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66ad54e46b

Viktor Szakats
Viktor Szakats
2026-01-22
SUCCESS Duration: 314s

Subject

cmake: add `CURL_DROP_UNUSED` option to reduce binary sizes

Binary

No binary (build failed)

Architecture & Compiler Flags

Architecture: x86_64-linux-gnu Compiler: gcc (Ubuntu 11.4.0-1ubuntu1~22.04.3) 11.4.0

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Build Log

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Commit Diff GitHub →

.github/workflows/http3-linux.yml +1 -1.github/workflows/linux.yml +2 -2.github/workflows/macos.yml +3 -3.github/workflows/windows.yml +4 -2CMakeLists.txt +34 -0appveyor.sh +1 -0docs/INSTALL-CMAKE.md +1 -0lib/CMakeLists.txt +3 -0src/CMakeLists.txt +1 -0
.github/workflows/http3-linux.yml+1 -1
@@ -389,7 +389,7 @@ jobs:
tflags: '--min=1790'
generate: >-
-DOPENSSL_ROOT_DIR=/home/runner/awslc/build -DUSE_NGTCP2=ON -DBUILD_SHARED_LIBS=OFF
- -DCMAKE_UNITY_BUILD=ON
+ -DCMAKE_UNITY_BUILD=ON -DCURL_DROP_UNUSED=ON
- name: 'boringssl'
install_steps: skipall
.github/workflows/linux.yml+2 -2
@@ -121,7 +121,7 @@ jobs:
tflags: '--min=830 1 to 950'
LDFLAGS: -Wl,-rpath,/home/runner/mbedtls/lib
PKG_CONFIG_PATH: /home/runner/mbedtls/lib/pkgconfig
- generate: -DCURL_USE_MBEDTLS=ON -DENABLE_DEBUG=ON -DCURL_USE_GSSAPI=ON
+ generate: -DCURL_USE_MBEDTLS=ON -DENABLE_DEBUG=ON -DCURL_USE_GSSAPI=ON -DCURL_DROP_UNUSED=ON
- name: 'mbedtls gss valgrind 2'
install_packages: libnghttp2-dev libidn2-dev libldap-dev libgss-dev valgrind
@@ -163,7 +163,7 @@ jobs:
- name: 'awslc'
install_packages: libidn2-dev
install_steps: awslc
- generate: -DOPENSSL_ROOT_DIR=/home/runner/awslc -DUSE_ECH=ON -DCMAKE_UNITY_BUILD=OFF
+ generate: -DOPENSSL_ROOT_DIR=/home/runner/awslc -DUSE_ECH=ON -DCMAKE_UNITY_BUILD=OFF -DCURL_DROP_UNUSED=ON
- name: 'boringssl'
install_steps: boringssl pytest
.github/workflows/macos.yml+3 -3
@@ -151,7 +151,7 @@ jobs:
# https://cmake.org/cmake/help/latest/manual/cmake-toolchains.7.html#cross-compiling-for-ios-tvos-visionos-or-watchos
[ -n "${MATRIX_GENERATOR}" ] && options="-G ${MATRIX_GENERATOR}"
cmake -B bld -G Ninja -D_CURL_PREFILL=ON \
- -DCMAKE_UNITY_BUILD=ON -DCURL_WERROR=ON \
+ -DCMAKE_UNITY_BUILD=ON -DCURL_DROP_UNUSED=ON -DCURL_WERROR=ON \
-DCMAKE_SYSTEM_NAME=iOS \
-DUSE_APPLE_IDN=ON \
${MATRIX_GENERATE} ${options}
@@ -417,7 +417,7 @@ jobs:
[ "${_chkprefill}" = '_chkprefill' ] && options+=' -D_CURL_PREFILL=OFF'
cmake -B "bld${_chkprefill}" -G Ninja -D_CURL_PREFILL=ON \
-DCMAKE_INSTALL_PREFIX="$HOME"/curl-install \
- -DCMAKE_UNITY_BUILD=ON -DCURL_WERROR=ON \
+ -DCMAKE_UNITY_BUILD=ON -DCURL_DROP_UNUSED=ON -DCURL_WERROR=ON \
-DCMAKE_OSX_SYSROOT="${sysroot}" \
-DCMAKE_C_COMPILER_TARGET="$(uname -m | sed 's/arm64/aarch64e/')-apple-darwin$(uname -r)" \
${MATRIX_GENERATE} ${options}
@@ -652,7 +652,7 @@ jobs:
[ -n "${MATRIX_MACOS_VERSION_MIN}" ] && options+=" -DCMAKE_OSX_DEPLOYMENT_TARGET=${MATRIX_MACOS_VERSION_MIN}"
# would pick up nghttp2, libidn2, and libssh2
cmake -B bld -G Ninja -D_CURL_PREFILL=ON \
- -DCMAKE_UNITY_BUILD=ON -DCURL_WERROR=ON \
+ -DCMAKE_UNITY_BUILD=ON -DCURL_DROP_UNUSED=ON -DCURL_WERROR=ON \
-DCMAKE_OSX_SYSROOT="${sysroot}" \
-DCMAKE_C_COMPILER_TARGET="$(uname -m | sed 's/arm64/aarch64e/')-apple-darwin$(uname -r)" \
-DCMAKE_IGNORE_PREFIX_PATH=/opt/homebrew \
.github/workflows/windows.yml+4 -2
@@ -204,7 +204,7 @@ jobs:
# MinGW
- { build: 'autotools', sys: 'mingw64' , env: 'x86_64' , tflags: 'skiprun' , config: '--enable-debug --with-openssl --disable-threaded-resolver --enable-static --without-zlib', install: 'mingw-w64-x86_64-openssl mingw-w64-x86_64-libssh2', name: 'default' }
- { build: 'autotools', sys: 'mingw64' , env: 'x86_64' , tflags: '' , config: '--enable-debug --with-openssl --enable-windows-unicode --enable-ares --enable-static --disable-shared --enable-ca-native', install: 'mingw-w64-x86_64-c-ares mingw-w64-x86_64-openssl mingw-w64-x86_64-nghttp3 mingw-w64-x86_64-libssh2', name: 'c-ares U' }
- - { build: 'cmake' , sys: 'mingw64' , env: 'x86_64' , tflags: '--min=1650', config: '-DENABLE_DEBUG=ON -DBUILD_SHARED_LIBS=OFF -DCURL_USE_SCHANNEL=ON -DENABLE_UNICODE=ON -DENABLE_ARES=ON', install: 'mingw-w64-x86_64-c-ares mingw-w64-x86_64-libssh2', type: 'Debug', name: 'schannel c-ares U' }
+ - { build: 'cmake' , sys: 'mingw64' , env: 'x86_64' , tflags: '--min=1650', config: '-DENABLE_DEBUG=ON -DBUILD_SHARED_LIBS=OFF -DCURL_USE_SCHANNEL=ON -DENABLE_UNICODE=ON -DENABLE_ARES=ON -DCURL_DROP_UNUSED=ON', install: 'mingw-w64-x86_64-c-ares mingw-w64-x86_64-libssh2', type: 'Debug', name: 'schannel c-ares U' }
# MinGW torture
- { build: 'cmake' , sys: 'mingw64' , env: 'x86_64' , tflags: '-t --shallow=13 --min=700 1 to 950' , config: '-DENABLE_DEBUG=ON -DBUILD_SHARED_LIBS=OFF -DCURL_USE_SCHANNEL=ON -DENABLE_UNICODE=ON -DENABLE_ARES=ON', install: 'mingw-w64-x86_64-c-ares mingw-w64-x86_64-libssh2', type: 'Debug', name: 'schannel U torture 1' }
- { build: 'cmake' , sys: 'mingw64' , env: 'x86_64' , tflags: '-t --shallow=13 --min=700 951 to 9999', config: '-DENABLE_DEBUG=ON -DBUILD_SHARED_LIBS=OFF -DCURL_USE_SCHANNEL=ON -DENABLE_UNICODE=ON -DENABLE_ARES=ON', install: 'mingw-w64-x86_64-c-ares mingw-w64-x86_64-libssh2', type: 'Debug', name: 'schannel U torture 2' }
@@ -213,7 +213,7 @@ jobs:
# Windows. Do not use this component till there is a fix for these.
# https://github.com/curl/curl-for-win/blob/3951808deb04df9489ee17430f236ed54436f81a/libssh.sh#L6-L8
- { build: 'cmake' , sys: 'clang64' , env: 'clang-x86_64' , tflags: '' , config: '-DENABLE_DEBUG=ON -DBUILD_SHARED_LIBS=OFF -DCURL_USE_GNUTLS=ON -DENABLE_UNICODE=OFF -DUSE_NGTCP2=ON -DCURL_USE_LIBSSH2=OFF -DCURL_USE_LIBSSH=ON', install: 'mingw-w64-clang-x86_64-gnutls mingw-w64-clang-x86_64-nghttp3 mingw-w64-clang-x86_64-ngtcp2 mingw-w64-clang-x86_64-libssh', type: 'Debug', name: 'gnutls libssh' }
- - { build: 'cmake' , sys: 'clangarm64', env: 'clang-aarch64', tflags: 'skiprun' , config: '-DENABLE_DEBUG=OFF -DBUILD_SHARED_LIBS=ON -DCURL_USE_SCHANNEL=ON -DENABLE_UNICODE=ON', install: 'mingw-w64-clang-aarch64-libssh2', type: 'Release', name: 'schannel R', image: 'windows-11-arm' }
+ - { build: 'cmake' , sys: 'clangarm64', env: 'clang-aarch64', tflags: 'skiprun' , config: '-DENABLE_DEBUG=OFF -DBUILD_SHARED_LIBS=ON -DCURL_USE_SCHANNEL=ON -DENABLE_UNICODE=ON -DCURL_DROP_UNUSED=ON', install: 'mingw-w64-clang-aarch64-libssh2', type: 'Release', name: 'schannel R', image: 'windows-11-arm' }
- { build: 'cmake' , sys: 'clang64' , env: 'clang-x86_64' , tflags: 'skiprun' , config: '-DENABLE_DEBUG=ON -DBUILD_SHARED_LIBS=OFF -DCURL_USE_OPENSSL=ON -DENABLE_UNICODE=OFF -DUSE_NGTCP2=ON', install: 'mingw-w64-clang-x86_64-openssl mingw-w64-clang-x86_64-nghttp3 mingw-w64-clang-x86_64-ngtcp2 mingw-w64-clang-x86_64-libssh2', type: 'Release', name: 'openssl', chkprefill: '_chkprefill' }
- { build: 'cmake' , sys: 'ucrt64' , env: 'ucrt-x86_64' , tflags: 'skiprun' , config: '-DENABLE_DEBUG=OFF -DBUILD_SHARED_LIBS=ON -DCURL_USE_OPENSSL=ON', install: 'mingw-w64-ucrt-x86_64-openssl mingw-w64-ucrt-x86_64-libssh2', type: 'Release', test: 'uwp', name: 'schannel' }
# { build: 'autotools', sys: 'ucrt64' , env: 'ucrt-x86_64' , tflags: 'skiprun' , config: '--without-debug --with-schannel --disable-static', install: 'mingw-w64-ucrt-x86_64-libssh2', type: 'Release', test: 'uwp', name: 'schannel' }
@@ -528,6 +528,7 @@ jobs:
-DCMAKE_C_COMPILER=gcc \
-DCMAKE_BUILD_TYPE="${MATRIX_TYPE}" \
-DCMAKE_UNITY_BUILD=ON -DCMAKE_UNITY_BUILD_BATCH_SIZE=30 \
+ -DCURL_DROP_UNUSED=ON \
-DCURL_WERROR=ON \
-DUSE_LIBIDN2=OFF \
${MATRIX_CONFIG}
@@ -891,6 +892,7 @@ jobs:
-DCMAKE_EXE_LINKER_FLAGS="-INCREMENTAL:NO ${ldflags}" \
-DCMAKE_SHARED_LINKER_FLAGS="-INCREMENTAL:NO ${ldflags}" \
-DCMAKE_UNITY_BUILD=ON \
+ -DCURL_DROP_UNUSED=ON \
-DCURL_WERROR=ON \
-DLIBPSL_INCLUDE_DIR="${MINGW_PREFIX}/include" \
-DLIBPSL_LIBRARY="${MINGW_PREFIX}/lib/libpsl.dll.a" \
CMakeLists.txt+34 -0
@@ -300,6 +300,40 @@ if(CURL_CODE_COVERAGE)
endif()
endif()
+set(CURL_CFLAGS "") # C flags set for libcurl and curl tool (aka public binaries) only
+
+option(CURL_DROP_UNUSED "Drop unused code and data from built binaries" OFF)
+if(CURL_DROP_UNUSED OR TRUE)
+ if(APPLE)
+ if(CMAKE_VERSION VERSION_GREATER_EQUAL 3.13)
+ set_property(DIRECTORY APPEND PROPERTY LINK_OPTIONS "-Wl,-dead_strip")
+ else()
+ set_property(DIRECTORY APPEND PROPERTY LINK_FLAGS "-Wl,-dead_strip")
+ endif()
+ elseif(MSVC) # Options below are toolchain defaults in Release configurations.
+ # This option does not seem to have an effect with VS2010:
+ if(CMAKE_VERSION VERSION_GREATER_EQUAL 3.13)
+ set_property(DIRECTORY APPEND PROPERTY LINK_OPTIONS "-OPT:REF")
+ else()
+ set_property(DIRECTORY APPEND PROPERTY LINK_FLAGS "-OPT:REF")
+ endif()
+ # Optional, but reduces binary size further, with the cost of larger objects/static libraries:
+ list(APPEND CURL_CFLAGS "-Gy")
+ elseif(CMAKE_C_COMPILER_ID STREQUAL "GNU" OR CMAKE_C_COMPILER_ID MATCHES "Clang")
+ if(WIN32)
+ # To make -Wl,--gc-sections work on Windows: https://sourceware.org/bugzilla/show_bug.cgi?id=11539
+ set_property(DIRECTORY APPEND PROPERTY COMPILE_OPTIONS "-fno-asynchronous-unwind-tables")
+ endif()
+ if(CMAKE_VERSION VERSION_GREATER_EQUAL 3.13)
+ set_property(DIRECTORY APPEND PROPERTY LINK_OPTIONS "-Wl,--gc-sections")
+ else()
+ set_property(DIRECTORY APPEND PROPERTY LINK_FLAGS "-Wl,--gc-sections")
+ endif()
+ # Optional, but reduces binary size further, with the cost of larger objects/static libraries:
+ list(APPEND CURL_CFLAGS "-ffunction-sections" "-fdata-sections")
+ endif()
+endif()
+
# For debug libs and exes, add "-d" postfix
if(NOT DEFINED CMAKE_DEBUG_POSTFIX)
set(CMAKE_DEBUG_POSTFIX "-d")
appveyor.sh+1 -0
@@ -87,6 +87,7 @@ if [ -n "${CMAKE_GENERATOR:-}" ]; then
time cmake -G "${CMAKE_GENERATOR}" \
-DENABLE_DEBUG=ON -DCURL_WERROR=ON \
-DCURL_STATIC_CRT=ON \
+ -DCURL_DROP_UNUSED=ON \
-DCURL_USE_SCHANNEL=ON -DCURL_USE_LIBPSL=OFF \
${CMAKE_GENERATE:-} \
${options} \
docs/INSTALL-CMAKE.md+1 -0
@@ -243,6 +243,7 @@ target_link_libraries(my_target PRIVATE CURL::libcurl)
- `CURL_LIBCURL_VERSIONED_SYMBOLS_PREFIX`: Override default versioned symbol prefix. Default: `<TLS-BACKEND>_` or `MULTISSL_`
- `CURL_LINT`: Run lint checks while building. Default: `OFF`
- `CURL_LTO`: Enable compiler Link Time Optimizations. Default: `OFF`
+- `CURL_DROP_UNUSED`: Drop unused code and data from built binaries. Default: `OFF`
- `CURL_STATIC_CRT`: Build libcurl with static CRT with MSVC (`/MT`) (requires UCRT, static libcurl or no curl executable). Default: `OFF`
- `CURL_TARGET_WINDOWS_VERSION`: Minimum target Windows version as hex string.
- `CURL_WERROR`: Turn compiler warnings into errors. Default: `OFF`
lib/CMakeLists.txt+3 -0
@@ -111,6 +111,7 @@ if(SHARE_LIB_OBJECT AND CMAKE_VERSION VERSION_GREATER_EQUAL 3.12)
target_link_libraries(${LIB_OBJECT} PRIVATE ${CURL_LIBS})
set_target_properties(${LIB_OBJECT} PROPERTIES
POSITION_INDEPENDENT_CODE ON)
+ set_property(TARGET ${LIB_OBJECT} APPEND PROPERTY COMPILE_OPTIONS "${CURL_CFLAGS}")
if(CURL_HIDES_PRIVATE_SYMBOLS)
set_property(TARGET ${LIB_OBJECT} APPEND PROPERTY COMPILE_OPTIONS "${CURL_CFLAG_SYMBOLS_HIDE}")
set_property(TARGET ${LIB_OBJECT} APPEND PROPERTY COMPILE_DEFINITIONS "CURL_HIDDEN_SYMBOLS")
@@ -152,6 +153,7 @@ if(BUILD_STATIC_LIBS)
PREFIX "" OUTPUT_NAME "${LIBCURL_OUTPUT_NAME}"
SUFFIX "${STATIC_LIB_SUFFIX}${CMAKE_STATIC_LIBRARY_SUFFIX}"
INTERFACE_COMPILE_DEFINITIONS "CURL_STATICLIB")
+ set_property(TARGET ${LIB_STATIC} APPEND PROPERTY COMPILE_OPTIONS "${CURL_CFLAGS}")
if(CURL_HIDES_PRIVATE_SYMBOLS)
set_property(TARGET ${LIB_STATIC} APPEND PROPERTY COMPILE_OPTIONS "${CURL_CFLAG_SYMBOLS_HIDE}")
set_property(TARGET ${LIB_STATIC} APPEND PROPERTY COMPILE_DEFINITIONS "CURL_HIDDEN_SYMBOLS")
@@ -213,6 +215,7 @@ if(BUILD_SHARED_LIBS)
PREFIX "" OUTPUT_NAME "${LIBCURL_OUTPUT_NAME}"
IMPORT_PREFIX "" IMPORT_SUFFIX "${IMPORT_LIB_SUFFIX}${CMAKE_IMPORT_LIBRARY_SUFFIX}"
POSITION_INDEPENDENT_CODE ON)
+ set_property(TARGET ${LIB_SHARED} APPEND PROPERTY COMPILE_OPTIONS "${CURL_CFLAGS}")
if(CURL_HIDES_PRIVATE_SYMBOLS)
set_property(TARGET ${LIB_SHARED} APPEND PROPERTY COMPILE_OPTIONS "${CURL_CFLAG_SYMBOLS_HIDE}")
set_property(TARGET ${LIB_SHARED} APPEND PROPERTY COMPILE_DEFINITIONS "CURL_HIDDEN_SYMBOLS")
src/CMakeLists.txt+1 -0
@@ -105,6 +105,7 @@ set_property(DIRECTORY APPEND PROPERTY INCLUDE_DIRECTORIES
add_executable(${EXE_NAME} ${CURL_CFILES} ${CURL_HFILES} ${_curl_cfiles_gen} ${_curl_hfiles_gen} ${CURLX_CFILES} ${CURLX_HFILES})
target_compile_definitions(${EXE_NAME} PRIVATE ${_curl_definitions})
target_link_libraries(${EXE_NAME} ${LIB_SELECTED_FOR_EXE} ${CURL_LIBS})
+set_property(TARGET ${EXE_NAME} APPEND PROPERTY COMPILE_OPTIONS "${CURL_CFLAGS}")
add_executable(${PROJECT_NAME}::${EXE_NAME} ALIAS ${EXE_NAME})