From 5da1f631bc753655ac94b08a6233eecd0d451327 Mon Sep 17 00:00:00 2001 From: "Arnout Vandecappelle (Essensium/Mind)" Date: Fri, 26 Aug 2016 21:55:06 +0200 Subject: [PATCH] Fix LTO support for cross-compilation. When cross-compiling, the ar and ranlib to be used for LTO are prefixed by the cross-tuple. gcc-ar and gcc-ranlib may not exist. Cfr. http://autobuild.buildroot.net/results/f3c/f3c48da3a9706cd366c0e0a96c3cd0ff959f2a78/ Therefore, search for an appropriate lto-ar and lto-ranlib before enabling LTO. Signed-off-by: Arnout Vandecappelle (Essensium/Mind) --- Submitted upstream: https://github.com/tomba/kmsxx/pull/14 --- CMakeLists.txt | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/CMakeLists.txt b/CMakeLists.txt index e5b5ea5..c61c81d 100644 --- a/CMakeLists.txt +++ b/CMakeLists.txt @@ -39,9 +39,15 @@ if (NOT ${U_CMAKE_BUILD_TYPE} MATCHES DEBUG) CHECK_CXX_COMPILER_FLAG("-flto" HAS_LTO_FLAG) if (HAS_LTO_FLAG) - set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -flto") - set(CMAKE_AR gcc-ar) - set(CMAKE_RANLIB gcc-ranlib) + find_program(LTO_AR NAMES "${CMAKE_C_COMPILER}-ar" gcc-ar) + find_program(LTO_RANLIB NAMES "${CMAKE_C_COMPILER}-ranlib" gcc-ranlib) + if (LTO_AR AND LTO_RANLIB) + set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -flto") + set(CMAKE_AR "${LTO_AR}") + set(CMAKE_RANLIB "${LTO_RANLIB}") + else() + message(STATUS "gcc-ar or gcc-ranlib not found, disabling LTO") + endif() endif() endif() -- 2.9.3