2 files changed, 16 insertions, 0 deletions

diff --git a/lib/gnulib.mk b/lib/gnulib.mk
index a691a0b3233..56c210961a7 100644
--- a/lib/gnulib.mk
+++ b/lib/gnulib.mk
@@ -1258,6 +1258,7 @@ stdlib.h: stdlib.in.h $(top_builddir)/config.status $(CXXDEFS_H) \
               -e 's|@''HAVE_POSIX_OPENPT''@|$(HAVE_POSIX_OPENPT)|g' \
               -e 's|@''HAVE_PTSNAME''@|$(HAVE_PTSNAME)|g' \
               -e 's|@''HAVE_PTSNAME_R''@|$(HAVE_PTSNAME_R)|g' \
+              -e 's|@''HAVE_QSORT_R''@|$(HAVE_QSORT_R)|g' \
               -e 's|@''HAVE_RANDOM''@|$(HAVE_RANDOM)|g' \
               -e 's|@''HAVE_RANDOM_H''@|$(HAVE_RANDOM_H)|g' \
               -e 's|@''HAVE_RANDOM_R''@|$(HAVE_RANDOM_R)|g' \
diff --git a/lib/stdlib.in.h b/lib/stdlib.in.h
index 70dc88db753..db3253bd970 100644
--- a/lib/stdlib.in.h
+++ b/lib/stdlib.in.h
@@ -521,6 +521,9 @@ _GL_CXXALIASWARN (putenv);
 #endif
 
 #if @GNULIB_QSORT_R@
+/* Sort an array of NMEMB elements, starting at address BASE, each element
+   occupying SIZE bytes, in ascending order according to the comparison
+   function COMPARE.  */
 # if @REPLACE_QSORT_R@
 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 #   undef qsort_r
@@ -535,12 +538,24 @@ _GL_CXXALIAS_RPL (qsort_r, void, (void *base, size_t nmemb, size_t size,
                                                   void *),
                                   void *arg));
 # else
+#  if !@HAVE_QSORT_R@
+_GL_FUNCDECL_SYS (qsort_r, void, (void *base, size_t nmemb, size_t size,
+                                  int (*compare) (void const *, void const *,
+                                                  void *),
+                                  void *arg) _GL_ARG_NONNULL ((1, 4)));
+#  endif
 _GL_CXXALIAS_SYS (qsort_r, void, (void *base, size_t nmemb, size_t size,
                                   int (*compare) (void const *, void const *,
                                                   void *),
                                   void *arg));
 # endif
 _GL_CXXALIASWARN (qsort_r);
+#elif defined GNULIB_POSIXCHECK
+# undef qsort_r
+# if HAVE_RAW_DECL_QSORT_R
+_GL_WARN_ON_USE (qsort_r, "qsort_r is not portable - "
+                 "use gnulib module qsort_r for portability");
+# endif
 #endif