Find x87 and x86-32 SSE to adjust compile settings (fixes #4324)

cmake/modules/FindX87Math.cmake

@@ -0,0 +1,60 @@
+# This file is part of RawTherapee.
+#
+# Copyright (C) 2018 Flössie <floessie.mail@gmail.com>
+#
+# RawTherapee 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.
+#
+# RawTherapee 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 RawTherapee.  If not, see <http://www.gnu.org/licenses/>.
+
+include(CheckCXXSourceCompiles)
+
+set(CMAKE_REQUIRED_QUIET_COPY "${CMAKE_REQUIRED_QUIET}")
+set(CMAKE_REQUIRED_QUIET ON)
+
+set(TEST_SOURCE
+"
+#if !defined(__i386) && !defined(_M_IX86)
+#error
+#endif
+
+#if defined(__SSE2__)
+#error
+#endif
+
+int main()
+{
+}
+")
+
+CHECK_CXX_SOURCE_COMPILES("${TEST_SOURCE}" HAVE_X87_MATH)
+
+set(TEST_SOURCE
+"
+#if !defined(__i386) && !defined(_M_IX86)
+#error
+#endif
+
+#if !defined(__SSE2__)
+#error
+#endif
+
+int main()
+{
+}
+")
+
+CHECK_CXX_SOURCE_COMPILES("${TEST_SOURCE}" HAVE_X86_SSE_MATH)
+
+unset(TEST_SOURCE)
+
+set(CMAKE_REQUIRED_QUIET "${CMAKE_REQUIRED_QUIET_COPY}")
+unset(CMAKE_REQUIRED_QUIET_COPY)