I want to use clang for cross compiling. I've found out that it seems very easy, I can specify architectures/includes etc. just as I invoke clang directly.
However, I don't want to keep passing those flags, I'd rather compile clang so that it would have these by default.
That is, when I invoke clang just as clang++ main.cpp I'd like it to become clang++ -i686-w64-mingw32 -target-isystem=/usr/some/path main.cpp etc, how can I do that?
You can use a response file to do this sort of thing, it's also how you'd avoid command lines that are too long for your OS.
Something like:
clang @target_cmds.inc -c foo.c
will likely work for you.
(In addition to the earlier comments of some build system hackery or an alias, you could also define clang as a wrapper script that you invoke that does the same thing, e.g.:
#!/bin/sh
clang -target i686-w64-mingw32 -target-isystem=/usr/some/path $@