[llvm-dev] Get full cmake lines and prepocessed source for a GCC bug report

[Sedat Dilek via llvm-dev]

On Wed, Aug 29, 2018 at 10:53 AM, Hans Wennborg <hans at chromium.org> wrote:
> On Wed, Aug 29, 2018 at 10:18 AM, Sedat Dilek <sedat.dilek at gmail.com> wrote:
>> On Wed, Aug 29, 2018 at 10:14 AM, Hans Wennborg <hans at chromium.org> wrote:
>>> On Wed, Aug 29, 2018 at 9:45 AM, Sedat Dilek via llvm-dev
>>> <llvm-dev at lists.llvm.org> wrote:
>>>> Hi,
>>>>
>>>> for filing a GCC v8.2.0 bug in Debian/buster AMD64 the Debian/GCC
>>>> mainatiners want two things...
>>>>
>>>> [ FULL CMAKE LINE ]
>>>>
>>>> How do I configure this in the LLVM/Clang build?
>>>> Can I set an option of cmake?
>>>>
>>>> [ PREPROCESSED SOURCE FILES ]
>>>>
>>>> How and where do I get the preprocessed source?
>>>> Do I need to set options for this in my build-script?
>>>
>>> From your other email, when the compiler crashed, ninja printed the invocation:
>>>
>>> /usr/bin/g++-8  -DGTEST_HAS_RTTI=0 -D_DEBUG -D_GNU_SOURCE
>>> -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS
>>> -Ilib/Bitcode/Reader
>>> -I/home/sdi/src/llvm-toolchain/llvm/lib/Bitcode/Reader -Iinclude
>>> -I/home/sdi/src/llvm-toolchain/llvm/include -fPIC
>>> -fvisibility-inlines-hidden -Werror=date-time -std=c++11 -Wall -Wextra
>>> -Wno-unused-parameter -Wwrite-strings -Wcast-qual
>>> -Wno-missing-field-initializers -pedantic -Wno-long-long
>>> -Wno-maybe-uninitialized -Wno-class-memaccess
>>> -Wdelete-non-virtual-dtor -Wno-comment -fdiagnostics-color
>>> -ffunction-sections -fdata-sections -O3    -UNDEBUG  -fno-exceptions
>>> -fno-rtti -MD -MT
>>> lib/Bitcode/Reader/CMakeFiles/LLVMBitReader.dir/MetadataLoader.cpp.o
>>> -MF lib/Bitcode/Reader/CMakeFiles/LLVMBitReader.dir/MetadataLoader.cpp.o.d
>>> -o lib/Bitcode/Reader/CMakeFiles/LLVMBitReader.dir/MetadataLoader.cpp.o
>>> -c /home/sdi/src/llvm-toolchain/llvm/lib/Bitcode/Reader/MetadataLoader.cpp
>>>
>>>
>>> To generate preprocessed source from that, you use the -E flag, so
>>> adding something like this to the end of command-line should work:
>>>
>>> -E -o /tmp/preprocessed.ii
>>>
>>>
>>> To see the internal GCC invocation, you can add the -### option to the
>>> command. The output of that, and the preprocessed source, should be
>>> enough to reproduce the bug.
>>>
>>
>> Thanks, Hans.
>>
>> I kept the build-directory of my build with my selfmade llvm-toolchain
>> v7.0.0rc2.
>>
>> So I can run this gcc-line directly?
>
> Yes, I think that should work.

sdi at iniza:~/src/llvm-toolchain$ ./scripts/gcc-bug.sh

sdi at iniza:~/src/llvm-toolchain$ find build/ -name '*MetadataLoader*'
build/lib/Bitcode/Reader/CMakeFiles/LLVMBitReader.dir/MetadataLoader.cpp.o
build/lib/Bitcode/Reader/CMakeFiles/LLVMBitReader.dir/MetadataLoader.cpp.o.d

sdi at iniza:~/src/llvm-toolchain$ LC_ALL=C ls -lh
build/lib/Bitcode/Reader/CMakeFiles/LLVMBitReader.dir/MetadataLoader.cpp.o
build/lib/Bitcode/Reader/CMakeFiles/LLVMBitReader.dir/MetadataLoader.cpp.o.d
-rw-r--r-- 1 sdi sdi 271K Aug 29 12:15
build/lib/Bitcode/Reader/CMakeFiles/LLVMBitReader.dir/MetadataLoader.cpp.o
-rw-r--r-- 1 sdi sdi  20K Aug 29 12:15
build/lib/Bitcode/Reader/CMakeFiles/LLVMBitReader.dir/MetadataLoader.cpp.o.d

Above seems to generate the files correctly?
No, Error messages.

sdi at iniza:~/src/llvm-toolchain$ LC_ALL=C
./scripts/gcc-bug_preprocessed-source.sh
cc1plus: error: output filename specified twice
cc1plus: error: too many filenames given.  Type cc1plus --help for usage
cc1plus: fatal error: /tmp/preprocessed.d: No such file or directory
compilation terminated.

What's wrong with the 2nd run when trying to generate preprocessed.ii?

I tried to replace/move...

-        -o lib/Bitcode/Reader/CMakeFiles/LLVMBitReader.dir/MetadataLoader.cpp.o
\
+        -E -o /tmp/preprocessed.ii \

Thanks.

- Sedat -
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