Pierre Labastie wrote:
Le 06/10/2014 01:12, Christer Solskogen a écrit :
On 05.10.2014 10:06, Cifer Lee wrote:
I noticed that when compiling gcc, we passed the --with-newlib option,
I know newlib is a lightweight C library, but where is the newlib's
source code?
You don't really need to pass --with-newlib in the first place.
Well,
I read in gcc./configure (version 4.9.1):
---------------
# If this is using newlib, without having the headers available now,
# then define inhibit_libc in LIBGCC2_CFLAGS.
# This prevents libgcc2 from containing any code which requires libc
# support.
: ${inhibit_libc=false}
if { { test x$host != x$target && test "x$with_sysroot" = x ; } ||
test x$with_newlib = xyes ; } &&
{ test "x$with_headers" = x || test "x$with_headers" = xno ; } ; then
inhibit_libc=true
fi
-------------
Since we do not want libgcc2 to containing any code which requires libc
support, we pass --with-newlib --without-headers (equivalent to
--with-headers=no). And this is needed!
Exactly. In addition, this is only in effect from the end of Section
5.5 to 5.10 (gcc-pass2). Even if it was not needed, then it would be a
negligible impact.
However, it is needed to isolate gcc from the host system.
-- Bruce
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