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cmake: optimize building examples in CI

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In CI we want to ensure that examples build cleanly, but we don't want
to actually run them there. Meaning it's enough to just compile, but not
link them in CI. Saving time up to 2-4x (MSVC), and disk space up
to 1.2GB (or 8-70x).

Add a new cmake target that compiles all examples without linking them
into runnable binaries. Keep a full build for a single example to test
if it links correctly.

Also:
- CI: switch over all `curl-examples` targets to `curl-examples-build`
- GHA/linux-old: build examples in one of the cmake builds.

Result highlights:

Job                 | Bef. |  Bef. | Aft. | Aft. |
:------------------ | ---: | ----: | ---: |----: |
cygwin              |  15s |   9MB |  10s |  1MB |
msys                |  13s |   8MB |   7s |  1MB |
dl-mingw 15         |  39s |  113M |  34s |  2MB |
dl-mingw 9.5.0      |  49s | 115MB |  42s |  2MB |
dl-mingw 7.3.0      |  19s | 113MB |  14s |  2MB |
dl-mingw 6.4.0      |   9s |  12MB |   7s |  4MB |
Linux cross         |  19s |  28MB |  19s |  2MB |
MSVC UWP            |  65s | 374MB |   9s | 17MB |
MSVC x64            |  22s | 846MB |   9s | 17MB |
VS2010              |  48s | 105MB |  15s |  9MB |
VS2022 clang-cl     | 195s | 1.2GB |  51s | 20MB |
iOS Xcode           |   8s |       |   5s |      |
macOS LibreSSL      |  16s |       |  11s |      |
Linux aws-lc        |   3s |       |   1s |      |

Follow-up to dda251ef10 #18232

Closes #18209
This commit is contained in:
Viktor Szakats 2025-08-06 22:17:50 +02:00
parent 869506d2da
commit fe5225b5ea
No known key found for this signature in database
GPG key ID: B5ABD165E2AEF201
8 changed files with 51 additions and 18 deletions
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36
docs/examples/CMakeLists.txt
View file

@ -28,10 +28,40 @@ add_custom_target(curl-examples)
curl_transform_makefile_inc("Makefile.inc" "${CMAKE_CURRENT_BINARY_DIR}/Makefile.inc.cmake")
include("${CMAKE_CURRENT_BINARY_DIR}/Makefile.inc.cmake")
foreach(_target IN LISTS check_PROGRAMS)
set(_all_canary "")
set(_all "all")
foreach(_target IN LISTS check_PROGRAMS _all) # keep '_all' last
set(_target_name "curl-example-${_target}")
add_executable(${_target_name} EXCLUDE_FROM_ALL "${_target}.c")
add_dependencies(curl-examples ${_target_name})
if(_target STREQUAL "all")
if(CMAKE_VERSION VERSION_GREATER_EQUAL 3.12)
set(_examples_c "${check_PROGRAMS}")
list(TRANSFORM _examples_c APPEND ".c")
add_library(${_target_name} OBJECT EXCLUDE_FROM_ALL ${_examples_c})
if(MSVC AND NOT CMAKE_C_COMPILER_ID STREQUAL "Clang")
# CMake generates a static library for the OBJECT target. Silence these 'lib.exe' warnings:
# warning LNK4006: main already defined in ....obj; second definition ignored
# warning LNK4221: This object file does not define any previously undefined public symbols,
# so it will not be used by any link operation that consumes this library
if(CMAKE_VERSION VERSION_GREATER_EQUAL 3.13)
set_target_properties(${_target_name} PROPERTIES STATIC_LIBRARY_OPTIONS "-ignore:4006;-ignore:4221")
else()
set_target_properties(${_target_name} PROPERTIES STATIC_LIBRARY_FLAGS "-ignore:4006 -ignore:4221")
endif()
endif()
else()
set(_examples_c "")
foreach(_src IN LISTS check_PROGRAMS)
list(APPEND _examples_c "${_src}.c")
endforeach()
add_library(${_target_name} STATIC EXCLUDE_FROM_ALL ${_examples_c})
endif()
add_custom_target(curl-examples-build) # Special target to compile all tests quickly and build a single test to probe linkage
add_dependencies(curl-examples-build ${_target_name} ${_all_canary}) # Include a full build of a single test
else()
set(_all_canary ${_target_name}) # Save the last test for the curl-examples-build target
add_executable(${_target_name} EXCLUDE_FROM_ALL "${_target}.c")
add_dependencies(curl-examples ${_target_name})
endif()
target_link_libraries(${_target_name} ${LIB_SELECTED} ${CURL_NETWORK_AND_TIME_LIBS})
target_compile_definitions(${_target_name} PRIVATE "CURL_NO_OLDIES"
"$<$<BOOL:${WIN32}>:WIN32_LEAN_AND_MEAN>" "$<$<BOOL:${MSVC}>:_CRT_SECURE_NO_DEPRECATE>")