`cargo build` fails in latest macOS due to removed macro `_LIBCPP_ENABLE_ASSERTIONS`

[ibc]

I updated my Xcode Command Line Tools or whatver and now I cannot build mediasoup Rust. cargo build fails as follows:

Found ninja-1.10.2.git.kitware.jobserver-1 at /Volumes/src-cs/mediasoup/target/debug/build/mediasoup-sys-a3e37132768c4096/out/out/pip_meson_ninja/bin/ninja
  [1/49] Compiling C++ object subprojects/flatbuffers-24.3.25/libswift_generator.a.p/grpc_src_compiler_swift_generator.cc.o
  FAILED: subprojects/flatbuffers-24.3.25/libswift_generator.a.p/grpc_src_compiler_swift_generator.cc.o 
  c++ -Isubprojects/flatbuffers-24.3.25/libswift_generator.a.p -Isubprojects/flatbuffers-24.3.25 -I../../../../../../worker/subprojects/flatbuffers-24.3.25 -I../../../../../../worker/subprojects/flatbuffers-24.3.25/include -I../../../../../../worker/subprojects/flatbuffers-24.3.25/grpc -fdiagnostics-color=always -D_LIBCPP_ENABLE_ASSERTIONS=1 -std=c++17 -O0 -g -DFLATBUFFERS_LOCALE_INDEPENDENT=true -fsigned-char -MD -MQ subprojects/flatbuffers-24.3.25/libswift_generator.a.p/grpc_src_compiler_swift_generator.cc.o -MF subprojects/flatbuffers-24.3.25/libswift_generator.a.p/grpc_src_compiler_swift_generator.cc.o.d -o subprojects/flatbuffers-24.3.25/libswift_generator.a.p/grpc_src_compiler_swift_generator.cc.o -c ../../../../../../worker/subprojects/flatbuffers-24.3.25/grpc/src/compiler/swift_generator.cc
  In file included from ../../../../../../worker/subprojects/flatbuffers-24.3.25/grpc/src/compiler/swift_generator.cc:23:
  In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/c++/v1/map:577:
  In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/c++/v1/__algorithm/equal.h:13:
  In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/c++/v1/__algorithm/comp.h:12:
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/c++/v1/__config:49:6: error: "_LIBCPP_ENABLE_ASSERTIONS has been removed, please use _LIBCPP_HARDENING_MODE instead"
     49 | #    error "_LIBCPP_ENABLE_ASSERTIONS has been removed, please use _LIBCPP_HARDENING_MODE instead"
        |      ^
  1 error generated.
  [2/49] Compiling C++ object subprojects/flatbuffers-24.3.25/libpython_generator.a.p/grpc_src_compiler_python_generator.cc.o

• macOS: 15.6.1 (ARM M4)
• Xcode: 26.0.1
• MacOSX26.0.sdk

[nazar-pc]

-D_LIBCPP_ENABLE_ASSERTIONS=1 is an argument to flatbuffers compilation, maybe there is a newer release of it that fixes compilation issue? The compiler error is quite clear.

[ibc]

-D_LIBCPP_ENABLE_ASSERTIONS=1 is an argument to flatbuffers compilation, maybe there is a newer release of it that fixes compilation issue? The compiler error is quite clear.

This is due to the new MacOSX26 SDK which no longer supports _LIBCPP_ENABLE_ASSERTIONS. There is no newer flatbuffer version in Meson WrapDB:

• Latest flatbuffer version in Meson WrapDB (the one we use in mediasoup): 24.3.25-1
• Latest flatbuffer version in GH releases: v25.9.23

Note: No idea if the latest release would fix this problem, I've checked it.

[nazar-pc]

You can submit the PR to fix that or I believe there is a way to apply a patch to a Meson wrap downstream as well (don't recall off top of my head how exactly though).

[ibc]

What the hell? There is no LIBCPP_ENABLE_ASSERTIONS at all in worker/subprojects (after compiling the worker using make so all subprojects have been downloaded):

ack LIBCPP_ENABLE_ASSERTIONS
// => nothing!

[ibc]

Oh, this is Meson fault!

• macOS: Use _LIBCPP_HARDENING_MODE instead of _LIBCPP_ENABLE_ASSERTIONS harfbuzz/harfbuzz#5596
• clang 17 warnings: _LIBCPP_ENABLE_ASSERTIONS is deprecated mesonbuild/meson#14440

[nazar-pc]

Looks like time to upgrade Meson version to at least 1.8.4, tasks.py currently has 1.5.0 configured, which is much older

[ibc]

Looks like time to upgrade Meson version to at least 1.8.4, tasks.py currently has 1.5.0 configured, which is much older

I'm upgrading it to 1.9.1: #1634