From c746a27e91784adf9957600206a5d35dcdad04b1 Mon Sep 17 00:00:00 2001
From: "W. Felix Handte" <w@felixhandte.com>
Date: Mon, 21 May 2018 21:36:49 -0400
Subject: Test Linking C-Compiled Library and C++-Compiled Tests

---
 .travis.yml       |  4 ++++
 Makefile          |  8 ++++++++
 circle.yml        |  1 +
 lib/lz4.c         | 15 +++++++++++++++
 tests/fullbench.c | 18 +++++++++++++++++-
 5 files changed, 45 insertions(+), 1 deletion(-)

diff --git a/.travis.yml b/.travis.yml
index 0a876f9..de6875b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -49,6 +49,10 @@ matrix:
           packages:
             - valgrind
 
+    - env: Ubu=14.04 Cmd='make ctocpptest' COMPILER=cc
+      dist: trusty
+      sudo: false
+
     - env: Ubu=14.04 Cmd='make -C tests test-lz4c32 test-fullbench32 versionsTest' COMPILER=cc
       dist: trusty
       sudo: required
diff --git a/Makefile b/Makefile
index 4afd03f..5776b16 100644
--- a/Makefile
+++ b/Makefile
@@ -172,6 +172,14 @@ gpptest gpptest32: clean
 	CC=$(CC) $(MAKE) -C $(PRGDIR)  all CFLAGS="$(CFLAGS)"
 	CC=$(CC) $(MAKE) -C $(TESTDIR) all CFLAGS="$(CFLAGS)"
 
+ctocpptest: LIBCC="$(CC)"
+ctocpptest: TESTCC="$(CXX)"
+ctocpptest: CFLAGS=""
+ctocpptest: clean
+	CC=$(LIBCC)  $(MAKE) -C $(LZ4DIR)  CFLAGS="$(CFLAGS)" all
+	CC=$(LIBCC)  $(MAKE) -C $(TESTDIR) CFLAGS="$(CFLAGS)" lz4.o lz4hc.o lz4frame.o
+	CC=$(TESTCC) $(MAKE) -C $(TESTDIR) CFLAGS="$(CFLAGS)" all
+
 c_standards: clean
 	CFLAGS="-std=c90   -Werror" $(MAKE) clean allmost
 	CFLAGS="-std=gnu90 -Werror" $(MAKE) clean allmost
diff --git a/circle.yml b/circle.yml
index fa37590..1602e49 100644
--- a/circle.yml
+++ b/circle.yml
@@ -11,6 +11,7 @@ test:
     - clang -v; make clangtest && make clean
     - g++ -v; make gpptest     && make clean
     - gcc -v; make c_standards && make clean
+    - gcc -v; g++ -v; make ctocpptest && make clean
     - gcc-5 -v; CC=gcc-5 CFLAGS="-O2 -Werror" make check && make clean
     - gcc-5 -v; CC=gcc-5 CFLAGS="-O2 -m32 -Werror" CPPFLAGS=-I/usr/include/x86_64-linux-gnu make check && make clean
     - gcc-6 -v; CC=gcc-6 make c_standards && make clean
diff --git a/lib/lz4.c b/lib/lz4.c
index e51a3e0..aaa196d 100644
--- a/lib/lz4.c
+++ b/lib/lz4.c
@@ -496,6 +496,21 @@ int LZ4_compressBound(int isize)  { return LZ4_COMPRESSBOUND(isize); }
 int LZ4_sizeofState() { return LZ4_STREAMSIZE; }
 
 
+/*-************************************
+*  Internal Definitions used in Tests
+**************************************/
+#if defined (__cplusplus)
+extern "C" {
+#endif
+
+int LZ4_compress_forceExtDict (LZ4_stream_t* LZ4_stream, const char* source, char* dest, int inputSize);
+
+int LZ4_decompress_safe_extDict(const char* in, char* out, int inSize, int outSize, const void* dict, size_t dictSize);
+
+#if defined (__cplusplus)
+}
+#endif
+
 /*-******************************
 *  Compression functions
 ********************************/
diff --git a/tests/fullbench.c b/tests/fullbench.c
index c06e230..2818ea2 100644
--- a/tests/fullbench.c
+++ b/tests/fullbench.c
@@ -220,8 +220,16 @@ static int local_LZ4_compress_fast_continue0(const char* in, char* out, int inSi
 }
 
 #ifndef LZ4_DLL_IMPORT
+#if defined (__cplusplus)
+extern "C" {
+#endif
+
 /* declare hidden function */
-int LZ4_compress_forceExtDict (LZ4_stream_t* LZ4_stream, const char* source, char* dest, int inputSize);
+extern int LZ4_compress_forceExtDict (LZ4_stream_t* LZ4_stream, const char* source, char* dest, int inputSize);
+
+#if defined (__cplusplus)
+}
+#endif
 
 static int local_LZ4_compress_forceDict(const char* in, char* out, int inSize)
 {
@@ -289,8 +297,16 @@ static int local_LZ4_decompress_safe_usingDict(const char* in, char* out, int in
 }
 
 #ifndef LZ4_DLL_IMPORT
+#if defined (__cplusplus)
+extern "C" {
+#endif
+
 extern int LZ4_decompress_safe_forceExtDict(const char* in, char* out, int inSize, int outSize, const void* dict, size_t dictSize);
 
+#if defined (__cplusplus)
+}
+#endif
+
 static int local_LZ4_decompress_safe_forceExtDict(const char* in, char* out, int inSize, int outSize)
 {
     (void)inSize;
-- 
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