From fdc9cfaa148840c0c76d3837e359eeca5b33e3ad Mon Sep 17 00:00:00 2001
From: Luca Niccoli <lultimouomo@gmail.com>
Date: Sun, 30 Apr 2023 13:02:31 +0200
Subject: cmake: Fix va_copy detection

va_copy is defined by the standard as a macro, so check_function_exists
will not detect it; check_symbol_exists will.

Fixes #528.
---
 CMakeLists.txt | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 86b2b0aa..834b35d3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -169,8 +169,8 @@ if (NOT MSVC)
 	check_include_files(sys/timeb.h HAVE_SYS_TIMEB_H)
 	check_include_files(sys/time.h HAVE_SYS_TIME_H)
 	check_include_files(unistd.h HAVE_UNISTD_H)
-	check_function_exists(va_copy HAVE_VA_COPY)
-	check_function_exists(__va_copy HAVE___VA_COPY)
+	check_symbol_exists(va_copy stdarg.h HAVE_VA_COPY)
+	check_symbol_exists(__va_copy stdarg.h HAVE___VA_COPY)
 	set(LT_OBJDIR ".libs/")
 	check_c_source_compiles("
 		#include <stdarg.h>
-- 
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