Date: Wed, 21 Sep 2011 17:45:57 -0400 From: Rich Felker <dalias@...ifal.cx> To: musl@...ts.openwall.com Subject: Re: New INSTALL guide, request for feedback On Wed, Sep 21, 2011 at 11:19:10PM +0200, Szabolcs Nagy wrote: > * Rich Felker <dalias@...ifal.cx> [2011-09-21 16:03:37 -0400]: > > Feedback would be appreciated! > > > > looks reasonable > > > sometimes i use musl without installation > - checkout git repo > - edit config.mak, run make > - use the git repo include/ and lib/ paths directly with -isystem, -L > and the -nostd*, crt*.o, -dynamic-linker etc hackery > > works well for single file compilations (without dynamic linking > to other libraries) i have a makefile setup for this and just > copy it around when i want to do some quick testing This works a lot better if you just modify the musl-gcc script to use the source tree as your libc_prefix. I'll mention that in the INSTALL file... > > gcc 3.x and 4.x are known to work. pcc and LLVM/clang may work but > > are untested, and pcc is known to have some bugs. > > > when building libc.so with other compiler than gcc > the -lgcc in the makefile should be (obviously) changed > (this is the only change needed for pcc that i know of) OK. > (when compiling other code with pcc+musl a -Dalloca=__builtin_alloca is > needed as well, glibc does this define so i guess that's why they don't) I should probably just add that. > > Correctly-written build systems should not need -D_GNU_SOURCE as part > > of $CC, but many programs do not use feature-test macros correctly and > actually musl does not do fine grain feature testing wrt _BSD_SOURCE > so some correct programs expecting bsd stuff may need _GNU_SOURCE too > (eg quad_t or some xsi functions with bsd origin) Well unless a program is using purely standard features, I would include in the definition of "correct" a requirement that it probe in the configure script how to get the nonstandard features it wants... i.e. try several different feature test macros, etc. Rich
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