Use an autoconf test to detect for a BSD- or GNU-style qsort_r function

[tools/e2fsprogs.git] / configure.ac

diff --git a/configure.ac b/configure.ac
index 78f71fd..4ece83e 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -1226,6 +1226,7 @@ AC_CHECK_FUNCS(m4_flatten([
        pwrite
        pread64
        pwrite64
+       qsort_r
        secure_getenv
        setmntent
        setresgid
@@ -1351,6 +1352,33 @@ then
 fi
 AC_SUBST(SEM_INIT_LIB)
 dnl
+dnl qsort_r detection
+dnl
+AS_IF([test "$ac_cv_func_qsort_r" != no], [
+  AC_CACHE_CHECK(whether qsort_r is GNU version, e2_cv_gnu_qsort_r,
+    [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
+@%:@include <stdlib.h>
+void (qsort_r)(void *base, size_t nmemb, size_t size,
+           int (*compar)(const void *, const void *, void *),
+           void *arg);
+]], [[ ]])],[e2_cv_gnu_qsort_r=yes],[e2_cv_gnu_qsort_r=no])
+  ])
+  AC_CACHE_CHECK(whether qsort_r is BSD version, e2_cv_bsd_qsort_r,
+    [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
+@%:@include <stdlib.h>
+void (qsort_r)(void *base, size_t nmemb, size_t size,
+            void *arg, int (*compar)(void *, const void *, const void *));
+]], [[ ]])],[e2_cv_bsd_qsort_r=yes],[e2_cv_bsd_qsort_r=no])
+  ])
+  AS_CASE("$e2_cv_gnu_qsort_r:$e2_cv_bsd_qsort_r",
+  [yes:no], [
+    AC_DEFINE(HAVE_GNU_QSORT_R, 1, [ Define to 1 if you have the GNU-style 'qsort_r' function.])
+  ],
+  [no:yes], [
+    AC_DEFINE(HAVE_BSD_QSORT_R, 1, [ Define to 1 if you have the BSD-style 'qsort_r' function.])
+  ])
+])
+dnl
 dnl Check for unified diff
 dnl
 AC_MSG_CHECKING(for unified diff option)