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Merged
merged 3 commits into from
Oct 2, 2025
Merged

gnu: Add legacy Zephyr compatibility #989

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55a37de
gnu: Add legacy Zephyr bisectability
keith-packard Jul 31, 2025
b7f98b0
cmake: Remove stale comment about riscv and -Os
keith-packard Sep 30, 2025
1af31ad
cmake: Switch TOOLCHAIN_VARIANT_COMPILER test around for old Zephyr b…
keith-packard Sep 30, 2025
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6 changes: 5 additions & 1 deletion cmake/Zephyr-sdkConfig.cmake
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Original file line number Diff line number Diff line change
Expand Up @@ -13,7 +13,11 @@ get_filename_component(ZEPHYR_SDK_INSTALL_DIR ${CMAKE_CURRENT_LIST_DIR}/.. ABSOL
set(ZEPHYR_SDK_INSTALL_DIR ${ZEPHYR_SDK_INSTALL_DIR})

if(NOT DEFINED ZEPHYR_TOOLCHAIN_VARIANT)
set(ZEPHYR_TOOLCHAIN_VARIANT "zephyr/gnu")
if(DEFINED ZEPHYR_TOOLCHAIN_VARIANT_COMPILER_SUPPORT)
set(ZEPHYR_TOOLCHAIN_VARIANT "zephyr/gnu")
else()
set(ZEPHYR_TOOLCHAIN_VARIANT "zephyr")
endif()
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In Zephyr-sdkConfig.cmake, set ZEPHYR_TOOLCHAIN_VARIANT to zephyr/gnu only when Zephyr sets ZEPHYR_TOOLCHAIN_VARIANT_COMPILER_SUPPORT before finding the SDK module. This will require a change to Zephyr, which is unfortunate. Ideally, we'd use some existing mechanism to detect when to make this switch.

What about using Zephyr version?

SDK 1.0.0 support will be available from Zephyr 4.3.0 (well, 4.2.99/main at this time), so we can set the default ZEPHYR_TOOLCHAIN_VARIANT=zephyr when Zephyr_VERSION VERSION_LESS 4.2.99

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We need something that changes precisely when Zephyr gets this support so that we can do SDK validation across the change. That won't align with a Zephyr version change, it will happen when the SDK compatibility patches are merged to Zephyr, and we can add this symbol at that point. We can remove it once we're done with the transition.

endif()

# Those are CMake package parameters.
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3 changes: 1 addition & 2 deletions cmake/zephyr/Kconfig
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Expand Up @@ -24,7 +24,6 @@ config PICOLIBC_DEFAULT
Zephyr SDK >=0.17.1 always uses Picolibc

# libstdc++ is built without exception support in -Os mode
# gcc 14.3 has bugs compiling with -Os on riscv
choice COMPILER_OPTIMIZATIONS
default SPEED_OPTIMIZATIONS if ("$(TOOLCHAIN_VARIANT_COMPILER)" = "gnu") && CPP_EXCEPTIONS
default SPEED_OPTIMIZATIONS if ("$(TOOLCHAIN_VARIANT_COMPILER)" != "llvm") && CPP_EXCEPTIONS
endchoice
15 changes: 15 additions & 0 deletions scripts/template_setup_posix
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Expand Up @@ -69,6 +69,7 @@ usage()
echo " all Install all GNU toolchains"
echo " -l Install LLVM toolchain"
echo " -h Install host tools"
echo " -o Create symbolic links matching the old SDK layout for old Zephyr (< 4.3) bisectability"
echo " -c Register Zephyr SDK CMake package"
echo
echo "Supported GNU Toolchains:"
Expand Down Expand Up @@ -117,6 +118,8 @@ user_prompt()
# Environment Configurations
ask_yn "Register Zephyr SDK CMake package" && do_cmake_pkg="y"

ask_yn "Create symbolic links for old Zephyr bisectability" && do_old_zephyr="y"

echo
}

Expand Down Expand Up @@ -159,6 +162,9 @@ else
-c)
do_cmake_pkg="y"
;;
-o)
do_old_zephyr="y"
;;
'-?')
usage
exit 0
Expand Down Expand Up @@ -301,6 +307,15 @@ if [ "${do_cmake_pkg}" = "y" ]; then
echo
fi

# Create links for old Zephyr versions
if [ "${do_old_zephyr}" = "y" ]; then
echo "Creating links for old Zephyr bisectability ..."
ln -sr gnu/* . || assert_rc "ERROR: Creating toolchain links" 50
ln -sr cmake/zephyr/gnu/* cmake/zephyr || assert_rc "ERROR: Creating cmake links" 50
ln -sr hosttools/* . || assert_rc "ERROR: Creating hosttools links" 50
echo
fi

echo "All done."
if [ "${interactive}" = "y" ]; then
read -n 1 -s -r -p "Press any key to exit ..."
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