From a8b48bc7f5355b951b30bc656f7c7c03b69c0329 Mon Sep 17 00:00:00 2001
From: Allen Byrne <byrn@hdfgroup.org>
Date: Wed, 21 May 2014 09:29:41 -0500
Subject: [svn-r25208] Make the header generation optional and depend on
 finding perl executable. Needed because window does not have perl.

---
 src/CMakeLists.txt | 68 +++++++++++++++++++++++++++++-------------------------
 1 file changed, 37 insertions(+), 31 deletions(-)

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 5b6c11a..8fd232b 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -805,37 +805,43 @@ add_custom_command (
     WORKING_DIRECTORY ${HDF5_BINARY_DIR}
 )
 
-set (CMDPERL perl)
-add_custom_command (
-    OUTPUT ${HDF5_BINARY_DIR}/H5Edefin.h
-    PRE_BUILD
-    COMMAND ${CMDPERL}
-    ARGS ${HDF5_SOURCE_DIR}/bin/make_err ${HDF5_SOURCE_DIR}/src/H5err.txt
-    DEPENDS ${HDF5_SOURCE_DIR}/src/H5err.txt
-    COMMENT " Creating err header"
-)
-
-add_custom_command (
-    OUTPUT ${HDF5_BINARY_DIR}/H5version.h
-    PRE_BUILD
-    COMMAND ${CMDPERL}
-    ARGS ${HDF5_SOURCE_DIR}/bin/make_vers ${HDF5_SOURCE_DIR}/src/H5vers.txt
-    DEPENDS ${HDF5_SOURCE_DIR}/src/H5vers.txt
-    COMMENT " Creating API version macro"
-)
-
-add_custom_command (
-    OUTPUT ${HDF5_BINARY_DIR}/H5overflow.h
-    PRE_BUILD
-    COMMAND ${CMDPERL}
-    ARGS ${HDF5_SOURCE_DIR}/bin/make_overflow ${HDF5_SOURCE_DIR}/src/H5overflow.txt
-    DEPENDS ${HDF5_SOURCE_DIR}/src/H5overflow.txt
-    COMMENT " Creating Assignment overflow macro"
-)
-
-add_custom_target(run_perl_scripts ALL
-    DEPENDS ${HDF5_BINARY_DIR}/H5Edefin.h ${HDF5_BINARY_DIR}/H5version.h ${HDF5_BINARY_DIR}/H5overflow.h
-)
+if (GENERATE_ERROR_HEADERS)
+  find_pacakge (Perl)
+  if (PERL_FOUND)
+    add_custom_command (
+        OUTPUT ${HDF5_BINARY_DIR}/H5Edefin.h
+        PRE_BUILD
+        COMMAND ${PERL_EXECUTABLE}
+        ARGS ${HDF5_SOURCE_DIR}/bin/make_err ${HDF5_SOURCE_DIR}/src/H5err.txt
+        DEPENDS ${HDF5_SOURCE_DIR}/src/H5err.txt
+        COMMENT " Creating err header"
+    )
+
+    add_custom_command (
+        OUTPUT ${HDF5_BINARY_DIR}/H5version.h
+        PRE_BUILD
+        COMMAND ${PERL_EXECUTABLE}
+        ARGS ${HDF5_SOURCE_DIR}/bin/make_vers ${HDF5_SOURCE_DIR}/src/H5vers.txt
+        DEPENDS ${HDF5_SOURCE_DIR}/src/H5vers.txt
+       COMMENT " Creating API version macro"
+    )
+
+    add_custom_command (
+        OUTPUT ${HDF5_BINARY_DIR}/H5overflow.h
+        PRE_BUILD
+        COMMAND ${PERL_EXECUTABLE}
+        ARGS ${HDF5_SOURCE_DIR}/bin/make_overflow ${HDF5_SOURCE_DIR}/src/H5overflow.txt
+        DEPENDS ${HDF5_SOURCE_DIR}/src/H5overflow.txt
+        COMMENT " Creating Assignment overflow macro"
+    )
+
+    add_custom_target(run_perl_scripts ALL
+        DEPENDS ${HDF5_BINARY_DIR}/H5Edefin.h ${HDF5_BINARY_DIR}/H5version.h ${HDF5_BINARY_DIR}/H5overflow.h
+    )
+  else (PERL_FOUND)
+    message (STATUS "Cannot generate headers - perl not found")
+  endif (PERL_FOUND)
+endif (GENERATE_ERROR_HEADERS)
 
 #-----------------------------------------------------------------------------
 # Add H5Tinit source to build - generated by H5Detect/CMake at configure time
-- 
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