mirror of
https://github.com/curl/curl.git
synced 2026-04-14 22:11:45 +03:00
66ad54e46b
To enable known linker options dropping unused, dead, code and data from the executables built. Useful to reduce binary sizes for curl, libcurl shared lib and apps linking static libcurl. It's effective on both "unity" and non-unity builds. Aligning "unity" build sizes with default, non-unity ones. Supported platforms: Apple, MSVC, llvm/clang and GCC on all tested platforms: Linux, BSDs, Windows, MSYS2/Cygwin, Android, MS-DOS. Notes: - Static libraries grow 20-30% with non-Apple toolchains. This effect is controlled by separate, optional compiler flags on non-Apple. This patch enables them automatically for public binaries (libcurl and curl tool), and leaves them off for internal/test ones. - MSVC enables this option by default for 'Release' configurations. The curl build option has no effect on it. - Observed effect on VS2010 is negligible. VS2012+ is recommended. - Works with LTO, Fil-C. - No observed/conclusive effect on build speed. - On Windows with clang/gcc (mingw-w64/MSYS2/Cygwin) it also enables `-fno-asynchronous-unwind-tables` as a workaround to make the toolchain options actually work. Ref: https://sourceware.org/bugzilla/show_bug.cgi?id=11539 Thanks-to: Andarwinux Also: - GHA: enable in Linux and MinGW jobs to test it. Size changes: - linux aws-lc H3: curl: 2000000 -> 1937152, libcurl.a: 2065724 -> 2716532 bytes - macos clang HTTP-only: curl: 1364376 -> 128799 bytes, libcurl.a: unchanged - macos llvm MultiSSL: curl: 410056 -> 405720, libcurl.dylib: 1350336 -> 1348480 bytes - mingw schannel c-ares U: curl: 1588736 -> 1507328, libcurl-d.a: 3322040 -> 3884746 bytes bld: 34 -> 35MB - GHA: enable in MSVC and Apple jobs to reduce disk footprint, with no obvious downside. Size changes: - AppVeyor CI VS2019: curl: 2339840 -> 1295872, libcurl-d.dll: 3155968 -> 1900544 bytes bld: 161 -> 97MB - AppVeyor CI VS2022 clang-cl: curl: 2933248 -> 2332160, libcurl-d.lib: 4762688 -> 5511330 bytes bld: 133 -> 121MB - AppVeyor CI VS2022 HTTP-only: curl: 3514368 -> 2177024, libcurl-d.lib: 2538420 -> 3151740 bytes bld: 137 -> 83MB - GHA intel: curl: 2629120 -> 2023424, libcurl-d.lib: 4366652 -> 5350670 bytes bld: 86 -> 69MB - GHA arm64: curl: 2832896 -> 2063872, libcurl-d.lib: 4690616 -> 5597250 bytes bld: 82 -> 66MB Refs: https://maskray.me/blog/2021-02-28-linker-garbage-collection https://web.archive.org/web/20110811230637/msdn.microsoft.com/en-us/library/bxwfs976.aspx (VS2010) https://learn.microsoft.com/cpp/build/reference/opt-optimizations https://learn.microsoft.com/cpp/build/reference/gy-enable-function-level-linking Closes #20357
360 lines
15 KiB
CMake
360 lines
15 KiB
CMake
#***************************************************************************
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# _ _ ____ _
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# Project ___| | | | _ \| |
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# / __| | | | |_) | |
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# | (__| |_| | _ <| |___
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# \___|\___/|_| \_\_____|
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#
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# Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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#
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# This software is licensed as described in the file COPYING, which
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# you should have received as part of this distribution. The terms
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# are also available at https://curl.se/docs/copyright.html.
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#
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# You may opt to use, copy, modify, merge, publish, distribute and/or sell
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# copies of the Software, and permit persons to whom the Software is
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# furnished to do so, under the terms of the COPYING file.
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#
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# This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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# KIND, either express or implied.
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#
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# SPDX-License-Identifier: curl
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#
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###########################################################################
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set(LIBCURL_OUTPUT_NAME "${LIB_NAME}" CACHE STRING "Basename of the curl library")
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set_property(DIRECTORY APPEND PROPERTY COMPILE_DEFINITIONS ${CURL_DEBUG_MACROS} "BUILDING_LIBCURL")
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configure_file("curl_config-cmake.h.in" "${CMAKE_CURRENT_BINARY_DIR}/curl_config.h")
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# Get CSOURCES, HHEADERS, LIB_RCFILES variables
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curl_transform_makefile_inc("Makefile.inc" "${CMAKE_CURRENT_BINARY_DIR}/Makefile.inc.cmake")
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include("${CMAKE_CURRENT_BINARY_DIR}/Makefile.inc.cmake")
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list(APPEND HHEADERS "${CMAKE_CURRENT_BINARY_DIR}/curl_config.h")
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# The rest of the build
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set_property(DIRECTORY APPEND PROPERTY INCLUDE_DIRECTORIES
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"${PROJECT_BINARY_DIR}/lib" # for "curl_config.h"
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)
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if(CURL_BUILD_TESTING)
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# special libcurlu library just for unittests
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add_library(curlu STATIC EXCLUDE_FROM_ALL ${HHEADERS} ${CSOURCES})
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target_compile_definitions(curlu PUBLIC "CURL_STATICLIB" "UNITTESTS")
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target_link_libraries(curlu PUBLIC ${CURL_LIBS})
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# There is plenty of parallelism when building the testdeps target.
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# Override the curlu batch size with the maximum to optimize performance.
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set_target_properties(curlu PROPERTIES UNITY_BUILD_BATCH_SIZE 0 C_CLANG_TIDY "")
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add_custom_command(OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/unitprotos.h"
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WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
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COMMAND ${PERL_EXECUTABLE} "${PROJECT_SOURCE_DIR}/scripts/extract-unit-protos"
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${CSOURCES} > "${CMAKE_CURRENT_BINARY_DIR}/unitprotos.h"
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DEPENDS "${PROJECT_SOURCE_DIR}/scripts/extract-unit-protos" ${CSOURCES}
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VERBATIM)
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add_custom_target(curlu-unitprotos DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/unitprotos.h")
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endif()
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## Library definition
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if(NOT DEFINED IMPORT_LIB_SUFFIX)
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# Suffix implib name with "_imp" by default, to avoid conflicting with
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# the generated static "libcurl.lib" (typically with MSVC).
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if(WIN32 AND BUILD_SHARED_LIBS AND
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CMAKE_IMPORT_LIBRARY_SUFFIX STREQUAL CMAKE_STATIC_LIBRARY_SUFFIX)
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set(IMPORT_LIB_SUFFIX "_imp")
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else()
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set(IMPORT_LIB_SUFFIX "")
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endif()
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endif()
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if(NOT DEFINED STATIC_LIB_SUFFIX)
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set(STATIC_LIB_SUFFIX "")
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endif()
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# Detect implib static lib filename collision
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if(WIN32 AND BUILD_STATIC_LIBS AND BUILD_SHARED_LIBS AND
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"${IMPORT_LIB_SUFFIX}${CMAKE_IMPORT_LIBRARY_SUFFIX}" STREQUAL
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"${STATIC_LIB_SUFFIX}${CMAKE_STATIC_LIBRARY_SUFFIX}")
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message(FATAL_ERROR "Library suffix is the same ('${STATIC_LIB_SUFFIX}${CMAKE_STATIC_LIBRARY_SUFFIX}') "
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"for the import and static '${LIBCURL_OUTPUT_NAME}' library. "
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"Set IMPORT_LIB_SUFFIX and/or STATIC_LIB_SUFFIX to different values, "
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"or disable building either the shared or static library to avoid the filename collision.")
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endif()
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# Whether to do a single compilation pass for libcurl sources and reuse these
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# objects to generate both static and shared target.
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if(NOT DEFINED SHARE_LIB_OBJECT)
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# Enable it by default on platforms where PIC is the default for both shared
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# and static and there is a way to tell the linker which libcurl symbols it
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# should export (vs. marking these symbols exportable at compile-time).
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if(WIN32)
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set(SHARE_LIB_OBJECT ON)
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else()
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# On other platforms, make it an option disabled by default
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set(SHARE_LIB_OBJECT OFF)
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endif()
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endif()
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if(SHARE_LIB_OBJECT AND CMAKE_VERSION VERSION_GREATER_EQUAL 3.12)
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set(LIB_OBJECT "libcurl_object")
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add_library(${LIB_OBJECT} OBJECT ${HHEADERS} ${CSOURCES}) # Requires CMake 3.12
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if(WIN32)
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# Define CURL_STATICLIB always, to disable __declspec(dllexport) for
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# exported libcurl symbols. We handle exports via libcurl.def instead.
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# Except with symbol hiding disabled or debug mode enabled, when we export
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# _all_ symbols from libcurl DLL, without using libcurl.def.
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set_property(TARGET ${LIB_OBJECT} APPEND PROPERTY COMPILE_DEFINITIONS "CURL_STATICLIB")
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endif()
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target_link_libraries(${LIB_OBJECT} PRIVATE ${CURL_LIBS})
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set_target_properties(${LIB_OBJECT} PROPERTIES
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POSITION_INDEPENDENT_CODE ON)
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set_property(TARGET ${LIB_OBJECT} APPEND PROPERTY COMPILE_OPTIONS "${CURL_CFLAGS}")
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if(CURL_HIDES_PRIVATE_SYMBOLS)
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set_property(TARGET ${LIB_OBJECT} APPEND PROPERTY COMPILE_OPTIONS "${CURL_CFLAG_SYMBOLS_HIDE}")
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set_property(TARGET ${LIB_OBJECT} APPEND PROPERTY COMPILE_DEFINITIONS "CURL_HIDDEN_SYMBOLS")
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endif()
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if(CURL_HAS_LTO)
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if(CMAKE_CONFIGURATION_TYPES)
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set_target_properties(${LIB_OBJECT} PROPERTIES
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INTERPROCEDURAL_OPTIMIZATION_RELEASE TRUE
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INTERPROCEDURAL_OPTIMIZATION_RELWITHDEBINFO TRUE)
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else()
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set_target_properties(${LIB_OBJECT} PROPERTIES INTERPROCEDURAL_OPTIMIZATION TRUE)
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endif()
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endif()
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if(CURL_CODE_COVERAGE)
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set_property(TARGET ${LIB_OBJECT} APPEND PROPERTY COMPILE_DEFINITIONS ${CURL_COVERAGE_MACROS})
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set_property(TARGET ${LIB_OBJECT} APPEND PROPERTY COMPILE_OPTIONS ${CURL_COVERAGE_CFLAGS})
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endif()
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target_include_directories(${LIB_OBJECT} INTERFACE
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"$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>"
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"$<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/include>")
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set(LIB_SOURCE $<TARGET_OBJECTS:${LIB_OBJECT}>)
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else()
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set(LIB_SOURCE ${HHEADERS} ${CSOURCES})
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endif()
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# We want it to be called libcurl on all platforms
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if(BUILD_STATIC_LIBS)
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list(APPEND libcurl_export ${LIB_STATIC})
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add_library(${LIB_STATIC} STATIC ${LIB_SOURCE})
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add_library(${PROJECT_NAME}::${LIB_STATIC} ALIAS ${LIB_STATIC})
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if(WIN32)
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set_property(TARGET ${LIB_STATIC} APPEND PROPERTY COMPILE_DEFINITIONS "CURL_STATICLIB")
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endif()
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target_link_libraries(${LIB_STATIC} PRIVATE ${CURL_LIBS})
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# Remove the "lib" prefix since the library is already named "libcurl".
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set_target_properties(${LIB_STATIC} PROPERTIES
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PREFIX "" OUTPUT_NAME "${LIBCURL_OUTPUT_NAME}"
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SUFFIX "${STATIC_LIB_SUFFIX}${CMAKE_STATIC_LIBRARY_SUFFIX}"
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INTERFACE_COMPILE_DEFINITIONS "CURL_STATICLIB")
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set_property(TARGET ${LIB_STATIC} APPEND PROPERTY COMPILE_OPTIONS "${CURL_CFLAGS}")
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if(CURL_HIDES_PRIVATE_SYMBOLS)
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set_property(TARGET ${LIB_STATIC} APPEND PROPERTY COMPILE_OPTIONS "${CURL_CFLAG_SYMBOLS_HIDE}")
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set_property(TARGET ${LIB_STATIC} APPEND PROPERTY COMPILE_DEFINITIONS "CURL_HIDDEN_SYMBOLS")
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endif()
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if(CURL_HAS_LTO)
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if(CMAKE_CONFIGURATION_TYPES)
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set_target_properties(${LIB_STATIC} PROPERTIES
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INTERPROCEDURAL_OPTIMIZATION_RELEASE TRUE
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INTERPROCEDURAL_OPTIMIZATION_RELWITHDEBINFO TRUE)
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else()
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set_target_properties(${LIB_STATIC} PROPERTIES INTERPROCEDURAL_OPTIMIZATION TRUE)
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endif()
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endif()
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if(CURL_CODE_COVERAGE)
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set_property(TARGET ${LIB_STATIC} APPEND PROPERTY COMPILE_DEFINITIONS ${CURL_COVERAGE_MACROS})
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set_property(TARGET ${LIB_STATIC} APPEND PROPERTY COMPILE_OPTIONS ${CURL_COVERAGE_CFLAGS})
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endif()
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target_include_directories(${LIB_STATIC} INTERFACE
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"$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>"
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"$<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/include>")
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# CMake before CMP0099 (CMake 3.17 2020-03-20) did not propagate libdirs to
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# targets. It expected libs to have an absolute filename. As a workaround,
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# manually apply dependency libdirs, for CMake consumers without this policy.
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if(CMAKE_VERSION VERSION_GREATER_EQUAL 3.17)
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cmake_policy(GET CMP0099 _has_CMP0099) # https://cmake.org/cmake/help/latest/policy/CMP0099.html
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endif()
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if(NOT _has_CMP0099 AND CMAKE_VERSION VERSION_GREATER_EQUAL 3.13 AND CURL_LIBS)
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set(_curl_libdirs "")
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foreach(_curl_lib IN LISTS CURL_LIBS)
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if(TARGET "${_curl_lib}")
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get_target_property(_curl_libdir "${_curl_lib}" INTERFACE_LINK_DIRECTORIES)
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if(_curl_libdir)
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list(APPEND _curl_libdirs "${_curl_libdir}")
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endif()
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endif()
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endforeach()
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if(_curl_libdirs)
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target_link_directories(${LIB_STATIC} INTERFACE ${_curl_libdirs})
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endif()
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endif()
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endif()
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if(BUILD_SHARED_LIBS)
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list(APPEND libcurl_export ${LIB_SHARED})
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add_library(${LIB_SHARED} SHARED ${LIB_SOURCE})
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add_library(${PROJECT_NAME}::${LIB_SHARED} ALIAS ${LIB_SHARED})
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if(WIN32)
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set_property(TARGET ${LIB_SHARED} APPEND PROPERTY SOURCES "dllmain.c")
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set_property(TARGET ${LIB_SHARED} APPEND PROPERTY SOURCES ${LIB_RCFILES})
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if(CURL_HIDES_PRIVATE_SYMBOLS)
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set_property(TARGET ${LIB_SHARED} APPEND PROPERTY SOURCES "${PROJECT_SOURCE_DIR}/lib/libcurl.def")
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endif()
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endif()
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target_link_libraries(${LIB_SHARED} PRIVATE ${CURL_LIBS})
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# Remove the "lib" prefix since the library is already named "libcurl".
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set_target_properties(${LIB_SHARED} PROPERTIES
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PREFIX "" OUTPUT_NAME "${LIBCURL_OUTPUT_NAME}"
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IMPORT_PREFIX "" IMPORT_SUFFIX "${IMPORT_LIB_SUFFIX}${CMAKE_IMPORT_LIBRARY_SUFFIX}"
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POSITION_INDEPENDENT_CODE ON)
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set_property(TARGET ${LIB_SHARED} APPEND PROPERTY COMPILE_OPTIONS "${CURL_CFLAGS}")
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if(CURL_HIDES_PRIVATE_SYMBOLS)
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set_property(TARGET ${LIB_SHARED} APPEND PROPERTY COMPILE_OPTIONS "${CURL_CFLAG_SYMBOLS_HIDE}")
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set_property(TARGET ${LIB_SHARED} APPEND PROPERTY COMPILE_DEFINITIONS "CURL_HIDDEN_SYMBOLS")
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endif()
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if(CURL_HAS_LTO)
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if(CMAKE_CONFIGURATION_TYPES)
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set_target_properties(${LIB_SHARED} PROPERTIES
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INTERPROCEDURAL_OPTIMIZATION_RELEASE TRUE
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INTERPROCEDURAL_OPTIMIZATION_RELWITHDEBINFO TRUE)
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else()
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set_target_properties(${LIB_SHARED} PROPERTIES INTERPROCEDURAL_OPTIMIZATION TRUE)
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endif()
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endif()
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if(CURL_CODE_COVERAGE)
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set_property(TARGET ${LIB_SHARED} APPEND PROPERTY COMPILE_DEFINITIONS ${CURL_COVERAGE_MACROS})
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set_property(TARGET ${LIB_SHARED} APPEND PROPERTY COMPILE_OPTIONS ${CURL_COVERAGE_CFLAGS})
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if(CMAKE_VERSION VERSION_GREATER_EQUAL 3.13)
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set_property(TARGET ${LIB_SHARED} APPEND PROPERTY LINK_OPTIONS ${CURL_COVERAGE_LDFLAGS})
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else()
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set_property(TARGET ${LIB_SHARED} APPEND PROPERTY LINK_FLAGS ${CURL_COVERAGE_LDFLAGS})
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endif()
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endif()
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target_include_directories(${LIB_SHARED} INTERFACE
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"$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>"
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"$<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/include>")
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if(CMAKE_DLL_NAME_WITH_SOVERSION OR
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CYGWIN OR
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APPLE OR
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CMAKE_SYSTEM_NAME STREQUAL "AIX" OR
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CMAKE_SYSTEM_NAME STREQUAL "Linux" OR
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CMAKE_SYSTEM_NAME STREQUAL "SunOS" OR
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CMAKE_SYSTEM_NAME STREQUAL "Haiku" OR
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CMAKE_SYSTEM_NAME STREQUAL "OHOS" OR # OpenHarmony
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CMAKE_SYSTEM_NAME STREQUAL "GNU/kFreeBSD" OR
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# FreeBSD comes with the a.out and ELF flavours but a.out was supported
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# up to v3.x and ELF from v3.x. I cannot imagine someone running CMake
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# on those ancient systems.
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CMAKE_SYSTEM_NAME STREQUAL "FreeBSD")
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set(_soversion_default TRUE)
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else()
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set(_soversion_default FALSE)
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endif()
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option(CURL_LIBCURL_SOVERSION "Enable libcurl SOVERSION" ${_soversion_default})
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option(CURL_LIBCURL_VERSIONED_SYMBOLS "Enable libcurl versioned symbols" OFF)
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if(CURL_LIBCURL_SOVERSION OR CURL_LIBCURL_VERSIONED_SYMBOLS)
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# Get VERSIONCHANGE, VERSIONADD, VERSIONDEL, VERSIONINFO variables
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curl_transform_makefile_inc("Makefile.soname" "${CMAKE_CURRENT_BINARY_DIR}/Makefile.soname.cmake")
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include("${CMAKE_CURRENT_BINARY_DIR}/Makefile.soname.cmake")
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math(EXPR _cmakesoname "${VERSIONCHANGE} - ${VERSIONDEL}")
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set(_cmakeversion "${_cmakesoname}.${VERSIONDEL}.${VERSIONADD}")
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endif()
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if(CURL_LIBCURL_SOVERSION)
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set_target_properties(${LIB_SHARED} PROPERTIES
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VERSION "${_cmakeversion}" SOVERSION "${_cmakesoname}")
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endif()
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## Versioned symbols
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if(CURL_LIBCURL_VERSIONED_SYMBOLS)
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if(NOT DEFINED CURL_LIBCURL_VERSIONED_SYMBOLS_PREFIX)
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# Default to prefixes used by autotools
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if(CURL_WITH_MULTI_SSL)
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set(CURL_LIBCURL_VERSIONED_SYMBOLS_PREFIX "MULTISSL_")
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elseif(CURL_USE_OPENSSL)
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set(CURL_LIBCURL_VERSIONED_SYMBOLS_PREFIX "OPENSSL_")
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elseif(CURL_USE_MBEDTLS)
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set(CURL_LIBCURL_VERSIONED_SYMBOLS_PREFIX "MBEDTLS_")
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elseif(CURL_USE_WOLFSSL)
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set(CURL_LIBCURL_VERSIONED_SYMBOLS_PREFIX "WOLFSSL_")
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elseif(CURL_USE_GNUTLS)
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set(CURL_LIBCURL_VERSIONED_SYMBOLS_PREFIX "GNUTLS_")
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elseif(CURL_USE_RUSTLS)
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set(CURL_LIBCURL_VERSIONED_SYMBOLS_PREFIX "RUSTLS_")
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endif()
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endif()
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# Generate version script for the linker, for versioned symbols.
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# Consumed variables:
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# CURL_LIBCURL_VERSIONED_SYMBOLS_PREFIX
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# CURL_LIBCURL_VERSIONED_SYMBOLS_SONAME
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set(CURL_LIBCURL_VERSIONED_SYMBOLS_SONAME ${_cmakesoname})
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configure_file(
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"${CMAKE_CURRENT_SOURCE_DIR}/libcurl.vers.in"
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"${CMAKE_CURRENT_BINARY_DIR}/libcurl.vers" @ONLY)
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include(CMakePushCheckState)
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include(CheckCSourceCompiles)
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cmake_push_check_state()
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set(CMAKE_REQUIRED_LINK_OPTIONS "-Wl,--version-script=${CMAKE_CURRENT_BINARY_DIR}/libcurl.vers")
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check_c_source_compiles("int main(void) { return 0; }" HAVE_VERSIONED_SYMBOLS)
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if(HAVE_VERSIONED_SYMBOLS)
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if(CMAKE_VERSION VERSION_GREATER_EQUAL 3.13)
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set_property(TARGET ${LIB_SHARED} APPEND PROPERTY LINK_OPTIONS "${CMAKE_REQUIRED_LINK_OPTIONS}")
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else()
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set_property(TARGET ${LIB_SHARED} APPEND PROPERTY LINK_FLAGS "${CMAKE_REQUIRED_LINK_OPTIONS}")
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endif()
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else()
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message(WARNING "Versioned symbols requested, but not supported by the toolchain.")
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endif()
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cmake_pop_check_state()
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endif()
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endif()
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add_library(${LIB_NAME} ALIAS ${LIB_SELECTED})
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add_library(${PROJECT_NAME}::${LIB_NAME} ALIAS ${LIB_SELECTED})
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if(CURL_ENABLE_EXPORT_TARGET)
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if(NOT CURL_DISABLE_INSTALL AND BUILD_STATIC_LIBS)
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install(TARGETS ${LIB_STATIC}
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EXPORT ${TARGETS_EXPORT_NAME}
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ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
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LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
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RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
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)
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endif()
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if(NOT CURL_DISABLE_INSTALL AND BUILD_SHARED_LIBS)
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install(TARGETS ${LIB_SHARED}
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EXPORT ${TARGETS_EXPORT_NAME}
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ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
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LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
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RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
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)
|
|
endif()
|
|
|
|
export(TARGETS ${libcurl_export}
|
|
FILE "${PROJECT_BINARY_DIR}/libcurl-target.cmake"
|
|
NAMESPACE ${PROJECT_NAME}::
|
|
)
|
|
endif()
|
|
|
|
if(PERL_EXECUTABLE)
|
|
add_custom_target(curl-optiontable
|
|
COMMENT "Generating lib/easyoptions.c" VERBATIM USES_TERMINAL
|
|
COMMAND "${PERL_EXECUTABLE}" "${CMAKE_CURRENT_SOURCE_DIR}/optiontable.pl" < "${PROJECT_SOURCE_DIR}/include/curl/curl.h"
|
|
> "${PROJECT_SOURCE_DIR}/lib/easyoptions.c"
|
|
DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/optiontable.pl" "${PROJECT_SOURCE_DIR}/include/curl/curl.h"
|
|
)
|
|
endif()
|