libs: Add support for latest LLVM LIBCXX and LIBCXXABI version 21.1.8 #17826
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Barto22
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fdcavalcanti,
gustavonihei,
jerpelea,
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raiden00pl,
simbit18,
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Area: Build system
Arch: arm
This commit adds support for LLVM libcxx and libcxxabi version 21.1.8, including necessary patches and CMake configuration for building with NuttX. Signed-off-by: Bartosz <[email protected]>
Fix exception handling issues in libcxx and libcxxabi to work properly with NuttX's exception model. Signed-off-by: Bartosz <[email protected]>
Add necessary changes to support ESP32 RISC-V initialization with proper C++ constructor handling including code style fixes. Signed-off-by: Bartosz <[email protected]>
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This commit adds support for threads using pthread support. Signed-off-by: Bartosz <[email protected]>
jerpelea
changed the title
jerpelea
previously approved these changes
Jan 12, 2026
Remove flag for long-calls for arm architecture. Signed-off-by: Bartosz <[email protected]>
boards/sim/: Change gcc to clang This commit will update Docker file to latest Ubuntu LTS with update of GCC for ARM and RISCV. Also SIM boards with LIBCXX are build with clang because GCC < 15 have lack of some builtin features. Signed-off-by: Bartosz <[email protected]>
Fix cmake formatting. Signed-off-by: Bartosz <[email protected]>
Change mcmodel to large and update bloaty to latest version Signed-off-by: Bartosz <[email protected]>
Fix patches includes in libcxx. Signed-off-by: Bartosz <[email protected]>
Update Clang to version 21. Signed-off-by: Bartosz <[email protected]>
acassis
previously approved these changes
Jan 12, 2026
Fix version of Clang-21 for Ubuntu jammy Signed-off-by: Bartosz <[email protected]>
This was referenced Jan 12, 2026
Contributor
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@Barto22 please move Docker related change to new pr, so we can merge it first and then verify whether this pr can pass ci. |
| ifneq ($(CONFIG_CXX_RTTI),y) | ||
| ARCHCXXFLAGS += -fno-rtti | ||
| endif | ||
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| { | ||
| #if defined(CONFIG_ARCH_SIM) && defined(CONFIG_HOST_MACOS) | ||
| macho_call_saved_init_funcs(); | ||
| #elif defined(USE_ESP32_XTENSA_INIT_ARRAYS) |
Contributor
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why add esp32 specific code in the common place? it's better to adjust esp32 riscv ld to conform the requirement.
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| ARCHPICFLAGS = -fpic | ||
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| ifeq ($(CONFIG_SIM_TOOLCHAIN_CLANG),y) |
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it's better to split the change not directly related to c++23 upgrade to new pr to boost the review proccess.
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Summary
This PR updates the build environment to use the latest Ubuntu 24.04 LTS base image and upgrades the GNU toolchains to:
All SIM board configurations that enable LIBCXX are now built with clang, as GCC < 15 lacks required builtin features for C++23 and libc++.
This continues the integration effort for LLVM libc++ and libc++abi (v21.1.8) in NuttX, enabling modern C++23-compatible standard library components including new language features and exception handling.
Impact
Current status:
makeandcmakeNo impact to existing boards or applications unless enabling libc++.
Testing
Host environment:
Boards / Configurations tested:
stm32f4discovery:testlibcxxesp32c3-devkit:testlibcxxToolchains:
Procedure:
makeandcmakeStatus:
Logs and additional validation data are available on request.