diff mbox series

clang: use Release instead of MinSizeRel

Message ID 20261019112517.1676091-1-martin.jansa@gmail.com
State New
Headers show
Series clang: use Release instead of MinSizeRel | expand

Commit Message

Martin Jansa Oct. 19, 2026, 11:25 a.m. UTC 
From: Martin Jansa <martin.jansa@gmail.com>

It was changed in:
https://git.openembedded.org/openembedded-core/commit/?id=ea9b33f7c12f773830ec860ae817a3ed1368612b
to save the disk space, but the build time impact is significant.

Both llvm and clang recipes are now using MinSizeRel, but the build time
impact is significant mostly from clang recipes and also the disk space
is affected more by llvm, than clang. So change the default only for
clang recipe. In theory we could use Release only for clang-native and
leave MinSizeRel for target clang (assuming that most people don't do
many demanding builds on target, but that won't be true for something
like build appliance built with OE).

chromium-x11.do_compile time with 64 thread AMD Threadripper 3970x
increased by 80% from 6930s to 12300s, measured in wrynose release.

With current master chromium-x11.do_compile time is also around 80%
slower compared to both using Release or 66.6% slower compared to
clang using Release:

MinSizeRel in both clang and llvm:
20.09user 2.56system 3:05:09elapsed 0%CPU (0avgtext+0avgdata 58500maxresident)k

MinSizeRel in llvm, Release in clang:
18.82user 2.61system 1:51:40elapsed 0%CPU (0avgtext+0avgdata 58776maxresident)k

Release in both clang and llvm:
18.83user 2.59system 1:45:32elapsed 0%CPU (0avgtext+0avgdata 59424maxresident)k

sstate-cache size after building core-image-sato with
PREFERRED_TOOLCHAIN_TARGET = "clang"
and target clang included as well as chromium-x11 in the image:

increased by less than 2% (137MB):
8988    sstate-cache-MinSizeRel-both
9125    sstate-cache-Release-both

populate_sysroot:
llvm:         14M: 175M -> 189M
llvm-native:  29M:  98M -> 127M
clang:         4M:  82M ->  86M
clang-native: 30M: 102M -> 132M

llvm package: 26M: 314M -> 340M
llvm ipk:     27M: 353M -> 380M

clang package: 3M:  89M ->  92M
clang ipk:     4M: 100M -> 104M

ipk package sizes:
7.0M    tmp-MinSizeRel/deploy/ipk/x86-64-v3/llvm-bin_23.1.3-r0.3_x86-64-v3.ipk
87M     tmp-MinSizeRel/deploy/ipk/x86-64-v3/llvm-dbg_23.1.3-r0.3_x86-64-v3.ipk
6.5M    tmp-MinSizeRel/deploy/ipk/x86-64-v3/llvm-dev_23.1.3-r0.3_x86-64-v3.ipk
66M     tmp-MinSizeRel/deploy/ipk/x86-64-v3/llvm-src_23.1.3-r0.3_x86-64-v3.ipk
153M    tmp-MinSizeRel/deploy/ipk/x86-64-v3/llvm-staticdev_23.1.3-r0.3_x86-64-v3.ipk
35M     tmp-MinSizeRel/deploy/ipk/x86-64-v3/llvm_23.1.3-r0.3_x86-64-v3.ipk

8.3M    tmp-Release/deploy/ipk/x86-64-v3/llvm-bin_23.1.3-r0.2_x86-64-v3.ipk
98M     tmp-Release/deploy/ipk/x86-64-v3/llvm-dbg_23.1.3-r0.2_x86-64-v3.ipk
6.5M    tmp-Release/deploy/ipk/x86-64-v3/llvm-dev_23.1.3-r0.2_x86-64-v3.ipk
66M     tmp-Release/deploy/ipk/x86-64-v3/llvm-src_23.1.3-r0.2_x86-64-v3.ipk
164M    tmp-Release/deploy/ipk/x86-64-v3/llvm-staticdev_23.1.3-r0.2_x86-64-v3.ipk
41M     tmp-Release/deploy/ipk/x86-64-v3/llvm_23.1.3-r0.2_x86-64-v3.ipk

8.8M    tmp-MinSizeRel/deploy/ipk/x86-64-v3/clang-dbg_23.1.3-r0.3_x86-64-v3.ipk
4.3M    tmp-MinSizeRel/deploy/ipk/x86-64-v3/clang-dev_23.1.3-r0.3_x86-64-v3.ipk
20K     tmp-MinSizeRel/deploy/ipk/x86-64-v3/clang-doc_23.1.3-r0.3_x86-64-v3.ipk
48K     tmp-MinSizeRel/deploy/ipk/x86-64-v3/clang-format_23.1.3-r0.3_x86-64-v3.ipk
40K     tmp-MinSizeRel/deploy/ipk/x86-64-v3/clang-libclang-python_23.1.3-r0.3_x86-64-v3.ipk
48M     tmp-MinSizeRel/deploy/ipk/x86-64-v3/clang-staticdev_23.1.3-r0.3_x86-64-v3.ipk
2.9M    tmp-MinSizeRel/deploy/ipk/x86-64-v3/clang-tidy_23.1.3-r0.3_x86-64-v3.ipk
1.3M    tmp-MinSizeRel/deploy/ipk/x86-64-v3/clang-tools_23.1.3-r0.3_x86-64-v3.ipk
6.1M    tmp-MinSizeRel/deploy/ipk/x86-64-v3/clang_23.1.3-r0.3_x86-64-v3.ipk
18M     tmp-MinSizeRel/deploy/ipk/x86-64-v3/libclang-cpp23.1_23.1.3-r0.3_x86-64-v3.ipk
11M     tmp-MinSizeRel/deploy/ipk/x86-64-v3/libclang23.1_23.1.3-r0.3_x86-64-v3.ipk

7.8M    tmp-Release/deploy/ipk/x86-64-v3/clang-dbg_23.1.3-r0.4_x86-64-v3.ipk
4.3M    tmp-Release/deploy/ipk/x86-64-v3/clang-dev_23.1.3-r0.4_x86-64-v3.ipk
20K     tmp-Release/deploy/ipk/x86-64-v3/clang-doc_23.1.3-r0.4_x86-64-v3.ipk
52K     tmp-Release/deploy/ipk/x86-64-v3/clang-format_23.1.3-r0.4_x86-64-v3.ipk
40K     tmp-Release/deploy/ipk/x86-64-v3/clang-libclang-python_23.1.3-r0.4_x86-64-v3.ipk
47M     tmp-Release/deploy/ipk/x86-64-v3/clang-staticdev_23.1.3-r0.4_x86-64-v3.ipk
3.3M    tmp-Release/deploy/ipk/x86-64-v3/clang-tidy_23.1.3-r0.4_x86-64-v3.ipk
1.4M    tmp-Release/deploy/ipk/x86-64-v3/clang-tools_23.1.3-r0.4_x86-64-v3.ipk
6.8M    tmp-Release/deploy/ipk/x86-64-v3/clang_23.1.3-r0.4_x86-64-v3.ipk
21M     tmp-Release/deploy/ipk/x86-64-v3/libclang-cpp23.1_23.1.3-r0.4_x86-64-v3.ipk
13M     tmp-Release/deploy/ipk/x86-64-v3/libclang23.1_23.1.3-r0.4_x86-64-v3.ipk

Signed-off-by: Martin Jansa <martin.jansa@gmail.com>
---
 meta/recipes-devtools/clang/clang_git.bb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/meta/recipes-devtools/clang/clang_git.bb b/meta/recipes-devtools/clang/clang_git.bb
index 3b93f0d02c..90076f9d6d 100644
--- a/meta/recipes-devtools/clang/clang_git.bb
+++ b/meta/recipes-devtools/clang/clang_git.bb
@@ -60,7 +60,7 @@  EXTRA_OECMAKE += "-DLLVM_ENABLE_ASSERTIONS=OFF \
                   -DFFI_INCLUDE_DIR=$(pkg-config --variable=includedir libffi) \
                   -DLLVM_BUILD_EXTERNAL_COMPILER_RT=ON \
                   -DCMAKE_SYSTEM_NAME=Linux \
-                  -DCMAKE_BUILD_TYPE=MinSizeRel \
+                  -DCMAKE_BUILD_TYPE=Release \
                   -DLLVM_VERSION_SUFFIX='${VER_SUFFIX}' \
                   -DLLVM_CMAKE_DIR=${STAGING_LIBDIR}/cmake/llvm \
                   -DLLVM_NATIVE_TOOL_DIR=${STAGING_BINDIR_NATIVE} \