[Bug 1375071] Re: g++-arm-linux-gnueabi cannot compile a C++ program with --sysroot

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: gcc-defaults-armhf-cross (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1375071

Title:
  g++-arm-linux-gnueabi  cannot compile a C++ program with --sysroot

Status in gcc-defaults-armel-cross package in Ubuntu:
  Confirmed
Status in gcc-defaults-armhf-cross package in Ubuntu:
  Confirmed

Bug description:
  g++-arm-linux-gnueabi  cannot compile a C++ program with --sysroot. It
  appears there are problems with the built-in paths used for the C++
  headers.

  The rest of the report just dumps information. But to summarize the
  dump...

  We need the paths:

    A) /usr/arm-linux-gnueabi/include/c++/4.7.3
    B) /usr/arm-linux-gnueabi/include/c++/4.7.3/arm-linux-gnueabi

  But the built-in paths tries to use:

    C) /usr/arm-linux-gnueabi/usr/arm-linux-gnueabi/include/c++/4.7.3
    D) /usr/arm-linux-gnueabi/usr/arm-linux-gnueabi/include/c++/4.7.3/arm-linux-gnueabi/sf
    E) /usr/arm-linux-gnueabi/usr/arm-linux-gnueabi/include/c++/4.7.3/backward

  Notice the built-in paths use an extra "/usr/arm-linux-gnueabi"

  *****

  Ubuntu 14.04 (x64), fully patched. gcc-arm-linux-gnueabi  and g++-arm-
  linux-gnueabi  are installed.

  $ uname -sm
  Linux x86_64

  $ lsb_release -a
  No LSB modules are available.
  Distributor ID:	Ubuntu
  Description:	Ubuntu 14.04.1 LTS
  Release:	14.04
  Codename:	trusty

  *****

  $ /usr/bin/arm-linux-gnueabi-g++ --version
  arm-linux-gnueabi-g++ (Ubuntu/Linaro 4.7.3-12ubuntu1) 4.7.3
  Copyright (C) 2012 Free Software Foundation, Inc.

  And:

  $ ls /usr/arm-linux-gnueabi
  bin  include  lib

  And:

  $ cat embedded.cpp
  #include <iostream>

  int main(int argc, char* argv[])
  {
      std::cout << "Hello World" << std::endl;
      return 0;
  }

  *****

  $ /usr/bin/arm-linux-gnueabi-g++ --sysroot=/usr/arm-linux-gnueabi embedded.cpp -o embedded.exe
  embedded.cpp:1:20: fatal error: iostream: No such file or directory
  compilation terminated.

  *****

  It appears the C++ headers are not included with SYSROOT. If I add the
  C++ header paths, then the compile is successful:

  $ /usr/bin/arm-linux-gnueabi-g++ -I/usr/arm-linux-gnueabi/include/c++/4.7.3 -I/usr/arm-linux-gnueabi/include/c++/4.7.3/arm-linux-gnueabi --sysroot=/usr/arm-linux-gnueabi embedded.cpp -o embedded.exe
  $

  And:

  $ /usr/bin/arm-linux-gnueabi-readelf readelf -h ./embedded.exe | grep -i 'class\|machine' 
  readelf: Error: 'readelf': No such file
    Class:                             ELF32
    Machine:                           ARM

  *****

  From http://wiki.ubuntu.com/ToolChain:

  $ /usr/bin/arm-linux-gnueabi-g++ -v -E - < /dev/null 2>&1 | awk '/^#include/,/^End of search/' | grep '^ '
   /usr/lib/gcc-cross/arm-linux-gnueabi/4.7/include
   /usr/lib/gcc-cross/arm-linux-gnueabi/4.7/include-fixed
   /usr/lib/gcc-cross/arm-linux-gnueabi/4.7/../../../../arm-linux-gnueabi/include
   /usr/include

  *****

  However, there's actually more to the paths than shown on ToolChain
  wiki, and this shows the incorrect C++ lookups. There's an extra '/usr
  /arm-linux-gnueabi/' in the paths being used:

  $ /usr/bin/arm-linux-gnueabi-g++ -v --sysroot=/usr/arm-linux-gnueabi embedded.cpp -o embedded.exe
  Using built-in specs.
  COLLECT_GCC=/usr/bin/arm-linux-gnueabi-g++
  ...
  GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
  ignoring nonexistent directory "/usr/arm-linux-gnueabi/usr/arm-linux-gnueabi/include/c++/4.7.3"
  ignoring nonexistent directory "/usr/arm-linux-gnueabi/usr/arm-linux-gnueabi/include/c++/4.7.3/arm-linux-gnueabi/sf"
  ignoring nonexistent directory "/usr/arm-linux-gnueabi/usr/arm-linux-gnueabi/include/c++/4.7.3/backward"
  ignoring nonexistent directory "/usr/arm-linux-gnueabi/usr/local/include/arm-linux-gnueabi"
  ignoring nonexistent directory "/usr/arm-linux-gnueabi/usr/include/arm-linux-gnueabi"
  ignoring nonexistent directory "/usr/arm-linux-gnueabi/usr/include"
  #include "..." search starts here:
  #include <...> search starts here:
   /usr/lib/gcc-cross/arm-linux-gnueabi/4.7/include
   /usr/lib/gcc-cross/arm-linux-gnueabi/4.7/include-fixed
   /usr/lib/gcc-cross/arm-linux-gnueabi/4.7/../../../../arm-linux-gnueabi/include
  End of search list.
  ...

  *****

  $ /usr/bin/arm-linux-gnueabi-g++ -v
  Using built-in specs.
  COLLECT_GCC=/usr/bin/arm-linux-gnueabi-g++
  COLLECT_LTO_WRAPPER=/usr/lib/gcc-cross/arm-linux-gnueabi/4.7/lto-wrapper
  Target: arm-linux-gnueabi
  Configured with: ../src/configure -v --with-pkgversion='Ubuntu/Linaro 4.7.3-12ubuntu1' --with-bugurl=file:///usr/share/doc/gcc-4.7/README.Bugs --enable-languages=c,c++,go,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-4.7 --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/arm-linux-gnueabi/include/c++/4.7.3 --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-gnu-unique-object --disable-libmudflap --disable-libitm --enable-plugin --with-system-zlib --enable-objc-gc --with-cloog --enable-cloog-backend=ppl --disable-cloog-version-check --disable-ppl-version-check --enable-multiarch --enable-multilib --disable-sjlj-exceptions --with-arch=armv5t --with-float=soft --disable-werror --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=arm-linux-gnueabi --program-prefix=arm-linux-gnueabi- --includedir=/usr/arm-linux-gnueabi/include
  Thread model: posix
  gcc version 4.7.3 (Ubuntu/Linaro 4.7.3-12ubuntu1)

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