[PATCH 1/3] classes/toolchain/clang: compiler-rt and libcxx are not target-specific

[PATCH 1/3] classes/toolchain/clang: compiler-rt and libcxx are not target-specific

[Ross Burton]

This file can be used for nativesdk builds, which if they are using the
clang toolchain will also need compiler-rt and libcxx.

Signed-off-by: Ross Burton <ross.burton@arm.com>
---
 meta/classes/toolchain/clang.bbclass | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/meta/classes/toolchain/clang.bbclass b/meta/classes/toolchain/clang.bbclass
index 7c6ed57fb31..00cf6230408 100644
--- a/meta/classes/toolchain/clang.bbclass
+++ b/meta/classes/toolchain/clang.bbclass
@@ -26,8 +26,7 @@ PREFERRED_PROVIDER_virtual/nativesdk-cross-c++:class-crosssdk = "clang-crosssdk-
 PREFERRED_PROVIDER_virtual/nativesdk-cross-cc:class-cross-canadian = "clang-crosssdk-${SDK_SYS}"
 PREFERRED_PROVIDER_virtual/nativesdk-cross-c++:class-cross-canadian = "clang-crosssdk-${SDK_SYS}"
 
-
-BASE_DEFAULT_DEPS:append:class-target = " compiler-rt libcxx"
+BASE_DEFAULT_DEPS:append = " compiler-rt libcxx"
 
 TUNE_CCARGS += "${@bb.utils.contains("DISTRO_FEATURES", "usrmerge", " --dyld-prefix=/usr", "", d)}"
 
-- 
2.43.0

[PATCH 2/3] clang-cross: trim the recipe

[Ross Burton]

As a single clang-native build is a cross-compiler for all targets, this
recipe should simply create target-prefixed symlinks.

As such, it doesn't need to pull in the common clang include files, or
set TOOLCHAIN.

Unsetting PACKAGES isn't needed as cross inherits nopackages.

The sysroot preprocessing is used to stage bindir, but cross recipes
already stage this directory.

There doesn't appear to be a need to copy clang, so these are now linked
too.

Signed-off-by: Ross Burton <ross.burton@arm.com>
---
 .../recipes-devtools/clang/clang-cross_git.bb | 27 ++++---------------
 1 file changed, 5 insertions(+), 22 deletions(-)

diff --git a/meta/recipes-devtools/clang/clang-cross_git.bb b/meta/recipes-devtools/clang/clang-cross_git.bb
index 99e48522a0b..aef08c65e31 100644
--- a/meta/recipes-devtools/clang/clang-cross_git.bb
+++ b/meta/recipes-devtools/clang/clang-cross_git.bb
@@ -3,39 +3,22 @@
 
 SUMMARY = "Cross compiler wrappers for LLVM based C/C++ compiler"
 HOMEPAGE = "http://clang.llvm.org/"
-LIC_FILES_CHKSUM = "file://${COMMON_LICENSE_DIR}/Apache-2.0-with-LLVM-exception;md5=0bcd48c3bdfef0c9d9fd17726e4b7dab"
+LICENSE = "MIT"
+LIC_FILES_CHKSUM = "file://${COMMON_LICENSE_DIR}/MIT;md5=0835ade698e0bcf8506ecda2f7b4f302"
 SECTION = "devel"
 
 PN = "clang-cross-${TARGET_ARCH}"
-BPN = "clang"
 
-require common-clang.inc
-require common-source.inc
 inherit cross
-TOOLCHAIN = "clang"
-DEPENDS += "clang-native virtual/cross-binutils"
 
-#INHIBIT_PACKAGE_STRIP = "1"
-INHIBIT_SYSROOT_STRIP = "1"
+DEPENDS += "clang-native"
+
 do_install() {
         install -d ${D}${bindir}
-	for tool in clang-tidy lld ld.lld llvm-profdata \
+	for tool in clang clang++ clang-tidy lld ld.lld llvm-profdata \
             llvm-nm llvm-ar llvm-as llvm-ranlib llvm-strip llvm-objcopy llvm-objdump llvm-readelf \
             llvm-addr2line llvm-dwp llvm-size llvm-strings llvm-cov
 	do
 		ln -sf ../$tool ${D}${bindir}/${TARGET_PREFIX}$tool
 	done
-	install -m 0755 ${STAGING_BINDIR_NATIVE}/clang ${D}${bindir}/${TARGET_PREFIX}clang
-	install -m 0755 ${STAGING_BINDIR_NATIVE}/clang ${D}${bindir}/${TARGET_PREFIX}clang++
 }
-SSTATE_SCAN_FILES += "*-clang *-clang++ *-llvm-profdata *-lld *-ld.lld \
-                      *-llvm-nm *-llvm-ar *-llvm-as *-llvm-ranlib *-llvm-strip \
-                      *-llvm-objcopy *-llvm-objdump *-llvm-readelf *-llvm-addr2line \
-                      *-llvm-dwp *-llvm-size *-llvm-strings *-llvm-cov"
-
-SYSROOT_PREPROCESS_FUNCS += "clangcross_sysroot_preprocess"
-
-clangcross_sysroot_preprocess () {
-        sysroot_stage_dir ${D}${bindir} ${SYSROOT_DESTDIR}${bindir}
-}
-PACKAGES = ""
-- 
2.43.0

[PATCH 3/3] clang: split lld into a separate lld recipe

[Ross Burton]

The lld linker is a standalone project under the LLVM umbrella that just
depends on libLLVM and nothing else, such as clang.

To reduce the build time of clang if lld is not being used, split it out
into a separate recipe.

To ensure that lld is present if needed, the clang-cross recipe will
depend on lld-native if ld-is-lld is enable.

Signed-off-by: Ross Burton <ross.burton@arm.com>
---
 meta/conf/distro/include/maintainers.inc      |  1 +
 .../recipes-devtools/clang/clang-cross_git.bb |  2 +-
 meta/recipes-devtools/clang/clang_git.bb      |  8 +++-----
 meta/recipes-devtools/clang/lld_git.bb        | 20 +++++++++++++++++++
 4 files changed, 25 insertions(+), 6 deletions(-)
 create mode 100644 meta/recipes-devtools/clang/lld_git.bb

diff --git a/meta/conf/distro/include/maintainers.inc b/meta/conf/distro/include/maintainers.inc
index 927aac16d6d..5260bde36bc 100644
--- a/meta/conf/distro/include/maintainers.inc
+++ b/meta/conf/distro/include/maintainers.inc
@@ -480,6 +480,7 @@ RECIPE_MAINTAINER:pn-linux-yocto = "Bruce Ashfield <bruce.ashfield@gmail.com>"
 RECIPE_MAINTAINER:pn-linux-yocto-dev = "Bruce Ashfield <bruce.ashfield@gmail.com>"
 RECIPE_MAINTAINER:pn-linux-yocto-rt = "Bruce Ashfield <bruce.ashfield@gmail.com>"
 RECIPE_MAINTAINER:pn-linux-yocto-tiny = "Bruce Ashfield <bruce.ashfield@gmail.com>"
+RECIPE_MAINTAINER:pn-lld = "Khem Raj <raj.khem@gmail.com>"
 RECIPE_MAINTAINER:pn-lldb = "Khem Raj <raj.khem@gmail.com>"
 RECIPE_MAINTAINER:pn-llvm-project-source-20.1.8 = "Khem Raj <raj.khem@gmail.com>"
 RECIPE_MAINTAINER:pn-llvm-tblgen-native = "Khem Raj <raj.khem@gmail.com>"
diff --git a/meta/recipes-devtools/clang/clang-cross_git.bb b/meta/recipes-devtools/clang/clang-cross_git.bb
index aef08c65e31..e60eccdc771 100644
--- a/meta/recipes-devtools/clang/clang-cross_git.bb
+++ b/meta/recipes-devtools/clang/clang-cross_git.bb
@@ -11,7 +11,7 @@ PN = "clang-cross-${TARGET_ARCH}"
 
 inherit cross
 
-DEPENDS += "clang-native"
+DEPENDS += "clang-native ${@bb.utils.contains('DISTRO_FEATURES', 'ld-is-lld', 'lld-native', '', d)}"
 
 do_install() {
         install -d ${D}${bindir}
diff --git a/meta/recipes-devtools/clang/clang_git.bb b/meta/recipes-devtools/clang/clang_git.bb
index 830c0282cd6..60eb256e1ad 100644
--- a/meta/recipes-devtools/clang/clang_git.bb
+++ b/meta/recipes-devtools/clang/clang_git.bb
@@ -83,7 +83,7 @@ PACKAGECONFIG[eh] = "-DLLVM_ENABLE_EH=ON,-DLLVM_ENABLE_EH=OFF,,"
 PACKAGECONFIG[libcplusplus] = "-DCLANG_DEFAULT_CXX_STDLIB=libc++,,"
 PACKAGECONFIG[libedit] = "-DLLVM_ENABLE_LIBEDIT=ON,-DLLVM_ENABLE_LIBEDIT=OFF,libedit libedit-native"
 PACKAGECONFIG[libomp] = "-DCLANG_DEFAULT_OPENMP_RUNTIME=libomp,,"
-PACKAGECONFIG[lld] = "-DCLANG_DEFAULT_LINKER=lld,,"
+PACKAGECONFIG[lld] = "-DCLANG_DEFAULT_LINKER=lld,,,lld"
 PACKAGECONFIG[lto] = "-DLLVM_ENABLE_LTO=Full -DLLVM_BINUTILS_INCDIR=${STAGING_INCDIR},,binutils,"
 PACKAGECONFIG[pfm] = "-DLLVM_ENABLE_LIBPFM=ON,-DLLVM_ENABLE_LIBPFM=OFF,libpfm,"
 PACKAGECONFIG[rtti] = "-DLLVM_ENABLE_RTTI=ON,-DLLVM_ENABLE_RTTI=OFF,,"
@@ -133,7 +133,7 @@ HF[vardepvalue] = "${HF}"
 
 # Ensure that LLVM_PROJECTS does not contain compiler runtime components e.g. libcxx etc
 # they are enabled via LLVM_ENABLE_RUNTIMES
-LLVM_PROJECTS ?= "clang;clang-tools-extra;lld"
+LLVM_PROJECTS ?= "clang;clang-tools-extra"
 
 # linux hosts (.so) on Windows .pyd
 SOLIBSDEV:mingw32 = ".pyd"
@@ -419,10 +419,8 @@ clang_sysroot_preprocess() {
 	install -d ${SYSROOT_DESTDIR}${bindir_crossscripts}/
 	install -m 0755 ${S}/llvm/tools/llvm-config/llvm-config ${SYSROOT_DESTDIR}${bindir_crossscripts}/
 	ln -sf llvm-config ${SYSROOT_DESTDIR}${bindir_crossscripts}/llvm-config${PV}
-	# LLDTargets.cmake references the lld executable(!) that some modules/plugins link to
-	install -d ${SYSROOT_DESTDIR}${bindir}
 
-	binaries="lld diagtool clang-${MAJOR_VER} clang-format clang-offload-packager
+	binaries="diagtool clang-${MAJOR_VER} clang-format clang-offload-packager
 	                clang-offload-bundler clang-scan-deps clang-repl
 	                clang-refactor clang-check clang-extdef-mapping clang-apply-replacements
 	                clang-reorder-fields clang-tidy clang-change-namespace clang-doc clang-include-fixer
diff --git a/meta/recipes-devtools/clang/lld_git.bb b/meta/recipes-devtools/clang/lld_git.bb
new file mode 100644
index 00000000000..6c8ba03c052
--- /dev/null
+++ b/meta/recipes-devtools/clang/lld_git.bb
@@ -0,0 +1,20 @@
+SUMMARY = "LLD - the LLVM Linker"
+DESCRIPTION = "LLD is a linker from the LLVM project that is a drop-in replacement for system linkers and runs much faster than them."
+HOMEPAGE = "https://lld.llvm.org"
+SECTION = "devel"
+
+require common-clang.inc
+require common-source.inc
+
+LIC_FILES_CHKSUM = "file://lld/LICENSE.TXT;md5=ae7dc7c027b1fa89b5b013d391d3ee2b"
+
+inherit cmake pkgconfig
+
+DEPENDS = "llvm-tblgen-native llvm"
+
+OECMAKE_SOURCEPATH = "${S}/lld"
+
+EXTRA_OECMAKE = "-DLLVM_INCLUDE_TESTS=OFF \
+                 -DLLVM_TABLEGEN_EXE=${STAGING_BINDIR_NATIVE}/llvm-tblgen"
+
+BBCLASSEXTEND = "native nativesdk"
-- 
2.43.0

Patchtest results for [PATCH 2/3] clang-cross: trim the recipe

[patchtest]

[-- Attachment #1: Type: text/plain, Size: 3011 bytes --]

Thank you for your submission. Patchtest identified one
or more issues with the patch. Please see the log below for
more information:

---
Testing patch /home/patchtest/share/mboxes/2-3-clang-cross-trim-the-recipe.patch

FAIL: test lic files chksum modified not mentioned: LIC_FILES_CHKSUM changed without "License-Update:" tag and description in commit message (test_metadata.TestMetadata.test_lic_files_chksum_modified_not_mentioned)

PASS: pretest src uri left files (test_metadata.TestMetadata.pretest_src_uri_left_files)
PASS: test CVE check ignore (test_metadata.TestMetadata.test_cve_check_ignore)
PASS: test Signed-off-by presence (test_mbox.TestMbox.test_signed_off_by_presence)
PASS: test author valid (test_mbox.TestMbox.test_author_valid)
PASS: test commit message presence (test_mbox.TestMbox.test_commit_message_presence)
PASS: test commit message user tags (test_mbox.TestMbox.test_commit_message_user_tags)
PASS: test max line length (test_metadata.TestMetadata.test_max_line_length)
PASS: test mbox format (test_mbox.TestMbox.test_mbox_format)
PASS: test non-AUH upgrade (test_mbox.TestMbox.test_non_auh_upgrade)
PASS: test shortlog format (test_mbox.TestMbox.test_shortlog_format)
PASS: test shortlog length (test_mbox.TestMbox.test_shortlog_length)
PASS: test src uri left files (test_metadata.TestMetadata.test_src_uri_left_files)
PASS: test target mailing list (test_mbox.TestMbox.test_target_mailing_list)

SKIP: pretest pylint: No python related patches, skipping test (test_python_pylint.PyLint.pretest_pylint)
SKIP: test CVE tag format: No new CVE patches introduced (test_patch.TestPatch.test_cve_tag_format)
SKIP: test Signed-off-by presence: No new CVE patches introduced (test_patch.TestPatch.test_signed_off_by_presence)
SKIP: test Upstream-Status presence: No new CVE patches introduced (test_patch.TestPatch.test_upstream_status_presence_format)
SKIP: test bugzilla entry format: No bug ID found (test_mbox.TestMbox.test_bugzilla_entry_format)
SKIP: test lic files chksum presence: No added recipes, skipping test (test_metadata.TestMetadata.test_lic_files_chksum_presence)
SKIP: test license presence: No added recipes, skipping test (test_metadata.TestMetadata.test_license_presence)
SKIP: test pylint: No python related patches, skipping test (test_python_pylint.PyLint.test_pylint)
SKIP: test series merge on head: Merge test is disabled for now (test_mbox.TestMbox.test_series_merge_on_head)
SKIP: test summary presence: No added recipes, skipping test (test_metadata.TestMetadata.test_summary_presence)

---

Please address the issues identified and
submit a new revision of the patch, or alternatively, reply to this
email with an explanation of why the patch should be accepted. If you
believe these results are due to an error in patchtest, please submit a
bug at https://bugzilla.yoctoproject.org/ (use the 'Patchtest' category
under 'Yocto Project Subprojects'). For more information on specific
failures, see: https://wiki.yoctoproject.org/wiki/Patchtest. Thank
you!

Patchtest results for [PATCH 3/3] clang: split lld into a separate lld recipe

[patchtest]

[-- Attachment #1: Type: text/plain, Size: 3026 bytes --]

Thank you for your submission. Patchtest identified one
or more issues with the patch. Please see the log below for
more information:

---
Testing patch /home/patchtest/share/mboxes/3-3-clang-split-lld-into-a-separate-lld-recipe.patch

FAIL: test lic files chksum modified not mentioned: LIC_FILES_CHKSUM changed without "License-Update:" tag and description in commit message (test_metadata.TestMetadata.test_lic_files_chksum_modified_not_mentioned)

PASS: pretest src uri left files (test_metadata.TestMetadata.pretest_src_uri_left_files)
PASS: test CVE check ignore (test_metadata.TestMetadata.test_cve_check_ignore)
PASS: test Signed-off-by presence (test_mbox.TestMbox.test_signed_off_by_presence)
PASS: test author valid (test_mbox.TestMbox.test_author_valid)
PASS: test commit message presence (test_mbox.TestMbox.test_commit_message_presence)
PASS: test commit message user tags (test_mbox.TestMbox.test_commit_message_user_tags)
PASS: test max line length (test_metadata.TestMetadata.test_max_line_length)
PASS: test mbox format (test_mbox.TestMbox.test_mbox_format)
PASS: test non-AUH upgrade (test_mbox.TestMbox.test_non_auh_upgrade)
PASS: test shortlog format (test_mbox.TestMbox.test_shortlog_format)
PASS: test shortlog length (test_mbox.TestMbox.test_shortlog_length)
PASS: test src uri left files (test_metadata.TestMetadata.test_src_uri_left_files)
PASS: test target mailing list (test_mbox.TestMbox.test_target_mailing_list)

SKIP: pretest pylint: No python related patches, skipping test (test_python_pylint.PyLint.pretest_pylint)
SKIP: test CVE tag format: No new CVE patches introduced (test_patch.TestPatch.test_cve_tag_format)
SKIP: test Signed-off-by presence: No new CVE patches introduced (test_patch.TestPatch.test_signed_off_by_presence)
SKIP: test Upstream-Status presence: No new CVE patches introduced (test_patch.TestPatch.test_upstream_status_presence_format)
SKIP: test bugzilla entry format: No bug ID found (test_mbox.TestMbox.test_bugzilla_entry_format)
SKIP: test lic files chksum presence: No added recipes, skipping test (test_metadata.TestMetadata.test_lic_files_chksum_presence)
SKIP: test license presence: No added recipes, skipping test (test_metadata.TestMetadata.test_license_presence)
SKIP: test pylint: No python related patches, skipping test (test_python_pylint.PyLint.test_pylint)
SKIP: test series merge on head: Merge test is disabled for now (test_mbox.TestMbox.test_series_merge_on_head)
SKIP: test summary presence: No added recipes, skipping test (test_metadata.TestMetadata.test_summary_presence)

---

Please address the issues identified and
submit a new revision of the patch, or alternatively, reply to this
email with an explanation of why the patch should be accepted. If you
believe these results are due to an error in patchtest, please submit a
bug at https://bugzilla.yoctoproject.org/ (use the 'Patchtest' category
under 'Yocto Project Subprojects'). For more information on specific
failures, see: https://wiki.yoctoproject.org/wiki/Patchtest. Thank
you!

Re: [OE-core] [PATCH 1/3] classes/toolchain/clang: compiler-rt and libcxx are not target-specific

[Mathieu Dubois-Briand]

On Mon Jul 28, 2025 at 5:55 PM CEST, Ross Burton via lists.openembedded.org wrote:
> This file can be used for nativesdk builds, which if they are using the
> clang toolchain will also need compiler-rt and libcxx.
>
> Signed-off-by: Ross Burton <ross.burton@arm.com>
> ---

Hi Ross,

It looks like this is breaking something:

ERROR: libcxx-20.1.8-r0 do_package: Error executing a python function in exec_func_python() autogenerated:
...
Exception: FileNotFoundError: [Errno 2] No such file or directory: 'x86_64-poky-linux-musl-objdump'

https://autobuilder.yoctoproject.org/valkyrie/#/builders/3/builds/2166
https://autobuilder.yoctoproject.org/valkyrie/#/builders/17/builds/1957

-- 
Mathieu Dubois-Briand, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com