Cpptools integration does not respect sysroot and compiler flags when crosscompiling

[bjosa]

Brief Issue Summary

Using a cross compile toolchain e.g. cortexa9t2hf-neon-linux-gnueabi with a sysroot folder for the target filesystem.
The CMake toolchain file sets architecture specific compile flags and the CMAKE_SYSROOT variable.

When using the cpptools integration, to autoconfigure the Microsoft C/C++ cpptools Extension, these flags and the sysroot folder are not respected from the cpptools extension. Seems cmake-tools does not hand these settings over to the cpptools extension.

We get error squiggles for not existing header files and incorrect intellisens due to wrong defines that describe the architectur e.g. hard-float vs. soft-float.

Wrong:

cpptools extension output:

Custom configurations received:
  uri: file:///c%3A/.../test.cpp
  config: {
  "defines": [],
  "standard": "c++17",
  "includePath": [
    "C:/...test/src",
    "C:/.../test/build/src",
    "C:/.../test/include",
    "C:/sdk/sysroots/cortexa9t2hf-neon-linux-gnueabi/usr/include/testlib"
  ],
  "intelliSenseMode": "clang-x64",
  "compilerPath": "C:/sdk/sysroots/x86_64-pokysdk-mingw32/usr/bin/arm-linux-gnueabi/arm-linux-gnueabi-g++.exe"
}
Custom browse configuration received: {
  "browsePath": [
    "C:/.../test/include",
    "C:/sdk/sysroots/cortexa9t2hf-neon-linux-gnueabi/usr/include/testlib",
    "C:/.../test/src",
    "C:/.../test/build/src"
  ],
  "standard": "c++17",
  "compilerPath": "C:/sdk/sysroots/x86_64-pokysdk-mingw32/usr/bin/arm-linux-gnueabi/arm-linux-gnueabi-g++.exe"
}
...
sending compilation args for C:\...\TEST\SRC\HEWO\TEST.CPP
  include: C:\...\TEST\SRC
  include: C:\...\TEST\BUILD\SRC
  include: C:\...\TEST\INCLUDE
  include: C:\SDK\SYSROOTS\cortexa9t2hf-neon-linux-GNUEABI\USR\INCLUDE\TESTLIB
  include: C:\SDK\SYSROOTS\X86_64-POKYSDK-MINGW32\USR\LIB\ARM-LINUX-GNUEABI\GCC\ARM-LINUX-GNUEABI\6.2.0\INCLUDE
  include: C:\SDK\SYSROOTS\X86_64-POKYSDK-MINGW32\USR\LIB\ARM-LINUX-GNUEABI\GCC\ARM-LINUX-GNUEABI\6.2.0\INCLUDE-FIXED
  define: __STDC__=1
  define: __cplusplus=201500L
  define: __STDC_UTF_16__=1
  define: __STDC_UTF_32__=1
  define: __STDC_HOSTED__=1
  define: __GNUC__=6
  define: __GNUC_MINOR__=2
  define: __GNUC_PATCHLEVEL__=0
  define: __VERSION__="6.2.0"
  ...

Expected:

cpptools extension output:

Custom configurations received:
  uri: file:///c%3A/.../test/src/hewo/test.cpp
  config: {
  "defines": [],
  "standard": "c++17",
  "includePath": [
    "C:/.../test/src",
    "C:/.../test/build/src",
    "C:/.../test/include",
    "C:/sdk/sysroots/cortexa9t2hf-neon-linux-gnueabi/usr/include/testlib"
  ],
  "intelliSenseMode": "clang-x64",
  "compilerPath": "C:/sdk/sysroots/x86_64-pokysdk-mingw32/usr/bin/arm-linux-gnueabi/arm-linux-gnueabi-g++.exe -march=armv7-a -mthumb -mfpu=neon -mfloat-abi=hard -mcpu=cortex-a9 -g --sysroot=C:/sdk/sysroots/cortexa9t2hf-neon-linux-gnueabi"
}
Custom browse configuration received: {
  "browsePath": [
    "C:/.../test/include",
    "C:/sdk/sysroots/cortexa9t2hf-neon-linux-gnueabi/usr/include/testlib",
    "C:/.../test/src",
    "C:/.../test/build/src"
  ],
  "standard": "c++17",
  "compilerPath": "C:/sdk/sysroots/x86_64-pokysdk-mingw32/usr/bin/arm-linux-gnueabi/arm-linux-gnueabi-g++.exe -march=armv7-a -mthumb -mfpu=neon -mfloat-abi=hard -mcpu=cortex-a9 -g --sysroot=C:/sdk/sysroots/cortexa9t2hf-neon-linux-gnueabi"
}
...
sending compilation args for C:\...\TEST\SRC\HEWO\TEST.CPP
  include: C:\...\TEST\SRC
  include: C:\...\TEST\BUILD\SRC
  include: C:\...\TEST\INCLUDE
  include: C:\SDK\SYSROOTS\CORTEXA9T2HF-NEON-LINUX-GNUEABI\USR\INCLUDE\TESTLIB
  include: C:\SDK\SYSROOTS\X86_64-POKYSDK-MINGW32\USR\LIB\ARM-LINUX-GNUEABI\GCC\ARM-LINUX-GNUEABI\6.2.0\INCLUDE
  include: C:\SDK\SYSROOTS\X86_64-POKYSDK-MINGW32\USR\LIB\ARM-LINUX-GNUEABI\GCC\ARM-LINUX-GNUEABI\6.2.0\INCLUDE-FIXED
  include: C:\SDK\SYSROOTS\CORTEXA9T2HF-NEON-LINUX-GNUEABI\USR\INCLUDE\C++\6.2.0
  include: C:\SDK\SYSROOTS\CORTEXA9T2HF-NEON-LINUX-GNUEABI\USR\INCLUDE\C++\6.2.0\ARM-LINUX-GNUEABI
  include: C:\SDK\SYSROOTS\CORTEXA9T2HF-NEON-LINUX-GNUEABI\USR\INCLUDE\C++\6.2.0\BACKWARD
  include: C:\SDK\SYSROOTS\CORTEXA9T2HF-NEON-LINUX-GNUEABI\USR\LIB\GCC\ARM-LINUX-GNUEABI\6.2.0\INCLUDE
  include: C:\SDK\SYSROOTS\CORTEXA9T2HF-NEON-LINUX-GNUEABI\USR\INCLUDE
  define: __STDC__=1
  define: __cplusplus=201500L
  define: __STDC_UTF_16__=1
  define: __STDC_UTF_32__=1
  define: __STDC_HOSTED__=1
  define: __GNUC__=6
  define: __GNUC_MINOR__=2
  define: __GNUC_PATCHLEVEL__=0
  define: __VERSION__="6.2.0"
  ...
  define: __VFP_FP__=1
  define: __ARM_FP=12
  define: __ARM_NEON__=1
  define: __ARM_NEON=1
  define: __ARM_NEON_FP=4
  ...

Note that the compiler flags and the sysroot is appended to the compilerPath for the cpptools configuration.

Platform and Versions

• Operating System: Windows 10
• CMake Version: 3.13.0-rc3
• VSCode Version: 1.30.2
• CMake Tools Extension Version: 1.1.3
• Microsoft C/C++ cpptools Extension Version: 0.20.1
• Compiler/Toolchain: gcc-6.2.0 (arm-linux-gnueabi)

[bobbrow]

This issue has been addressed in CMake Tools 1.2.0 which is available in the VS Code Marketplace or on the Releases Page

Because the publisher id has changed, VS Code does not automatically upgrade you yet. The Marketplace team will enable this in the next few days. If you want to install 1.2.0 now, please make sure you uninstall any earlier versions of CMake Tools manually to avoid any conflicts.