Build failed due to missing header

[jakesays-old]

The compiler-rt build step failed because it couldn't find <cstdint>. Below is the build output.

/home/jake/pax/depot_tools/ninja
[0/1] Re-running CMake...
-- Generator .............. Ninja
-- Build Type ............. Release
-- llvm-config ............ /home/jake/pax/flutter_embedded/sdk/toolchain/bin/llvm-config
-- Flutter ................
-- Configuring done
-- Generating done
-- Build files have been written to: /home/jake/pax/flutter_embedded/out
[1/36] Performing configure step for 'compiler-rt'
-- The C compiler identification is Clang 8.0.0
-- The CXX compiler identification is Clang 8.0.0
-- The ASM compiler identification is Clang
-- Found assembler: /home/jake/pax/flutter_embedded/sdk/toolchain/bin/clang
-- Check for working C compiler: /home/jake/pax/flutter_embedded/sdk/toolchain/bin/clang
-- Check for working C compiler: /home/jake/pax/flutter_embedded/sdk/toolchain/bin/clang -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /home/jake/pax/flutter_embedded/sdk/toolchain/bin/clang++
-- Check for working CXX compiler: /home/jake/pax/flutter_embedded/sdk/toolchain/bin/clang++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Looking for unwind.h
-- Looking for unwind.h - found
-- Looking for rpc/xdr.h
-- Looking for rpc/xdr.h - found
CMake Warning at cmake/Modules/CompilerRTUtils.cmake:261 (message):
testingsupport library not installed, some tests will be skipped
Call Stack (most recent call first):
CMakeLists.txt:69 (load_llvm_config)

-- Found PythonInterp: /usr/bin/python2.7 (found version "2.7.15")
-- Looking for fopen in c
-- Looking for fopen in c - found
-- Looking for __gcc_personality_v0 in gcc_s
-- Looking for __gcc_personality_v0 in gcc_s - found
-- Performing Test COMPILER_RT_HAS_NODEFAULTLIBS_FLAG
-- Performing Test COMPILER_RT_HAS_NODEFAULTLIBS_FLAG - Success
-- Performing Test COMPILER_RT_HAS_FFREESTANDING_FLAG
-- Performing Test COMPILER_RT_HAS_FFREESTANDING_FLAG - Success
-- Performing Test COMPILER_RT_HAS_FPIE_FLAG
-- Performing Test COMPILER_RT_HAS_FPIE_FLAG - Success
-- Performing Test COMPILER_RT_HAS_FNO_BUILTIN_FLAG
-- Performing Test COMPILER_RT_HAS_FNO_BUILTIN_FLAG - Success
-- Performing Test COMPILER_RT_HAS_FNO_EXCEPTIONS_FLAG
-- Performing Test COMPILER_RT_HAS_FNO_EXCEPTIONS_FLAG - Success
-- Performing Test COMPILER_RT_HAS_FOMIT_FRAME_POINTER_FLAG
-- Performing Test COMPILER_RT_HAS_FOMIT_FRAME_POINTER_FLAG - Success
-- Performing Test COMPILER_RT_HAS_FUNWIND_TABLES_FLAG
-- Performing Test COMPILER_RT_HAS_FUNWIND_TABLES_FLAG - Success
-- Performing Test COMPILER_RT_HAS_FNO_STACK_PROTECTOR_FLAG
-- Performing Test COMPILER_RT_HAS_FNO_STACK_PROTECTOR_FLAG - Success
-- Performing Test COMPILER_RT_HAS_FNO_SANITIZE_SAFE_STACK_FLAG
-- Performing Test COMPILER_RT_HAS_FNO_SANITIZE_SAFE_STACK_FLAG - Success
-- Performing Test COMPILER_RT_HAS_FVISIBILITY_HIDDEN_FLAG
-- Performing Test COMPILER_RT_HAS_FVISIBILITY_HIDDEN_FLAG - Success
-- Performing Test COMPILER_RT_HAS_FRTTI_FLAG
-- Performing Test COMPILER_RT_HAS_FRTTI_FLAG - Success
-- Performing Test COMPILER_RT_HAS_FNO_RTTI_FLAG
-- Performing Test COMPILER_RT_HAS_FNO_RTTI_FLAG - Success
-- Performing Test COMPILER_RT_HAS_FNO_FUNCTION_SECTIONS_FLAG
-- Performing Test COMPILER_RT_HAS_FNO_FUNCTION_SECTIONS_FLAG - Success
-- Performing Test COMPILER_RT_HAS_STD_CXX11_FLAG
-- Performing Test COMPILER_RT_HAS_STD_CXX11_FLAG - Success
-- Performing Test COMPILER_RT_HAS_FTLS_MODEL_INITIAL_EXEC
-- Performing Test COMPILER_RT_HAS_FTLS_MODEL_INITIAL_EXEC - Success
-- Performing Test COMPILER_RT_HAS_FNO_LTO_FLAG
-- Performing Test COMPILER_RT_HAS_FNO_LTO_FLAG - Success
-- Performing Test COMPILER_RT_HAS_MSSE3_FLAG
-- Performing Test COMPILER_RT_HAS_MSSE3_FLAG - Failed
-- Performing Test COMPILER_RT_HAS_MSSE4_2_FLAG
-- Performing Test COMPILER_RT_HAS_MSSE4_2_FLAG - Failed
-- Performing Test COMPILER_RT_HAS_SYSROOT_FLAG
-- Performing Test COMPILER_RT_HAS_SYSROOT_FLAG - Success
-- Performing Test COMPILER_RT_HAS_MCRC_FLAG
-- Performing Test COMPILER_RT_HAS_MCRC_FLAG - Success
-- Performing Test COMPILER_RT_HAS_FVISIBILITY_INLINES_HIDDEN_FLAG
-- Performing Test COMPILER_RT_HAS_FVISIBILITY_INLINES_HIDDEN_FLAG - Success
-- Performing Test COMPILER_RT_HAS_GR_FLAG
-- Performing Test COMPILER_RT_HAS_GR_FLAG - Failed
-- Performing Test COMPILER_RT_HAS_GS_FLAG
-- Performing Test COMPILER_RT_HAS_GS_FLAG - Failed
-- Performing Test COMPILER_RT_HAS_MT_FLAG
-- Performing Test COMPILER_RT_HAS_MT_FLAG - Failed
-- Performing Test COMPILER_RT_HAS_Oy_FLAG
-- Performing Test COMPILER_RT_HAS_Oy_FLAG - Failed
-- Performing Test COMPILER_RT_HAS_GLINE_TABLES_ONLY_FLAG
-- Performing Test COMPILER_RT_HAS_GLINE_TABLES_ONLY_FLAG - Success
-- Performing Test COMPILER_RT_HAS_G_FLAG
-- Performing Test COMPILER_RT_HAS_G_FLAG - Success
-- Performing Test COMPILER_RT_HAS_Zi_FLAG
-- Performing Test COMPILER_RT_HAS_Zi_FLAG - Failed
-- Performing Test COMPILER_RT_HAS_WALL_FLAG
-- Performing Test COMPILER_RT_HAS_WALL_FLAG - Success
-- Performing Test COMPILER_RT_HAS_WERROR_FLAG
-- Performing Test COMPILER_RT_HAS_WERROR_FLAG - Success
-- Performing Test COMPILER_RT_HAS_WFRAME_LARGER_THAN_FLAG
-- Performing Test COMPILER_RT_HAS_WFRAME_LARGER_THAN_FLAG - Success
-- Performing Test COMPILER_RT_HAS_WGLOBAL_CONSTRUCTORS_FLAG
-- Performing Test COMPILER_RT_HAS_WGLOBAL_CONSTRUCTORS_FLAG - Success
-- Performing Test COMPILER_RT_HAS_WC99_EXTENSIONS_FLAG
-- Performing Test COMPILER_RT_HAS_WC99_EXTENSIONS_FLAG - Success
-- Performing Test COMPILER_RT_HAS_WGNU_FLAG
-- Performing Test COMPILER_RT_HAS_WGNU_FLAG - Success
-- Performing Test COMPILER_RT_HAS_WNON_VIRTUAL_DTOR_FLAG
-- Performing Test COMPILER_RT_HAS_WNON_VIRTUAL_DTOR_FLAG - Success
-- Performing Test COMPILER_RT_HAS_WVARIADIC_MACROS_FLAG
-- Performing Test COMPILER_RT_HAS_WVARIADIC_MACROS_FLAG - Success
-- Performing Test COMPILER_RT_HAS_WUNUSED_PARAMETER_FLAG
-- Performing Test COMPILER_RT_HAS_WUNUSED_PARAMETER_FLAG - Success
-- Performing Test COMPILER_RT_HAS_WCOVERED_SWITCH_DEFAULT_FLAG
-- Performing Test COMPILER_RT_HAS_WCOVERED_SWITCH_DEFAULT_FLAG - Success
-- Performing Test COMPILER_RT_HAS_W4_FLAG
-- Performing Test COMPILER_RT_HAS_W4_FLAG - Failed
-- Performing Test COMPILER_RT_HAS_WX_FLAG
-- Performing Test COMPILER_RT_HAS_WX_FLAG - Failed
-- Performing Test COMPILER_RT_HAS_WD4146_FLAG
-- Performing Test COMPILER_RT_HAS_WD4146_FLAG - Failed
-- Performing Test COMPILER_RT_HAS_WD4291_FLAG
-- Performing Test COMPILER_RT_HAS_WD4291_FLAG - Failed
-- Performing Test COMPILER_RT_HAS_WD4221_FLAG
-- Performing Test COMPILER_RT_HAS_WD4221_FLAG - Failed
-- Performing Test COMPILER_RT_HAS_WD4391_FLAG
-- Performing Test COMPILER_RT_HAS_WD4391_FLAG - Failed
-- Performing Test COMPILER_RT_HAS_WD4722_FLAG
-- Performing Test COMPILER_RT_HAS_WD4722_FLAG - Failed
-- Performing Test COMPILER_RT_HAS_WD4800_FLAG
-- Performing Test COMPILER_RT_HAS_WD4800_FLAG - Failed
-- Looking for func
-- Looking for func - found
-- Looking for dlopen in dl
-- Looking for dlopen in dl - found
-- Looking for shm_open in rt
-- Looking for shm_open in rt - found
-- Looking for pow in m
-- Looking for pow in m - found
-- Looking for pthread_create in pthread
-- Looking for pthread_create in pthread - found
-- Looking for setupterm in terminfo
-- Looking for setupterm in terminfo - not found
-- Looking for setupterm in tinfo
-- Looking for setupterm in tinfo - not found
-- Looking for setupterm in curses
-- Looking for setupterm in curses - found
-- Looking for __cxa_throw in c++
-- Looking for __cxa_throw in c++ - not found
-- Looking for __cxa_throw in stdc++
-- Looking for __cxa_throw in stdc++ - found
-- Compiler-RT supported architectures: arm;armv6m
-- Performing Test COMPILER_RT_HAS_STD_C11_FLAG
-- Performing Test COMPILER_RT_HAS_STD_C11_FLAG - Success
-- Performing Test COMPILER_RT_HAS_VISIBILITY_HIDDEN_FLAG
-- Performing Test COMPILER_RT_HAS_VISIBILITY_HIDDEN_FLAG - Success
-- Performing Test COMPILER_RT_HAS_OMIT_FRAME_POINTER_FLAG
-- Performing Test COMPILER_RT_HAS_OMIT_FRAME_POINTER_FLAG - Success
-- Performing Test COMPILER_RT_HAS_FREESTANDING_FLAG
-- Performing Test COMPILER_RT_HAS_FREESTANDING_FLAG - Success
-- Performing Test COMPILER_RT_HAS_XRAY_COMPILER_FLAG
-- Performing Test COMPILER_RT_HAS_XRAY_COMPILER_FLAG - Success
-- Performing Test COMPILER_RT_HAS_ATOMIC_KEYWORD
-- Performing Test COMPILER_RT_HAS_ATOMIC_KEYWORD - Success
-- Builtin supported architectures: arm;armv6m
-- Looking for VFP_FP
-- Looking for VFP_FP - not found
-- Performing Test COMPILER_RT_TARGET_HAS_ATOMICS
-- Performing Test COMPILER_RT_TARGET_HAS_ATOMICS - Success
-- Performing Test COMPILER_RT_TARGET_HAS_FCNTL_LCK
-- Performing Test COMPILER_RT_TARGET_HAS_FCNTL_LCK - Success
-- Performing Test COMPILER_RT_TARGET_HAS_UNAME
-- Performing Test COMPILER_RT_TARGET_HAS_UNAME - Success
-- Configuring done
-- Generating done
-- Build files have been written to: /home/jake/pax/flutter_embedded/out/compiler-rt-prefix/src/compiler-rt-build
[2/36] Performing build step for 'compiler-rt'
FAILED: compiler-rt-prefix/src/compiler-rt-stamp/compiler-rt-build
cd /home/jake/pax/flutter_embedded/out/compiler-rt-prefix/src/compiler-rt-build && /opt/cmake/bin/cmake --build . && /opt/cmake/bin/cmake -E touch /home/jake/pax/flutter_embedded/out/compiler-rt-prefix/src/compiler-rt-stamp/compiler-rt-build
Scanning dependencies of target RTXrayBASIC.arm
[ 0%] Building CXX object lib/xray/CMakeFiles/RTXrayBASIC.arm.dir/xray_basic_flags.cc.o
[ 0%] Building CXX object lib/xray/CMakeFiles/RTXrayBASIC.arm.dir/xray_basic_logging.cc.o
In file included from /home/jake/pax/flutter_embedded/out/llvm/projects/compiler-rt/lib/xray/xray_basic_logging.cc:31:
/home/jake/pax/flutter_embedded/out/llvm/projects/compiler-rt/lib/xray/../../include/xray/xray_records.h:20:10: fatal error: 'cstdint' file not found
#include
^~~~~~~~~
1 error generated.
make[2]: *** [lib/xray/CMakeFiles/RTXrayBASIC.arm.dir/build.make:76: lib/xray/CMakeFiles/RTXrayBASIC.arm.dir/xray_basic_logging.cc.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:5365: lib/xray/CMakeFiles/RTXrayBASIC.arm.dir/all] Error 2
make: *** [Makefile:130: all] Error 2
ninja: build stopped: subcommand failed.

[jwinarske]

I'm thinking a missing include path.

In build_dependencies.cmake in the compiler-rt project, change "-DCMAKE_VERBOSE_MAKEFILE=${CMAKE_VERBOSE_MAKEFILE}" to "-DCMAKE_VERBOSE_MAKEFILE=TRUE". This will enable verbose without rebuilding clang. Provide this output for compiler-rt.

Provide output for /home/jake/pax/flutter_embedded/sdk/toolchain/bin/llvm-config --cxflags

Additions to include path, to affect compiler-rt, you would add it to CMAKE_CXX_FLAGS, in cmake/clang.toolchain.cmake.in

If you have the same sysroot somewhere I can download, I can give it a shot if you like.

[jakesays-old]

I know where the headers are in my sysroot, but since I'm building libcxx, isn't compiler-rt supposed to be using the libcxx headers?

[jwinarske]

Perhaps this will help. This is the verbose output of building for Raspberry Pi, for the first file in compiler-rt:

[  0%] Building CXX object lib/xray/CMakeFiles/RTXrayBASIC.armhf.dir/xray_basic_flags.cc.o
cd /home/joel/git/flutter_embedded/build/compiler-rt-prefix/src/compiler-rt-build/lib/xray && /home/joel/git/flutter_embedded/sdk/toolchain/bin/clang++ --sysroot=/home/joel/git/flutter_embedded/sdk/sysroot  -DXRAY_HAS_EXCEPTIONS=1 -DXRAY_SUPPORTED=1 -I/home/joel/git/flutter_embedded/build/llvm/projects/
compiler-rt/lib/xray/.. -I/home/joel/git/flutter_embedded/build/llvm/projects/compiler-rt/lib/xray/../../include  --target=arm-linux-gnueabihf -v --target=arm-linux-gnueabihf -v -Wall -std=c++11 -Wno-unused-parameter -Os -DNDEBUG    -march=armv7-a -mfloat-abi=hard -fPIC -fno-builtin -fno-exceptions -fom
it-frame-pointer -fno-stack-protector -fno-sanitize=safe-stack -fvisibility=hidden -fno-lto -O3 -gline-tables-only -Wno-gnu -Wno-variadic-macros -Wno-c99-extensions -Wno-non-virtual-dtor -fno-rtti -o CMakeFiles/RTXrayBASIC.armhf.dir/xray_basic_flags.cc.o -c /home/joel/git/flutter_embedded/build/llvm/pro
jects/compiler-rt/lib/xray/xray_basic_flags.cc

clang version 8.0.0 (trunk 351033)
Target: arm-unknown-linux-gnueabihf
Thread model: posix
InstalledDir: /home/joel/git/flutter_embedded/sdk/toolchain/bin
Found candidate GCC installation: /home/joel/git/flutter_embedded/sdk/sysroot/usr/lib/gcc/arm-linux-gnueabihf/4.6
Found candidate GCC installation: /home/joel/git/flutter_embedded/sdk/sysroot/usr/lib/gcc/arm-linux-gnueabihf/4.6.4
Found candidate GCC installation: /home/joel/git/flutter_embedded/sdk/sysroot/usr/lib/gcc/arm-linux-gnueabihf/4.7
Found candidate GCC installation: /home/joel/git/flutter_embedded/sdk/sysroot/usr/lib/gcc/arm-linux-gnueabihf/4.7.3
Found candidate GCC installation: /home/joel/git/flutter_embedded/sdk/sysroot/usr/lib/gcc/arm-linux-gnueabihf/4.8
Found candidate GCC installation: /home/joel/git/flutter_embedded/sdk/sysroot/usr/lib/gcc/arm-linux-gnueabihf/4.8.5
Found candidate GCC installation: /home/joel/git/flutter_embedded/sdk/sysroot/usr/lib/gcc/arm-linux-gnueabihf/4.9
Found candidate GCC installation: /home/joel/git/flutter_embedded/sdk/sysroot/usr/lib/gcc/arm-linux-gnueabihf/4.9.3
Found candidate GCC installation: /home/joel/git/flutter_embedded/sdk/sysroot/usr/lib/gcc/arm-linux-gnueabihf/5
Found candidate GCC installation: /home/joel/git/flutter_embedded/sdk/sysroot/usr/lib/gcc/arm-linux-gnueabihf/5.4.1
Found candidate GCC installation: /home/joel/git/flutter_embedded/sdk/sysroot/usr/lib/gcc/arm-linux-gnueabihf/6
Found candidate GCC installation: /home/joel/git/flutter_embedded/sdk/sysroot/usr/lib/gcc/arm-linux-gnueabihf/6.3.0
Selected GCC installation: /home/joel/git/flutter_embedded/sdk/sysroot/usr/lib/gcc/arm-linux-gnueabihf/6.3.0
Candidate multilib: .;@m32
Selected multilib: .;@m32
 "/home/joel/git/flutter_embedded/sdk/toolchain/bin/clang-8" -cc1 -triple armv7-unknown-linux-gnueabihf -emit-obj -disable-free -disable-llvm-verifier -discard-value-names -main-file-name xray_basic_flags.cc -mrelocation-model pic -pic-level 2 -mthread-model posix -fmath-errno -masm-verbose -mconstructor-aliases -fuse-init-array -target-cpu generic -target-abi aapcs-linux -mfloat-abi hard -fallow-half-arguments-and-returns -dwarf-column-info -debug-info-kind=line-tables-only -dwarf-version=4 -debugger-tuning=gdb -v -v -coverage-notes-file /home/joel/git/flutter_embedded/build/compiler-rt-prefix/src/compiler-rt-build/lib/xray/CMakeFiles/RTXrayBASIC.armhf.dir/xray_basic_flags.cc.gcno -resource-dir /home/joel/git/flutter_embedded/sdk/toolchain/lib/clang/8.0.0 -D XRAY_HAS_EXCEPTIONS=1 -D XRAY_SUPPORTED=1 -I /home/joel/git/flutter_embedded/build/llvm/projects/compiler-rt/lib/xray/.. -I /home/joel/git/flutter_embedded/build/llvm/projects/compiler-rt/lib/xray/../../include -D NDEBUG -isysroot /home/joel/git/flutter_embedded/sdk/sysroot -internal-isystem /home/joel/git/flutter_embedded/sdk/sysroot/usr/lib/gcc/arm-linux-gnueabihf/6.3.0/../../../../include/c++/6.3.0 -internal-isystem /home/joel/git/flutter_embedded/sdk/sysroot/usr/lib/gcc/arm-linux-gnueabihf/6.3.0/../../../../include/arm-linux-gnueabihf/c++/6.3.0 -internal-isystem /home/joel/git/flutter_embedded/sdk/sysroot/usr/lib/gcc/arm-linux-gnueabihf/6.3.0/../../../../include/arm-linux-gnueabihf/c++/6.3.0 -internal-isystem /home/joel/git/flutter_embedded/sdk/sysroot/usr/lib/gcc/arm-linux-gnueabihf/6.3.0/../../../../include/c++/6.3.0/backward -internal-isystem /home/joel/git/flutter_embedded/sdk/sysroot/usr/local/include -internal-isystem /home/joel/git/flutter_embedded/sdk/toolchain/lib/clang/8.0.0/include -internal-externc-isystem /home/joel/git/flutter_embedded/sdk/sysroot/usr/include/arm-linux-gnueabihf -internal-externc-isystem /home/joel/git/flutter_embedded/sdk/sysroot/include -internal-externc-isystem /home/joel/git/flutter_embedded/sdk/sysroot/usr/include -O3 -Wall -Wno-unused-parameter -Wno-gnu -Wno-variadic-macros -Wno-c99-extensions -Wno-non-virtual-dtor -std=c++11 -fdeprecated-macro -fdebug-compilation-dir /home/joel/git/flutter_embedded/build/compiler-rt-prefix/src/compiler-rt-build/lib/xray -ferror-limit 19 -fmessage-length 304 -fvisibility hidden -fno-builtin -fno-rtti -fno-signed-char -fobjc-runtime=gcc -fdiagnostics-show-option -fcolor-diagnostics -vectorize-loops -vectorize-slp -o CMakeFiles/RTXrayBASIC.armhf.dir/xray_basic_flags.cc.o -x c++ /home/joel/git/flutter_embedded/build/llvm/projects/compiler-rt/lib/xray/xray_basic_flags.cc -faddrsig
clang -cc1 version 8.0.0 based upon LLVM 8.0.0svn default target arm-linux-gnueabihf
ignoring duplicate directory "/home/joel/git/flutter_embedded/sdk/sysroot/usr/lib/gcc/arm-linux-gnueabihf/6.3.0/../../../../include/arm-linux-gnueabihf/c++/6.3.0"
#include "..." search starts here:
#include <...> search starts here:
 /home/joel/git/flutter_embedded/build/llvm/projects/compiler-rt/lib/xray/..
 /home/joel/git/flutter_embedded/build/llvm/projects/compiler-rt/lib/xray/../../include
 /home/joel/git/flutter_embedded/sdk/sysroot/usr/lib/gcc/arm-linux-gnueabihf/6.3.0/../../../../include/c++/6.3.0
 /home/joel/git/flutter_embedded/sdk/sysroot/usr/lib/gcc/arm-linux-gnueabihf/6.3.0/../../../../include/arm-linux-gnueabihf/c++/6.3.0
 /home/joel/git/flutter_embedded/sdk/sysroot/usr/lib/gcc/arm-linux-gnueabihf/6.3.0/../../../../include/c++/6.3.0/backward
 /home/joel/git/flutter_embedded/sdk/sysroot/usr/local/include
 /home/joel/git/flutter_embedded/sdk/toolchain/lib/clang/8.0.0/include
 /home/joel/git/flutter_embedded/sdk/sysroot/usr/include/arm-linux-gnueabihf
 /home/joel/git/flutter_embedded/sdk/sysroot/include
 /home/joel/git/flutter_embedded/sdk/sysroot/usr/include
End of search list.

[jakesays-old]

Ohh libc++ headers are under sdk/toolchain. Makes sense.

Only difference is mine are under sys/toolchain/include/c++/v1.

[jakesays-old]

It' sounds like we are working on very similar projects. I'd like to compare notes. Do you have an email address?

[jwinarske]

The toolchain is built with gcc. The app build uses the flag -stdlib=libc++, which then selects the proper headers, and lib.

[jakesays-old]

@jwinarske ah. i thought the support libs were supposed to be built with the just built clang.

[jakesays-old]

It looks like the new toolchain is being used to build the support libs. wouldn't it make sense to use libc++ headers instead of the g++ headers?

[jwinarske]

@JakeSays I just pushed. Try that.

[jakesays-old]

I pulled and built. Here's my error log (for the record I don't like cmake. it's basically configure+make with different syntax. I much prefer gn, where I can tell it exactly which tools to use and their settings, etc).

Two thinks of note:

1. the first two failures are using the wrong linker
2. the last failure i'm pretty sure is due to not linking against the new compiler_rt

Compiling the C compiler identification source file "CMakeCCompilerId.c" failed.
Compiler: /home/jake/pax/flutter_embedded/sdk/toolchain/bin/clang
Build flags: ;--target=arm-arm1176jzs-linux-gnueabi;--target=arm-arm1176jzs-linux-gnueabi
Id flags:

The output was:
1
/home/jake/pax/flutter_embedded/sdk/toolchain/bin/arm-arm1176jzs-linux-gnueabi-ld: cannot find crt1.o: No such file or directory
/home/jake/pax/flutter_embedded/sdk/toolchain/bin/arm-arm1176jzs-linux-gnueabi-ld: cannot find crti.o: No such file or directory
/home/jake/pax/flutter_embedded/sdk/toolchain/bin/arm-arm1176jzs-linux-gnueabi-ld: cannot find crtbegin.o: No such file or directory
/home/jake/pax/flutter_embedded/sdk/toolchain/bin/arm-arm1176jzs-linux-gnueabi-ld: cannot find -lgcc
/home/jake/pax/flutter_embedded/sdk/toolchain/bin/arm-arm1176jzs-linux-gnueabi-ld: cannot find -lgcc_s
/home/jake/pax/flutter_embedded/sdk/toolchain/bin/arm-arm1176jzs-linux-gnueabi-ld: cannot find -lc
/home/jake/pax/flutter_embedded/sdk/toolchain/bin/arm-arm1176jzs-linux-gnueabi-ld: cannot find -lgcc
/home/jake/pax/flutter_embedded/sdk/toolchain/bin/arm-arm1176jzs-linux-gnueabi-ld: cannot find -lgcc_s
/home/jake/pax/flutter_embedded/sdk/toolchain/bin/arm-arm1176jzs-linux-gnueabi-ld: cannot find crtend.o: No such file or directory
/home/jake/pax/flutter_embedded/sdk/toolchain/bin/arm-arm1176jzs-linux-gnueabi-ld: cannot find crtn.o: No such file or directory
clang-8: error: linker command failed with exit code 1 (use -v to see invocation)

Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" failed.
Compiler: /home/jake/pax/flutter_embedded/sdk/toolchain/bin/clang++
Build flags: ;--target=arm-arm1176jzs-linux-gnueabi;-I/home/jake/pax/flutter_embedded/sdk/sysroot/usr/include/c++/8.2.0;-I/home/jake/pax/flutter_embedded/sdk/sysroot/usr/include/c++/8.2.0/arm-arm1176jzs-linux-gnueabi;--target=arm-arm1176jzs-linux-gnueabi;-I/home/jake/pax/flutter_embedded/sdk/sysroot/usr/include/c++/8.2.0;-I/home/jake/pax/flutter_embedded/sdk/sysroot/usr/include/c++/8.2.0/arm-arm1176jzs-linux-gnueabi
Id flags:

The output was:
1
/home/jake/pax/flutter_embedded/sdk/toolchain/bin/arm-arm1176jzs-linux-gnueabi-ld: cannot find crt1.o: No such file or directory
/home/jake/pax/flutter_embedded/sdk/toolchain/bin/arm-arm1176jzs-linux-gnueabi-ld: cannot find crti.o: No such file or directory
/home/jake/pax/flutter_embedded/sdk/toolchain/bin/arm-arm1176jzs-linux-gnueabi-ld: cannot find crtbegin.o: No such file or directory
/home/jake/pax/flutter_embedded/sdk/toolchain/bin/arm-arm1176jzs-linux-gnueabi-ld: cannot find -lstdc++
/home/jake/pax/flutter_embedded/sdk/toolchain/bin/arm-arm1176jzs-linux-gnueabi-ld: cannot find -lm
/home/jake/pax/flutter_embedded/sdk/toolchain/bin/arm-arm1176jzs-linux-gnueabi-ld: cannot find -lgcc_s
/home/jake/pax/flutter_embedded/sdk/toolchain/bin/arm-arm1176jzs-linux-gnueabi-ld: cannot find -lgcc
/home/jake/pax/flutter_embedded/sdk/toolchain/bin/arm-arm1176jzs-linux-gnueabi-ld: cannot find -lc
/home/jake/pax/flutter_embedded/sdk/toolchain/bin/arm-arm1176jzs-linux-gnueabi-ld: cannot find -lgcc_s
/home/jake/pax/flutter_embedded/sdk/toolchain/bin/arm-arm1176jzs-linux-gnueabi-ld: cannot find -lgcc
/home/jake/pax/flutter_embedded/sdk/toolchain/bin/arm-arm1176jzs-linux-gnueabi-ld: cannot find crtend.o: No such file or directory
/home/jake/pax/flutter_embedded/sdk/toolchain/bin/arm-arm1176jzs-linux-gnueabi-ld: cannot find crtn.o: No such file or directory
clang-8: error: linker command failed with exit code 1 (use -v to see invocation)

Performing C++ SOURCE FILE Test LLVM_NO_OLD_LIBSTDCXX failed with the following output:
Change Dir: /home/jake/pax/flutter_embedded/out/libunwind-prefix/src/libunwind-build/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_fe24a/fast"
/usr/bin/make -f CMakeFiles/cmTC_fe24a.dir/build.make CMakeFiles/cmTC_fe24a.dir/build
make[1]: Entering directory '/home/jake/pax/flutter_embedded/out/libunwind-prefix/src/libunwind-build/CMakeFiles/CMakeTmp'
Building CXX object CMakeFiles/cmTC_fe24a.dir/src.cxx.o
/home/jake/pax/flutter_embedded/sdk/toolchain/bin/clang++ --sysroot=/home/jake/pax/flutter_embedded/sdk/sysroot --target=arm-arm1176jzs-linux-gnueabi -I/home/jake/pax/flutter_embedded/sdk/sysroot/usr/include/c++/8.2.0 -I/home/jake/pax/flutter_embedded/sdk/sysroot/usr/include/c++/8.2.0/arm-arm1176jzs-linux-gnueabi --target=arm-arm1176jzs-linux-gnueabi -I/home/jake/pax/flutter_embedded/sdk/sysroot/usr/include/c++/8.2.0 -I/home/jake/pax/flutter_embedded/sdk/sysroot/usr/include/c++/8.2.0/arm-arm1176jzs-linux-gnueabi -DLLVM_NO_OLD_LIBSTDCXX -std=c++0x -o CMakeFiles/cmTC_fe24a.dir/src.cxx.o -c /home/jake/pax/flutter_embedded/out/libunwind-prefix/src/libunwind-build/CMakeFiles/CMakeTmp/src.cxx
Linking CXX executable cmTC_fe24a
/opt/cmake/bin/cmake -E cmake_link_script CMakeFiles/cmTC_fe24a.dir/link.txt --verbose=1
/home/jake/pax/flutter_embedded/sdk/toolchain/bin/clang++ --sysroot=/home/jake/pax/flutter_embedded/sdk/sysroot --target=arm-arm1176jzs-linux-gnueabi -I/home/jake/pax/flutter_embedded/sdk/sysroot/usr/include/c++/8.2.0 -I/home/jake/pax/flutter_embedded/sdk/sysroot/usr/include/c++/8.2.0/arm-arm1176jzs-linux-gnueabi --target=arm-arm1176jzs-linux-gnueabi -I/home/jake/pax/flutter_embedded/sdk/sysroot/usr/include/c++/8.2.0 -I/home/jake/pax/flutter_embedded/sdk/sysroot/usr/include/c++/8.2.0/arm-arm1176jzs-linux-gnueabi -DLLVM_NO_OLD_LIBSTDCXX -std=c++0x -v -nodefaultlibs -L/home/jake/pax/flutter_embedded/sdk/toolchain/lib -lc -fuse-ld=gold -v -nodefaultlibs -L/home/jake/pax/flutter_embedded/sdk/toolchain/lib -lc -fuse-ld=gold CMakeFiles/cmTC_fe24a.dir/src.cxx.o -o cmTC_fe24a
clang version 8.0.0 (trunk 351134)
Target: arm-arm1176jzs-linux-gnueabi
Thread model: posix
InstalledDir: /home/jake/pax/flutter_embedded/sdk/toolchain/bin
Found candidate GCC installation: /home/jake/pax/flutter_embedded/sdk/sysroot/lib/gcc/arm-arm1176jzs-linux-gnueabi/8.2.0
Selected GCC installation: /home/jake/pax/flutter_embedded/sdk/sysroot/lib/gcc/arm-arm1176jzs-linux-gnueabi/8.2.0
Candidate multilib: .;@m32
Selected multilib: .;@m32
"/home/jake/pax/flutter_embedded/sdk/toolchain/bin/arm-arm1176jzs-linux-gnueabi-ld.gold" --sysroot=/home/jake/pax/flutter_embedded/sdk/sysroot -EL -z relro -X --hash-style=gnu --eh-frame-hdr -m armelf_linux_eabi -dynamic-linker /lib/ld-linux.so.3 -o cmTC_fe24a /home/jake/pax/flutter_embedded/sdk/sysroot/usr/lib/../lib/crt1.o /home/jake/pax/flutter_embedded/sdk/sysroot/usr/lib/../lib/crti.o /home/jake/pax/flutter_embedded/sdk/sysroot/lib/gcc/arm-arm1176jzs-linux-gnueabi/8.2.0/crtbegin.o -L/home/jake/pax/flutter_embedded/sdk/toolchain/lib -L/home/jake/pax/flutter_embedded/sdk/toolchain/lib -L/home/jake/pax/flutter_embedded/sdk/sysroot/lib/gcc/arm-arm1176jzs-linux-gnueabi/8.2.0 -L/home/jake/pax/flutter_embedded/sdk/sysroot/lib/gcc/arm-arm1176jzs-linux-gnueabi/8.2.0/../../../../lib -L/home/jake/pax/flutter_embedded/sdk/sysroot/lib/../lib -L/home/jake/pax/flutter_embedded/sdk/sysroot/usr/lib/../lib -L/home/jake/pax/flutter_embedded/sdk/sysroot/lib/gcc/arm-arm1176jzs-linux-gnueabi/8.2.0/../../.. -L/home/jake/pax/flutter_embedded/sdk/sysroot/lib -L/home/jake/pax/flutter_embedded/sdk/sysroot/usr/lib -lc -lc CMakeFiles/cmTC_fe24a.dir/src.cxx.o /home/jake/pax/flutter_embedded/sdk/sysroot/lib/gcc/arm-arm1176jzs-linux-gnueabi/8.2.0/crtend.o /home/jake/pax/flutter_embedded/sdk/sysroot/usr/lib/../lib/crtn.o
CMakeFiles/cmTC_fe24a.dir/src.cxx.o:src.cxx:function main: error: undefined reference to '__aeabi_f2iz'
CMakeFiles/cmTC_fe24a.dir/src.cxx.o:src.cxx:function std::atomic::load(std::memory_order) const: error: undefined reference to '__atomic_load_4'
CMakeFiles/cmTC_fe24a.dir/src.cxx.o(.ARM.extab.text._ZNKSt6atomicIfE4loadESt12memory_order+0x0): error: undefined reference to '__gxx_personality_v0'
CMakeFiles/cmTC_fe24a.dir/src.cxx.o:src.cxx:function __clang_call_terminate: error: undefined reference to '__cxa_begin_catch'
CMakeFiles/cmTC_fe24a.dir/src.cxx.o:src.cxx:function __clang_call_terminate: error: undefined reference to 'std::terminate()'
clang-8: error: linker command failed with exit code 1 (use -v to see invocation)
make[1]: *** [CMakeFiles/cmTC_fe24a.dir/build.make:87: cmTC_fe24a] Error 1
make[1]: Leaving directory '/home/jake/pax/flutter_embedded/out/libunwind-prefix/src/libunwind-build/CMakeFiles/CMakeTmp'
make: *** [Makefile:121: cmTC_fe24a/fast] Error 2

Source file was:

#include
std::atomic x(0.0f);
int main() { return (float)x; }

[jwinarske]

@JakeSays Well the last change I made only applies if this is not a bootstrap build, as the headers don't exist until the Install step of libcxx. I'm starting clean build folder tests now, will implement travis-ci soon. If you have a public sysroot, I can add that as a test case...

[jakesays-old]

Sounds good. I've decided to take a brief detour and experiment with bionic instead of libc.

My sysroot is an image of an old raspberry pi 1 soft float raspbian. the pi 1 minus floating point and a gpu is the same model as my target device.

[jwinarske]

Not planning to support unique cases for now. I will consider full support for cases where there is something publicly available. I am available for consult work.

[jakesays-old]

I'm curious - how is this a unique case?