Error during index

[ambihelical]

I'm getting this error while indexing a cross-compiled project, many if not all files have the same issue.
The following was in Emacs buffer lsp-cquery stderr". Any help in debugging this would be appreciated. In the following, I replaced some job-sensitive information with [censored].

I'm on commit 1301569

2018-03-15 10:11:35.036 ( 0.072s) [indexer0 ]clang_translation_unit.cc:99 libclang generic failure for /home/[censored]/dev/[censored]/[censored]/External/tinyxml/tinyxml.cpp. Please try running the following, identify which flag causes the issue, and report a bug. cquery will then filter the flag for you automatically:
$ /home/[censored]/dev/[censored]/android-sdk/toolchain/arm-linux-androideabi-4.9/bin/arm-linux-androideabi-g++ -working-directory=/home/[censored]/dev/[censored]/build/External/tinyxml -DANDROID -DBOARD="Android" -DLOCALE="usa" -DMANUFACTURER="[censored]" -DPLATFORM_SETTINGS_FILE="/home/[censored]/dev/[censored]/[censored]/[censored]util/platform/AndroidPlatformSettings.h" -DUNQUOTED_BOARD=Android -Dtinyxml_EXPORTS -Wno-psabi --sysroot=/home/[censored]/dev/[censored]/android-sdk/toolchain/arm-linux-androideabi-4.9/sysroot -funwind-tables -fsigned-char -no-canonical-prefixes -march=armv7-a -fdata-sections -ffunction-sections -Wa,--noexecstack -std=c++11 -L/home/[censored]/dev/[censored]/[censored]/app/android/build/libs/armeabi-v7a/ -lgnustl_shared -llog -DANDROID -pipe -Wall -Wtype-limits -Wuninitialized -fmessage-length=0 -ftabstop=4 -Wno-unknown-pragmas -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -DVERBOSE_LOGGING -DBUILD_DEBUG -DBUILD_TYPE=DEBUG -DREVISION_STRING="" -DVERSION_STRING="DEBUG" -g -ffunction-sections -fdata-sections -Os -ffast-math -fasynchronous-unwind-tables -fPIC -isystem /home/[censored]/dev/[censored]/android-sdk/toolchain/arm-linux-androideabi-4.9/sysroot/usr/include -isystem /home/[censored]/dev/[censored]/android-sdk/toolchain/arm-linux-androideabi-4.9/include/c++/4.9 -isystem /home/[censored]/dev/[censored]/android-sdk/toolchain/arm-linux-androideabi-4.9/include/c++/4.9/arm-linux-androideabi/armv7-a -fPIC /home/[censored]/dev/[censored]/[censored]/External/tinyxml/tinyxml.cpp -resource-dir=/home/[censored]/extern/cquery/build/release/lib/clang+llvm-6.0.0-x86_64-linux-gnu-ubuntu-14.04/lib/clang/6.0.0 -Wno-unknown-warning-option -fparse-all-comments -fsyntax-only

The result of doing what it requests is as follows:

arm-linux-androideabi-g++: error: unrecognized command line option '-working-directory=/home/[censored]/dev/[censored]/build/External/tinyxml'
arm-linux-androideabi-g++: error: unrecognized command line option '-resource-dir=/home/[censored]/extern/cquery/build/clang+llvm-6.0.0-x86_64-linux-gnu-ubuntu-14.04/lib/clang/6.0.0'
arm-linux-androideabi-g++: error: unrecognized command line option '-fparse-all-comments'

[edjubuh]

You need to use clang as your compiler. You can use clang --target=armv7-none-linux-androideabi (target found here), along with the additional sysroot info, which it looks like you might have.

Edit: clang needs to be the compiler cquery is instructed to use - you can still compile your actual binary with arm-linux-androideabi-g++

[ambihelical]

Sorry, I'm not very familiar with the tool. Where do I specify that?

[edjubuh]

Did you write your own .cquery or compile_commands.json file?

[ambihelical]

The compile_commands.json file was auto-generated by cmake.

[MaskRay]

@ambihelical I think what @edjubuh meant is if you enclose some example entries of compile_commands.json, it will be more helpful

The clang compiler driver will behave like a cross compiler if its executable name is like arm-linux-androideabi-g++, the name essentially defines a -target

[ambihelical]

@MaskRay here is the first entry, censored:
[
{
"directory": "/home/[censored]/dev/[censored]/build/External/tinyxml",
"command": "/home/[censored]/dev/[censored]/android-sdk/toolchain/arm-linux-androideabi-4.9/bin/arm-linux-androideabi-g++ -DANDROID -DBOARD=\"Android\" -DLOCALE=\"usa\" -DMANUFACTURER=\"[censored]\" -DPLATFORM_SETTINGS_FILE=\"/home/[censored]/dev/[censored]/[censored]/[censored]util/platform/AndroidPlatformSettings.h\" -DUNQUOTED_BOARD=Android -Dtinyxml_EXPORTS -Wno-psabi --sysroot=/home/[censored]/dev/[censored]/android-sdk/toolchain/arm-linux-androideabi-4.9/sysroot -funwind-tables -finline-limit=64 -fsigned-char -no-canonical-prefixes -march=armv7-a -mfloat-abi=softfp -mfpu=vfpv3-d16 -fdata-sections -ffunction-sections -Wa,--noexecstack -std=c++11 -L/home/[censored]/dev/[censored]/[censored]/app/android/build/libs/armeabi-v7a/ -lgnustl_shared -llog -DANDROID -pipe -Wall -Wtype-limits -Wuninitialized -fmessage-length=0 -ftabstop=4 -Wno-unknown-pragmas -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -DVERBOSE_LOGGING -DBUILD_DEBUG -DBUILD_TYPE=DEBUG -DREVISION_STRING=\"\" -DVERSION_STRING=\"DEBUG\" -g -ffunction-sections -fdata-sections -Os -ffast-math -fasynchronous-unwind-tables -fPIC -isystem /home/[censored]/dev/[censored]/android-sdk/toolchain/arm-linux-androideabi-4.9/sysroot/usr/include -isystem /home/[censored]/dev/[censored]/android-sdk/toolchain/arm-linux-androideabi-4.9/include/c++/4.9 -isystem /home/[censored]/dev/[censored]/android-sdk/toolchain/arm-linux-androideabi-4.9/include/c++/4.9/arm-linux-androideabi/armv7-a -fPIC -o CMakeFiles/tinyxml.dir/tinyxml.cpp.o -c /home/[censored]/dev/[censored]/[censored]/External/tinyxml/tinyxml.cpp",
"file": "/home/[censored]/dev/[censored]/[censored]/External/tinyxml/tinyxml.cpp"
},

[Riatre]

I suspect it is "-no-canonical-prefixes" that makes libclang bark.
Could you please change "/home/[censored]/dev/[censored]/android-sdk/toolchain/arm-linux-androideabi-4.9/bin/arm-linux-androideabi-g++" to "clang -target arm-linux-androideabi" in your command line, try to execute this and confirm it?

[ambihelical]

@MaskRay Are there commits that addresses this? If not, I'll be able to provide more feedback when I go back to work.

[MaskRay]

Riatre pointed out the cause: -no-canonical-prefixes

[ambihelical]

I don't understand how pointing out the cause, if it is the only problem, fixes the issue in any way. Is there something I need to do with that information that is escaping me?

[ambihelical]

@Riatre I used the cquery-downloaded clang as follows:

~/extern/cquery/build/clang+llvm-6.0.0-x86_64-linux-gnu-ubuntu-14.04/bin/clang++ -target arm-linux-androideabi [...rest of command...]

The following is the output:

clang++: warning: -lgnustl_shared: 'linker' input unused [-Wunused-command-line-argument]
clang++: warning: -llog: 'linker' input unused [-Wunused-command-line-argument]
clang++: warning: optimization flag '-finline-limit=64' is not supported [-Wignored-optimization-argument]
clang++: warning: argument unused during compilation: '-L/home/[censored]/app/android/build/libs/armeabi-v7a/' [-Wunused-command-line-argument]
warning: unknown warning option '-Wno-psabi' [-Wunknown-warning-option]

[ambihelical]

@MaskRay, @jacobdufault, as far as I can tell this has not been resolved in any way that in my experience bugs are usually resolved, if you agree, please reopen, if not please let me know how I should follow up.

[jacobdufault]

I'll reopen, does removing -no-canonical-prefixes fix the issue?

[ambihelical]

Removing -fno-canonical-prefixes didn't help. I tried removing each option one by one from compile_commands.json using my best guess and then running emacs to test. Finally, after removing -march=armv7-a I no longer got the generic error.

[jacobdufault]

Sounds like we need to ban -march= flags, would you be willing to submit a PR changing project.cc?

[ambihelical]

I'll give it a shot.

[ambihelical]

@jacobdufault Stupid question: I see there are a number of tests, how do you run them? I tried e2e_test_runner.py, but it just crashes. After running waf -h, I tried ./waf list, but it just crashes. This is on Ubuntu 16.04

[jacobdufault]

e2e tests are still a WIP. ./build/release/bin/cquery --test-unit --test-index will run the unit and index tests.

[jacobdufault]

Closing in favor of #569, please let me know if this should be reopened.