[mathic] 60/62: Added a C function to library for easier detection from autoconf.

[Doug Torrance]

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dtorrance-guest pushed a commit to branch master
in repository mathic.

commit 60b3ec56afa03aa879c1cbb150a125f3362005d2
Author: Bjarke Hammersholt Roune <bjarkehr.code at gmail.com>
Date:   Fri Aug 9 17:00:48 2013 +0200

    Added a C function to library for easier detection from autoconf.
---
 Makefile.am    | 2 +-
 src/mathic.cpp | 5 +++++
 src/mathic.h   | 7 +++++++
 3 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/Makefile.am b/Makefile.am
index 1547a41..08b94d1 100755
--- a/Makefile.am
+++ b/Makefile.am
@@ -22,7 +22,7 @@ libmathic_la_SOURCES = src/mathic/Timer.cpp	\
   src/mathic/CliParameter.cpp src/mathic/CliParser.cpp				\
   src/mathic/error.cpp src/mathic/HelpAction.cpp					\
   src/mathic/IntegerParameter.cpp src/mathic/StringParameter.cpp	\
-  src/mathic/display.cpp src/mathic/BitTriangle.cpp
+  src/mathic/display.cpp src/mathic/BitTriangle.cpp src/mathic.cpp
 
 # The headers that libmathic installs.
 # Normally, automake strips the path from the files when installing them,
diff --git a/src/mathic.cpp b/src/mathic.cpp
new file mode 100755
index 0000000..2b0f03d
--- /dev/null
+++ b/src/mathic.cpp
@@ -0,0 +1,5 @@
+#include "mathic.h"
+
+extern "C" {
+  void libmathicIsPresent(void) {}
+}
diff --git a/src/mathic.h b/src/mathic.h
index 2e92538..5c70f5b 100755
--- a/src/mathic.h
+++ b/src/mathic.h
@@ -29,3 +29,10 @@
 #include "mathic/IntegerParameter.h"
 #include "mathic/StringParameter.h"
 #include "mathic/display.h"
+
+extern "C" {
+  // Put a C function in the library so that it can be detected by the autoconf
+  // macro AC_CHECK_LIB. That macro can only check for libraries that contain
+  // at least one C function.
+  void libmathicIsPresent(void); // This function does nothing.
+}

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