From 54e1a2b16853d4a395138d20e9d190208e889126 Mon Sep 17 00:00:00 2001
From: Pino Toscano <pino@kde.org>
Date: Tue, 11 Dec 2007 20:38:08 +0000
Subject: [PATCH] optionally set a minimum required version

svn path=/trunk/KDE/kdegraphics/cmake/modules/; revision=747373
---
 cmake/modules/FindLIBGS.cmake | 36 +++++++++++++++++++++++++++++++++--
 1 file changed, 34 insertions(+), 2 deletions(-)

diff --git a/cmake/modules/FindLIBGS.cmake b/cmake/modules/FindLIBGS.cmake
index 0cf8ca632..e02c42c9b 100644
--- a/cmake/modules/FindLIBGS.cmake
+++ b/cmake/modules/FindLIBGS.cmake
@@ -11,6 +11,7 @@
 # For details see the accompanying COPYING-CMAKE-SCRIPTS file.
 
 include(CheckLibraryExists)
+include(CheckCSourceRuns)
 
 if (LIBGS_LIBRARY)
   # in cache already
@@ -32,13 +33,44 @@ else (LIBGS_LIBRARY)
   endif(LIBGS_LIBRARY)
   set(CMAKE_LIBRARY_PATH)
 
+  if (LIBGS_MINIMUM_VERSION)
+    string(REPLACE "." "" mingsver "${LIBGS_MINIMUM_VERSION}")
+    set(CMAKE_REQUIRED_LIBRARIES "${LIBGS_LIBRARY}")
+set(CMAKE_REQUIRED_INCLUDES "${CMAKE_CURRENT_SOURCE_DIR}/spectre/libspectre")
+    check_c_source_runs("
+#include <ghostscript/iapi.h>
+
+int main(int argc, char **argv)
+{
+  gsapi_revision_t gsrev;
+
+  if (gsapi_revision(&gsrev, sizeof(gsrev)) != 0)
+    return 1;
+  if (gsrev.revision < ${mingsver})
+    return 1;
+
+  return 0;
+}
+" HAVE_LIBGS_MINIMUM_VERSION)
+    set(CMAKE_REQUIRED_LIBRARIES)
+    if (NOT HAVE_LIBGS_MINIMUM_VERSION)
+      set(LIBGS_FOUND FALSE)
+    endif (NOT HAVE_LIBGS_MINIMUM_VERSION)
+  endif (LIBGS_MINIMUM_VERSION)
+
+  if (LIBGS_MINIMUM_VERSION)
+    set(gsLibraryMessage " (v${LIBGS_MINIMUM_VERSION})")
+  else (LIBGS_MINIMUM_VERSION)
+    set(gsLibraryMessage "")
+  endif (LIBGS_MINIMUM_VERSION)
+
   if (LIBGS_FOUND)
     if (NOT LIBGS_FIND_QUIETLY)
-      message(STATUS "Found the GS library: ${LIBGS_LIBRARY}")
+      message(STATUS "Found the GS library${gsLibraryMessage}: ${LIBGS_LIBRARY}")
     endif (NOT LIBGS_FIND_QUIETLY)
   else (LIBGS_FOUND)
     if (LIBGS_FIND_REQUIRED)
-      message(FATAL_ERROR "Could NOT find the GS library")
+      message(FATAL_ERROR "Could NOT find the GS library${gsLibraryMessage}")
     endif (LIBGS_FIND_REQUIRED)
   endif (LIBGS_FOUND)