Date: Thu, 1 Mar 2018 16:20:47 -0500 From: Rich Felker <dalias@...c.org> To: musl@...ts.openwall.com Subject: Re: Generating headers for a specific target On Thu, Mar 01, 2018 at 10:12:26PM +0100, EJ wrote: > Hi Rich, > > > On 1 Mar 2018, at 21:59, Rich Felker <dalias@...c.org> wrote: > > > > On Thu, Mar 01, 2018 at 09:49:42PM +0100, EJ wrote: > >> Hello, > >> > >> Is there a way to generate the headers for a specific target without > >> having access to the target or a cross-compiler for the target? > >> > >> I’m not interested in compiling must, just in a complete set of header files. > > > > Yes, with a few caveats. Keep in mind that for archs with subarchs, > > there will be preprocessor conditionals in the bits headers which > > depend on predefined macros from the compiler, so you can't > > use/process the headers without knowing the values of those macros. > > Understood. I’m still planning to run the headers through a properly > configured compiler fornt-end, so that shouldn’t be a problem. > > > With that said, something like this should work from a clean tree: > > > > make includedir=/where/you/want/them ARCH=whatever install-headers > > > > or out-of-tree in a clean dir: > > > > make -f /path/to/musl/Makefile srcdir=/path/to/musl \ > > includedir=/where/you/want/them ARCH=whatever install-headers > > > > filling in ARCH=whatever with the musl name for the target arch (not > > including the subarch part). > > The above works like a charm. > > > The above make invocations are not entirely documented/public > > interfaces, but are probably 90% so and unlikely to change/break in > > practice. It might be a good idea to check that they still work with > > new versions when upgrading musl though. > > Understandable. > > Thanks for your quick and informative response! No problem. Also note that, if you are building compilers, you can pause in the middle to build & install the musl headers; the musl-cross-make repo has an example of how to do this with gcc, which is roughly: 1. GCC: make all-gcc 2. musl: configure (using xgcc) and make install-headers 3. GCC: make all-target-libgcc with disable_shared forced 4. musl: make, make install to build sysroot 5. GCC: make all Rich
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