From 6952b81fe89a136c0d087aa98cfbfd8bfc965818 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Fr=C3=A9d=C3=A9ric=20Bri=C3=A8re?= <fbriere@fbriere.net>
Date: Tue, 13 Feb 2018 10:29:31 -0500
Subject: CMake: Check if libilbc links without 'extern "C"' (ILBC_CPP)

This variable was originally set manually in configure.in.
---
 cmake/FindIlbc.cmake | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

(limited to 'cmake')

diff --git a/cmake/FindIlbc.cmake b/cmake/FindIlbc.cmake
index f66ca55..7bbffa9 100644
--- a/cmake/FindIlbc.cmake
+++ b/cmake/FindIlbc.cmake
@@ -1,8 +1,27 @@
+include (CMakePushCheckState)
+include (CheckCXXSourceCompiles)
+
 FIND_PATH(ILBC_INCLUDE_DIR ilbc/iLBC_decode.h)
 FIND_LIBRARY(ILBC_LIBRARIES NAMES ilbc)
 
 IF(ILBC_INCLUDE_DIR AND ILBC_LIBRARIES)
 	SET(ILBC_FOUND TRUE)
+
+	# Check if libilbc can be used without 'extern "C"'
+	CMAKE_PUSH_CHECK_STATE()
+	LIST(APPEND CMAKE_REQUIRED_INCLUDES "${ILBC_INCLUDE_DIR}")
+	LIST(APPEND CMAKE_REQUIRED_LIBRARIES "-lilbc")
+	SET(CMAKE_REQUIRED_QUIET TRUE)
+	CHECK_CXX_SOURCE_COMPILES("
+		#include <ilbc/iLBC_decode.h>
+
+		int main() {
+			iLBC_Dec_Inst_t *iLBCdec_inst;
+			initDecode(iLBCdec_inst, 0, 0);
+			return 0;
+		}
+	" ILBC_CPP)
+	CMAKE_POP_CHECK_STATE()
 ENDIF(ILBC_INCLUDE_DIR AND ILBC_LIBRARIES)
 
 IF(ILBC_FOUND)
-- 
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