Pierre Labastie wrote:
On 23/01/2016 03:56, Bruce Dubbs wrote:
William Harrington wrote:
On Fri, January 22, 2016 18:54, Bruce Dubbs wrote:
I'm thinking about changing the way we build packages in separate
directories. What we do now for tool chain packages is:
mkdir -v ../binutils-build
cd ../binutils-build
../binutils-2.25.1/configure ...
I'm thinking about changing that to:
mkdir -v build
cd build
../configure ...
Hello Bruce,
[...]
We have stuck with this for the longest time:
https://gcc.gnu.org/install/configure.html
"First, we highly recommend that GCC be built into a separate directory
from the sources which does not reside within the source tree. This is how
we generally build GCC; building where srcdir == objdir should still work,
but doesn't get extensive testing; building where objdir is a subdirectory
of srcdir is unsupported."
When I read that, I interpret is to mean that they build for multiple targets
and want to keep the object files from those builds separate.
I've modified LFS according to the attached diff. I did a full build and the
failures in the test logs are the same as with the current book.
Actually I cannot think of a good reason for differentiation between the case
where objdir is completely separate from srcdir and the case where objdir is a
subdirectory of srcdir, even though they say that case is unsupported. About
the only thing I can think of is that they may be doing some kind of recursive
directory search and there is some sort of match in the build tree.
Definitely, building with srcdir == objdir does not work: I tried that when I
saw this thread, and it failed at gcc-pass1. It looks like "make" does not get
the build order right in this case (I tried both with -j5 and -j1, and got the
same error), or misses some dependency:
I definitely did not propose that. The question where does the separate
objdir need to be? I've been thinking about this some more and and will
post a summary of my thought later today.
-- Bruce
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