support cmake LINK_LIBRARY:WHOLE_ARCHIVE

.circleci/config.yml

@@ -799,6 +799,7 @@ jobs:
       EMTEST_SKIP_NODE_CANARY: "1"
       EMTEST_SKIP_RUST: "1"
       EMTEST_SKIP_WASM64: "1"
+      EMTEST_SKIP_NEW_CMAKE: "1"
     steps:
       - install-rust
       - run: apt-get install -q -y ninja-build scons ccache

cmake/Modules/Platform/Emscripten.cmake

@@ -279,6 +279,10 @@ set(CMAKE_CXX_USE_RESPONSE_FILE_FOR_INCLUDES 1)
 set(CMAKE_C_RESPONSE_FILE_LINK_FLAG "@")
 set(CMAKE_CXX_RESPONSE_FILE_LINK_FLAG "@")
 
+# Enable $<LINK_LIBRARY:WHOLE_ARCHIVE,static_lib> for CMake 3.24+
+set(CMAKE_LINK_LIBRARY_USING_WHOLE_ARCHIVE "-Wl,--whole-archive" "<LINK_ITEM>" "-Wl,--no-whole-archive")
+set(CMAKE_LINK_LIBRARY_USING_WHOLE_ARCHIVE_SUPPORTED True)
+
 # Set a global EMSCRIPTEN variable that can be used in client CMakeLists.txt to
 # detect when building using Emscripten.
 set(EMSCRIPTEN 1 CACHE INTERNAL "If true, we are targeting Emscripten output.")

test/cmake/whole_archive/CMakeLists.txt

@@ -0,0 +1,7 @@
+cmake_minimum_required(VERSION 3.24)
+
+project(whole)
+
+add_library(whole_lib STATIC lib.c)
+add_executable(whole main.c)
+target_link_libraries(whole $<LINK_LIBRARY:WHOLE_ARCHIVE,whole_lib>)

test/cmake/whole_archive/lib.c

@@ -0,0 +1,5 @@
+#include <stdio.h>
+
+__attribute__((constructor)) void init(void) {
+  printf("init\n");
+}

test/cmake/whole_archive/main.c

@@ -0,0 +1,5 @@
+#include <stdio.h>
+
+int main() {
+  printf("main\n");
+}

test/cmake/whole_archive/out.txt

@@ -0,0 +1,2 @@
+init
+main

test/test_other.py

@@ -913,14 +913,18 @@ def test_emstrip(self):
     # would take 10 minutes+ to finish (CMake feature detection is slow), so
     # combine multiple features into one to try to cover as much as possible
     # while still keeping this test in sensible time limit.
-    'js':          ('target_js',      'test_cmake.js',         ['-DCMAKE_BUILD_TYPE=Debug']),
-    'html':        ('target_html',    'hello_world_gles.html', ['-DCMAKE_BUILD_TYPE=Release']),
-    'library':     ('target_library', 'libtest_cmake.a',       ['-DCMAKE_BUILD_TYPE=MinSizeRel']),
-    'static_cpp':  ('target_library', 'libtest_cmake.a',       ['-DCMAKE_BUILD_TYPE=RelWithDebInfo', '-DCPP_LIBRARY_TYPE=STATIC']),
-    'stdproperty': ('stdproperty',    'helloworld.js',         []),
-    'post_build':  ('post_build',     'hello.js',              []),
+    'js':            ('target_js',      'test_cmake.js',         ['-DCMAKE_BUILD_TYPE=Debug']),
+    'html':          ('target_html',    'hello_world_gles.html', ['-DCMAKE_BUILD_TYPE=Release']),
+    'library':       ('target_library', 'libtest_cmake.a',       ['-DCMAKE_BUILD_TYPE=MinSizeRel']),
+    'static_cpp':    ('target_library', 'libtest_cmake.a',       ['-DCMAKE_BUILD_TYPE=RelWithDebInfo', '-DCPP_LIBRARY_TYPE=STATIC']),
+    'whole_archive': ('whole_archive',  'whole.js',              []),
+    'stdproperty':   ('stdproperty',    'helloworld.js',         []),
+    'post_build':    ('post_build',     'hello.js',              []),
   })
   def test_cmake(self, test_dir, output_file, cmake_args):
+    if test_dir == 'whole_archive' and 'EMTEST_SKIP_NEW_CMAKE' in os.environ:
+      self.skipTest('EMTEST_SKIP_NEW_CMAKE set')
+
     # Test all supported generators.
     if WINDOWS:
       generators = ['MinGW Makefiles', 'NMake Makefiles']