configure: verify the availability of twalk_r() for tests

Some C libraries (notably musl) don't have twalk_r() as of yet. Add a
check for it in configure so that we fail sooner rather than at
build-time.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

diff --git a/configure.ac b/configure.ac
index 2ad1fee12935f1f59c0e9ab3ed57fe599a9773f5..2b40a785bac20a7bd928a391303a84d5f7a92715 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -161,6 +161,7 @@ then
        AC_CHECK_FUNC([openat], [], [FUNC_NOT_FOUND_LIB([openat])])
        AC_CHECK_FUNC([mkdirat], [], [FUNC_NOT_FOUND_LIB([mkdirat])])
        AC_CHECK_FUNC([write], [], [FUNC_NOT_FOUND_LIB([write])])
+       AC_CHECK_FUNC([twalk_r], [], [FUNC_NOT_FOUND_LIB([twalk_r])])
        AC_CHECK_HEADERS([sys/utsname.h], [], [HEADER_NOT_FOUND_LIB([sys/utsname.h])])
        AC_CHECK_HEADERS([sys/mount.h], [], [HEADER_NOT_FOUND_LIB([sys/mount.h])])
        AC_CHECK_HEADERS([sys/prctl.h], [], [HEADER_NOT_FOUND_LIB([sys/prctl.h])])