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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)
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