Change a C library function to get rid of implicit const cast warnings from g++ [duplicate]

I want to get rid of compiler warnings when calling certain C functions from C++.

Given the following function in a C library:

void log_something(char * message);

It is used in both C and C++ code. When called with a string literal, the C compiler thinks everything is peachy. The C++ compiler gives this stern warning but produces a binary:

log_something("This is a log message");

WME.cpp:7:35: warning: ISO C++ forbids converting a string constant to ‘char*’ [-Wwrite-strings]

If instead of a string literal or a char * I pass a char const *, I get a warning from the C ompiler and an error from the C++ compiler.

MWE.c:9:19: warning: passing argument 1 of ‘log_something’ discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
MWE.cpp:11:19: error: invalid conversion from ‘const char*’ to ‘char*’ [-fpermissive]

Assuming I have verified that log_something(message) does not modify *message in any way, is it safe to change the function to take a char const * instead of a char *?

Existing C and C++ code must continue to work without modification after the function is changed (re-compiling for updated library is allowed, but nice if it can be avoided).

Simple tests suggests it should work, but I'm worried there might be an edge case I haven't thought about.