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cleanups and updates to the GSG, patch by B Scott Michel, thanks!
This is PR899 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30143 91177308-0d34-0410-b5e6-96231b3b80d8
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Chris Lattner
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@ -52,6 +52,10 @@
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</ol></li>
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<li><a href="#tutorial">An Example Using the LLVM Tool Chain</a>
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<ol>
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<li><a href="#tutorial4">Example with llvm-gcc4</a></li>
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<li><a href="#tutorial3">Example with llvm-gcc3</a></li>
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</ol>
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<li><a href="#problems">Common Problems</a>
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<li><a href="#links">Links</a>
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</ul>
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@ -206,7 +210,7 @@ software you will need.</p>
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<p>LLVM is known to work on the following platforms:</p>
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<table cellpadding="3">
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<table cellpadding="3" summary="Known LLVM platforms">
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<tr>
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<th>OS</th>
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<th>Arch</th>
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@ -257,7 +261,7 @@ software you will need.</p>
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<p>LLVM has partial support for the following platforms:</p>
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<table>
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<table summary="LLVM partial platform support">
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<tr>
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<th>OS</th>
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<th>Arch</th>
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@ -347,7 +351,7 @@ href="CFEBuildInstrs.html">try to compile it</a> on your platform.</p>
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is the usual name for the software package that LLVM depends on. The Version
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column provides "known to work" versions of the package. The Notes column
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describes how LLVM uses the package and provides other details.</p>
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<table>
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<table summary="Packages required to compile LLVM">
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<tr><th>Package</th><th>Version</th><th>Notes</th></tr>
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<tr>
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@ -439,7 +443,7 @@ href="CFEBuildInstrs.html">try to compile it</a> on your platform.</p>
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<p><b>Notes:</b></p>
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<div class="doc_notes">
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<ol>
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<li><a name="sf3">Only the C and C++ languages are needed so there's no
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<li><a name="sf1">Only the C and C++ languages are needed so there's no
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need to build the other languages for LLVM's purposes.</a> See
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<a href="#brokengcc">below</a> for specific version info.</li>
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<li><a name="sf2">You only need CVS if you intend to build from the
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@ -566,14 +570,14 @@ All these paths are absolute:</p>
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<dt>SRC_ROOT
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<dd>
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This is the top level directory of the LLVM source tree.
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<p>
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<br><br>
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<dt>OBJ_ROOT
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<dd>
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This is the top level directory of the LLVM object tree (i.e. the
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tree where object files and compiled programs will be placed. It
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can be the same as SRC_ROOT).
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<p>
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<br><br>
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<dt>LLVMGCCDIR
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<dd>
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@ -765,7 +769,7 @@ the Makefiles needed to begin building LLVM.</p>
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<p>The following environment variables are used by the <tt>configure</tt>
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script to configure the build system:</p>
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<table>
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<table summary="LLVM configure script environment variables">
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<tr><th>Variable</th><th>Purpose</th></tr>
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<tr>
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<td>CC</td>
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@ -807,14 +811,14 @@ script to configure the build system:</p>
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dejagnu based test suite in <tt>llvm/test</tt>. If you don't specify this
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option, the LLVM configure script will search for the tcl 8.4 and 8.3
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releases.
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<p></p>
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<br><br>
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</dd>
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<dt><i>--enable-optimized</i></dt>
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<dd>
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Enables optimized compilation by default (debugging symbols are removed
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and GCC optimization flags are enabled). The default is to use an
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unoptimized build (also known as a debug build).
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<p></p>
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<br><br>
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</dd>
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<dt><i>--enable-debug-runtime</i></dt>
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<dd>
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@ -827,7 +831,7 @@ script to configure the build system:</p>
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available
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on all platforms. The default is dependent on platform, so it is best
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to explicitly enable it if you want it.
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<p></p>
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<br><br>
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</dd>
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<dt><i>--enable-targets=</i><tt>target-option</tt></dt>
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<dd>Controls which targets will be built and linked into llc. The default
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@ -838,7 +842,7 @@ script to configure the build system:</p>
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separated list of target names that you want available in llc. The target
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names use all lower case. The current set of targets is: <br/>
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<tt>alpha, ia64, powerpc, skeleton, sparc, x86</tt>.
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<p></p></dd>
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<br><br></dd>
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<dt><i>--enable-doxygen</i></dt>
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<dd>Look for the doxygen program and enable construction of doxygen based
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documentation from the source code. This is disabled by default because
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@ -852,12 +856,12 @@ script to configure the build system:</p>
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<li>Change directory into the object root directory:
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<br>
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<tt>cd <i>OBJ_ROOT</i></tt>
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<p>
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<br><br>
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<li>Run the <tt>configure</tt> script located in the LLVM source tree:
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<br>
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<tt><i>SRC_ROOT</i>/configure --prefix=/install/path [other options]</tt>
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<p>
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<br><br>
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</ol>
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</div>
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@ -879,7 +883,7 @@ builds:</p>
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<tt>--enable-optimized</tt> option was used during configuration). The
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build system will compile the tools and libraries with debugging
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information.
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<p>
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<br><br>
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<dt>Release (Optimized) Builds
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<dd>
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@ -888,7 +892,7 @@ builds:</p>
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<tt>gmake</tt> command line. For these builds, the build system will
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compile the tools and libraries with GCC optimizations enabled and strip
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debugging information from the libraries and executables it generates.
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<p>
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<br><br>
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<dt>Profile Builds
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<dd>
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@ -921,14 +925,14 @@ source code:</p>
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<dd>
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Removes all files generated by the build. This includes object files,
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generated C/C++ files, libraries, and executables.
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<p>
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<br><br>
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<dt><tt>gmake dist-clean</tt>
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<dd>
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Removes everything that <tt>gmake clean</tt> does, but also removes files
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generated by <tt>configure</tt>. It attempts to return the source tree to the
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original state in which it was shipped.
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<p>
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<br><br>
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<dt><tt>gmake install</tt>
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<dd>
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@ -936,15 +940,15 @@ source code:</p>
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hierarchy
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under $PREFIX, specified with <tt>./configure --prefix=[dir]</tt>, which
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defaults to <tt>/usr/local</tt>.
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<p>
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<br><br>
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<dt><tt>gmake -C runtime install-bytecode</tt>
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<dd>
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Assuming you built LLVM into $OBJDIR, when this command is run, it will
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install bytecode libraries into the GCC front end's bytecode library
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directory. If you need to update your bytecode libraries,
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this is the target to use once you've built them.
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<p>
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<br><br>
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</dl>
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<p>Please see the <a href="MakefileGuide.html">Makefile Guide</a> for further
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@ -958,27 +962,27 @@ declaring variables on the command line. The following are some examples:</p>
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<dt><tt>gmake ENABLE_OPTIMIZED=1</tt>
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<dd>
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Perform a Release (Optimized) build.
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<p>
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<br><br>
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<dt><tt>gmake ENABLE_OPTIMIZED=1 DISABLE_ASSERTIONS=1</tt>
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<dd>
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Perform a Release (Optimized) build without assertions enabled.
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<p>
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<br><br>
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<dt><tt>gmake ENABLE_PROFILING=1</tt>
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<dd>
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Perform a Profiling build.
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<p>
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<br><br>
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<dt><tt>gmake VERBOSE=1</tt>
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<dd>
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Print what <tt>gmake</tt> is doing on standard output.
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<p>
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<br><br>
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<dt><tt>gmake TOOL_VERBOSE=1</tt></dt>
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<dd>Ask each tool invoked by the makefiles to print out what it is doing on
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the standard output. This also implies <tt>VERBOSE=1</tt>.
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<p></dd>
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<br><br></dd>
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</dl>
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<p>Every directory in the LLVM object tree includes a <tt>Makefile</tt> to build
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@ -1069,7 +1073,7 @@ named after the build type:</p>
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<dt>Libraries
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<dd><tt><i>OBJ_ROOT</i>/Debug/lib</tt>
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</dl>
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<p>
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<br><br>
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<dt>Release Builds
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<dd>
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@ -1079,7 +1083,7 @@ named after the build type:</p>
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<dt>Libraries
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<dd><tt><i>OBJ_ROOT</i>/Release/lib</tt>
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</dl>
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<p>
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<br><br>
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<dt>Profile Builds
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<dd>
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@ -1413,7 +1417,7 @@ are code generators for parts of LLVM infrastructure.</p>
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that finds differences between code that LLC generates and code that LLI
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generates. This is a useful tool if you are debugging one of them,
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assuming that the other generates correct output. For the full user
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manual, run <tt>`perldoc codegen-diff'</tt>.<p>
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manual, run <tt>`perldoc codegen-diff'</tt>.<br><br>
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<dt><tt><b>cvsupdate</b></tt> <dd><tt>cvsupdate</tt> is a script that will
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update your CVS tree, but produce a much cleaner and more organized output
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@ -1421,21 +1425,21 @@ are code generators for parts of LLVM infrastructure.</p>
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together all the new and updated files and modified files in separate
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sections, so you can see at a glance what has changed. If you are at the
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top of your LLVM CVS tree, running <tt>utils/cvsupdate</tt> is the
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preferred way of updating the tree.<p>
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preferred way of updating the tree.<br><br>
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<dt><tt><b>emacs/</b></tt> <dd>The <tt>emacs</tt> directory contains
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syntax-highlighting files which will work with Emacs and XEmacs editors,
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providing syntax highlighting support for LLVM assembly files and TableGen
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description files. For information on how to use the syntax files, consult
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the <tt>README</tt> file in that directory.<p>
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the <tt>README</tt> file in that directory.<br><br>
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<dt><tt><b>getsrcs.sh</b></tt> <dd>The <tt>getsrcs.sh</tt> script finds
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and outputs all non-generated source files, which is useful if one wishes
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to do a lot of development across directories and does not want to
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individually find each file. One way to use it is to run, for example:
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<tt>xemacs `utils/getsources.sh`</tt> from the top of your LLVM source
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tree.<p>
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tree.<br><br>
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<dt><tt><b>llvmgrep</b></tt></dt>
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<dd>This little tool performs an "egrep -H -n" on each source file in LLVM and
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passes to it a regular expression provided on <tt>llvmgrep</tt>'s command
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@ -1448,24 +1452,24 @@ are code generators for parts of LLVM infrastructure.</p>
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<tt>llvm/lib/Target/Sparc</tt>, if <tt>makellvm</tt> is in your path,
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simply running <tt>makellvm llc</tt> will make a build of the current
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directory, switch to directory <tt>llvm/tools/llc</tt> and build it,
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causing a re-linking of LLC.<p>
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causing a re-linking of LLC.<br><br>
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<dt><tt><b>NightlyTest.pl</b></tt> and
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<tt><b>NightlyTestTemplate.html</b></tt> <dd>These files are used in a
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cron script to generate nightly status reports of the functionality of
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tools, and the results can be seen by following the appropriate link on
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the <a href="http://llvm.org/">LLVM homepage</a>.<p>
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the <a href="http://llvm.org/">LLVM homepage</a>.<br><br>
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<dt><tt><b>TableGen/</b></tt> <dd>The <tt>TableGen</tt> directory contains
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the tool used to generate register descriptions, instruction set
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descriptions, and even assemblers from common TableGen description
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files.<p>
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files.<br><br>
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<dt><tt><b>vim/</b></tt> <dd>The <tt>vim</tt> directory contains
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syntax-highlighting files which will work with the VIM editor, providing
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syntax highlighting support for LLVM assembly files and TableGen
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description files. For information on how to use the syntax files, consult
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the <tt>README</tt> file in that directory.<p>
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the <tt>README</tt> file in that directory.<br><br>
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</dl>
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@ -1490,10 +1494,17 @@ are code generators for parts of LLVM infrastructure.</p>
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<p>This section gives an example of using LLVM. Since we are currently
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transitioning from llvm-gcc3 to llvm-gcc4, we include examples for both.
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</p>
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<p><b>Note:</b> The <i>gcc4</i> frontend's invocation is <b><i>considerably different</i></b>
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from the previous <i>gcc3</i> frontend. In particular, the <i>gcc4</i> frontend <b><i>does not</i></b>
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create bytecode by default: <i>gcc4</i> produces native code. As the example below illustrates,
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the '--emit-llvm' flag is needed to produce LLVM bytecode output. For <i>makefiles</i> and
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<i>configure</i> scripts, the CFLAGS variable needs '--emit-llvm' to produce bytecode
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output.</p>
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</div>
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<!-- ======================================================================= -->
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<div class="doc_subsection"><a name="tutorial3">Example with llvm-gcc4</a></div>
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<div class="doc_subsection"><a name="tutorial4">Example with llvm-gcc4</a></div>
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<div class="doc_text">
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@ -1540,7 +1551,7 @@ transitioning from llvm-gcc3 to llvm-gcc4, we include examples for both.
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<li><p>Use the <tt>llvm-dis</tt> utility to take a look at the LLVM assembly
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code:</p>
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<p><tt>% llvm-dis < hello.bc | less</tt><p></li>
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<p><tt>% llvm-dis < hello.bc | less</tt><br><br></li>
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<li><p>Compile the program to native assembly using the LLC code
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generator:</p>
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@ -1595,9 +1606,9 @@ transitioning from llvm-gcc3 to llvm-gcc4, we include examples for both.
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<li><p>Run the program. To make sure the program ran, execute one of the
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following commands:</p>
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<p><tt>% ./hello</tt></p>
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<p>or</p>
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<p><tt>% lli hello.bc</tt></p></li>
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@ -1605,7 +1616,7 @@ transitioning from llvm-gcc3 to llvm-gcc4, we include examples for both.
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<li><p>Use the <tt>llvm-dis</tt> utility to take a look at the LLVM assembly
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code:</p>
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<p><tt>% llvm-dis < hello.bc | less</tt><p></li>
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<p><tt>% llvm-dis < hello.bc | less</tt><br><br></li>
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<li><p>Compile the program to native assembly using the LLC code
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generator:</p>
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Block a user