[Bf-blender-cvs] [9333bb57eca] cycles_oneapi: CMake Deps: Use self-compiled Flex on Linux

[Sergey Sharybin]

Commit: 9333bb57eca93dc4c06966ea590c84dc323bf53f
Author: Sergey Sharybin
Date:   Wed Jun 1 14:53:46 2022 +0200
Branches: cycles_oneapi
https://developer.blender.org/rB9333bb57eca93dc4c06966ea590c84dc323bf53f

CMake Deps: Use self-compiled Flex on Linux

Solves compilation error if IGC on centOS 7 where system-wide
Flex is too old and leads to the -Werror=register errors in the
generated code.

===================================================================

M	build_files/build_environment/cmake/igc.cmake

===================================================================

diff --git a/build_files/build_environment/cmake/igc.cmake b/build_files/build_environment/cmake/igc.cmake
index cbdad0f2e5a..e8ca0d63eb0 100644
--- a/build_files/build_environment/cmake/igc.cmake
+++ b/build_files/build_environment/cmake/igc.cmake
@@ -1,7 +1,5 @@
 # SPDX-License-Identifier: GPL-2.0-or-later
 
-# CAUTION: igc requires flex 2.6.4 this is not by default available on centos 7
-
 unpack_only(igc_llvm)
 unpack_only(igc_opencl_clang)
 unpack_only(igc_vcintrinsics)
@@ -22,6 +20,13 @@ set(IGC_EXTRA_ARGS
   -DIGC_OPTION__ARCHITECTURE_HOST=${IGC_TARGET}
 )
 
+if(UNIX AND NOT APPLE)
+  list(APPEND IGC_EXTRA_ARGS
+       -DFLEX_EXECUTABLE=${LIBDIR}/flex/bin/flex
+       -DFLEX_INCLUDE_DIR=${LIBDIR}/flex/include
+  )
+endif()
+
 ExternalProject_Add(external_igc
   URL file://${PACKAGE_DIR}/${IGC_FILE}
   DOWNLOAD_DIR ${DOWNLOAD_DIR}
@@ -77,3 +82,9 @@ add_dependencies(
   external_igc_spirv_translator
 )
 
+if(UNIX AND NOT APPLE)
+  add_dependencies(
+    external_igc
+    external_flex
+  )
+endif()