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disables lto for only the lib-ffmpeg-support, without affecting the rest of the
build. lib-ffmpeg-support has a large number of -Wodr violations due to it
overloading dynmically imported function/struct names for different ffmpeg
versions, with different declarations. the actual types get resolved at runtime
but cause violations at building with LTO.
there is a fix in progress upstream, which should resolve the issue in future
versions: https://codeberg.org/tenacityteam/tenacity/pulls/418
was reported in bug #961756, other revisions (r2 & r3) will still compile but
this fix is cleaner, has less impact, and stops the problematic code from
compiling with LTO at all.
diff --git a/libraries/lib-ffmpeg-support/CMakeLists.txt b/libraries/lib-ffmpeg-support/CMakeLists.txt
index 7e76ab997..7c1037a60 100644
--- a/libraries/lib-ffmpeg-support/CMakeLists.txt
+++ b/libraries/lib-ffmpeg-support/CMakeLists.txt
@@ -117,6 +117,8 @@ if (USE_FFMPEG)
list(APPEND DEFINITIONS PRIVATE _DARWIN_C_SOURCE )
endif()
+ add_compile_options(-fno-lto)
+ add_link_options(-fno-lto)
tenacity_library( lib-ffmpeg-support "${SOURCES}" "${LIBRARIES}"
"${DEFINITIONS}" ""
)
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