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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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