fenv: Add C++ tests

[Bruno Haible]

This patch completes the 'fenv' tests, by adding a C++ test module, with the
usual idioms (like for the other header files).


2023-11-05  Bruno Haible  <br...@clisp.org>

        fenv: Add C++ tests.
        * tests/test-fenv-c++.cc: New file.
        * modules/fenv-c++-tests: New file.
        * modules/fenv-tests (Depends-on): Add it.

diff --git a/modules/fenv-c++-tests b/modules/fenv-c++-tests
new file mode 100644
index 0000000000..a485726088
--- /dev/null
+++ b/modules/fenv-c++-tests
@@ -0,0 +1,19 @@
+Files:
+tests/test-fenv-c++.cc
+tests/signature.h
+
+Status:
+c++-test
+
+Depends-on:
+ansi-c++-opt
+
+configure.ac:
+
+Makefile.am:
+if ANSICXX
+TESTS += test-fenv-c++
+check_PROGRAMS += test-fenv-c++
+test_fenv_c___SOURCES = test-fenv-c++.cc
+test_fenv_c___LDADD = $(LDADD) $(FENV_ENVIRONMENT_LIBM) $(FENV_ROUNDING_LIBM) 
$(FENV_EXCEPTIONS_TRACKING_LIBM) $(FENV_EXCEPTIONS_TRAPPING_LIBM)
+endif
diff --git a/modules/fenv-tests b/modules/fenv-tests
index ec9048e202..c7f96c040a 100644
--- a/modules/fenv-tests
+++ b/modules/fenv-tests
@@ -3,6 +3,7 @@ tests/test-fenv.c
 
 Depends-on:
 verify
+fenv-c++-tests
 
 configure.ac:
 
diff --git a/tests/test-fenv-c++.cc b/tests/test-fenv-c++.cc
new file mode 100644
index 0000000000..aa4f05d0ce
--- /dev/null
+++ b/tests/test-fenv-c++.cc
@@ -0,0 +1,95 @@
+/* Test of <fenv.h> substitute in C++ mode.
+   Copyright (C) 2023 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+/* Written by Bruno Haible <br...@clisp.org>, 2010.  */
+
+#define GNULIB_NAMESPACE gnulib
+#include <config.h>
+
+#include <fenv.h>
+
+#include "signature.h"
+
+
+#if GNULIB_TEST_FEGETENV
+SIGNATURE_CHECK (GNULIB_NAMESPACE::fegetenv, int, (fenv_t *));
+#endif
+
+#if GNULIB_TEST_FESETENV
+SIGNATURE_CHECK (GNULIB_NAMESPACE::fesetenv, int, (fenv_t const *));
+#endif
+
+#if GNULIB_TEST_FEUPDATEENV
+SIGNATURE_CHECK (GNULIB_NAMESPACE::feupdateenv, int, (fenv_t const *));
+#endif
+
+#if GNULIB_TEST_FEHOLDEXCEPT
+SIGNATURE_CHECK (GNULIB_NAMESPACE::feholdexcept, int, (fenv_t *));
+#endif
+
+#if GNULIB_TEST_FEGETROUND
+SIGNATURE_CHECK (GNULIB_NAMESPACE::fegetround, int, (void));
+#endif
+
+#if GNULIB_TEST_FESETROUND
+SIGNATURE_CHECK (GNULIB_NAMESPACE::fesetround, int, (int));
+#endif
+
+#if GNULIB_TEST_FECLEAREXCEPT
+SIGNATURE_CHECK (GNULIB_NAMESPACE::feclearexcept, int, (int));
+#endif
+
+#if GNULIB_TEST_FERAISEEXCEPT
+SIGNATURE_CHECK (GNULIB_NAMESPACE::feraiseexcept, int, (int));
+#endif
+
+#if GNULIB_TEST_FETESTEXCEPT
+SIGNATURE_CHECK (GNULIB_NAMESPACE::fetestexcept, int, (int));
+#endif
+
+#if GNULIB_TEST_FESETEXCEPT
+SIGNATURE_CHECK (GNULIB_NAMESPACE::fesetexcept, int, (int));
+#endif
+
+#if GNULIB_TEST_FEENABLEEXCEPT
+SIGNATURE_CHECK (GNULIB_NAMESPACE::feenableexcept, int, (int));
+#endif
+
+#if GNULIB_TEST_FEDISABLEEXCEPT
+SIGNATURE_CHECK (GNULIB_NAMESPACE::fedisableexcept, int, (int));
+#endif
+
+#if GNULIB_TEST_FEGETEXCEPT
+SIGNATURE_CHECK (GNULIB_NAMESPACE::fegetexcept, int, (void));
+#endif
+
+#if GNULIB_TEST_FEGETEXCEPTFLAG
+SIGNATURE_CHECK (GNULIB_NAMESPACE::fegetexceptflag, int, (fexcept_t *, int));
+#endif
+
+#if GNULIB_TEST_FESETEXCEPTFLAG
+SIGNATURE_CHECK (GNULIB_NAMESPACE::fesetexceptflag, int, (fexcept_t const *, 
int));
+#endif
+
+#if GNULIB_TEST_FETESTEXCEPTFLAG
+SIGNATURE_CHECK (GNULIB_NAMESPACE::fetestexceptflag, int, (fexcept_t const *, 
int));
+#endif
+
+
+int
+main ()
+{
+}