For meson, the -std is not defined

[ilg-ul]

Extracted from #6 (comment)

Here is the command line generated for the .cpp file:

g++ -Ihello-world.p -I. -I../.. -I../../include -I../../libs/adder/include -fdiagnostics-color=always -pipe -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -Wnon-virtual-dtor -g -DDEBUG -fmessage-length=0 -fsigned-char -ffunction-sections -fdata-sections -fno-omit-frame-pointer -MD -MQ hello-world.p/src_hello-world.cpp.o -MF hello-world.p/src_hello-world.cpp.o.d -o hello-world.p/src_hello-world.cpp.o -c ../../src/hello-world.cpp

Obviously, gnu++17 didn't find its way to the command line.

[ilg-ul]

Fixed on 2021-06-26.