For PR1152:

Update documentation to reflect that this isn't a full-blown executable
any more.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33807 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/docs/CommandGuide/gccas.pod b/docs/CommandGuide/gccas.pod
index 779d468ce3d0467dc404ce0d384cc07448802848..56a1749df74323bacc859eb1b9250cf604358ae6 100644 (file)
--- a/docs/CommandGuide/gccas.pod
+++ b/docs/CommandGuide/gccas.pod
@@ -2,7 +2,7 @@
 
 =head1 NAME
 
-gccas - optimizing LLVM assembler
+gccas - convenience script to run B<llvm-as> and B<opt>
 
 =head1 SYNOPSIS
 
@@ -10,19 +10,19 @@ B<gccas> [I<options>] I<filename>
 
 =head1 DESCRIPTION
 
-The B<gccas> utility takes an LLVM assembly file generated by the
-L<llvmgcc|llvmgcc> or L<llvmg++|llvmgxx> front-ends and converts
-it into an LLVM bytecode file.  It is primarily used by the GCC
-front end, and as such, attempts to mimic the interface provided
-by the default system assembler so that it can act as a "drop-in"
-replacement.
+The B<gccas> shell script passes an LLVM assembly file through the B<llvm-as> 
+and B<opt> programs to generate an optimized bytecode file. Its name is an
+historical artifact from when it was a full executable used to process LLVM 
+assembly generated by the L<llvmgcc|llvmgcc> or L<llvmg++|llvmgxx> front-ends.  
+Currently this is a shell script that simulates what the old B<gccas> executable
+once did. 
 
-B<gccas> performs a number of optimizations on the input program,
-including but not limited to: promotion of stack values to SSA
-registers; elimination of dead globals, function arguments, code,
-and types; tail-call elimination; loop-invariant code motion; global
-common-subexpression elimination; and sparse conditional constant
-propagation.
+B<gccas> performs a number of optimizations on the input program, including but
+not limited to: promotion of stack values to SSA registers; elimination of dead
+globals, function arguments, code, and types; tail-call elimination; 
+loop-invariant code motion; global common-subexpression elimination; and 
+sparse conditional constant propagation. It accomplishes this by using the
+B<-std-compile-opts> option to the B<opt> tool.
 
 =head1 OPTIONS
 
@@ -71,7 +71,7 @@ status.
 
 =head1 SEE ALSO
 
-L<llvm-as|llvm-as>, L<gccld|gccld>
+L<llvm-as|llvm-as>, L<opt|opt>, L<gccld|gccld>
 
 =head1 AUTHORS