From d33554b5ed481b06beca09c78b7d4427ad135f30 Mon Sep 17 00:00:00 2001
From: Matthias Vogelgesang <matthias.vogelgesang@kit.edu>
Date: Fri, 6 Mar 2015 09:40:08 +0100
Subject: Replace dashes with underscores in pkg-config

---
 common/cmake/PkgConfigVars.cmake | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/common/cmake/PkgConfigVars.cmake b/common/cmake/PkgConfigVars.cmake
index fcb7bc6..f295457 100644
--- a/common/cmake/PkgConfigVars.cmake
+++ b/common/cmake/PkgConfigVars.cmake
@@ -1,8 +1,24 @@
+# - determine variables defined in pkg-config files
+#
+# Usage:
+#   pkg_check_variable(<PKG_NAME> <VARIABLE_NAME>)
+#
+# Checks for a variable in the given package and translates to a call such as
+# `pkg-config --variable=<VARIABLE_NAME> <PKG_NAME>`. The output is a cached
+# variable named
+#
+#   <PKG_NAME>_<VARIABLE_NAME>
+#
+# Note that both names are uppercased and any dashes replaced by underscores.
+#
+
 find_package(PkgConfig REQUIRED)
 
 function(pkg_check_variable _pkg _name)
     string(TOUPPER ${_pkg} _pkg_upper)
     string(TOUPPER ${_name} _name_upper)
+    string(REPLACE "-" "_" _pkg_upper ${_pkg_upper})
+    string(REPLACE "-" "_" _name_upper ${_name_upper})
     set(_output_name "${_pkg_upper}_${_name_upper}")
 
     execute_process(COMMAND ${PKG_CONFIG_EXECUTABLE} --variable=${_name} ${_pkg}
-- 
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