AC_C_BIGENDIAN
AC_CHECK_HEADERS(byteswap.h endian.h)
AC_CHECK_FUNCS(pread)
-AC_CHECK_DECLS([qsort_r])
-AC_LIBOBJ([qsort_r])
+
+dnl Check for qsort_r. (Taken from gnulib.)
+AC_CHECK_FUNCS_ONCE([qsort_r])
+if test $ac_cv_func_qsort_r = yes; then
+ AC_CACHE_CHECK([for qsort_r signature], [ac_cv_libctf_qsort_r_signature],
+ [AC_LINK_IFELSE(
+ [AC_LANG_PROGRAM([[#undef qsort_r
+ #include <stdlib.h>
+ void qsort_r (void *, size_t, size_t,
+ int (*) (void const *, void const *,
+ void *),
+ void *);
+ void (*p) (void *, size_t, size_t,
+ int (*) (void const *, void const *,
+ void *),
+ void *) = qsort_r;
+ ]])],
+ [ac_cv_libctf_qsort_r_signature=GNU],
+ [AC_LINK_IFELSE(
+ [AC_LANG_PROGRAM([[#undef qsort_r
+ #include <stdlib.h>
+ void qsort_r (void *, size_t, size_t, void *,
+ int (*) (void *,
+ void const *,
+ void const *));
+ void (*p) (void *, size_t, size_t, void *,
+ int (*) (void *, void const *,
+ void const *)) = qsort_r;
+ ]])],
+ [ac_cv_libctf_qsort_r_signature=BSD],
+ [ac_cv_libctf_qsort_r_signature=unknown])])])
+fi
+
+case x$ac_cv_libctf_qsort_r_signature in
+ xGNU) AC_DEFINE([HAVE_QSORT_R_ARG_LAST], 1,
+ [Whether a qsort_r exists with a void *arg as its last arg.]);;
+ xBSD) AC_DEFINE([HAVE_QSORT_R_COMPAR_LAST], 1,
+ [Whether a qsort_r exists with the compar function as its last arg.]);;
+ *) ac_cv_libctf_qsort_r_signature=unknown;;
+esac
+
+AM_CONDITIONAL(NEED_CTF_QSORT_R, test "${ac_cv_libctf_qsort_r_signature}" = unknown)
+
+AC_CACHE_CHECK([for O_CLOEXEC], [ac_cv_libctf_macro_O_CLOEXEC],
+ [AC_LINK_IFELSE(
+ [AC_LANG_PROGRAM([[#include <fcntl.h>
+ #ifndef O_CLOEXEC
+ choke me;
+ #endif
+ ]],
+ [[return O_CLOEXEC;]])],
+ [ac_cv_libctf_macro_O_CLOEXEC=yes],
+ [ac_cv_libctf_macro_O_CLOEXEC=no])])
+
+if test $ac_cv_libctf_macro_O_CLOEXEC = yes; then
+ AC_DEFINE([HAVE_O_CLOEXEC], 1,
+ [Whether the platform has a definition of O_CLOEXEC.])
+fi
AC_CONFIG_FILES(Makefile)
AC_CONFIG_HEADERS(config.h)