lokinet/cmake/enable_lto.cmake

# -flto
include(CheckIPOSupported)
option(WITH_LTO "enable lto on compile time" ON)
if(WITH_LTO)
  if(WIN32)
    message(FATAL_ERROR "LTO not supported on win32 targets, please set -DWITH_LTO=OFF")
  endif()
  check_ipo_supported(RESULT IPO_ENABLED OUTPUT ipo_error)
  if(IPO_ENABLED)
    message(STATUS "LTO enabled")
  else()
    message(WARNING "LTO not supported by compiler: ${ipo_error}")
  endif()
else()
  message(STATUS "LTO disabled")
  set(IPO_ENABLED OFF)
endif()

function(enable_lto)
  if(IPO_ENABLED)
    set_target_properties(${ARGN} PROPERTIES INTERPROCEDURAL_OPTIMIZATION ON)
  endif()
endfunction()
cmake refactor Refactors many things in cmake to improve and simplify: - don't use variable indirection for target names; target names are already a variable of sorts. (e.g. ${UTIL_LIB} is now just lokinet-util). cmake/basic_definitions.cmake is now gone. - fix LTO enabling to use the standard cmake (3.9+) LTO mechanism rather than shoving a bunch of flag hacks through link_libraries and add_compile_options. This also now enables LTO when building a shared library (because previously the -flto hacks were only turned on in the static code for some reason). - build liblokinet as either shared library or static library, but not both. Building both makes things more complicated because they had different names (lokinet-shared or lokinet-static) and seems pointless: you generally want one or the other. Now there is just the liblokinet target, which will be shared or static depending on the value of BUILD_SHARED_LIBS. - Simplify lokinet-cryptography AVX2 code: just build one library, and add in the additional AVX2 files when possible, rather than building two and needing to merge them. - Compress STATIC_LINK and STATIC_LINK_RUNTIME into just STATIC_LINK. It makes no sense to use one of these (_RUNTIME) on Windows and the other on non-Windows when they appear to try to do the same thing. - remove a bunch of annotations from `endif(FOO)` -> `endif()`. - move all the tuntap compilation code (including OS-specific source file selection) into vendor/CMakeLists.txt and build tuntap as an intermediate OBJECT library rather than keeping a global variable in 5 different files. - move release motto define to root cmake; it made no sense being duplicated in both unix.cmake and win32.cmake - fix add_log_tag to not stomp on any existing source compile flags with its definition. Also use proper compile definition property instead of cramming it into compile flags. - make optimization/linker flags less hacky. There's no reason for us to force particular optimization flags because the cmake build type already does that (e.g. -DCMAKE_BUILD_TYPE=Release does -O3). Not doing that also silences a bunch of cmake warnings because it thinks "-O0 -g3" etc. are link libraries (which is reasonable: that's what the code was telling cmake they are). - sets the default build type to RelWithDebInfo which gives us `-O2 -g` if you don't specify a build type. - Move PIC up (so that the things loaded in unix.cmake, notably libuv, have it set). - Add a custom `curl` interface library that carries the correct link target and include paths for curl (system or bundled). 4 years ago			`# -flto`
			`include(CheckIPOSupported)`
add WITH_LTO option to disble lto on compile time 4 years ago			`option(WITH_LTO "enable lto on compile time" ON)`
			`if(WITH_LTO)`
changeset for windows port * wintun vpn platform for windows * bundle config snippets into nsis installer for exit node, keyfile persisting, reduced hops mode. * use wintun for vpn platform * isolate all windows platform specific code into their own compilation units and libraries * split up internal libraries into more specific components * rename liblokinet.a target to liblokinet-amalgum.a to elimiate ambiguity with liblokinet.so * DNS platform for win32 * rename llarp/ev/ev_libuv.{c,h}pp to llarp/ev/libuv.{c,h}pp as the old name was idiotic * split up net platform into win32 and posix specific compilation units * rename lokinet_init.c to easter_eggs.cpp as that is what they are for and it does not need to be a c compilation target * add cmake option STRIP_SYMBOLS for seperating out debug symbols for windows builds * intercept dns traffic on all interfaces on windows using windivert and feed it into lokinet 2 years ago			`if(WIN32)`
			`message(FATAL_ERROR "LTO not supported on win32 targets, please set -DWITH_LTO=OFF")`
			`endif()`
add WITH_LTO option to disble lto on compile time 4 years ago			`check_ipo_supported(RESULT IPO_ENABLED OUTPUT ipo_error)`
			`if(IPO_ENABLED)`
			`message(STATUS "LTO enabled")`
			`else()`
			`message(WARNING "LTO not supported by compiler: ${ipo_error}")`
			`endif()`
cmake refactor Refactors many things in cmake to improve and simplify: - don't use variable indirection for target names; target names are already a variable of sorts. (e.g. ${UTIL_LIB} is now just lokinet-util). cmake/basic_definitions.cmake is now gone. - fix LTO enabling to use the standard cmake (3.9+) LTO mechanism rather than shoving a bunch of flag hacks through link_libraries and add_compile_options. This also now enables LTO when building a shared library (because previously the -flto hacks were only turned on in the static code for some reason). - build liblokinet as either shared library or static library, but not both. Building both makes things more complicated because they had different names (lokinet-shared or lokinet-static) and seems pointless: you generally want one or the other. Now there is just the liblokinet target, which will be shared or static depending on the value of BUILD_SHARED_LIBS. - Simplify lokinet-cryptography AVX2 code: just build one library, and add in the additional AVX2 files when possible, rather than building two and needing to merge them. - Compress STATIC_LINK and STATIC_LINK_RUNTIME into just STATIC_LINK. It makes no sense to use one of these (_RUNTIME) on Windows and the other on non-Windows when they appear to try to do the same thing. - remove a bunch of annotations from `endif(FOO)` -> `endif()`. - move all the tuntap compilation code (including OS-specific source file selection) into vendor/CMakeLists.txt and build tuntap as an intermediate OBJECT library rather than keeping a global variable in 5 different files. - move release motto define to root cmake; it made no sense being duplicated in both unix.cmake and win32.cmake - fix add_log_tag to not stomp on any existing source compile flags with its definition. Also use proper compile definition property instead of cramming it into compile flags. - make optimization/linker flags less hacky. There's no reason for us to force particular optimization flags because the cmake build type already does that (e.g. -DCMAKE_BUILD_TYPE=Release does -O3). Not doing that also silences a bunch of cmake warnings because it thinks "-O0 -g3" etc. are link libraries (which is reasonable: that's what the code was telling cmake they are). - sets the default build type to RelWithDebInfo which gives us `-O2 -g` if you don't specify a build type. - Move PIC up (so that the things loaded in unix.cmake, notably libuv, have it set). - Add a custom `curl` interface library that carries the correct link target and include paths for curl (system or bundled). 4 years ago			`else()`
add WITH_LTO option to disble lto on compile time 4 years ago			`message(STATUS "LTO disabled")`
			`set(IPO_ENABLED OFF)`
cmake refactor Refactors many things in cmake to improve and simplify: - don't use variable indirection for target names; target names are already a variable of sorts. (e.g. ${UTIL_LIB} is now just lokinet-util). cmake/basic_definitions.cmake is now gone. - fix LTO enabling to use the standard cmake (3.9+) LTO mechanism rather than shoving a bunch of flag hacks through link_libraries and add_compile_options. This also now enables LTO when building a shared library (because previously the -flto hacks were only turned on in the static code for some reason). - build liblokinet as either shared library or static library, but not both. Building both makes things more complicated because they had different names (lokinet-shared or lokinet-static) and seems pointless: you generally want one or the other. Now there is just the liblokinet target, which will be shared or static depending on the value of BUILD_SHARED_LIBS. - Simplify lokinet-cryptography AVX2 code: just build one library, and add in the additional AVX2 files when possible, rather than building two and needing to merge them. - Compress STATIC_LINK and STATIC_LINK_RUNTIME into just STATIC_LINK. It makes no sense to use one of these (_RUNTIME) on Windows and the other on non-Windows when they appear to try to do the same thing. - remove a bunch of annotations from `endif(FOO)` -> `endif()`. - move all the tuntap compilation code (including OS-specific source file selection) into vendor/CMakeLists.txt and build tuntap as an intermediate OBJECT library rather than keeping a global variable in 5 different files. - move release motto define to root cmake; it made no sense being duplicated in both unix.cmake and win32.cmake - fix add_log_tag to not stomp on any existing source compile flags with its definition. Also use proper compile definition property instead of cramming it into compile flags. - make optimization/linker flags less hacky. There's no reason for us to force particular optimization flags because the cmake build type already does that (e.g. -DCMAKE_BUILD_TYPE=Release does -O3). Not doing that also silences a bunch of cmake warnings because it thinks "-O0 -g3" etc. are link libraries (which is reasonable: that's what the code was telling cmake they are). - sets the default build type to RelWithDebInfo which gives us `-O2 -g` if you don't specify a build type. - Move PIC up (so that the things loaded in unix.cmake, notably libuv, have it set). - Add a custom `curl` interface library that carries the correct link target and include paths for curl (system or bundled). 4 years ago			`endif()`

			`function(enable_lto)`
			`if(IPO_ENABLED)`
			`set_target_properties(${ARGN} PROPERTIES INTERPROCEDURAL_OPTIMIZATION ON)`
			`endif()`
			`endfunction()`