[DTLTO][TEST] Make Clang driver tests more robust #159151

bd1976bris · 2025-09-16T18:51:09Z

The Clang driver tests tried to match the Clang executable name via a regular expression. This failed on some buildbots where the name was not anticipated.

Make the test more robust by extracting the filename with Python and appending a line to the output. This is then captured into a FileCheck variable and used directly in the check for the executable name.

Should fix buildbot failures caused by the merge of PR #159129.

The Clang driver tests tried to match the Clang executable name via a regular expression. This failed on some buildbots where the name was not anticipated. Make the test more robust by extracting the filename with Python and appending a line to the output. This is then captured into a FileCheck variable and used directly in the check for the executable name. Should fix buildbot failures caused by the merge of PR llvm#159129.

llvmbot · 2025-09-16T18:51:47Z

@llvm/pr-subscribers-clang-driver

@llvm/pr-subscribers-clang

Author: bd1976bris (bd1976bris)

Changes

The Clang driver tests tried to match the Clang executable name via a regular expression. This failed on some buildbots where the name was not anticipated.

Make the test more robust by extracting the filename with Python and appending a line to the output. This is then captured into a FileCheck variable and used directly in the check for the executable name.

Should fix buildbot failures caused by the merge of PR #159129.

Full diff: https://github.com/llvm/llvm-project/pull/159151.diff

3 Files Affected:

(modified) clang/test/Driver/DTLTO/dtlto.c (+15-11)
(added) clang/test/Driver/DTLTO/filename.py (+3)
(modified) clang/test/Driver/DTLTO/ps5-dtlto.c (+17-12)

diff --git a/clang/test/Driver/DTLTO/dtlto.c b/clang/test/Driver/DTLTO/dtlto.c
index 053955a9e3d4a..8f086584e6ba7 100644
--- a/clang/test/Driver/DTLTO/dtlto.c
+++ b/clang/test/Driver/DTLTO/dtlto.c
@@ -6,14 +6,16 @@
 /// Check DTLTO options are forwarded to the linker.
 
 /// Check that options are forwarded as expected with --thinlto-distributor=.
+// RUN: %python %S/filename.py %clang > %t_forward.log
 // RUN: %clang -flto=thin %s -### -fuse-ld=lld --target=x86_64-linux-gnu \
 // RUN:   -Xthinlto-distributor=a1 -Xthinlto-distributor=a2,a3 \
-// RUN:   -fthinlto-distributor=d.exe -Werror 2>&1 | \
-// RUN:   FileCheck %s --check-prefix=FORWARD
+// RUN:   -fthinlto-distributor=d.exe -Werror >>%t_forward.log 2>&1
+// RUN: FileCheck %s --input-file=%t_forward.log --check-prefix=FORWARD
 
+// FORWARD: filename.py:[[CLANG:.*]]
 // FORWARD: ld.lld
 // FORWARD-SAME: "--thinlto-distributor=d.exe"
-// FORWARD-SAME: "--thinlto-remote-compiler={{.*}}clang{{[^\"]*}}"
+// FORWARD-SAME: "--thinlto-remote-compiler={{.*}}[[CLANG]]"
 // FORWARD-SAME: "--thinlto-distributor-arg=a1"
 // FORWARD-SAME: "--thinlto-distributor-arg=a2"
 // FORWARD-SAME: "--thinlto-distributor-arg=a3"
@@ -22,8 +24,8 @@
 /// that a warning is issued for unused -Xthinlto-distributor options.
 // RUN: %clang -flto=thin %s -### -fuse-ld=lld --target=x86_64-linux-gnu \
 // RUN:   -Xthinlto-distributor=a1 -Xthinlto-distributor=a2,a3 2>&1 | \
-// RUN:   FileCheck %s --check-prefix=NODIST --implicit-check-not=distributor \
-// RUN:     --implicit-check-not=remote-compiler
+// RUN: FileCheck %s --check-prefix=NODIST --implicit-check-not=distributor \
+// RUN:   --implicit-check-not=remote-compiler
 
 // NODIST: warning: argument unused during compilation: '-Xthinlto-distributor=a1'
 // NODIST: warning: argument unused during compilation: '-Xthinlto-distributor=a2,a3'
@@ -31,10 +33,11 @@
 
 /// Check the expected arguments are forwarded by default with only
 /// --thinlto-distributor=.
+// RUN: %python %S/filename.py %clang > %t_default.log
 // RUN: %clang -flto=thin %s -### -fuse-ld=lld --target=x86_64-linux-gnu \
-// RUN:   -fthinlto-distributor=d.exe -Werror 2>&1 | \
-// RUN:   FileCheck %s --check-prefix=DEFAULT --implicit-check-not=distributor \
-// RUN:     --implicit-check-not=remote-compiler
+// RUN:   -fthinlto-distributor=d.exe -Werror >>%t_default.log 2>&1
+// RUN: FileCheck %s --input-file=%t_default.log --check-prefix=DEFAULT \
+// RUN:   --implicit-check-not=distributor --implicit-check-not=remote-compiler
 
 // DEFAULT: ld.lld
 // DEFAULT-SAME: "--thinlto-distributor=d.exe"
@@ -42,10 +45,11 @@
 
 /// Check that nothing is forwarded when the compiler is not in LTO mode, and that
 /// appropriate unused option warnings are issued.
+// RUN: %python %S/filename.py %clang > %t_noflto.log
 // RUN: %clang %s -### -fuse-ld=lld --target=x86_64-linux-gnu \
-// RUN:   -fthinlto-distributor=d.exe 2>&1 | \
-// RUN:   FileCheck %s --check-prefix=NOFLTO --implicit-check-not=distributor \
-// RUN:     --implicit-check-not=remote-compiler
+// RUN:   -fthinlto-distributor=d.exe  >>%t_noflto.log 2>&1
+// RUN: FileCheck %s --input-file=%t_noflto.log --check-prefix=NOFLTO \
+// RUN:   --implicit-check-not=distributor --implicit-check-not=remote-compiler
 
 // NOFLTO: warning: argument unused during compilation: '-fthinlto-distributor=d.exe'
 // NOFLTO: ld.lld
diff --git a/clang/test/Driver/DTLTO/filename.py b/clang/test/Driver/DTLTO/filename.py
new file mode 100644
index 0000000000000..6b6d483a2fd2a
--- /dev/null
+++ b/clang/test/Driver/DTLTO/filename.py
@@ -0,0 +1,3 @@
+from pathlib import Path
+import sys
+print(f"filename.py:{Path(sys.argv[1]).name}")
diff --git a/clang/test/Driver/DTLTO/ps5-dtlto.c b/clang/test/Driver/DTLTO/ps5-dtlto.c
index eb4691da9d2fc..b52765db5b1c7 100644
--- a/clang/test/Driver/DTLTO/ps5-dtlto.c
+++ b/clang/test/Driver/DTLTO/ps5-dtlto.c
@@ -6,14 +6,16 @@
 /// Check DTLTO options are forwarded to the linker.
 
 /// Check that options are forwarded as expected with --thinlto-distributor=.
+// RUN: %python %S/filename.py %clang > %t_forward.log
 // RUN: %clang -flto=thin %s -### --target=x86_64-sie-ps5 \
 // RUN:   -Xthinlto-distributor=a1 -Xthinlto-distributor=a2,a3 \
-// RUN:   -fthinlto-distributor=d.exe -Werror 2>&1 | \
-// RUN:   FileCheck %s --check-prefix=FORWARD
+// RUN:   -fthinlto-distributor=d.exe -Werror >>%t_forward.log 2>&1
+// RUN: FileCheck %s --input-file=%t_forward.log --check-prefix=FORWARD
 
+// FORWARD: filename.py:[[CLANG:.*]]
 // FORWARD: prospero-lld
 // FORWARD-SAME: "--thinlto-distributor=d.exe"
-// FORWARD-SAME: "--thinlto-remote-compiler={{.*}}clang{{[^\"]*}}"
+// FORWARD-SAME: "--thinlto-remote-compiler={{.*}}[[CLANG]]"
 // FORWARD-SAME: "--thinlto-distributor-arg=a1"
 // FORWARD-SAME: "--thinlto-distributor-arg=a2"
 // FORWARD-SAME: "--thinlto-distributor-arg=a3"
@@ -22,8 +24,8 @@
 /// that a warning is issued for unused -Xthinlto-distributor options.
 // RUN: %clang -flto=thin %s -### --target=x86_64-sie-ps5 \
 // RUN:   -Xthinlto-distributor=a1 -Xthinlto-distributor=a2,a3 2>&1 | \
-// RUN:   FileCheck %s --check-prefix=NODIST --implicit-check-not=distributor \
-// RUN:     --implicit-check-not=remote-compiler
+// RUN: FileCheck %s --check-prefix=NODIST --implicit-check-not=distributor \
+// RUN:   --implicit-check-not=remote-compiler
 
 // NODIST: warning: argument unused during compilation: '-Xthinlto-distributor=a1'
 // NODIST: warning: argument unused during compilation: '-Xthinlto-distributor=a2,a3'
@@ -31,18 +33,21 @@
 
 /// Check the expected arguments are forwarded by default with only
 /// --thinlto-distributor=.
+// RUN: %python %S/filename.py %clang > %t_default.log
 // RUN: %clang -flto=thin %s -### --target=x86_64-sie-ps5 \
-// RUN:   -fthinlto-distributor=d.exe -Werror 2>&1 | \
-// RUN:   FileCheck %s --check-prefix=DEFAULT --implicit-check-not=distributor \
-// RUN:     --implicit-check-not=remote-compiler
+// RUN:   -fthinlto-distributor=d.exe -Werror >>%t_default.log 2>&1
+// RUN: FileCheck %s --input-file=%t_default.log --check-prefix=DEFAULT \
+// RUN:   --implicit-check-not=distributor --implicit-check-not=remote-compiler
 
+// DEFAULT: filename.py:[[CLANG:.*]]
 // DEFAULT: prospero-lld
 // DEFAULT-SAME: "--thinlto-distributor=d.exe"
-// DEFAULT-SAME: "--thinlto-remote-compiler={{.*}}clang{{[^\"]*}}"
+// DEFAULT-SAME: "--thinlto-remote-compiler={{.*}}[[CLANG]]"
 
 /// Check that the arguments are forwarded unconditionally even when the
 /// compiler is not in LTO mode.
+// RUN: %python %S/filename.py %clang > %t_noflto.log
 // RUN: %clang %s -### --target=x86_64-sie-ps5 \
-// RUN:   -fthinlto-distributor=d.exe -Werror 2>&1 | \
-// RUN:   FileCheck %s --check-prefix=DEFAULT --implicit-check-not=distributor \
-// RUN:     --implicit-check-not=remote-compiler
+// RUN:   -fthinlto-distributor=d.exe -Werror >>%t_noflto.log 2>&1
+// RUN: FileCheck %s --input-file=%t_noflto.log --check-prefix=DEFAULT \
+// RUN:   --implicit-check-not=distributor --implicit-check-not=remote-compiler

github-actions · 2025-09-16T18:55:11Z

✅ With the latest revision this PR passed the Python code formatter.

jplehr · 2025-09-16T19:34:08Z

This appears to still break the testing. Can we please revert the original PR to get our bot back to green?

bd1976bris · 2025-09-16T19:56:17Z

Should fix buildbot failures caused by the merge of PR #159129.

It would involve reverting a number of commits. Can you approve #159158? @petrhosek approved the same commit (although with an incorrect description) earlier: #159050.

) Make the test regexes more permissive to fix buildbot failures caused by the merge of PR #159129. This mirrors the earlier fix in PR #148908. We retain cross-project-test coverage to verify that the path content is correct. A follow-up will update the tests to robustly check the Clang executable filename, likely along the lines of PR #159151. Short-term unbreak to keep the buildbots green without reverting a chain of commits.

jplehr · 2025-09-16T21:23:20Z

it seems that this needs rebasing.

bd1976bris · 2025-09-17T08:50:27Z

clang/test/Driver/DTLTO/dtlto.c


 // DEFAULT: ld.lld
 // DEFAULT-SAME: "--thinlto-distributor=d.exe"
 // DEFAULT-SAME: "--thinlto-remote-compiler={{[^"]+}}"


Rebasing via the GitHub GUI seems to have dropped this part of the change. We should be capturing and checking: "--thinlto-remote-compiler={{.*}}[[CLANG]]" as in the other cases. I don't expect this to cause a build bot breakage as the code we have ended up with here is a revert to the original code that has lived upstream for several weeks previous to the latest round of changes.

Done in: #159418.

petrhosek · 2025-09-17T16:35:45Z

This change broke our builders again:

XPASS: Clang :: Driver/DTLTO/ps5-dtlto.c (11550 of 22550)
 ******************** TEST 'Clang :: Driver/DTLTO/ps5-dtlto.c' FAILED ********************
 Exit Code: 0
 Command Output (stderr):
 --
 "/b/s/w/ir/cipd_bin_packages/cpython3/bin/python3.11" /b/s/w/ir/x/w/llvm-llvm-project/clang/test/Driver/DTLTO/filename.py /b/s/w/ir/x/w/llvm_build/bin/clang > /b/s/w/ir/x/w/llvm_build/tools/clang/test/Driver/DTLTO/Output/ps5-dtlto.c.tmp_forward.log # RUN: at line 9
 + /b/s/w/ir/cipd_bin_packages/cpython3/bin/python3.11 /b/s/w/ir/x/w/llvm-llvm-project/clang/test/Driver/DTLTO/filename.py /b/s/w/ir/x/w/llvm_build/bin/clang
 /b/s/w/ir/x/w/llvm_build/bin/clang -flto=thin /b/s/w/ir/x/w/llvm-llvm-project/clang/test/Driver/DTLTO/ps5-dtlto.c -### --target=x86_64-sie-ps5    -Xthinlto-distributor=a1 -Xthinlto-distributor=a2,a3    -fthinlto-distributor=d.exe -Werror >>/b/s/w/ir/x/w/llvm_build/tools/clang/test/Driver/DTLTO/Output/ps5-dtlto.c.tmp_forward.log 2>&1 # RUN: at line 10
 + /b/s/w/ir/x/w/llvm_build/bin/clang -flto=thin /b/s/w/ir/x/w/llvm-llvm-project/clang/test/Driver/DTLTO/ps5-dtlto.c -### --target=x86_64-sie-ps5 -Xthinlto-distributor=a1 -Xthinlto-distributor=a2,a3 -fthinlto-distributor=d.exe -Werror
 /b/s/w/ir/x/w/llvm_build/bin/FileCheck /b/s/w/ir/x/w/llvm-llvm-project/clang/test/Driver/DTLTO/ps5-dtlto.c --input-file=/b/s/w/ir/x/w/llvm_build/tools/clang/test/Driver/DTLTO/Output/ps5-dtlto.c.tmp_forward.log --check-prefix=FORWARD # RUN: at line 13
 + /b/s/w/ir/x/w/llvm_build/bin/FileCheck /b/s/w/ir/x/w/llvm-llvm-project/clang/test/Driver/DTLTO/ps5-dtlto.c --input-file=/b/s/w/ir/x/w/llvm_build/tools/clang/test/Driver/DTLTO/Output/ps5-dtlto.c.tmp_forward.log --check-prefix=FORWARD
 /b/s/w/ir/x/w/llvm_build/bin/clang -flto=thin /b/s/w/ir/x/w/llvm-llvm-project/clang/test/Driver/DTLTO/ps5-dtlto.c -### --target=x86_64-sie-ps5    -Xthinlto-distributor=a1 -Xthinlto-distributor=a2,a3 2>&1 |  /b/s/w/ir/x/w/llvm_build/bin/FileCheck /b/s/w/ir/x/w/llvm-llvm-project/clang/test/Driver/DTLTO/ps5-dtlto.c --check-prefix=NODIST --implicit-check-not=distributor    --implicit-check-not=remote-compiler # RUN: at line 25
 + /b/s/w/ir/x/w/llvm_build/bin/clang -flto=thin /b/s/w/ir/x/w/llvm-llvm-project/clang/test/Driver/DTLTO/ps5-dtlto.c -### --target=x86_64-sie-ps5 -Xthinlto-distributor=a1 -Xthinlto-distributor=a2,a3
 + /b/s/w/ir/x/w/llvm_build/bin/FileCheck /b/s/w/ir/x/w/llvm-llvm-project/clang/test/Driver/DTLTO/ps5-dtlto.c --check-prefix=NODIST --implicit-check-not=distributor --implicit-check-not=remote-compiler
 "/b/s/w/ir/cipd_bin_packages/cpython3/bin/python3.11" /b/s/w/ir/x/w/llvm-llvm-project/clang/test/Driver/DTLTO/filename.py /b/s/w/ir/x/w/llvm_build/bin/clang > /b/s/w/ir/x/w/llvm_build/tools/clang/test/Driver/DTLTO/Output/ps5-dtlto.c.tmp_default.log # RUN: at line 36
 + /b/s/w/ir/cipd_bin_packages/cpython3/bin/python3.11 /b/s/w/ir/x/w/llvm-llvm-project/clang/test/Driver/DTLTO/filename.py /b/s/w/ir/x/w/llvm_build/bin/clang
 /b/s/w/ir/x/w/llvm_build/bin/clang -flto=thin /b/s/w/ir/x/w/llvm-llvm-project/clang/test/Driver/DTLTO/ps5-dtlto.c -### --target=x86_64-sie-ps5    -fthinlto-distributor=d.exe -Werror >>/b/s/w/ir/x/w/llvm_build/tools/clang/test/Driver/DTLTO/Output/ps5-dtlto.c.tmp_default.log 2>&1 # RUN: at line 37
 + /b/s/w/ir/x/w/llvm_build/bin/clang -flto=thin /b/s/w/ir/x/w/llvm-llvm-project/clang/test/Driver/DTLTO/ps5-dtlto.c -### --target=x86_64-sie-ps5 -fthinlto-distributor=d.exe -Werror
 /b/s/w/ir/x/w/llvm_build/bin/FileCheck /b/s/w/ir/x/w/llvm-llvm-project/clang/test/Driver/DTLTO/ps5-dtlto.c --input-file=/b/s/w/ir/x/w/llvm_build/tools/clang/test/Driver/DTLTO/Output/ps5-dtlto.c.tmp_default.log --check-prefix=DEFAULT    --implicit-check-not=distributor --implicit-check-not=remote-compiler # RUN: at line 39
 + /b/s/w/ir/x/w/llvm_build/bin/FileCheck /b/s/w/ir/x/w/llvm-llvm-project/clang/test/Driver/DTLTO/ps5-dtlto.c --input-file=/b/s/w/ir/x/w/llvm_build/tools/clang/test/Driver/DTLTO/Output/ps5-dtlto.c.tmp_default.log --check-prefix=DEFAULT --implicit-check-not=distributor --implicit-check-not=remote-compiler
 "/b/s/w/ir/cipd_bin_packages/cpython3/bin/python3.11" /b/s/w/ir/x/w/llvm-llvm-project/clang/test/Driver/DTLTO/filename.py /b/s/w/ir/x/w/llvm_build/bin/clang > /b/s/w/ir/x/w/llvm_build/tools/clang/test/Driver/DTLTO/Output/ps5-dtlto.c.tmp_noflto.log # RUN: at line 49
 + /b/s/w/ir/cipd_bin_packages/cpython3/bin/python3.11 /b/s/w/ir/x/w/llvm-llvm-project/clang/test/Driver/DTLTO/filename.py /b/s/w/ir/x/w/llvm_build/bin/clang
 /b/s/w/ir/x/w/llvm_build/bin/clang /b/s/w/ir/x/w/llvm-llvm-project/clang/test/Driver/DTLTO/ps5-dtlto.c -### --target=x86_64-sie-ps5    -fthinlto-distributor=d.exe -Werror >>/b/s/w/ir/x/w/llvm_build/tools/clang/test/Driver/DTLTO/Output/ps5-dtlto.c.tmp_noflto.log 2>&1 # RUN: at line 50
 + /b/s/w/ir/x/w/llvm_build/bin/clang /b/s/w/ir/x/w/llvm-llvm-project/clang/test/Driver/DTLTO/ps5-dtlto.c -### --target=x86_64-sie-ps5 -fthinlto-distributor=d.exe -Werror
 /b/s/w/ir/x/w/llvm_build/bin/FileCheck /b/s/w/ir/x/w/llvm-llvm-project/clang/test/Driver/DTLTO/ps5-dtlto.c --input-file=/b/s/w/ir/x/w/llvm_build/tools/clang/test/Driver/DTLTO/Output/ps5-dtlto.c.tmp_noflto.log --check-prefix=DEFAULT    --implicit-check-not=distributor --implicit-check-not=remote-compiler # RUN: at line 52
 + /b/s/w/ir/x/w/llvm_build/bin/FileCheck /b/s/w/ir/x/w/llvm-llvm-project/clang/test/Driver/DTLTO/ps5-dtlto.c --input-file=/b/s/w/ir/x/w/llvm_build/tools/clang/test/Driver/DTLTO/Output/ps5-dtlto.c.tmp_noflto.log --check-prefix=DEFAULT --implicit-check-not=distributor --implicit-check-not=remote-compiler
 --
 ********************

Looks like we need to remove the XFAIL that was added in #159129?

DTLTO is still incompatible with llvm-driver, but the test started passing after llvm#159151.

Remove XFAILs for Multicall. DTLTO is still incompatible with llvm-driver, but these tests now pass after llvm#159151. Modify a missed regex to use filename.py (missed in llvm#159151). Tighten overly greedy regexes to prevent spurious failures.

Remove XFAILs for llvm-driver. DTLTO is still incompatible with llvm-driver, but these tests now pass after #159151. Modify a missed regex to use filename.py (missed in #159151). Tighten overly greedy regexes to prevent spurious failures.

llvmbot added clang Clang issues not falling into any other category clang:driver 'clang' and 'clang++' user-facing binaries. Not 'clang-cl' labels Sep 16, 2025

Format python with black

eb35d15

Add resolving of symlinks

8631e6c

bd1976bris mentioned this pull request Sep 16, 2025

[DTLTO][TEST] Get the DTLTO Clang driver tests failing on some buildbots to pass #159158

Merged

bd1976bris requested a review from nga888 September 16, 2025 20:06

Merge branch 'main' into get-clang-with-py-clang-dtlto-tests

f4829ed

bd1976bris merged commit 2ef58b6 into llvm:main Sep 17, 2025
7 of 9 checks passed

bd1976bris commented Sep 17, 2025

View reviewed changes

petrhosek mentioned this pull request Sep 17, 2025

[DTLTO] Remove XFAIL for llvm-driver #159413

Open

petrhosek added a commit to petrhosek/llvm-project that referenced this pull request Sep 17, 2025

[DTLTO] Remove XFAIL for llvm-driver

bd5cbc4

DTLTO is still incompatible with llvm-driver, but the test started passing after llvm#159151.

bd1976bris mentioned this pull request Sep 17, 2025

[DTLTO][TEST] Make Clang driver tests even more robust #159418

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