Clarify how to configure llvm-gcc-4.2 for use with

test suite. Remove documentation for --with-f2c, which
is no longer supported. Remove information about obtaining
tcl/expect, which ship with Mac OS X by default since
10.4.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74271 91177308-0d34-0410-b5e6-96231b3b80d8

docs/TestingGuide.html

@@ -78,27 +78,8 @@
 <dd>Expect is required by DejaGNU.</dd>
 <dt><a href="http://www.tcl.tk/software/tcltk/">tcl</a></dt>
 <dd>Tcl is required by DejaGNU. </dd>
-
-<ul>
-<li><tt>./configure --with-f2c=$DIR</tt><br>
-This will specify a new <tt>$DIR</tt> for the above-described search
-process.  This will only work if the binary, header, and library are in their
-respective subdirectories of <tt>$DIR</tt>.</li>
-
-<li><tt>./configure --with-f2c-bin=/binary/path --with-f2c-inc=/include/path
---with-f2c-lib=/lib/path</tt><br>
-This allows you to specify the F2C components separately.  Note: if you choose
-this route, you MUST specify all three components, and you need to only specify
-<em>directories</em> where the files are located; do NOT include the
-filenames themselves on the <tt>configure</tt> line.</li>
-</ul></dd>
 </dl>
 
-<p>Darwin (Mac OS X) developers can simplify the installation of Expect and tcl
-by using fink.  <tt>fink install expect</tt> will install both. Alternatively,
-Darwinports users can use <tt>sudo port install expect</tt> to install Expect
-and tcl.</p>
-
 </div>
 
 <!--=========================================================================-->
@@ -122,14 +103,17 @@
 
 <div class="doc_text">
 
-<p>Code fragments are small pieces of code that test a specific feature of LLVM
-or trigger a specific bug in LLVM.  They are usually written in LLVM assembly
-language, but can be written in other languages if the test targets a particular
-language front end. These tests are driven by the DejaGNU testing framework,
-which is hidden behind a few simple makefiles.</p>
+<p>Code fragments are small pieces of code that test a specific
+feature of LLVM or trigger a specific bug in LLVM.  They are usually
+written in LLVM assembly language, but can be written in other
+languages if the test targets a particular language front end (and the
+appropriate <tt>--with-llvmgcc</tt> options were used
+at <tt>configure</tt> time of the <tt>llvm</tt> module). These tests
+are driven by the DejaGNU testing framework, which is hidden behind a
+few simple makefiles.</p>
 
-<p>These code fragments are not complete programs. The code generated from them is
-never executed to determine correct behavior.</p> 
+<p>These code fragments are not complete programs. The code generated
+from them is never executed to determine correct behavior.</p>
 
 <p>These code fragment tests are located in the <tt>llvm/test</tt>
 directory.</p>
@@ -251,10 +235,18 @@
 % cd ..
 % ./configure --with-llvmgccdir=$LLVM_GCC_DIR
 </pre>
-<p>where <tt>$LLVM_GCC_DIR</tt> is the directory where you <em>installed</em>
-llvm-gcc, not it's src or obj dir.</p>
 </div>
 
+<p>where <tt>$LLVM_GCC_DIR</tt> is the directory where
+you <em>installed</em> llvm-gcc, not it's src or obj
+dir. The <tt>--with-llvmgccdir</tt> option assumes that
+the <tt>llvm-gcc-4.2</tt> module was configured with
+<tt>--program-prefix=llvm-</tt>, and therefore that the C and C++
+compiler drivers are called <tt>llvm-gcc</tt> and <tt>llvm-g++</tt>
+respectively.  If this is not the case,
+use <tt>--with-llvmgcc</tt>/<tt>--with-llvmgxx</tt> to specify each
+executable's location.</p>
+
 <p>Then, run the entire test suite by running make in the <tt>test-suite</tt>
 directory:</p>
 
@@ -448,6 +440,11 @@
 </pre>
 </div>
 
+<p>If your system includes GNU <tt>grep</tt>, make sure
+that <tt>GREP_OPTIONS</tt> is not set in your environment. Otherwise,
+you may get invalid results (both false positives and false
+negatives).</p>
+
 </div>
 
 <!-- _______________________________________________________________________ -->
@@ -746,6 +743,8 @@
 have the suite checked out and configured, you don't need to do it again (unless
 the test code or configure script changes).</p>
 
+</div>
+
 <!-- _______________________________________________________________________ -->
 <div class="doc_subsection">
 <a name="testsuiteexternal">Configuring External Tests</a></div>

test/Makefile

@@ -22,6 +22,10 @@ include Makefile.tests
 # DejaGNU testing support
 #===------------------------------------------------------------------------===#
 
+ifneq ($(GREP_OPTIONS),)
+$(warning GREP_OPTIONS environment variable may interfere with test results)
+endif
+
 ifdef VERBOSE
 RUNTESTFLAGS := $(VERBOSE)
 endif