github-actions[bot] wrote:
<!--PREMERGE ADVISOR COMMENT: Windows-->
# :window: Windows x64 Test Results
* 3109 tests passed
* 30 tests skipped
* 2 tests failed
## Failed Tests
(click on a test name to see its output)
### Clang Tools
<details>
<summary>Clang
Tools.clang-tidy/checkers/performance/inefficient-string-concatenation-strict.cpp</summary>
```
Exit Code: 1
Command Output (stdout):
--
# RUN: at line 1
C:/Python312/python.exe
C:/_work/llvm-project/llvm-project/clang-tools-extra/test/../test\clang-tidy\check_clang_tidy.py
C:\_work\llvm-project\llvm-project\clang-tools-extra\test\clang-tidy\checkers\performance\inefficient-string-concatenation-strict.cpp
performance-inefficient-string-concatenation
C:\_work\llvm-project\llvm-project\build\tools\clang\tools\extra\test\clang-tidy\checkers\performance\Output\inefficient-string-concatenation-strict.cpp.tmp
-- -config="{CheckOptions:
{performance-inefficient-string-concatenation.StrictMode: true}}"
# executed command: C:/Python312/python.exe
'C:/_work/llvm-project/llvm-project/clang-tools-extra/test/../test\clang-tidy\check_clang_tidy.py'
'C:\_work\llvm-project\llvm-project\clang-tools-extra\test\clang-tidy\checkers\performance\inefficient-string-concatenation-strict.cpp'
performance-inefficient-string-concatenation
'C:\_work\llvm-project\llvm-project\build\tools\clang\tools\extra\test\clang-tidy\checkers\performance\Output\inefficient-string-concatenation-strict.cpp.tmp'
-- '-config={CheckOptions:
{performance-inefficient-string-concatenation.StrictMode: true}}'
# .---command stdout------------
# | Running ['clang-tidy', '--experimental-custom-checks',
'C:\\_work\\llvm-project\\llvm-project\\build\\tools\\clang\\tools\\extra\\test\\clang-tidy\\checkers\\performance\\Output\\inefficient-string-concatenation-strict.cpp.tmp.cpp',
'-fix', '--checks=-*,performance-inefficient-string-concatenation',
'-config={CheckOptions:
{performance-inefficient-string-concatenation.StrictMode: true}}', '--',
'-std=c++11', '-nostdinc++', '-isystem',
'C:\\_work\\llvm-project\\llvm-project\\clang-tools-extra\\test\\clang-tidy\\checkers\\Inputs\\Headers\\std']...
# | ------------------------ clang-tidy output -----------------------
# | 2 warnings generated.
# |
# |
C:\_work\llvm-project\llvm-project\build\tools\clang\tools\extra\test\clang-tidy\checkers\performance\Output\inefficient-string-concatenation-strict.cpp.tmp.cpp:9:10:
warning: string concatenation results in allocation of unnecessary temporary
strings; consider using 'operator+=' or 'string::append()' instead
[performance-inefficient-string-concatenation]
# | 9 | mystr1 = mystr1 + mystr2;
# | | ~~~~~~~^~~~~~~~~~~~~~~~~
# | | mystr1 += mystr2
# |
C:\_work\llvm-project\llvm-project\build\tools\clang\tools\extra\test\clang-tidy\checkers\performance\Output\inefficient-string-concatenation-strict.cpp.tmp.cpp:9:3:
note: FIX-IT applied suggested code changes
# | 9 | mystr1 = mystr1 + mystr2;
# | | ^
# |
C:\_work\llvm-project\llvm-project\build\tools\clang\tools\extra\test\clang-tidy\checkers\performance\Output\inefficient-string-concatenation-strict.cpp.tmp.cpp:12:21:
warning: string concatenation results in allocation of unnecessary temporary
strings; consider using 'operator+=' or 'string::append()' instead
[performance-inefficient-string-concatenation]
# | clang-tidy applied 1 of 1 suggested fixes.
# |
# | 12 | f(mystr1 + mystr2 + mystr1);
# | | ^
# |
# | ------------------------------------------------------------------
# | diff -u
C:\_work\llvm-project\llvm-project\build\tools\clang\tools\extra\test\clang-tidy\checkers\performance\Output\inefficient-string-concatenation-strict.cpp.tmp.orig
C:\_work\llvm-project\llvm-project\build\tools\clang\tools\extra\test\clang-tidy\checkers\performance\Output\inefficient-string-concatenation-strict.cpp.tmp.cpp
failed:
# | ---
C:\_work\llvm-project\llvm-project\build\tools\clang\tools\extra\test\clang-tidy\checkers\performance\Output\inefficient-string-concatenation-strict.cpp.tmp.orig
2026-03-26 15:57:52.137809100 +0000
# | +++
C:\_work\llvm-project\llvm-project\build\tools\clang\tools\extra\test\clang-tidy\checkers\performance\Output\inefficient-string-concatenation-strict.cpp.tmp.cpp
2026-03-26 15:57:52.201281300 +0000
# | @@ -6,7 +6,7 @@
# |
# |
# | int main() {
# |
# | std::string mystr1, mystr2;
# |
# | - mystr1 = mystr1 + mystr2;
# |
# | + mystr1 += mystr2;
# |
# | //
# |
# |
# |
# | f(mystr1 + mystr2 + mystr1);
# |
# |
# | ------------------------------ Fixes -----------------------------
# | ---
C:\_work\llvm-project\llvm-project\build\tools\clang\tools\extra\test\clang-tidy\checkers\performance\Output\inefficient-string-concatenation-strict.cpp.tmp.orig
2026-03-26 15:57:52.137809100 +0000
# | +++
C:\_work\llvm-project\llvm-project\build\tools\clang\tools\extra\test\clang-tidy\checkers\performance\Output\inefficient-string-concatenation-strict.cpp.tmp.cpp
2026-03-26 15:57:52.201281300 +0000
# | @@ -6,7 +6,7 @@
# |
# |
# | int main() {
# |
# | std::string mystr1, mystr2;
# |
# | - mystr1 = mystr1 + mystr2;
# |
# | + mystr1 += mystr2;
# |
# | //
# |
# |
# |
# | f(mystr1 + mystr2 + mystr1);
# |
# |
# | ------------------------------------------------------------------
# | FileCheck
-input-file=C:\_work\llvm-project\llvm-project\build\tools\clang\tools\extra\test\clang-tidy\checkers\performance\Output\inefficient-string-concatenation-strict.cpp.tmp.cpp.msg
C:\_work\llvm-project\llvm-project\clang-tools-extra\test\clang-tidy\checkers\performance\inefficient-string-concatenation-strict.cpp
-check-prefixes=CHECK-MESSAGES -implicit-check-not={{warning|error}}: failed:
# |
C:\_work\llvm-project\llvm-project\clang-tools-extra\test\clang-tidy\checkers\performance\inefficient-string-concatenation-strict.cpp:10:21:
error: CHECK-MESSAGES: expected string not found in input
# |
# | // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: string concatenation results
in allocation of unnecessary temporary strings; consider using 'operator+=' or
'string::append()' instead [performance-inefficient-string-concatenation]
# |
# | ^
# |
# |
C:\_work\llvm-project\llvm-project\build\tools\clang\tools\extra\test\clang-tidy\checkers\performance\Output\inefficient-string-concatenation-strict.cpp.tmp.cpp.msg:1:1:
note: scanning from here
# |
# | 2 warnings generated.
# |
# | ^
# |
# |
C:\_work\llvm-project\llvm-project\build\tools\clang\tools\extra\test\clang-tidy\checkers\performance\Output\inefficient-string-concatenation-strict.cpp.tmp.cpp.msg:1:1:
note: with "@LINE-1" equal to "9"
# |
# | 2 warnings generated.
# |
# | ^
# |
# |
C:\_work\llvm-project\llvm-project\build\tools\clang\tools\extra\test\clang-tidy\checkers\performance\Output\inefficient-string-concatenation-strict.cpp.tmp.cpp.msg:2:163:
note: possible intended match here
# |
# |
C:\_work\llvm-project\llvm-project\build\tools\clang\tools\extra\test\clang-tidy\checkers\performance\Output\inefficient-string-concatenation-strict.cpp.tmp.cpp:9:10:
warning: string concatenation results in allocation of unnecessary temporary
strings; consider using 'operator+=' or 'string::append()' instead
[performance-inefficient-string-concatenation]
# |
# |
^
# |
# |
# |
# | Input file:
C:\_work\llvm-project\llvm-project\build\tools\clang\tools\extra\test\clang-tidy\checkers\performance\Output\inefficient-string-concatenation-strict.cpp.tmp.cpp.msg
# |
# | Check file:
C:\_work\llvm-project\llvm-project\clang-tools-extra\test\clang-tidy\checkers\performance\inefficient-string-concatenation-strict.cpp
# |
# |
# |
# | -dump-input=help explains the following input dump.
# |
# |
# |
# | Input was:
# |
# | <<<<<<
# |
# | 1: 2 warnings generated.
# |
# |
# | check:10'0 X~~~~~~~~~~~~~~~~~~~~~~ error: no match found
# |
# | check:10'1 with "@LINE-1" equal to "9"
# |
# | 2:
C:\_work\llvm-project\llvm-project\build\tools\clang\tools\extra\test\clang-tidy\checkers\performance\Output\inefficient-string-concatenation-strict.cpp.tmp.cpp:9:10:
warning: string concatenation results in allocation of unnecessary temporary
strings; consider using 'operator+=' or 'string::append()' instead
[performance-inefficient-string-concatenation]
# |
# | check:10'0
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# |
# | check:10'2
?
possible intended
match
# |
# | 3: 9 | mystr1 = mystr1 + mystr2;
# |
# | check:10'0 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# |
# | 4: | ~~~~~~~^~~~~~~~~~~~~~~~~
# |
# | check:10'0 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# |
# | 5: | mystr1 += mystr2
# |
# | check:10'0 ~~~~~~~~~~~~~~~~~~~~
# |
# | 6:
C:\_work\llvm-project\llvm-project\build\tools\clang\tools\extra\test\clang-tidy\checkers\performance\Output\inefficient-string-concatenation-strict.cpp.tmp.cpp:9:3:
note: FIX-IT applied suggested code changes
# |
# | check:10'0
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# |
# | 7: 9 | mystr1 = mystr1 + mystr2;
# |
# | check:10'0 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# |
# | .
# |
# | .
# |
# | .
# |
# | >>>>>>
# |
# |
# `-----------------------------
# .---command stderr------------
# | Traceback (most recent call last):
# | File
"C:\_work\llvm-project\llvm-project\clang-tools-extra\test\clang-tidy\check_clang_tidy.py",
line 554, in <module>
# | main()
# | File
"C:\_work\llvm-project\llvm-project\clang-tools-extra\test\clang-tidy\check_clang_tidy.py",
line 550, in main
# | CheckRunner(args, extra_args).run()
# | File
"C:\_work\llvm-project\llvm-project\clang-tools-extra\test\clang-tidy\check_clang_tidy.py",
line 433, in run
# | self.check_messages(main_output)
# | File
"C:\_work\llvm-project\llvm-project\clang-tools-extra\test\clang-tidy\check_clang_tidy.py",
line 358, in check_messages
# | try_run(
# | File
"C:\_work\llvm-project\llvm-project\clang-tools-extra\test\clang-tidy\check_clang_tidy.py",
line 64, in try_run
# | process_output = subprocess.check_output(args,
stderr=subprocess.STDOUT).decode(
# | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
# | File "c:\python312\Lib\subprocess.py", line 466, in check_output
# | return run(*popenargs, stdout=PIPE, timeout=timeout, check=True,
# | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
# | File "c:\python312\Lib\subprocess.py", line 571, in run
# | raise CalledProcessError(retcode, process.args,
# | subprocess.CalledProcessError: Command '['FileCheck',
'-input-file=C:\\_work\\llvm-project\\llvm-project\\build\\tools\\clang\\tools\\extra\\test\\clang-tidy\\checkers\\performance\\Output\\inefficient-string-concatenation-strict.cpp.tmp.cpp.msg',
'C:\\_work\\llvm-project\\llvm-project\\clang-tools-extra\\test\\clang-tidy\\checkers\\performance\\inefficient-string-concatenation-strict.cpp',
'-check-prefixes=CHECK-MESSAGES', '-implicit-check-not={{warning|error}}:']'
returned non-zero exit status 1.
# `-----------------------------
# error: command failed with exit status: 1
--
```
</details>
<details>
<summary>Clang
Tools.clang-tidy/checkers/performance/inefficient-string-concatenation.cpp</summary>
```
Exit Code: 1
Command Output (stdout):
--
# RUN: at line 1
C:/Python312/python.exe
C:/_work/llvm-project/llvm-project/clang-tools-extra/test/../test\clang-tidy\check_clang_tidy.py
C:\_work\llvm-project\llvm-project\clang-tools-extra\test\clang-tidy\checkers\performance\inefficient-string-concatenation.cpp
performance-inefficient-string-concatenation
C:\_work\llvm-project\llvm-project\build\tools\clang\tools\extra\test\clang-tidy\checkers\performance\Output\inefficient-string-concatenation.cpp.tmp
# executed command: C:/Python312/python.exe
'C:/_work/llvm-project/llvm-project/clang-tools-extra/test/../test\clang-tidy\check_clang_tidy.py'
'C:\_work\llvm-project\llvm-project\clang-tools-extra\test\clang-tidy\checkers\performance\inefficient-string-concatenation.cpp'
performance-inefficient-string-concatenation
'C:\_work\llvm-project\llvm-project\build\tools\clang\tools\extra\test\clang-tidy\checkers\performance\Output\inefficient-string-concatenation.cpp.tmp'
# .---command stdout------------
# | Running ['clang-tidy', '--experimental-custom-checks',
'C:\\_work\\llvm-project\\llvm-project\\build\\tools\\clang\\tools\\extra\\test\\clang-tidy\\checkers\\performance\\Output\\inefficient-string-concatenation.cpp.tmp.cpp',
'-fix', '--checks=-*,performance-inefficient-string-concatenation',
'--config={}', '--', '-std=c++11', '-nostdinc++', '-isystem',
'C:\\_work\\llvm-project\\llvm-project\\clang-tools-extra\\test\\clang-tidy\\checkers\\Inputs\\Headers\\std']...
# | clang-tidy --experimental-custom-checks
C:\_work\llvm-project\llvm-project\build\tools\clang\tools\extra\test\clang-tidy\checkers\performance\Output\inefficient-string-concatenation.cpp.tmp.cpp
-fix --checks=-*,performance-inefficient-string-concatenation --config={} --
-std=c++11 -nostdinc++ -isystem
C:\_work\llvm-project\llvm-project\clang-tools-extra\test\clang-tidy\checkers\Inputs\Headers\std
failed:
# | 7 warnings and 3 errors generated.
# |
# | Error while processing
C:\_work\llvm-project\llvm-project\build\tools\clang\tools\extra\test\clang-tidy\checkers\performance\Output\inefficient-string-concatenation.cpp.tmp.cpp.
# |
# |
C:\_work\llvm-project\llvm-project\build\tools\clang\tools\extra\test\clang-tidy\checkers\performance\Output\inefficient-string-concatenation.cpp.tmp.cpp:14:23:
warning: string concatenation results in allocation of unnecessary temporary
strings; consider using 'operator+=' or 'string::append()' instead
[performance-inefficient-string-concatenation]
# | 14 | f(mystr1 + mystr2 + mystr1);
# | | ^
# |
C:\_work\llvm-project\llvm-project\build\tools\clang\tools\extra\test\clang-tidy\checkers\performance\Output\inefficient-string-concatenation.cpp.tmp.cpp:16:12:
warning: string concatenation results in allocation of unnecessary temporary
strings; consider using 'operator+=' or 'string::append()' instead
[performance-inefficient-string-concatenation]
# | 16 | mystr1 = mystr1 + mystr2;
# | | ~~~~~~~^~~~~~~~~~~~~~~~~
# | | mystr1 += mystr2
# |
C:\_work\llvm-project\llvm-project\build\tools\clang\tools\extra\test\clang-tidy\checkers\performance\Output\inefficient-string-concatenation.cpp.tmp.cpp:19:30:
warning: string concatenation results in allocation of unnecessary temporary
strings; consider using 'operator+=' or 'string::append()' instead
[performance-inefficient-string-concatenation]
# | 19 | mystr1 = mystr2 + mystr2 + mystr2;
# | | ^
# |
C:\_work\llvm-project\llvm-project\build\tools\clang\tools\extra\test\clang-tidy\checkers\performance\Output\inefficient-string-concatenation.cpp.tmp.cpp:21:12:
warning: string concatenation results in allocation of unnecessary temporary
strings; consider using 'operator+=' or 'string::append()' instead
[performance-inefficient-string-concatenation]
# | 21 | mystr1 = mystr2 + mystr1;
# | | ~~~~~~~^~~~~~~~~~~~~~~~~
# | | mystr1 += mystr2
# |
C:\_work\llvm-project\llvm-project\build\tools\clang\tools\extra\test\clang-tidy\checkers\performance\Output\inefficient-string-concatenation.cpp.tmp.cpp:24:13:
warning: string concatenation results in allocation of unnecessary temporary
strings; consider using 'operator+=' or 'string::append()' instead
[performance-inefficient-string-concatenation]
# | 24 | mywstr1 = mywstr2 + mywstr1;
# | | ~~~~~~~~^~~~~~~~~~~~~~~~~~~
# | | mywstr1 += mywstr2
# |
C:\_work\llvm-project\llvm-project\build\tools\clang\tools\extra\test\clang-tidy\checkers\performance\Output\inefficient-string-concatenation.cpp.tmp.cpp:27:33:
warning: string concatenation results in allocation of unnecessary temporary
strings; consider using 'operator+=' or 'string::append()' instead
[performance-inefficient-string-concatenation]
# | 27 | mywstr1 = mywstr2 + mywstr2 + mywstr2;
# | | ^
# |
C:\_work\llvm-project\llvm-project\build\tools\clang\tools\extra\test\clang-tidy\checkers\performance\Output\inefficient-string-concatenation.cpp.tmp.cpp:29:16:
warning: string concatenation results in allocation of unnecessary temporary
strings; consider using 'operator+=' or 'string::append()' instead
[performance-inefficient-string-concatenation]
# | 29 | myautostr1 = myautostr1 + myautostr2;
# | | ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
# | | myautostr1 += myautostr2
# |
C:\_work\llvm-project\llvm-project\build\tools\clang\tools\extra\test\clang-tidy\checkers\performance\Output\inefficient-string-concatenation.cpp.tmp.cpp:34:4:
error: unterminated /* comment [clang-diagnostic-error]
# | 34 | /* mystr1 = mystr1 + mystr2 + mystr2;
# | | ^
# |
C:\_work\llvm-project\llvm-project\build\tools\clang\tools\extra\test\clang-tidy\checkers\performance\Output\inefficient-string-concatenation.cpp.tmp.cpp:53:2:
error: expected '}' [clang-diagnostic-error]
# | 53 | }
# | | ^
# |
C:\_work\llvm-project\llvm-project\build\tools\clang\tools\extra\test\clang-tidy\checkers\performance\Output\inefficient-string-concatenation.cpp.tmp.cpp:13:32:
note: to match this '{'
# | 13 | for (int i = 0; i < 10; ++i) {
# | | ^
# | Found compiler errors, but -fix-errors was not specified.
# |
# | Fixes have NOT been applied.
# |
# |
# |
# | Found compiler error(s).
# |
# |
# `-----------------------------
# .---command stderr------------
# | Traceback (most recent call last):
# | File
"C:\_work\llvm-project\llvm-project\clang-tools-extra\test\clang-tidy\check_clang_tidy.py",
line 554, in <module>
# | main()
# | File
"C:\_work\llvm-project\llvm-project\clang-tools-extra\test\clang-tidy\check_clang_tidy.py",
line 550, in main
# | CheckRunner(args, extra_args).run()
# | File
"C:\_work\llvm-project\llvm-project\clang-tools-extra\test\clang-tidy\check_clang_tidy.py",
line 426, in run
# | clang_tidy_output = self.run_clang_tidy()
# | ^^^^^^^^^^^^^^^^^^^^^
# | File
"C:\_work\llvm-project\llvm-project\clang-tools-extra\test\clang-tidy\check_clang_tidy.py",
line 289, in run_clang_tidy
# | clang_tidy_output = try_run(args)
# | ^^^^^^^^^^^^^
# | File
"C:\_work\llvm-project\llvm-project\clang-tools-extra\test\clang-tidy\check_clang_tidy.py",
line 64, in try_run
# | process_output = subprocess.check_output(args,
stderr=subprocess.STDOUT).decode(
# | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
# | File "c:\python312\Lib\subprocess.py", line 466, in check_output
# | return run(*popenargs, stdout=PIPE, timeout=timeout, check=True,
# | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
# | File "c:\python312\Lib\subprocess.py", line 571, in run
# | raise CalledProcessError(retcode, process.args,
# | subprocess.CalledProcessError: Command '['clang-tidy',
'--experimental-custom-checks',
'C:\\_work\\llvm-project\\llvm-project\\build\\tools\\clang\\tools\\extra\\test\\clang-tidy\\checkers\\performance\\Output\\inefficient-string-concatenation.cpp.tmp.cpp',
'-fix', '--checks=-*,performance-inefficient-string-concatenation',
'--config={}', '--', '-std=c++11', '-nostdinc++', '-isystem',
'C:\\_work\\llvm-project\\llvm-project\\clang-tools-extra\\test\\clang-tidy\\checkers\\Inputs\\Headers\\std']'
returned non-zero exit status 1.
# `-----------------------------
# error: command failed with exit status: 1
--
```
</details>
If these failures are unrelated to your changes (for example tests are broken
or flaky at HEAD), please open an issue at
https://github.com/llvm/llvm-project/issues and add the `infrastructure` label.
https://github.com/llvm/llvm-project/pull/188430
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