FAQ: Remove the entire Build Problems section

This is all horribly outdated, and is mostly about the autoconf build
system that doesn't even exist anymore. These questions aren't
frequent, and these answers aren't useful.

llvm-svn: 264141

diff --git a/llvm/docs/FAQ.rst b/llvm/docs/FAQ.rst
index 78c5440..0ab99f3 100644 (file)
--- a/llvm/docs/FAQ.rst
+++ b/llvm/docs/FAQ.rst
@@ -75,131 +75,6 @@ reference. In fact, the names of dummy numbered temporaries like ``%1`` are
 not explicitly represented in the in-memory representation at all (see
 ``Value::getName()``).
 
-Build Problems
-==============
-
-When I run configure, it finds the wrong C compiler.
-----------------------------------------------------
-The ``configure`` script attempts to locate first ``gcc`` and then ``cc``,
-unless it finds compiler paths set in ``CC`` and ``CXX`` for the C and C++
-compiler, respectively.
-
-If ``configure`` finds the wrong compiler, either adjust your ``PATH``
-environment variable or set ``CC`` and ``CXX`` explicitly.
-
-
-The ``configure`` script finds the right C compiler, but it uses the LLVM tools from a previous build.  What do I do?
----------------------------------------------------------------------------------------------------------------------
-The ``configure`` script uses the ``PATH`` to find executables, so if it's
-grabbing the wrong linker/assembler/etc, there are two ways to fix it:
-
-#. Adjust your ``PATH`` environment variable so that the correct program
-   appears first in the ``PATH``.  This may work, but may not be convenient
-   when you want them *first* in your path for other work.
-
-#. Run ``configure`` with an alternative ``PATH`` that is correct. In a
-   Bourne compatible shell, the syntax would be:
-
-.. code-block:: console
-
-   % PATH=[the path without the bad program] $LLVM_SRC_DIR/configure ...
-
-This is still somewhat inconvenient, but it allows ``configure`` to do its
-work without having to adjust your ``PATH`` permanently.
-
-
-When creating a dynamic library, I get a strange GLIBC error.
--------------------------------------------------------------
-Under some operating systems (i.e. Linux), libtool does not work correctly if
-GCC was compiled with the ``--disable-shared option``.  To work around this,
-install your own version of GCC that has shared libraries enabled by default.
-
-
-I've updated my source tree from Subversion, and now my build is trying to use a file/directory that doesn't exist.
--------------------------------------------------------------------------------------------------------------------
-You need to re-run configure in your object directory.  When new Makefiles
-are added to the source tree, they have to be copied over to the object tree
-in order to be used by the build.
-
-
-I've modified a Makefile in my source tree, but my build tree keeps using the old version.  What do I do?
----------------------------------------------------------------------------------------------------------
-If the Makefile already exists in your object tree, you can just run the
-following command in the top level directory of your object tree:
-
-.. code-block:: console
-
-   % ./config.status <relative path to Makefile>;
-
-If the Makefile is new, you will have to modify the configure script to copy
-it over.
-
-
-I've upgraded to a new version of LLVM, and I get strange build errors.
------------------------------------------------------------------------
-Sometimes, changes to the LLVM source code alters how the build system works.
-Changes in ``libtool``, ``autoconf``, or header file dependencies are
-especially prone to this sort of problem.
-
-The best thing to try is to remove the old files and re-build.  In most cases,
-this takes care of the problem.  To do this, just type ``make clean`` and then
-``make`` in the directory that fails to build.
-
-
-I've built LLVM and am testing it, but the tests freeze.
---------------------------------------------------------
-This is most likely occurring because you built a profile or release
-(optimized) build of LLVM and have not specified the same information on the
-``gmake`` command line.
-
-For example, if you built LLVM with the command:
-
-.. code-block:: console
-
-   % gmake ENABLE_PROFILING=1
-
-...then you must run the tests with the following commands:
-
-.. code-block:: console
-
-   % cd llvm/test
-   % gmake ENABLE_PROFILING=1
-
-Why do test results differ when I perform different types of builds?
---------------------------------------------------------------------
-The LLVM test suite is dependent upon several features of the LLVM tools and
-libraries.
-
-First, the debugging assertions in code are not enabled in optimized or
-profiling builds.  Hence, tests that used to fail may pass.
-
-Second, some tests may rely upon debugging options or behavior that is only
-available in the debug build.  These tests will fail in an optimized or
-profile build.
-
-
-After Subversion update, rebuilding gives the error "No rule to make target".
------------------------------------------------------------------------------
-If the error is of the form:
-
-.. code-block:: console
-
-   gmake[2]: *** No rule to make target `/path/to/somefile',
-                 needed by `/path/to/another/file.d'.
-   Stop.
-
-This may occur anytime files are moved within the Subversion repository or
-removed entirely.  In this case, the best solution is to erase all ``.d``
-files, which list dependencies for source files, and rebuild:
-
-.. code-block:: console
-
-   % cd $LLVM_OBJ_DIR
-   % rm -f `find . -name \*\.d`
-   % gmake
-
-In other cases, it may be necessary to run ``make clean`` before rebuilding.
-
 
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