Import isl(+imath) as an external library into Polly

With this patch Polly is always GPL-free (no dependency on GMP any more). As a
result, building and distributing Polly will be easier. Furthermore, there is no
need to tightly coordinate isl and Polly releases anymore.

We import isl b3e0fa7a05d as well as imath 4d707e5ef2. These are the git
versions Polly currently was tested with when using utils/checkout_isl.sh. The
imported libraries are both MIT-style licensed.

We build isl and imath with -fvisibility=hidden to avoid clashes in case other
projects (such as gcc) use conflicting versions of isl. The use of imath can
temporarily reduce compile-time performance of Polly. We will work on
performance tuning in tree.

Patches to isl should be contributed first to the main isl repository and can
then later be reimported to Polly.

This patch is also a prerequisite for the upcoming isl C++ interface.

llvm-svn: 228193

1 files changed, 20 insertions, 8 deletions

diff --git a/polly/CMakeLists.txt b/polly/CMakeLists.txt
index 6e72fbabfc6..76919181ada 100644
--- a/polly/CMakeLists.txt
+++ b/polly/CMakeLists.txt
@@ -76,23 +76,29 @@ endif ()
 
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-exceptions -fno-rtti")
 
+# Define the FLAGS for the compilation of isl and imath
+#
+# Those are the only C files we have in the repository. Hence, we can just use
+# the CFLAGS to identify them.
+#
+# We first set the visibility of all isl functions to hidden to ensure we do
+# not clash with other isl versions that got linked into a program that uses
+# Polly. (This happens e.g when linking Polly with dragonegg)
+#
+# We also disable all warnings, as these should be fixed upstream. There is
+# no value in reporting them here.
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fvisibility=hidden -w")
+
 # Add path for custom modules
 set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${POLLY_SOURCE_DIR}/cmake")
 
 SET(CMAKE_INSTALL_RPATH_USE_LINK_PATH TRUE)
 
-FIND_PACKAGE(Isl REQUIRED)
-set(POLLY_LINK_LIBS ${ISL_LIBRARY})
-
 FIND_PACKAGE(Pluto)
 if(PLUTO_FOUND)
   set(POLLY_LINK_LIBS ${POLLY_LINK_LIBS} ${PLUTO_LIBRARY})
 endif(PLUTO_FOUND)
 
-if(GMP_FOUND)
-  set(POLLY_LINK_LIBS ${POLLY_LINK_LIBS} ${GMP_LIBRARY})
-endif(GMP_FOUND)
-
 option(POLLY_ENABLE_GPGPU_CODEGEN "Enable GPGPU code generation feature" OFF)
 if (POLLY_ENABLE_GPGPU_CODEGEN)
   # Do not require CUDA, as GPU code generation test cases can be run without
@@ -118,6 +124,9 @@ include_directories(
   BEFORE
   ${CMAKE_CURRENT_SOURCE_DIR}/include
   ${CMAKE_CURRENT_SOURCE_DIR}/lib/JSON/include
+  ${CMAKE_CURRENT_SOURCE_DIR}/lib/External/isl/include
+  ${CMAKE_CURRENT_SOURCE_DIR}/lib/External/isl/imath
+  ${CMAKE_CURRENT_SOURCE_DIR}/lib/External/isl
   ${CMAKE_CURRENT_BINARY_DIR}/include
   )
 
@@ -151,7 +160,10 @@ configure_file( ${CMAKE_CURRENT_SOURCE_DIR}/include/polly/Config/config.h.cmake
 # Add target to check formatting of polly files
 file( GLOB_RECURSE files *.h *.cpp)
 file( GLOB_RECURSE jsonfiles lib/JSON/*.h lib/JSON/*.cpp)
-list( REMOVE_ITEM files ${jsonfiles} )
+file( GLOB_RECURSE islfiles lib/External/isl/*.h lib/External/isl/*.c
+                   lib/External/isl/include/isl/*.h lib/External/isl/imath/*.h
+                   lib/External/isl/imath/*.c)
+list( REMOVE_ITEM files ${jsonfiles} ${islfiles})
 add_custom_command( OUTPUT formatting COMMAND
   CLANG_FORMAT=${LLVM_BINARY_DIR}/bin/clang-format
   ${CMAKE_CURRENT_SOURCE_DIR}/utils/check_format.sh ${files})