mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-01-12 17:32:19 +00:00
Validation fixes
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42227 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling
parent
03c993a125
commit
e9a6c35f51
116
docs/FAQ.html
116
docs/FAQ.html
@ -53,7 +53,7 @@
|
||||
<li>After Subversion update, rebuilding gives the error "No rule to make
|
||||
target".</li>
|
||||
<li><a href="#llvmc">The <tt>llvmc</tt> program gives me errors/doesn't
|
||||
work.</li></a>
|
||||
work.</a></li>
|
||||
</ol></li>
|
||||
|
||||
<li><a href="#felangs">Source Languages</a>
|
||||
@ -182,14 +182,12 @@ LLVM have been ported to a plethora of platforms.</p>
|
||||
<p>Some porting problems may exist in the following areas:</p>
|
||||
|
||||
<ul>
|
||||
|
||||
<li>The GCC front end code is not as portable as the LLVM suite, so it may not
|
||||
compile as well on unsupported platforms.</li>
|
||||
compile as well on unsupported platforms.</li>
|
||||
|
||||
<li>The LLVM build system relies heavily on UNIX shell tools, like the Bourne
|
||||
Shell and sed. Porting to systems without these tools (MacOS 9, Plan 9) will
|
||||
require more effort.</li>
|
||||
|
||||
Shell and sed. Porting to systems without these tools (MacOS 9, Plan 9)
|
||||
will require more effort.</li>
|
||||
</ul>
|
||||
|
||||
</div>
|
||||
@ -227,21 +225,23 @@ if it's grabbing the wrong linker/assembler/etc, there are two ways to fix
|
||||
it:</p>
|
||||
|
||||
<ol>
|
||||
|
||||
<li><p>Adjust your <tt>PATH</tt> environment variable so that the correct
|
||||
program appears first in the <tt>PATH</tt>. This may work, but may not be
|
||||
convenient when you want them <i>first</i> in your path for other
|
||||
work.</p></li>
|
||||
program appears first in the <tt>PATH</tt>. This may work, but may not be
|
||||
convenient when you want them <i>first</i> in your path for other
|
||||
work.</p></li>
|
||||
|
||||
<li><p>Run <tt>configure</tt> with an alternative <tt>PATH</tt> that is
|
||||
correct. In a Borne compatible shell, the syntax would be:</p>
|
||||
|
||||
<p><tt>PATH=[the path without the bad program] ./configure ...</tt></p>
|
||||
correct. In a Borne compatible shell, the syntax would be:</p>
|
||||
|
||||
<div class="doc_code">
|
||||
<pre>
|
||||
% PATH=[the path without the bad program] ./configure ...
|
||||
</pre>
|
||||
</div>
|
||||
|
||||
<p>This is still somewhat inconvenient, but it allows <tt>configure</tt>
|
||||
to do its work without having to adjust your <tt>PATH</tt>
|
||||
permanently.</p></li>
|
||||
|
||||
to do its work without having to adjust your <tt>PATH</tt>
|
||||
permanently.</p></li>
|
||||
</ol>
|
||||
|
||||
</div>
|
||||
@ -257,8 +257,8 @@ your own version of GCC that has shared libraries enabled by default.</p>
|
||||
</div>
|
||||
|
||||
<div class="question">
|
||||
<p>I've updated my source tree from Subversion, and now my build is trying to
|
||||
use a file/directory that doesn't exist.</p>
|
||||
<p>I've updated my source tree from Subversion, and now my build is trying to
|
||||
use a file/directory that doesn't exist.</p>
|
||||
</div>
|
||||
|
||||
<div class="answer">
|
||||
@ -273,12 +273,13 @@ old version. What do I do?</p>
|
||||
</div>
|
||||
|
||||
<div class="answer">
|
||||
|
||||
<p>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:</p>
|
||||
|
||||
<p><tt>./config.status <relative path to Makefile></tt><p>
|
||||
<div class="doc_code">
|
||||
<pre>% ./config.status <relative path to Makefile></pre>
|
||||
</div>
|
||||
|
||||
<p>If the Makefile is new, you will have to modify the configure script to copy
|
||||
it over.</p>
|
||||
@ -314,9 +315,7 @@ clean</tt> and then <tt>make</tt> in the directory that fails to build.</p>
|
||||
<p>For example, if you built LLVM with the command:</p>
|
||||
|
||||
<div class="doc_code">
|
||||
<pre>
|
||||
% gmake ENABLE_PROFILING=1
|
||||
</pre>
|
||||
<pre>% gmake ENABLE_PROFILING=1</pre>
|
||||
</div>
|
||||
|
||||
<p>...then you must run the tests with the following commands:</p>
|
||||
@ -354,12 +353,12 @@ build.</p>
|
||||
|
||||
<div class="answer">
|
||||
<p>This is <a href="http://gcc.gnu.org/PR?13392">a bug in GCC</a>, and
|
||||
affects projects other than LLVM. Try upgrading or downgrading your GCC.</p>
|
||||
affects projects other than LLVM. Try upgrading or downgrading your GCC.</p>
|
||||
</div>
|
||||
|
||||
<div class="question">
|
||||
<p>After Subversion update, rebuilding gives the error
|
||||
"No rule to make target".</p>
|
||||
<p>After Subversion update, rebuilding gives the error "No rule to make
|
||||
target".</p>
|
||||
</div>
|
||||
|
||||
<div class="answer">
|
||||
@ -389,14 +388,13 @@ removed entirely. In this case, the best solution is to erase all
|
||||
rebuilding.</p>
|
||||
</div>
|
||||
|
||||
<div class="question">
|
||||
<a name="llvmc"<p>The <tt>llvmc</tt> program gives me errors/doesn't
|
||||
work.</p></a>
|
||||
<div class="question"><p><a name="llvmc">
|
||||
The <tt>llvmc</tt> program gives me errors/doesn't work.</a></p>
|
||||
</div>
|
||||
|
||||
<div class="answer">
|
||||
<p><tt>llvmc</tt> is experimental and isn't really supported. We suggest
|
||||
using <tt>llvm-gcc</tt> instead.</p>
|
||||
<p><tt>llvmc</tt> is experimental and isn't really supported. We suggest
|
||||
using <tt>llvm-gcc</tt> instead.</p>
|
||||
</div>
|
||||
|
||||
<!-- *********************************************************************** -->
|
||||
@ -417,8 +415,8 @@ rebuilding.</p>
|
||||
<p>The PyPy developers are working on integrating LLVM into the PyPy backend
|
||||
so that PyPy language can translate to LLVM.</p>
|
||||
</div>
|
||||
<div class="question"><a name="langhlsupp">
|
||||
<p>What support is there for a higher level source language constructs for
|
||||
<div class="question"><p><a name="langhlsupp">
|
||||
What support is there for a higher level source language constructs for
|
||||
building a compiler?</a></p>
|
||||
</div>
|
||||
<div class="answer">
|
||||
@ -431,13 +429,12 @@ rebuilding.</p>
|
||||
of running optimizations, linking, and executable generation.</p>
|
||||
</div>
|
||||
|
||||
<div class="question"><a name="langhlsupp">
|
||||
<p>I don't understand the GetElementPtr
|
||||
instruction. Help!</a></p>
|
||||
<div class="question"><p><a name="langhlsupp">
|
||||
I don't understand the GetElementPtr instruction. Help!</a></p>
|
||||
</div>
|
||||
<div class="answer">
|
||||
<p>See <a href="GetElementPtr.html">The Often Misunderstood GEP
|
||||
Instruction</a>.</li>
|
||||
Instruction</a>.</p>
|
||||
</div>
|
||||
|
||||
<!-- *********************************************************************** -->
|
||||
@ -533,7 +530,7 @@ C++ support for a processor that does not otherwise have a C++ compiler.
|
||||
<p>Use commands like this:</p>
|
||||
|
||||
<ol>
|
||||
<li><p>Compile your program as normal with llvm-g++:</p></li>
|
||||
<li><p>Compile your program as normal with llvm-g++:</p>
|
||||
|
||||
<div class="doc_code">
|
||||
<pre>
|
||||
@ -541,7 +538,7 @@ C++ support for a processor that does not otherwise have a C++ compiler.
|
||||
</pre>
|
||||
</div>
|
||||
|
||||
<p>or:</p>
|
||||
<p>or:</p>
|
||||
|
||||
<div class="doc_code">
|
||||
<pre>
|
||||
@ -551,47 +548,44 @@ C++ support for a processor that does not otherwise have a C++ compiler.
|
||||
</pre>
|
||||
</div>
|
||||
|
||||
<p>With llvm-gcc3, this will generate program and program.bc. The .bc file is
|
||||
the LLVM version of the program all linked together.</p>
|
||||
<p>With llvm-gcc3, this will generate program and program.bc. The .bc
|
||||
file is the LLVM version of the program all linked together.</p></li>
|
||||
|
||||
<li><p>Convert the LLVM code to C code, using the LLC tool with the C
|
||||
backend:</p></li>
|
||||
<li><p>Convert the LLVM code to C code, using the LLC tool with the C
|
||||
backend:</p>
|
||||
|
||||
<div class="doc_code">
|
||||
<pre>
|
||||
% llc -march=c program.bc -o program.c
|
||||
</pre>
|
||||
</div>
|
||||
</div></li>
|
||||
|
||||
<li><p>Finally, compile the c file:</p></li>
|
||||
<li><p>Finally, compile the C file:</p>
|
||||
|
||||
<div class="doc_code">
|
||||
<pre>
|
||||
% cc x.c
|
||||
</pre>
|
||||
</div>
|
||||
</div></li>
|
||||
|
||||
</ol>
|
||||
|
||||
<p>Note that, by default, the C backend does not support exception handling.
|
||||
If you want/need it for a certain program, you can enable it by passing
|
||||
"-enable-correct-eh-support" to the llc program. The resultant code will
|
||||
use setjmp/longjmp to implement exception support that is correct but
|
||||
relatively slow.
|
||||
</p>
|
||||
<p>Note that, by default, the C backend does not support exception handling. If
|
||||
you want/need it for a certain program, you can enable it by passing
|
||||
"-enable-correct-eh-support" to the llc program. The resultant code will use
|
||||
setjmp/longjmp to implement exception support that is correct but relatively
|
||||
slow.</p>
|
||||
|
||||
<p>Also note: this specific sequence of commands won't work if you use a
|
||||
function defined in the C++ runtime library (or any other C++ library). To
|
||||
access an external C++ library, you must manually
|
||||
compile libstdc++ to LLVM bitcode, statically link it into your program, then
|
||||
use the commands above to convert the whole result into C code. Alternatively,
|
||||
you can compile the libraries and your application into two different chunks
|
||||
of C code and link them.</p>
|
||||
<p>Also note: this specific sequence of commands won't work if you use a
|
||||
function defined in the C++ runtime library (or any other C++ library). To
|
||||
access an external C++ library, you must manually compile libstdc++ to LLVM
|
||||
bitcode, statically link it into your program, then use the commands above to
|
||||
convert the whole result into C code. Alternatively, you can compile the
|
||||
libraries and your application into two different chunks of C code and link
|
||||
them.</p>
|
||||
|
||||
</div>
|
||||
|
||||
|
||||
|
||||
<!-- *********************************************************************** -->
|
||||
<div class="doc_section">
|
||||
<a name="cfe_code">Questions about code generated by the GCC front-end</a>
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user