
