1 files changed, 74 insertions, 0 deletions
diff --git a/3rdparty/plibsys/cmake/StdargDetect.cmake b/3rdparty/plibsys/cmake/StdargDetect.cmake
new file mode 100644
index 0000000..a85f59a
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+++ b/3rdparty/plibsys/cmake/StdargDetect.cmake
@@ -0,0 +1,74 @@
+# The MIT License
+#
+# Copyright (C) 2017 Jean-Damien Durand <jeandamiendurand@gmail.com>
+# Copyright (C) 2019 Alexander Saprykin <saprykin.spb@gmail.com>
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# 'Software'), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+# CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+function (plibsys_detect_va_copy result)
+    #
+    # On platforms that supports va_start() and al.
+    # there is sometimes the need to do va_copy() when
+    # calling another va_list aware function.
+    #
+    # This means that va_copy() is not needed (thus not available)
+    # everywhere.
+    #
+    # We depend on stdarg.h in any case, stdio.h in some cases.
+    #
+    # Known implementations vary from va_copy to __va_copy (old proposed name).
+    # We check the _va_copy eventually.
+    #
+    set (P_VA_COPY FALSE)
+    foreach (KEYWORD "va_copy" "_va_copy" "__va_copy")
+        check_c_source_compiles ("
+                     #include <stdio.h>
+                     #include <stdlib.h>
+                     #include <stdarg.h>
+
+                     void f (int i, ...) {
+                        va_list args1, args2;
+
+                        va_start (args1, i);
+                        ${KEYWORD}(args2, args1);
+                        if (va_arg (args2, int) != 42 || va_arg (args1, int) != 42) {
+                            exit (1);
+                        }
+                        va_end (args1);
+                        va_end (args2);
+                     }
+
+                     int main () {
+                        f (0, 42);
+                        exit (0);
+                     }"
+                    PLIBSYS_${KEYWORD}
+        )
+
+        if (PLIBSYS_${KEYWORD})
+            set (P_VA_COPY ${KEYWORD})
+            break()
+        endif()
+    endforeach()
+
+    # Assign result
+    set (${result} ${P_VA_COPY} PARENT_SCOPE)
+
+endfunction (plibsys_detect_va_copy)