Linking C++ #14466
Description
Description
When linking the usage of c++ is not always detected correctly, and thus the wrong linker is used resulting in linker errors.
Steps to reproduce the issue
Folder structure like this:
├── main.c
├── Makefile
└── src
├── blink.cpp
└── Makefile
Here's the contents of the files:
example.tar.gz
(If you want to try this you'll have to set the correct path for RIOT)
Expected results
Either g++ is used as a linker (which is down when there is an cpp file in the main application) or libstdc++ is also included in the link process when ld is used.
Actual results
gcc is used as a linker which doesn't link against libstdc++. Just adding a single empty file ending in .cpp makes RIOT use g++ as a linker
Versions
Operating System Environment
----------------------------
Operating System: "Arch Linux"
Kernel: Linux 5.7.7-arch1-1 x86_64 unknown
System shell: GNU bash, version 5.0.17(1)-release (x86_64-pc-linux-gnu)
make's shell: GNU bash, version 5.0.17(1)-release (x86_64-pc-linux-gnu)
Installed compiler toolchains
-----------------------------
native gcc: gcc (GCC) 10.1.0
arm-none-eabi-gcc: arm-none-eabi-gcc (Arch Repository) 10.1.0
avr-gcc: missing
mips-mti-elf-gcc: missing
msp430-gcc: missing
riscv-none-embed-gcc: missing
xtensa-esp32-elf-gcc: missing
xtensa-esp8266-elf-gcc: missing
clang: clang version 10.0.0
Installed compiler libs
-----------------------
arm-none-eabi-newlib: "3.3.0"
mips-mti-elf-newlib: missing
riscv-none-embed-newlib: missing
xtensa-esp32-elf-newlib: missing
xtensa-esp8266-elf-newlib: missing
avr-libc: missing (missing)
Installed development tools
---------------------------
ccache: ccache version 3.7.9
cmake: cmake version 3.17.3
cppcheck: Cppcheck 2.1
doxygen: missing
git: git version 2.27.0
make: GNU Make 4.3
openocd: Open On-Chip Debugger 0.10.0
python: Python 3.8.3
python2: Python 2.7.18
python3: Python 3.8.3
flake8: error: /sbin/python3: No module named flake8
coccinelle: missing