bring back check for std::rand(), and fix use of result

configure

@@ -28204,6 +28204,35 @@ printf "%s\n" "#define IPOPT_HAS_RAND 1" >>confdefs.h
 
 fi
 
+
+
+
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for std::srand" >&5
+printf %s "checking for std::srand... " >&6; }
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <cstdlib>
+      int main ()
+      { (void) std::srand(1) ;
+        return 0 ; }
+
+_ACEOF
+if ac_fn_cxx_try_compile "$LINENO"
+then :
+
+printf "%s\n" "#define IPOPT_HAS_STD__RAND 1" >>confdefs.h
+
+     { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+printf "%s\n" "yes" >&6; }
+else case e in #(
+  e)
+     { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: no" >&5
+printf "%s\n" "no" >&6; } ;;
+esac
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.beam conftest.$ac_ext
+
+
 ##################
 # feenableexcept #
 ##################
@@ -28412,7 +28441,7 @@ else case e in #(
 JAVA_TEST=Test.java
 CLASS_TEST=Test.class
 cat << \EOF > $JAVA_TEST
-/* #line 28415 "configure" */
+/* #line 28444 "configure" */
 public class Test {
 }
 EOF

configure.ac

@@ -328,6 +328,10 @@ AC_CHECK_DECL([drand48],[AC_DEFINE([IPOPT_HAS_DRAND48],[1],
 AC_CHECK_DECL([rand],[AC_DEFINE([IPOPT_HAS_RAND],[1],
                                 [Define to 1 if function rand is available])],,[#include <cstdlib>])
 
+AC_COIN_CHECK_NAMESPACE_DECL([std::srand],[1],
+  [AC_DEFINE([IPOPT_HAS_STD__RAND],[1],[Define to 1 if function std::rand is available])],[],
+  [#include <cstdlib>])
+
 ##################
 # feenableexcept #
 ##################

src/Common/IpUtils.cpp

@@ -113,7 +113,7 @@ Number IpRandom01()
 # ifdef IPOPT_HAS_RAND
    return Number(rand()) / Number(RAND_MAX);
 # else
-#  ifdef HAVE_STD__RAND
+#  ifdef IPOPT_HAS_STD__RAND
    return Number(std::rand()) / Number(RAND_MAX);
 #  else
 #   error "don't have function for random number generator"
@@ -130,7 +130,7 @@ void IpResetRandom01()
 # ifdef IPOPT_HAS_RAND
    srand(1);
 # else
-#  ifdef HAVE_STD__RAND
+#  ifdef IPOPT_HAS_STD__RAND
    std::srand(1);
 #  else
 #   error "don't have function for random number generator"

src/Common/config.h.in

@@ -132,6 +132,9 @@
 /* Define to 1 if the Spral package is available */
 #undef IPOPT_HAS_SPRAL
 
+/* Define to 1 if function std::rand is available */
+#undef IPOPT_HAS_STD__RAND
+
 /* Define to 1 if va_copy is available */
 #undef IPOPT_HAS_VA_COPY