[llvm-branch-commits] [llvm] f9a27df - [FileCheck] Enforce --allow-unused-prefixes=false for llvm/test/Transforms
Mircea Trofin via llvm-branch-commits
llvm-branch-commits at lists.llvm.org
Wed Dec 9 08:56:04 PST 2020
Author: Mircea Trofin
Date: 2020-12-09T08:51:38-08:00
New Revision: f9a27df16bc4c86eb9c81b0fed3d263876334572
URL: https://github.com/llvm/llvm-project/commit/f9a27df16bc4c86eb9c81b0fed3d263876334572
DIFF: https://github.com/llvm/llvm-project/commit/f9a27df16bc4c86eb9c81b0fed3d263876334572.diff
LOG: [FileCheck] Enforce --allow-unused-prefixes=false for llvm/test/Transforms
Explicitly opt-out llvm/test/Transforms/Attributor.
Verified by flipping the default value of allow-unused-prefixes and
observing that none of the failures were under llvm/test/Transforms.
Differential Revision: https://reviews.llvm.org/D92404
Added:
llvm/test/Transforms/Attributor/lit.local.cfg
llvm/test/Transforms/lit.local.cfg
Modified:
llvm/test/Transforms/ArgumentPromotion/crash.ll
llvm/test/Transforms/HardwareLoops/scalar-while.ll
llvm/test/Transforms/Inline/inline_stats.ll
llvm/test/Transforms/Inline/noalias2.ll
llvm/test/Transforms/LICM/pr23608.ll
llvm/test/Transforms/LoadStoreVectorizer/AMDGPU/merge-stores-private.ll
llvm/test/Transforms/LoopIdiom/X86/left-shift-until-bittest.ll
llvm/test/Transforms/LoopStrengthReduce/X86/lsr-insns-1.ll
llvm/test/Transforms/LowerTypeTests/export-inline.ll
llvm/test/Transforms/MemCpyOpt/memcpy-invoke-memcpy.ll
llvm/test/Transforms/PhaseOrdering/ARM/arm_fill_q7.ll
llvm/test/Transforms/PhaseOrdering/X86/loop-idiom-vs-indvars.ll
llvm/test/lit.cfg.py
Removed:
################################################################################
diff --git a/llvm/test/Transforms/ArgumentPromotion/crash.ll b/llvm/test/Transforms/ArgumentPromotion/crash.ll
index d79d906434bb..d55f4624e0c3 100644
--- a/llvm/test/Transforms/ArgumentPromotion/crash.ll
+++ b/llvm/test/Transforms/ArgumentPromotion/crash.ll
@@ -1,5 +1,5 @@
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --function-signature --scrub-attributes
-; RUN: opt -S < %s -inline -argpromotion | FileCheck %s --check-prefixes=ARGPROMOTION,ALL_OLDPM
+; RUN: opt -S < %s -inline -argpromotion | FileCheck %s --check-prefix=ARGPROMOTION
; RUN: opt -S < %s -passes=inline,argpromotion | FileCheck %s --check-prefixes=ARGPROMOTION,ALL_NEWPM
%S = type { %S* }
diff --git a/llvm/test/Transforms/Attributor/lit.local.cfg b/llvm/test/Transforms/Attributor/lit.local.cfg
new file mode 100644
index 000000000000..fad1a46e1d0f
--- /dev/null
+++ b/llvm/test/Transforms/Attributor/lit.local.cfg
@@ -0,0 +1,11 @@
+# -*- Python -*- vim: set ft=python ts=4 sw=4 expandtab tw=79:
+from lit.llvm.subst import ToolSubst
+
+fc = ToolSubst('FileCheck', unresolved='fatal')
+# the parent introduced the opposite rule, so we replace it if we see it.
+if len(config.substitutions) > 0 and config.substitutions[0] == (fc.regex, 'FileCheck --allow-unused-prefixes=false'):
+ config.substitutions[0] = (
+ fc.regex, 'FileCheck --allow-unused-prefixes=true')
+else:
+ config.substitutions.insert(0, (fc.regex,
+ 'FileCheck --allow-unused-prefixes=true'))
diff --git a/llvm/test/Transforms/HardwareLoops/scalar-while.ll b/llvm/test/Transforms/HardwareLoops/scalar-while.ll
index fb614ea275a0..0b99f74f0d98 100644
--- a/llvm/test/Transforms/HardwareLoops/scalar-while.ll
+++ b/llvm/test/Transforms/HardwareLoops/scalar-while.ll
@@ -1,9 +1,9 @@
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
-; RUN: opt -hardware-loops -force-hardware-loops=true -hardware-loop-decrement=1 -hardware-loop-counter-bitwidth=32 -S %s -o - | FileCheck %s --check-prefixes=CHECK,CHECK-DEC
-; RUN: opt -hardware-loops -force-hardware-loops=true -hardware-loop-decrement=1 -hardware-loop-counter-bitwidth=32 -force-hardware-loop-phi=true -S %s -o - | FileCheck %s --check-prefixes=CHECK,CHECK-PHI
-; RUN: opt -hardware-loops -force-hardware-loops=true -hardware-loop-decrement=1 -hardware-loop-counter-bitwidth=32 -force-nested-hardware-loop=true -S %s -o - | FileCheck %s --check-prefixes=CHECK,CHECK-NESTED
-; RUN: opt -hardware-loops -force-hardware-loops=true -hardware-loop-decrement=1 -hardware-loop-counter-bitwidth=32 -force-hardware-loop-guard=true -S %s -o - | FileCheck %s --check-prefixes=CHECK,CHECK-GUARD
-; RUN: opt -hardware-loops -force-hardware-loops=true -hardware-loop-decrement=1 -hardware-loop-counter-bitwidth=32 -force-hardware-loop-phi=true -force-hardware-loop-guard=true -S %s -o - | FileCheck %s --check-prefixes=CHECK,CHECK-PHIGUARD
+; RUN: opt -hardware-loops -force-hardware-loops=true -hardware-loop-decrement=1 -hardware-loop-counter-bitwidth=32 -S %s -o - | FileCheck %s --check-prefix=CHECK-DEC
+; RUN: opt -hardware-loops -force-hardware-loops=true -hardware-loop-decrement=1 -hardware-loop-counter-bitwidth=32 -force-hardware-loop-phi=true -S %s -o - | FileCheck %s --check-prefix=CHECK-PHI
+; RUN: opt -hardware-loops -force-hardware-loops=true -hardware-loop-decrement=1 -hardware-loop-counter-bitwidth=32 -force-nested-hardware-loop=true -S %s -o - | FileCheck %s --check-prefix=CHECK-NESTED
+; RUN: opt -hardware-loops -force-hardware-loops=true -hardware-loop-decrement=1 -hardware-loop-counter-bitwidth=32 -force-hardware-loop-guard=true -S %s -o - | FileCheck %s --check-prefix=CHECK-GUARD
+; RUN: opt -hardware-loops -force-hardware-loops=true -hardware-loop-decrement=1 -hardware-loop-counter-bitwidth=32 -force-hardware-loop-phi=true -force-hardware-loop-guard=true -S %s -o - | FileCheck %s --check-prefix=CHECK-PHIGUARD
define void @while_lt(i32 %i, i32 %N, i32* nocapture %A) {
; CHECK-DEC-LABEL: @while_lt(
diff --git a/llvm/test/Transforms/Inline/inline_stats.ll b/llvm/test/Transforms/Inline/inline_stats.ll
index 3010b5642815..60110e88817d 100644
--- a/llvm/test/Transforms/Inline/inline_stats.ll
+++ b/llvm/test/Transforms/Inline/inline_stats.ll
@@ -1,16 +1,16 @@
; First with legacy PM
-; RUN: opt -S -inline -inliner-function-import-stats=basic < %s 2>&1 | FileCheck %s -check-prefix=CHECK-BASIC -check-prefix=CHECK
-; RUN: opt -S -inline -inliner-function-import-stats=verbose < %s 2>&1 | FileCheck %s -check-prefix="CHECK-VERBOSE" -check-prefix=CHECK
+; RUN: opt -S -inline -inliner-function-import-stats=basic < %s 2>&1 | FileCheck %s --check-prefixes=CHECK-BASIC,CHECK
+; RUN: opt -S -inline -inliner-function-import-stats=verbose < %s 2>&1 | FileCheck %s --check-prefixes="CHECK-VERBOSE",CHECK
; Do again with new PM
-; RUN: opt -S -passes=inline -inliner-function-import-stats=basic < %s 2>&1 | FileCheck %s -check-prefix=CHECK-BASIC -check-prefix=CHECK
-; RUN: opt -S -passes=inline -inliner-function-import-stats=verbose < %s 2>&1 | FileCheck %s -check-prefix="CHECK-VERBOSE" -check-prefix=CHECK
+; RUN: opt -S -passes=inline -inliner-function-import-stats=basic < %s 2>&1 | FileCheck %s --check-prefixes=CHECK-BASIC,CHECK
+; RUN: opt -S -passes=inline -inliner-function-import-stats=verbose < %s 2>&1 | FileCheck %s --check-prefixes="CHECK-VERBOSE",CHECK
-; RUN: opt -S -passes=inliner-wrapper -inliner-function-import-stats=basic < %s 2>&1 | FileCheck %s -check-prefix=CHECK-BASIC -check-prefix=CHECK
-; RUN: opt -S -passes=inliner-wrapper -inliner-function-import-stats=verbose < %s 2>&1 | FileCheck %s -check-prefix="CHECK-VERBOSE" -check-prefix=CHECK
+; RUN: opt -S -passes=inliner-wrapper -inliner-function-import-stats=basic < %s 2>&1 | FileCheck %s --check-prefixes=CHECK-BASIC,CHECK
+; RUN: opt -S -passes=inliner-wrapper -inliner-function-import-stats=verbose < %s 2>&1 | FileCheck %s --check-prefixes="CHECK-VERBOSE",CHECK
-; RUN: opt -S -passes=always-inliner-wrapper,inliner-wrapper -inliner-function-import-stats=basic < %s 2>&1 | FileCheck %s -check-prefix=WRAPPER-BASIC -check-prefix=WRAPPER
-; RUN: opt -S -passes=always-inliner-wrapper,inliner-wrapper -inliner-function-import-stats=verbose < %s 2>&1 | FileCheck %s -check-prefix=WRAPPER-VERBOSE -check-prefix=WRAPPER
+; RUN: opt -S -passes=always-inliner-wrapper,inliner-wrapper -inliner-function-import-stats=basic < %s 2>&1 | FileCheck %s -check-prefix=WRAPPER
+; RUN: opt -S -passes=always-inliner-wrapper,inliner-wrapper -inliner-function-import-stats=verbose < %s 2>&1 | FileCheck %s --check-prefixes=WRAPPER-VERBOSE,WRAPPER
; CHECK: ------- Dumping inliner stats for [<stdin>] -------
; CHECK-BASIC-NOT: -- List of inlined functions:
diff --git a/llvm/test/Transforms/Inline/noalias2.ll b/llvm/test/Transforms/Inline/noalias2.ll
index f2b57e90eb5d..59809379c2e5 100644
--- a/llvm/test/Transforms/Inline/noalias2.ll
+++ b/llvm/test/Transforms/Inline/noalias2.ll
@@ -1,6 +1,6 @@
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --function-signature
; RUN: opt -inline -enable-noalias-to-md-conversion -S < %s | FileCheck %s --check-prefixes=CHECK,NO_ASSUME
-; RUN: opt -inline -enable-noalias-to-md-conversion --enable-knowledge-retention -S < %s | FileCheck %s --check-prefixes=CHECK,USE_ASSUME
+; RUN: opt -inline -enable-noalias-to-md-conversion --enable-knowledge-retention -S < %s | FileCheck %s
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
diff --git a/llvm/test/Transforms/LICM/pr23608.ll b/llvm/test/Transforms/LICM/pr23608.ll
index 6422779123ae..8d1c20bfbc7a 100644
--- a/llvm/test/Transforms/LICM/pr23608.ll
+++ b/llvm/test/Transforms/LICM/pr23608.ll
@@ -1,6 +1,6 @@
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
-; RUN: opt -S -licm %s | FileCheck %s --check-prefixes=CHECK,NO_ASSUME
-; RUN: opt -S -licm --enable-knowledge-retention %s | FileCheck %s --check-prefixes=CHECK,USE_ASSUME
+; RUN: opt -S -licm %s | FileCheck %s --check-prefix=NO_ASSUME
+; RUN: opt -S -licm --enable-knowledge-retention %s | FileCheck %s --check-prefix=USE_ASSUME
; ModuleID = '../pr23608.ll'
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
diff --git a/llvm/test/Transforms/LoadStoreVectorizer/AMDGPU/merge-stores-private.ll b/llvm/test/Transforms/LoadStoreVectorizer/AMDGPU/merge-stores-private.ll
index 31a1c270bd0e..96ae98d7040c 100644
--- a/llvm/test/Transforms/LoadStoreVectorizer/AMDGPU/merge-stores-private.ll
+++ b/llvm/test/Transforms/LoadStoreVectorizer/AMDGPU/merge-stores-private.ll
@@ -1,6 +1,6 @@
; RUN: opt -mtriple=amdgcn-amd-amdhsa -mattr=+max-private-element-size-4,-unaligned-scratch-access -load-store-vectorizer -S -o - %s | FileCheck -check-prefixes=ELT4,ELT4-ALIGNED,ALIGNED,ALL %s
-; RUN: opt -mtriple=amdgcn-amd-amdhsa -mattr=+max-private-element-size-8,-unaligned-scratch-access -load-store-vectorizer -S -o - %s | FileCheck -check-prefixes=ELT8,ELT8-ALIGNED,ALIGNED,ALL %s
-; RUN: opt -mtriple=amdgcn-amd-amdhsa -mattr=+max-private-element-size-16,-unaligned-scratch-access -load-store-vectorizer -S -o - %s | FileCheck -check-prefixes=ELT16,ELT16-ALIGNED,ALIGNED,ALL %s
+; RUN: opt -mtriple=amdgcn-amd-amdhsa -mattr=+max-private-element-size-8,-unaligned-scratch-access -load-store-vectorizer -S -o - %s | FileCheck -check-prefixes=ELT8,ALIGNED,ALL %s
+; RUN: opt -mtriple=amdgcn-amd-amdhsa -mattr=+max-private-element-size-16,-unaligned-scratch-access -load-store-vectorizer -S -o - %s | FileCheck -check-prefixes=ELT16,ALIGNED,ALL %s
; RUN: opt -mtriple=amdgcn-amd-amdhsa -mattr=+max-private-element-size-4,+unaligned-scratch-access -load-store-vectorizer -S -o - %s | FileCheck -check-prefixes=ELT4,ELT4-UNALIGNED,UNALIGNED,ALL %s
; RUN: opt -mtriple=amdgcn-amd-amdhsa -mattr=+max-private-element-size-8,+unaligned-scratch-access -load-store-vectorizer -S -o - %s | FileCheck -check-prefixes=ELT8,ELT8-UNALIGNED,UNALIGNED,ALL %s
; RUN: opt -mtriple=amdgcn-amd-amdhsa -mattr=+max-private-element-size-16,+unaligned-scratch-access -load-store-vectorizer -S -o - %s | FileCheck -check-prefixes=ELT16,ELT16-UNALIGNED,UNALIGNED,ALL %s
diff --git a/llvm/test/Transforms/LoopIdiom/X86/left-shift-until-bittest.ll b/llvm/test/Transforms/LoopIdiom/X86/left-shift-until-bittest.ll
index 20b7a5cf0d75..65c730955333 100644
--- a/llvm/test/Transforms/LoopIdiom/X86/left-shift-until-bittest.ll
+++ b/llvm/test/Transforms/LoopIdiom/X86/left-shift-until-bittest.ll
@@ -1,6 +1,6 @@
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
-; RUN: opt -debugify -loop-idiom -mtriple=x86_64 -mcpu=core-avx2 < %s -S | FileCheck -check-prefixes=ALL,LZCNT %s
-; RUN: opt -debugify -loop-idiom -mtriple=x86_64 -mcpu=corei7 < %s -S | FileCheck -check-prefixes=ALL,NOLZCNT %s
+; RUN: opt -debugify -loop-idiom -mtriple=x86_64 -mcpu=core-avx2 < %s -S | FileCheck --check-prefix=ALL %s
+; RUN: opt -debugify -loop-idiom -mtriple=x86_64 -mcpu=corei7 < %s -S | FileCheck --check-prefix=ALL %s
declare i32 @gen32()
declare void @use32(i32)
diff --git a/llvm/test/Transforms/LoopStrengthReduce/X86/lsr-insns-1.ll b/llvm/test/Transforms/LoopStrengthReduce/X86/lsr-insns-1.ll
index b96dc62a29f6..33533f32c04a 100644
--- a/llvm/test/Transforms/LoopStrengthReduce/X86/lsr-insns-1.ll
+++ b/llvm/test/Transforms/LoopStrengthReduce/X86/lsr-insns-1.ll
@@ -1,7 +1,6 @@
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
-; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
-; RUN: opt < %s -loop-reduce -mtriple=x86_64 -S | FileCheck %s -check-prefix=BOTH -check-prefix=INSN
-; RUN: opt < %s -loop-reduce -mtriple=x86_64 -lsr-insns-cost=false -S | FileCheck %s -check-prefix=BOTH -check-prefix=REGS
+; RUN: opt < %s -loop-reduce -mtriple=x86_64 -S | FileCheck %s -check-prefix=INSN
+; RUN: opt < %s -loop-reduce -mtriple=x86_64 -lsr-insns-cost=false -S | FileCheck %s -check-prefix=REGS
; RUN: llc < %s -O2 -mtriple=x86_64-unknown-unknown -lsr-insns-cost | FileCheck %s
; OPT test checks that LSR optimize compare for static counter to compare with 0.
diff --git a/llvm/test/Transforms/LowerTypeTests/export-inline.ll b/llvm/test/Transforms/LowerTypeTests/export-inline.ll
index 54e0d42c33c5..b481a8bce96d 100644
--- a/llvm/test/Transforms/LowerTypeTests/export-inline.ll
+++ b/llvm/test/Transforms/LowerTypeTests/export-inline.ll
@@ -1,7 +1,7 @@
-; RUN: opt -mtriple=x86_64-unknown-linux -S -lowertypetests -lowertypetests-summary-action=export -lowertypetests-read-summary=%S/Inputs/use-typeid1-typeid2.yaml -lowertypetests-write-summary=%t < %s | FileCheck --check-prefixes=CHECK,X86 %s
+; RUN: opt -mtriple=x86_64-unknown-linux -S -lowertypetests -lowertypetests-summary-action=export -lowertypetests-read-summary=%S/Inputs/use-typeid1-typeid2.yaml -lowertypetests-write-summary=%t < %s | FileCheck --check-prefix=CHECK %s
; RUN: FileCheck --check-prefixes=SUMMARY,SUMMARY-X86 %s < %t
-; RUN: opt -mtriple=aarch64-unknown-linux -S -lowertypetests -lowertypetests-summary-action=export -lowertypetests-read-summary=%S/Inputs/use-typeid1-typeid2.yaml -lowertypetests-write-summary=%t < %s | FileCheck --check-prefixes=CHECK,ARM %s
+; RUN: opt -mtriple=aarch64-unknown-linux -S -lowertypetests -lowertypetests-summary-action=export -lowertypetests-read-summary=%S/Inputs/use-typeid1-typeid2.yaml -lowertypetests-write-summary=%t < %s | FileCheck --check-prefix=CHECK %s
; RUN: FileCheck --check-prefixes=SUMMARY,SUMMARY-ARM %s < %t
@foo = constant [2048 x i8] zeroinitializer, !type !0, !type !1, !type !2, !type !3
diff --git a/llvm/test/Transforms/MemCpyOpt/memcpy-invoke-memcpy.ll b/llvm/test/Transforms/MemCpyOpt/memcpy-invoke-memcpy.ll
index 204a71e29045..5d9650491721 100644
--- a/llvm/test/Transforms/MemCpyOpt/memcpy-invoke-memcpy.ll
+++ b/llvm/test/Transforms/MemCpyOpt/memcpy-invoke-memcpy.ll
@@ -1,6 +1,6 @@
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
-; RUN: opt < %s -memcpyopt -S -enable-memcpyopt-memoryssa=0 | FileCheck %s --check-prefixes=CHECK,NO_MSSA
-; RUN: opt < %s -memcpyopt -S -enable-memcpyopt-memoryssa=1 -verify-memoryssa | FileCheck %s --check-prefixes=CHECK,MSSA
+; RUN: opt < %s -memcpyopt -S -enable-memcpyopt-memoryssa=0 | FileCheck %s --check-prefix=NO_MSSA
+; RUN: opt < %s -memcpyopt -S -enable-memcpyopt-memoryssa=1 -verify-memoryssa | FileCheck %s --check-prefix=MSSA
; Test memcpy-memcpy dependencies across invoke edges.
diff --git a/llvm/test/Transforms/PhaseOrdering/ARM/arm_fill_q7.ll b/llvm/test/Transforms/PhaseOrdering/ARM/arm_fill_q7.ll
index dc5d363400b9..1d752bf82bf7 100644
--- a/llvm/test/Transforms/PhaseOrdering/ARM/arm_fill_q7.ll
+++ b/llvm/test/Transforms/PhaseOrdering/ARM/arm_fill_q7.ll
@@ -1,6 +1,6 @@
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
-; RUN: opt < %s -O3 -S | FileCheck -check-prefixes=ALL,OLDPM %s
-; RUN: opt < %s -passes='default<O3>' -aa-pipeline=default -S | FileCheck -check-prefixes=ALL,NEWPM %s
+; RUN: opt < %s -O3 -S | FileCheck --check-prefix=OLDPM %s
+; RUN: opt < %s -passes='default<O3>' -aa-pipeline=default -S | FileCheck --check-prefix=NEWPM %s
target datalayout = "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64"
target triple = "thumbv6m-none-none-eabi"
diff --git a/llvm/test/Transforms/PhaseOrdering/X86/loop-idiom-vs-indvars.ll b/llvm/test/Transforms/PhaseOrdering/X86/loop-idiom-vs-indvars.ll
index c06342d6022a..c2597ce29459 100644
--- a/llvm/test/Transforms/PhaseOrdering/X86/loop-idiom-vs-indvars.ll
+++ b/llvm/test/Transforms/PhaseOrdering/X86/loop-idiom-vs-indvars.ll
@@ -1,6 +1,6 @@
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
-; RUN: opt -mcpu=core-avx2 < %s -O3 -S | FileCheck -check-prefixes=ALL,OLDPM %s
-; RUN: opt -mcpu=core-avx2 < %s -passes='default<O3>' -aa-pipeline=default -S | FileCheck -check-prefixes=ALL,NEWPM %s
+; RUN: opt -mcpu=core-avx2 < %s -O3 -S | FileCheck --check-prefix=ALL %s
+; RUN: opt -mcpu=core-avx2 < %s -passes='default<O3>' -aa-pipeline=default -S | FileCheck --check-prefix=ALL %s
; Not only should we be able to make the loop countable,
; %whatever.next recurrence should be rewritten, making loop dead.
diff --git a/llvm/test/Transforms/lit.local.cfg b/llvm/test/Transforms/lit.local.cfg
new file mode 100644
index 000000000000..0a317f9a9ff9
--- /dev/null
+++ b/llvm/test/Transforms/lit.local.cfg
@@ -0,0 +1,8 @@
+# -*- Python -*- vim: set ft=python ts=4 sw=4 expandtab tw=79:
+from lit.llvm.subst import ToolSubst
+
+fc = ToolSubst('FileCheck', unresolved='fatal')
+# Insert this first. Then, we'll first update the blank FileCheck command; then,
+# the default substitution of FileCheck will replace it to its full path.
+config.substitutions.insert(0, (fc.regex,
+ 'FileCheck --allow-unused-prefixes=false'))
diff --git a/llvm/test/lit.cfg.py b/llvm/test/lit.cfg.py
index 991837a1d7d1..2fb5d021d0fc 100644
--- a/llvm/test/lit.cfg.py
+++ b/llvm/test/lit.cfg.py
@@ -82,6 +82,10 @@ def get_asan_rtlib():
return ''
return found_dylibs[0]
+# Define this first. Afterwards, use_default_substitutions will add the rule for
+# expanding FileCheck to the full path.
+config.substitutions.append(('%FileCheckWithUnusedPrefixes%',
+ 'FileCheck --allow-unused-prefixes=true'))
llvm_config.use_default_substitutions()
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