[cfe-dev] Clang tooling and cross compiled code bases

Andrew McGregor andrewmcgr at gmail.com
Mon Sep 10 17:09:58 PDT 2012

On 10/09/2012, at 5:56 PM, Manuel Klimek <klimek at google.com> wrote:

> When I try to compile this (no tooling involved, just plain clang):
> $ ~/build/llvm/bin/clang -c t2.c -fno-signed-char
> clang-3: warning: argument unused during compilation: '-fno-signed-char'
> <...>
> According to chandlerc the right way to pass this to clang is to use
> -funsigned-char. Unfortunately that doesn't make the code snippet
> compile either:
> $ ~/build/llvm/bin/clang -c t2.c -funsigned-char
> t2.c:12:10: warning: passing 'uint8_t [5]' to parameter of type 'char
> *' converts between pointers to integer types with different sign
> [-Wpointer-sign]
> <...>
> So, that doesn't really seem to be a reduction of the problem you're seeing.
> -internal-isystem (I assume you meant that instead of
> "-isystem-internal") is a red herring, too - it shouldn't be in a
> compilation database, it's an internal flag.

Sure is, but for some reason I couldn't use just -isystem.  I guess I should revisit that problem.

Context is, the compilation database is synthetic; the project compiles with gcc, but I have to manufacture a compilation database for the benefit of static analysis and refactoring tools.

> Cheers,
> /Manuel

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