Add cmake option ENABLE_BITCODE for iOS builds
Change-Id: Ib56c711c626044754c1c3a397d7c4648c4ec089d
diff --git a/CMakeLists.txt b/CMakeLists.txt
index f24f173..b247c71 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -153,6 +153,8 @@
if (APPLE)
option(ACCELERATESPARSE
"Enable use of sparse solvers in Apple's Accelerate framework." ON)
+ option(ENABLE_BITCODE
+ "Enable bitcode for iOS builds (disables inline optimizations for Eigen)." OFF)
endif()
option(CUDA "Enable use of CUDA linear algebra solvers." ON)
option(LAPACK "Enable use of LAPACK directly within Ceres." ON)
@@ -631,14 +633,20 @@
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${CERES_STRICT_CXX_FLAGS}")
endif (UNIX)
-# Use a larger inlining threshold for Clang, since it hobbles Eigen,
-# resulting in an unreasonably slow version of the blas routines. The
-# -Qunused-arguments is needed because CMake passes the inline
-# threshold to the linker and clang complains about it and dies.
if (CMAKE_CXX_COMPILER_ID MATCHES "Clang") # Matches Clang & AppleClang.
- set(CMAKE_CXX_FLAGS
- "${CMAKE_CXX_FLAGS} -Qunused-arguments -mllvm -inline-threshold=600")
-
+ # Optimize for Eigen OR enable bitcode; you cannot do both since bitcode is an
+ # intermediate representation.
+ if (ENABLE_BITCODE)
+ set(CMAKE_CXX_FLAGS
+ "${CMAKE_CXX_FLAGS} -fembed-bitcode")
+ else ()
+ # Use a larger inlining threshold for Clang, since it hobbles Eigen,
+ # resulting in an unreasonably slow version of the blas routines. The
+ # -Qunused-arguments is needed because CMake passes the inline
+ # threshold to the linker and clang complains about it and dies.
+ set(CMAKE_CXX_FLAGS
+ "${CMAKE_CXX_FLAGS} -Qunused-arguments -mllvm -inline-threshold=600")
+ endif ()
# Older versions of Clang (<= 2.9) do not support the 'return-type-c-linkage'
# option, so check for its presence before adding it to the default flags set.
include(CheckCXXCompilerFlag)
