cmake: Fix aom linkage race condition on MSVC
This commit fixes the linkers for both aom and aom_static writing the
export libraries to the same file on MSVC.
The fix also changes test_libaom, test_intra_pred_speed, and
lightfield_decoder to link against static aom because they rely
(undocumentedly, except for test_intra_pred_speed) on unexported AV1
functions.
Also allows to deduplicate AOM_SOURCES except on Xcode, which does not
support build targets made wholly of objects [1].
[1]: https://gitlab.kitware.com/cmake/cmake/-/issues/17500
BUG: aomedia:3401
Change-Id: Iedd97d6ac081872fe0093934345df05abe822273
diff --git a/CMakeLists.txt b/CMakeLists.txt
index dcaf7ce..f345bcd 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -273,11 +273,34 @@
set(AOM_LIB_TARGETS ${AOM_LIB_TARGETS} aom_encoder_stats)
endif()
-add_library(aom ${AOM_SOURCES} $<TARGET_OBJECTS:aom_rtcd>)
-if(BUILD_SHARED_LIBS)
- add_library(aom_static STATIC ${AOM_SOURCES} $<TARGET_OBJECTS:aom_rtcd>)
- set_target_properties(aom_static PROPERTIES OUTPUT_NAME aom)
+# Xcode generator cannot take a library composed solely of objects. See
+# https://gitlab.kitware.com/cmake/cmake/-/issues/17500
+if(XCODE)
+ set(target_objs_aom ${AOM_SOURCES})
+else()
+ add_library(aom_obj OBJECT ${AOM_SOURCES})
+ set(AOM_LIB_TARGETS ${AOM_LIB_TARGETS} aom_obj)
+ set(target_objs_aom $<TARGET_OBJECTS:aom_obj>)
+endif()
+add_library(aom ${target_objs_aom} $<TARGET_OBJECTS:aom_rtcd>)
+if(BUILD_SHARED_LIBS)
+ add_library(aom_static STATIC ${target_objs_aom} $<TARGET_OBJECTS:aom_rtcd>)
+ if(MSVC OR (WIN32 AND NOT MINGW))
+ # Fix race condition on the export library file between the two versions.
+ # Affects MSVC in all three flavors (stock, Clang/CL, LLVM-- the latter sets
+ # MSVC and MINGW both to FALSE).
+ set_target_properties(aom PROPERTIES ARCHIVE_OUTPUT_NAME "aom_shared")
+ endif()
+ # Tests and examples rely on having unexported AV1 symbols visible. This is
+ # not the case on Windows platforms due to enforcement of the module
+ # definition file.
+ set(AOM_LIB aom_static)
+else()
+ set(AOM_LIB aom)
+endif()
+
+if(BUILD_SHARED_LIBS)
if(NOT MSVC)
# Extract version string and set VERSION/SOVERSION for the aom target.
extract_version_string("${AOM_CONFIG_DIR}/config/aom_version.h"
@@ -339,9 +362,9 @@
setup_av1_targets()
# Make all library targets depend on aom_rtcd to make sure it builds first.
-foreach(aom_lib ${AOM_LIB_TARGETS})
- if(NOT "${aom_lib}" STREQUAL "aom_rtcd")
- add_dependencies(${aom_lib} aom_rtcd)
+foreach(aom_tgt ${AOM_LIB_TARGETS})
+ if(NOT "${aom_tgt}" STREQUAL "aom_rtcd")
+ add_dependencies(${aom_tgt} aom_rtcd)
endif()
endforeach()
@@ -713,7 +736,7 @@
endif()
foreach(aom_app ${AOM_APP_TARGETS})
- target_link_libraries(${aom_app} ${AOM_LIB_LINK_TYPE} aom)
+ target_link_libraries(${aom_app} ${AOM_LIB_LINK_TYPE} ${AOM_LIB})
endforeach()
if(ENABLE_EXAMPLES OR ENABLE_TESTS OR ENABLE_TOOLS)
