Cannot Compile C code with Intel

[everythingfunctional]

The current method of allowing C code in a project does not allow compiling with the Intel compilers. Other compilers (I've tried gfortran, nagfor and nvfortran) recognize the .c extension and just work, although I do get the following warning from gfortran:

cc1: warning: command-line option ‘-Wimplicit-interface’ is valid for Fortran but not for C
cc1: warning: command-line option ‘-fcheck=bounds’ is valid for Fortran but not for C
cc1: warning: command-line option ‘-fcheck=array-temps’ is valid for Fortran but not for C
cc1: warning: command-line option ‘-fbacktrace’ is valid for Fortran but not for C
cc1: warning: command-line option ‘-fcoarray=single’ is valid for Fortran but not for C

But the Intel compilers (both ifort and ifx), issue the following message, and do not compile the C code.

ifort: warning #10145: no action performed for file './src/say_hello.c'

I'm guessing one must explicitly compile C code with icc (or icx) in order to mix C and Fortran with Intel.