diff options
Diffstat (limited to 'libctf/configure.ac')
| -rw-r--r-- | libctf/configure.ac | 44 |
1 files changed, 42 insertions, 2 deletions
diff --git a/libctf/configure.ac b/libctf/configure.ac index 8fd5388..beb90ba 100644 --- a/libctf/configure.ac +++ b/libctf/configure.ac @@ -90,8 +90,48 @@ fi 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_CONFIG_FILES(Makefile) AC_CONFIG_HEADERS(config.h) |