package/fastd/0001-cmake-use-INTERPROCEDURAL_OPTIMIZATION-target-proper.patch

   1 From: Alexander Dahl <alex@netz39.de>
   2 Date: Wed, 28 Oct 2015 16:04:13 +0100
   3 Subject: [PATCH] cmake: use INTERPROCEDURAL_OPTIMIZATION target property
   4
   5 Instead of hacking on compiler flags use the cmake way for handling
   6 interprocedural optimization. Tests showed cmake currently ignores this
   7 for gcc and clang, at least on Debian Wheezy and Jessie. This actually
   8 results in no interprocedural optimization for the moment. However it
   9 allows to compile fastd against a toolchain without LTO support, which
  10 was broken because of a hack included here for finding binutils.
  11
  12 According to the upstream author of fastd the main reason for enabling
  13 LTO was binary size on an OpenWRT target for Freifunk Gluon, where they
  14 have very few space left on devices with only 4 MB flash memory.
  15
  16 Signed-off-by: Alexander Dahl <post@lespocky.de>
  17 ---
  18  cmake/checks.cmake | 14 --------------
  19  src/CMakeLists.txt |  9 +++++++++
  20  2 files changed, 9 insertions(+), 14 deletions(-)
  21
  22 diff --git a/cmake/checks.cmake b/cmake/checks.cmake
  23 index 27c073f..8a671a1 100644
  24 --- a/cmake/checks.cmake
  25 +++ b/cmake/checks.cmake
  26 @@ -10,20 +10,6 @@ if(ARCH_X86 OR ARCH_X86_64)
  27  endif(ARCH_X86 OR ARCH_X86_64)
  28
  29
  30 -
  31 -if(ENABLE_LTO)
  32 -  set(CFLAGS_LTO "-flto")
  33 -  set(CFLAGS_NO_LTO "-fno-lto")
  34 -
  35 -  check_c_compiler_flag("-fwhole-program" HAVE_FLAG_WHOLE_PROGRAM)
  36 -  if(HAVE_FLAG_WHOLE_PROGRAM)
  37 -    set(LDFLAGS_LTO "-flto -fwhole-program")
  38 -  else(HAVE_FLAG_WHOLE_PROGRAM)
  39 -    set(LDFLAGS_LTO "-flto")
  40 -  endif(HAVE_FLAG_WHOLE_PROGRAM)
  41 -endif(ENABLE_LTO)
  42 -
  43 -
  44  check_c_source_compiles("
  45  #include <sys/types.h>
  46  #include <sys/socket.h>
  47 diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
  48 index 829b3ab..7612b40 100644
  49 --- a/src/CMakeLists.txt
  50 +++ b/src/CMakeLists.txt
  51 @@ -48,6 +48,15 @@ add_executable(fastd
  52  set_property(TARGET fastd PROPERTY COMPILE_FLAGS "${FASTD_CFLAGS}")
  53  set_property(TARGET fastd PROPERTY LINK_FLAGS "${PTHREAD_LDFLAGS} ${LIBUECC_LDFLAGS_OTHER} ${NACL_LDFLAGS_OTHER} ${JSON_C_LDFLAGS_OTHER} ${LDFLAGS_LTO}")
  54  set_property(TARGET fastd APPEND PROPERTY INCLUDE_DIRECTORIES ${LIBCAP_INCLUDE_DIR} ${NACL_INCLUDE_DIRS} ${JSON_C_INCLUDE_DIR})
  55 +if(ENABLE_LTO)
  56 +       set_target_properties(fastd PROPERTIES
  57 +               INTERPROCEDURAL_OPTIMIZATION ON
  58 +       )
  59 +else(ENABLE_LTO)
  60 +       set_target_properties(fastd PROPERTIES
  61 +               INTERPROCEDURAL_OPTIMIZATION OFF
  62 +       )
  63 +endif(ENABLE_LTO)
  64  target_link_libraries(fastd protocols methods ciphers macs ${RT_LIBRARY} ${LIBCAP_LIBRARY} ${LIBUECC_LIBRARIES} ${NACL_LIBRARIES} ${OPENSSL_CRYPTO_LIBRARY} ${JSON_C_LIBRARIES})
  65
  66  add_dependencies(fastd version)
  67 --
  68 2.1.4
  69