Date: Thu, 23 Nov 2017 12:02:53 +0100 From: Szabolcs Nagy <nsz@...t70.net> To: musl@...ts.openwall.com Subject: Re: Linux headers for musl (was: Compiling libpcap from source using musl and clang) * Assaf Gordon <assafgordon@...il.com> [2017-11-23 01:03:21 -0700]: > On 2017-11-20 12:31 PM, Rich Felker wrote: > > On Mon, Nov 20, 2017 at 02:02:43PM -0500, Hamed Ghavamnia wrote: > > > [...] > > > The problem I'm currently facing is that the source codes require header > > > files such as linux/types.h, but there isn't any linux sub folder in the > > > include folder of my compiled musl library. > > > > [...] Otherwise you can install them yourself from the > > kernel sources or if you're using compiler wrappers on a glibc-based > > system you can make symlinks to the copies of the Linux headers in the > > glibc include dir (/usr/include/linux, etc.). > > I encountered a similar issue when building libreSSL with musl > (on standard ubuntu 16.04 x86_64 machine). > > The solution I've found is: > > apt-get install -y linux-libc-dev > ln -s /usr/include/linux $MUSLROOT/include > ln -s /usr/include/asm-generic $MUSLROOT/include > ln -s /usr/include/x86_64-linux-gnu $MUSLROOT/include > ... > My ugly work-around was: > > cd $muslroot/include > ln -s x86_64-linux-gnu/asm asm > > > Is this the recommended way? no, the recommended way is to use a cross toolchain that is built for musl (and has the linux headers installed), instead of using your platform toolchain with various hacks (like the musl-gcc wrapper around gcc) in case you prefer musl-gcc then you should install your deps to $MUSLROOT instead of trying to use platform components, this includes library and header deps as well, so get linux sources and install the headers yourself make ARCH=x86 INSTALL_HDR_PATH=staging O=builddir headers_install cp -a -n staging/include $MUSLROOT (not tested) (note that the ubuntu toolchain uses 'multi-arch' layout for the include and library paths, but musl-gcc drops all platform specific include paths and uses its own (standard) layout, so symlinking stuff from ubuntu include path like 'x86_64-linux-gnu' wont work)
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