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We use a C compiler for embedded systems that doesn't support link time optimizations (unless you pay for the pro version, that is). I have been thinking about some tool like this that merges all C source files for compilation.

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That's called a "unity" build, isn't it? I was under the impression that it was a relatively well-known technique, such that there are existing tools to merge a set of source files into a single .c file.

Unless i am understanding you wrong, you could easily do this by #including all your a.c, b.c etc. into one file input.c and feeding that to the compiler.

We did this for a home-grown SoC with a gcc port for which there was no linker.

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