[llvm] r308069 - [libFuzzer] Allow non-fuzzer args after -ignore_remaining_args=1
Reid Kleckner via llvm-commits
llvm-commits at lists.llvm.org
Wed Jul 19 15:59:44 PDT 2017
So, kcc explicitly preferred the approach of hiding the exports in the
CMakeLists.txt file in https://reviews.llvm.org/D29752. Maybe we want to
revisit that?
On Wed, Jul 19, 2017 at 3:57 PM, Reid Kleckner <rnk at google.com> wrote:
> I debugged this, and discovered something heinous. Basically, all the
> LLVMFuzzer* hooks need to be marked export. On Linux, symbols appear in
> shared objects by default (it's called default visibility). This isn't true
> on Windows. Imagine that all objects are compiled with -fvisibility=hidden.
> So, we need to export the symbols. How do the existing lib/Fuzzer tests do
> this? In CMake! See test/CMakeLists.txt:
>
> function(test_export_symbol target symbol)
> if(MSVC)
> set_target_properties(LLVMFuzzer-${target} PROPERTIES LINK_FLAGS
> "-export:${symbol}")
> endif()
> endfunction()
> test_export_symbol(InitializeTest "LLVMFuzzerInitialize")
> test_export_symbol(BogusInitializeTest "LLVMFuzzerInitialize")
> test_export_symbol(CustomCrossOverTest "LLVMFuzzerCustomCrossOver")
> test_export_symbol(CustomMutatorTest "LLVMFuzzerCustomMutator")
>
> I think we should move this to ifdefs in the test source. Sound good? I
> will post a patch.
>
> On Mon, Jul 17, 2017 at 5:58 PM, Kostya Serebryany <kcc at google.com> wrote:
>
>> Let me add
>> UNSUPPORTED: windows
>>
>> On Mon, Jul 17, 2017 at 5:50 PM, Reid Kleckner <rnk at google.com> wrote:
>>
>>> I didn't have time to get to this today. I can look at it tomorrow. In
>>> the meantime, can somebody XFAIL this?
>>>
>>> On Mon, Jul 17, 2017 at 5:34 PM, Kostya Serebryany <kcc at google.com>
>>> wrote:
>>>
>>>> +rnk
>>>>
>>>> On Mon, Jul 17, 2017 at 12:25 PM, Justin Bogner <mail at justinbogner.com>
>>>> wrote:
>>>>
>>>>> The output on the bot isn't terribly informative and I don't have a
>>>>> windows machine. Could somebody run the failing command for me and
>>>>> paste
>>>>> the output? It's as follows:
>>>>>
>>>>> "LLVMFuzzer-FlagsTest" "--foo-bar" "-runs=10"
>>>>> "-ignore_remaining_args=1" "--baz" "-help=1" "test"
>>>>>
>>>>> Kostya Serebryany <kcc at google.com> writes:
>>>>> > This broke libFuzzer on Windows:
>>>>> > http://lab.llvm.org:8011/builders/sanitizer-windows/builds/1
>>>>> 4306/steps/run%20fuzzer%20tests/logs/stdio
>>>>> > I may not have time to look at this today, sadly.
>>>>> >
>>>>> > FAIL: LLVMFuzzer :: fuzzer-flags.test (14 of 92)
>>>>> > ******************** TEST 'LLVMFuzzer :: fuzzer-flags.test' FAILED
>>>>> > ********************
>>>>> > Script:
>>>>> > --
>>>>> > LLVMFuzzer-FlagsTest -foo_bar=1 2>&1 | FileCheck
>>>>> > C:\b\slave\sanitizer-windows\llvm\lib\Fuzzer\test\fuzzer-flags.test
>>>>> > --check-prefix=FOO_BAR
>>>>> > LLVMFuzzer-FlagsTest -runs=10 --max_len=100 2>&1 | FileCheck
>>>>> > C:\b\slave\sanitizer-windows\llvm\lib\Fuzzer\test\fuzzer-flags.test
>>>>> > --check-prefix=DASH_DASH
>>>>> > LLVMFuzzer-FlagsTest -help=1 2>&1 | FileCheck
>>>>> > C:\b\slave\sanitizer-windows\llvm\lib\Fuzzer\test\fuzzer-flags.test
>>>>> > --check-prefix=NO_INTERNAL
>>>>> > LLVMFuzzer-FlagsTest --foo-bar -runs=10 -ignore_remaining_args=1
>>>>> --baz
>>>>> > -help=1 test 2>&1 | FileCheck
>>>>> > C:\b\slave\sanitizer-windows\llvm\lib\Fuzzer\test\fuzzer-flags.test
>>>>> > --check-prefix=PASSTHRU
>>>>> > mkdir -p
>>>>> > C:\b\slave\sanitizer-windows\build-fuzzer\lib\Fuzzer\test\Ou
>>>>> tput\fuzzer-flags.test.tmp/T0
>>>>> > C:\b\slave\sanitizer-windows\build-fuzzer\lib\Fuzzer\test\Ou
>>>>> tput\fuzzer-flags.test.tmp/T1
>>>>> > touch
>>>>> > C:\b\slave\sanitizer-windows\build-fuzzer\lib\Fuzzer\test\Ou
>>>>> tput\fuzzer-flags.test.tmp/T1/empty
>>>>> > LLVMFuzzer-FlagsTest --foo-bar -merge=1
>>>>> > C:\b\slave\sanitizer-windows\build-fuzzer\lib\Fuzzer\test\Ou
>>>>> tput\fuzzer-flags.test.tmp/T0
>>>>> > C:\b\slave\sanitizer-windows\build-fuzzer\lib\Fuzzer\test\Ou
>>>>> tput\fuzzer-flags.test.tmp/T1
>>>>> > -ignore_remaining_args=1 --baz -help=1 test 2>&1 | FileCheck
>>>>> > C:\b\slave\sanitizer-windows\llvm\lib\Fuzzer\test\fuzzer-flags.test
>>>>> > --check-prefix=PASSTHRU-MERGE
>>>>> > --
>>>>> > Exit Code: 1
>>>>> >
>>>>> > Command Output (stdout):
>>>>> > --
>>>>> > $ "LLVMFuzzer-FlagsTest" "-foo_bar=1"
>>>>> > $ "FileCheck"
>>>>> > "C:\b\slave\sanitizer-windows\llvm\lib\Fuzzer\test\fuzzer-fl
>>>>> ags.test"
>>>>> > "--check-prefix=FOO_BAR"
>>>>> > $ "LLVMFuzzer-FlagsTest" "-runs=10" "--max_len=100"
>>>>> > $ "FileCheck"
>>>>> > "C:\b\slave\sanitizer-windows\llvm\lib\Fuzzer\test\fuzzer-fl
>>>>> ags.test"
>>>>> > "--check-prefix=DASH_DASH"
>>>>> > $ "LLVMFuzzer-FlagsTest" "-help=1"
>>>>> > $ "FileCheck"
>>>>> > "C:\b\slave\sanitizer-windows\llvm\lib\Fuzzer\test\fuzzer-fl
>>>>> ags.test"
>>>>> > "--check-prefix=NO_INTERNAL"
>>>>> > $ "LLVMFuzzer-FlagsTest" "--foo-bar" "-runs=10"
>>>>> > "-ignore_remaining_args=1" "--baz" "-help=1" "test"
>>>>> > $ "FileCheck"
>>>>> > "C:\b\slave\sanitizer-windows\llvm\lib\Fuzzer\test\fuzzer-fl
>>>>> ags.test"
>>>>> > "--check-prefix=PASSTHRU"
>>>>> > # command stderr:
>>>>> > C:\b\slave\sanitizer-windows\llvm\lib\Fuzzer\test\fuzzer-fla
>>>>> gs.test:13:11:
>>>>> > error: expected string not found in input
>>>>> >
>>>>> > PASSTHRU: BINGO --foo-bar --baz -help=1 test
>>>>> >
>>>>> > ^
>>>>> >
>>>>> > <stdin>:1:1: note: scanning from here
>>>>> >
>>>>> > INFO: libFuzzer ignores flags that start with '--'
>>>>> >
>>>>> > ^
>>>>> >
>>>>> >
>>>>> > error: command failed with exit status: 1
>>>>> >
>>>>> > --
>>>>> >
>>>>> > ********************
>>>>> > Testing: 0 .. 10.. 20.. 30.. 40.. 50.. 60.. 70.. 80.. 90..
>>>>> >
>>>>> >
>>>>> >
>>>>> > On Fri, Jul 14, 2017 at 4:33 PM, Justin Bogner via llvm-commits <
>>>>> > llvm-commits at lists.llvm.org> wrote:
>>>>> >
>>>>> >> Author: bogner
>>>>> >> Date: Fri Jul 14 16:33:04 2017
>>>>> >> New Revision: 308069
>>>>> >>
>>>>> >> URL: http://llvm.org/viewvc/llvm-project?rev=308069&view=rev
>>>>> >> Log:
>>>>> >> [libFuzzer] Allow non-fuzzer args after -ignore_remaining_args=1
>>>>> >>
>>>>> >> With this change, libFuzzer will ignore any arguments after a sigil
>>>>> >> argument, but it will preserve these arguments at the end of the
>>>>> >> command line when launching subprocesses. Using this, its possible
>>>>> to
>>>>> >> handle positional and single-dash arguments to the program under
>>>>> test
>>>>> >> by discarding everything up to -ignore_remaining_args=1 in
>>>>> >> LLVMFuzzerInitialize.
>>>>> >>
>>>>> >> Added:
>>>>> >> llvm/trunk/lib/Fuzzer/test/FlagsTest.cpp
>>>>> >> Modified:
>>>>> >> llvm/trunk/lib/Fuzzer/FuzzerDriver.cpp
>>>>> >> llvm/trunk/lib/Fuzzer/FuzzerFlags.def
>>>>> >> llvm/trunk/lib/Fuzzer/FuzzerMerge.cpp
>>>>> >> llvm/trunk/lib/Fuzzer/FuzzerUtil.h
>>>>> >> llvm/trunk/lib/Fuzzer/test/CMakeLists.txt
>>>>> >> llvm/trunk/lib/Fuzzer/test/fuzzer-flags.test
>>>>> >>
>>>>> >> Modified: llvm/trunk/lib/Fuzzer/FuzzerDriver.cpp
>>>>> >> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/
>>>>> >> FuzzerDriver.cpp?rev=308069&r1=308068&r2=308069&view=diff
>>>>> >> ============================================================
>>>>> >> ==================
>>>>> >> --- llvm/trunk/lib/Fuzzer/FuzzerDriver.cpp (original)
>>>>> >> +++ llvm/trunk/lib/Fuzzer/FuzzerDriver.cpp Fri Jul 14 16:33:04 2017
>>>>> >> @@ -186,7 +186,11 @@ static void ParseFlags(const std::vector
>>>>> >> }
>>>>> >> Inputs = new std::vector<std::string>;
>>>>> >> for (size_t A = 1; A < Args.size(); A++) {
>>>>> >> - if (ParseOneFlag(Args[A].c_str())) continue;
>>>>> >> + if (ParseOneFlag(Args[A].c_str())) {
>>>>> >> + if (Flags.ignore_remaining_args)
>>>>> >> + break;
>>>>> >> + continue;
>>>>> >> + }
>>>>> >> Inputs->push_back(Args[A]);
>>>>> >> }
>>>>> >> }
>>>>> >> @@ -356,16 +360,17 @@ int MinimizeCrashInput(const std::vector
>>>>> >> exit(1);
>>>>> >> }
>>>>> >> std::string InputFilePath = Inputs->at(0);
>>>>> >> - std::string BaseCmd =
>>>>> >> - CloneArgsWithoutX(Args, "minimize_crash",
>>>>> "exact_artifact_path");
>>>>> >> - auto InputPos = BaseCmd.find(" " + InputFilePath + " ");
>>>>> >> + auto BaseCmd = SplitBefore(
>>>>> >> + "-ignore_remaining_args=1",
>>>>> >> + CloneArgsWithoutX(Args, "minimize_crash",
>>>>> "exact_artifact_path"));
>>>>> >> + auto InputPos = BaseCmd.first.find(" " + InputFilePath + " ");
>>>>> >> assert(InputPos != std::string::npos);
>>>>> >> - BaseCmd.erase(InputPos, InputFilePath.size() + 1);
>>>>> >> + BaseCmd.first.erase(InputPos, InputFilePath.size() + 1);
>>>>> >> if (Flags.runs <= 0 && Flags.max_total_time == 0) {
>>>>> >> Printf("INFO: you need to specify -runs=N or "
>>>>> >> "-max_total_time=N with -minimize_crash=1\n"
>>>>> >> "INFO: defaulting to -max_total_time=600\n");
>>>>> >> - BaseCmd += " -max_total_time=600";
>>>>> >> + BaseCmd.first += " -max_total_time=600";
>>>>> >> }
>>>>> >>
>>>>> >> auto LogFilePath = DirPlusFile(
>>>>> >> @@ -378,7 +383,8 @@ int MinimizeCrashInput(const std::vector
>>>>> >> Printf("CRASH_MIN: minimizing crash input: '%s' (%zd bytes)\n",
>>>>> >> CurrentFilePath.c_str(), U.size());
>>>>> >>
>>>>> >> - auto Cmd = BaseCmd + " " + CurrentFilePath + LogFileRedirect;
>>>>> >> + auto Cmd = BaseCmd.first + " " + CurrentFilePath +
>>>>> LogFileRedirect +
>>>>> >> " " +
>>>>> >> + BaseCmd.second;
>>>>> >>
>>>>> >> Printf("CRASH_MIN: executing: %s\n", Cmd.c_str());
>>>>> >> int ExitCode = ExecuteCommand(Cmd);
>>>>> >>
>>>>> >> Modified: llvm/trunk/lib/Fuzzer/FuzzerFlags.def
>>>>> >> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/
>>>>> >> FuzzerFlags.def?rev=308069&r1=308068&r2=308069&view=diff
>>>>> >> ============================================================
>>>>> >> ==================
>>>>> >> --- llvm/trunk/lib/Fuzzer/FuzzerFlags.def (original)
>>>>> >> +++ llvm/trunk/lib/Fuzzer/FuzzerFlags.def Fri Jul 14 16:33:04 2017
>>>>> >> @@ -121,6 +121,9 @@ FUZZER_FLAG_STRING(exit_on_src_pos, "Exi
>>>>> >> FUZZER_FLAG_STRING(exit_on_item, "Exit if an item with a given
>>>>> sha1 sum"
>>>>> >> " was added to the corpus. "
>>>>> >> "Used primarily for testing libFuzzer itself.")
>>>>> >> +FUZZER_FLAG_INT(ignore_remaining_args, 0, "If 1, ignore all
>>>>> arguments
>>>>> >> passed "
>>>>> >> + "after this one. Useful for fuzzers that need to
>>>>> do their
>>>>> >> own "
>>>>> >> + "argument parsing.")
>>>>> >>
>>>>> >> FUZZER_FLAG_STRING(run_equivalence_server, "Experimental")
>>>>> >> FUZZER_FLAG_STRING(use_equivalence_server, "Experimental")
>>>>> >>
>>>>> >> Modified: llvm/trunk/lib/Fuzzer/FuzzerMerge.cpp
>>>>> >> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/
>>>>> >> FuzzerMerge.cpp?rev=308069&r1=308068&r2=308069&view=diff
>>>>> >> ============================================================
>>>>> >> ==================
>>>>> >> --- llvm/trunk/lib/Fuzzer/FuzzerMerge.cpp (original)
>>>>> >> +++ llvm/trunk/lib/Fuzzer/FuzzerMerge.cpp Fri Jul 14 16:33:04 2017
>>>>> >> @@ -285,12 +285,13 @@ void Fuzzer::CrashResistantMerge(const s
>>>>> >>
>>>>> >> // Execute the inner process untill it passes.
>>>>> >> // Every inner process should execute at least one input.
>>>>> >> - std::string BaseCmd = CloneArgsWithoutX(Args, "keep-all-flags");
>>>>> >> + auto BaseCmd = SplitBefore("-ignore_remaining_args=1",
>>>>> >> + CloneArgsWithoutX(Args,
>>>>> "keep-all-flags"));
>>>>> >> bool Success = false;
>>>>> >> for (size_t i = 1; i <= AllFiles.size(); i++) {
>>>>> >> Printf("MERGE-OUTER: attempt %zd\n", i);
>>>>> >> - auto ExitCode =
>>>>> >> - ExecuteCommand(BaseCmd + " -merge_control_file=" + CFPath);
>>>>> >> + auto ExitCode = ExecuteCommand(BaseCmd.first + "
>>>>> >> -merge_control_file=" +
>>>>> >> + CFPath + " " + BaseCmd.second);
>>>>> >> if (!ExitCode) {
>>>>> >> Printf("MERGE-OUTER: succesfull in %zd attempt(s)\n", i);
>>>>> >> Success = true;
>>>>> >>
>>>>> >> Modified: llvm/trunk/lib/Fuzzer/FuzzerUtil.h
>>>>> >> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/
>>>>> >> FuzzerUtil.h?rev=308069&r1=308068&r2=308069&view=diff
>>>>> >> ============================================================
>>>>> >> ==================
>>>>> >> --- llvm/trunk/lib/Fuzzer/FuzzerUtil.h (original)
>>>>> >> +++ llvm/trunk/lib/Fuzzer/FuzzerUtil.h Fri Jul 14 16:33:04 2017
>>>>> >> @@ -67,6 +67,14 @@ inline std::string CloneArgsWithoutX(con
>>>>> >> return CloneArgsWithoutX(Args, X, X);
>>>>> >> }
>>>>> >>
>>>>> >> +inline std::pair<std::string, std::string> SplitBefore(std::string
>>>>> X,
>>>>> >> + std::string
>>>>> S) {
>>>>> >> + auto Pos = S.find(X);
>>>>> >> + if (Pos == std::string::npos)
>>>>> >> + return std::make_pair(S, "");
>>>>> >> + return std::make_pair(S.substr(0, Pos), S.substr(Pos));
>>>>> >> +}
>>>>> >> +
>>>>> >> std::string DisassembleCmd(const std::string &FileName);
>>>>> >>
>>>>> >> std::string SearchRegexCmd(const std::string &Regex);
>>>>> >>
>>>>> >> Modified: llvm/trunk/lib/Fuzzer/test/CMakeLists.txt
>>>>> >> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/
>>>>> >> test/CMakeLists.txt?rev=308069&r1=308068&r2=308069&view=diff
>>>>> >> ============================================================
>>>>> >> ==================
>>>>> >> --- llvm/trunk/lib/Fuzzer/test/CMakeLists.txt (original)
>>>>> >> +++ llvm/trunk/lib/Fuzzer/test/CMakeLists.txt Fri Jul 14 16:33:04
>>>>> 2017
>>>>> >> @@ -90,6 +90,7 @@ set(Tests
>>>>> >> EmptyTest
>>>>> >> EquivalenceATest
>>>>> >> EquivalenceBTest
>>>>> >> + FlagsTest
>>>>> >> FourIndependentBranchesTest
>>>>> >> FullCoverageSetTest
>>>>> >> InitializeTest
>>>>> >>
>>>>> >> Added: llvm/trunk/lib/Fuzzer/test/FlagsTest.cpp
>>>>> >> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/
>>>>> >> test/FlagsTest.cpp?rev=308069&view=auto
>>>>> >> ============================================================
>>>>> >> ==================
>>>>> >> --- llvm/trunk/lib/Fuzzer/test/FlagsTest.cpp (added)
>>>>> >> +++ llvm/trunk/lib/Fuzzer/test/FlagsTest.cpp Fri Jul 14 16:33:04
>>>>> 2017
>>>>> >> @@ -0,0 +1,32 @@
>>>>> >> +// This file is distributed under the University of Illinois Open
>>>>> Source
>>>>> >> +// License. See LICENSE.TXT for details.
>>>>> >> +
>>>>> >> +// Parse some flags
>>>>> >> +#include <string>
>>>>> >> +#include <vector>
>>>>> >> +
>>>>> >> +static std::vector<std::string> Flags;
>>>>> >> +
>>>>> >> +extern "C" int LLVMFuzzerInitialize(int *Argc, char ***Argv) {
>>>>> >> + // Parse --flags and anything after -ignore_remaining_args=1 is
>>>>> passed.
>>>>> >> + int I = 1;
>>>>> >> + while (I < *Argc) {
>>>>> >> + std::string S((*Argv)[I++]);
>>>>> >> + if (S == "-ignore_remaining_args=1")
>>>>> >> + break;
>>>>> >> + if (S.substr(0, 2) == "--")
>>>>> >> + Flags.push_back(S);
>>>>> >> + }
>>>>> >> + while (I < *Argc)
>>>>> >> + Flags.push_back(std::string((*Argv)[I++]));
>>>>> >> +
>>>>> >> + return 0;
>>>>> >> +}
>>>>> >> +
>>>>> >> +extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t
>>>>> Size) {
>>>>> >> + fprintf(stderr, "BINGO ");
>>>>> >> + for (auto Flag : Flags)
>>>>> >> + fprintf(stderr, "%s ", Flag.c_str());
>>>>> >> + fprintf(stderr, "\n");
>>>>> >> + exit(0);
>>>>> >> +}
>>>>> >>
>>>>> >> Modified: llvm/trunk/lib/Fuzzer/test/fuzzer-flags.test
>>>>> >> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/
>>>>> >> test/fuzzer-flags.test?rev=308069&r1=308068&r2=308069&view=diff
>>>>> >> ============================================================
>>>>> >> ==================
>>>>> >> --- llvm/trunk/lib/Fuzzer/test/fuzzer-flags.test (original)
>>>>> >> +++ llvm/trunk/lib/Fuzzer/test/fuzzer-flags.test Fri Jul 14
>>>>> 16:33:04 2017
>>>>> >> @@ -1,10 +1,18 @@
>>>>> >> -RUN: LLVMFuzzer-SimpleTest -foo_bar=1 2>&1 | FileCheck %s
>>>>> >> --check-prefix=FOO_BAR
>>>>> >> +RUN: LLVMFuzzer-FlagsTest -foo_bar=1 2>&1 | FileCheck %s
>>>>> >> --check-prefix=FOO_BAR
>>>>> >> FOO_BAR: WARNING: unrecognized flag '-foo_bar=1'; use -help=1 to
>>>>> list all
>>>>> >> flags
>>>>> >> FOO_BAR: BINGO
>>>>> >>
>>>>> >> -RUN: LLVMFuzzer-SimpleTest -runs=10 --max_len=100 2>&1 | FileCheck
>>>>> %s
>>>>> >> --check-prefix=DASH_DASH
>>>>> >> +RUN: LLVMFuzzer-FlagsTest -runs=10 --max_len=100 2>&1 | FileCheck
>>>>> %s
>>>>> >> --check-prefix=DASH_DASH
>>>>> >> DASH_DASH: WARNING: did you mean '-max_len=100' (single dash)?
>>>>> >> DASH_DASH: INFO: A corpus is not provided, starting from an empty
>>>>> corpus
>>>>> >>
>>>>> >> -RUN: LLVMFuzzer-SimpleTest -help=1 2>&1 | FileCheck %s
>>>>> >> --check-prefix=NO_INTERNAL
>>>>> >> +RUN: LLVMFuzzer-FlagsTest -help=1 2>&1 | FileCheck %s
>>>>> >> --check-prefix=NO_INTERNAL
>>>>> >> NO_INTERNAL-NOT: internal flag
>>>>> >> +
>>>>> >> +RUN: LLVMFuzzer-FlagsTest --foo-bar -runs=10
>>>>> -ignore_remaining_args=1
>>>>> >> --baz -help=1 test 2>&1 | FileCheck %s --check-prefix=PASSTHRU
>>>>> >> +PASSTHRU: BINGO --foo-bar --baz -help=1 test
>>>>> >> +
>>>>> >> +RUN: mkdir -p %t/T0 %t/T1
>>>>> >> +RUN: touch %t/T1/empty
>>>>> >> +RUN: LLVMFuzzer-FlagsTest --foo-bar -merge=1 %t/T0 %t/T1
>>>>> >> -ignore_remaining_args=1 --baz -help=1 test 2>&1 | FileCheck %s
>>>>> >> --check-prefix=PASSTHRU-MERGE
>>>>> >> +PASSTHRU-MERGE: BINGO --foo-bar --baz -help=1 test
>>>>> >>
>>>>> >>
>>>>> >> _______________________________________________
>>>>> >> llvm-commits mailing list
>>>>> >> llvm-commits at lists.llvm.org
>>>>> >> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-commits
>>>>> >>
>>>>>
>>>>
>>>>
>>>
>>
>
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