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update pch discussion 

llvm-svn: 44884
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Chris Lattner 2007-12-11 22:29:38 +00:00
parent a6b103a3c3
commit 95f80da9fb
1 changed files with 5 additions and 4 deletions
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@ -94,10 +94,11 @@
example, if you write "x-x" in your source code, the GCC AST will
contain "0", with no mention of 'x'. This is extremely bad for a
refactoring tool that wants to rename 'x'.</li>
<li>GCC does not have a way to serialize the AST of a file out to disk and
read it back into another program. Its PCH mechanism is architecturally
only able to read the dump back into the exact same executable as the
one that produced it.</li>
<li>Clang can serialize it's AST out to disk and read it back into another
program, which is useful for whole program analysis. GCC does not have
this, but its current PCH mechanism is close. However, GCC's current
PCH support is architecturally only able to read the dump back into
the exact same executable as the one that produced it.</li>
<li>Clang is <a href="features.html#performance">much faster and uses far
less memory</a> than GCC.</li>
<li>Clang aims to provide extremely clear and concise diagnostics (error and