The next release of the GNU Compiler Collection , GCC 7 , is fast approaching, so in this post, I'm going to talk about work I've done to make GCC more reliable GCC has a large test suite: when I test a patch, roughly 330,000 tests are run, covering various aspects of the compiler, such as: handling valid and invalid syntax in the front-ends verifying that optimizations passes are run verifying that the resulting code runs correctly verifying that the...
I work at Red Hat on GCC, the GNU Compiler Collection . The next major release of GCC, GCC 6 , is just around the corner, so I thought I'd post about a new compiler warning I've contributed to it: -Wmisleading-indentation . One of the more common "gotchas" in C and C++ programming relates to missing braces. For example, in the following: if (some_condition ()) do_foo (); do_bar (); the "do_bar ();" looks like it's guarded by the conditional, but...
In an earlier post , I talked about GCC (the GNU Compiler Collection) , and work that I did to make the internals of GCC more robust for GCC 5 . This post is about something more user-visible: as of GCC 5, GCC's code-generation backend can now be built as a shared library. When might you want to generate machine code? The primary reason is for speed: anything that parses an input format and repeatedly acts on it, such as...
If you've done any C or C++ development on Fedora or Red Hat Enterprise Linux (RHEL), you'll have used GCC, the GNU Compiler Collection . Red Hat has long been a leading contributor to GCC, and this continues as we work with others in the "upstream" GCC community on the next major release: GCC 5. In this post I'll talk about some of the deep architectural changes I've been making to GCC. You won't directly see these changes unless you...
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