[build] Centralizes pkg-config detection and closes #156

Author: anjos

CMakeLists.txt

@@ -272,6 +272,12 @@ endmacro()
 # End of macros
 # ----------------------------------------------------------------------------
 
+# Double-checks pkg-config is reachable
+include(FindPkgConfig)
+if(NOT PKG_CONFIG_FOUND)
+  message(FATAL_ERROR "error: could not find binary for `pkg-config' - you cannot build Bob without it.")
+endif()
+
 # Project files
 set(ENABLED_PACKAGES "")
 add_subdirectory(src)

src/blitz.cmake

@@ -7,8 +7,6 @@
 # also defined, but not for general use are
 #  Blitz_LIBRARY, where to find the Blitz library.
 
-include(FindPkgConfig)
-
 execute_process(COMMAND ${PKG_CONFIG_EXECUTABLE} blitz --silence-errors --modversion OUTPUT_VARIABLE PKG_CONFIG_blitz_VERSION OUTPUT_STRIP_TRAILING_WHITESPACE)
 
 if(PKG_CONFIG_blitz_VERSION)

src/io/CMakeLists.txt

@@ -44,7 +44,6 @@ endif()
 
 # Matio
 if (WITH_MATIO)
-  include(FindPkgConfig)
   pkg_check_modules(matio matio)
   if(matio_FOUND)
     include(CheckCSourceCompiles)