#3489 Optional file type override -x stopped working

[Deqing Sun]

When doing something like

/Users/sundeqing/Desktop/untitledfolder2/sdcc/sdcc/bin/sdcc -c -E -MC -mmcs51 -x c /Users/sundeqing/Desktop/untitledfolder2/build/sketch/sketch_sep18a.ino.cpp -o /Users/sundeqing/Desktop/untitledfolder2/build/preproc/ctags_target_for_gcc_minus_e.cpp

The v13706 will throw

sdcpp: error: /Users/sundeqing/Desktop/untitledfolder2/build/sketch/sketch_sep18a.ino.cpp: C++ compiler not installed on this system

But the v13407 worked.

This was how Benedikt Freisen explained this feature. https://github.com/tenbaht/sduino/issues/120

[Benedikt Freisen]

sdcpp received a major update very recently, namely from version 4.6.3 to version 12.1.0.
Apparently, it now tries to invoke a nonexistent C++ compiler.

Maybe -x c is not forwarded to sdcpp.

[Deqing Sun]

This seems to be the reason.

sdcc/bin/sdcpp -E sketch_sep18a.ino.cpp -o test.c
sdcpp: error: sketch_sep18a.ino.cpp: C++ compiler not installed on this system

sdcc/bin/sdcpp -x c -E sketch_sep18a.ino.cpp -o test.c

The second one seems to be OK.

[Felix]

From [r13710], we pass -xc to the preprocessor, effectively hardwiring "C" as the input language.

Now, it is not required to set the -xc flag when compiling code from files with .cpp extension, but it won't hurt. I'm not sure if this needs changing in the future.