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authorsanine <sanine.not@pm.me>2022-08-27 23:52:56 -0500
committersanine <sanine.not@pm.me>2022-08-27 23:52:56 -0500
commita4dd0ad63c00f4dee3b86dfd3075d1d61b2b3180 (patch)
tree13bd5bfa15e6fea2a12f176bae79adf9c6fd0933 /3rdparty/plibsys/cmake/StdargDetect.cmake
parentbde3e4f1bb7b8f8abca0884a7d994ee1c17a66b1 (diff)
add plibsys
Diffstat (limited to '3rdparty/plibsys/cmake/StdargDetect.cmake')
-rw-r--r--3rdparty/plibsys/cmake/StdargDetect.cmake74
1 files changed, 74 insertions, 0 deletions
diff --git a/3rdparty/plibsys/cmake/StdargDetect.cmake b/3rdparty/plibsys/cmake/StdargDetect.cmake
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+++ b/3rdparty/plibsys/cmake/StdargDetect.cmake
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+# 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)