New GCC 5.0 Changes, Command-Line Options That Landed So Far
Written by Michael Larabel in Compiler on 26 August 2014 at 11:37 AM EDT. 18 Comments
While we're just a few months into the GCC 4.10 release cycle that's going to be released as GCC 5, there's already some release notes forming for this 2015 open-source compiler update.

The GNU Compiler Collection 5 won't be released until sometime around early-to-mid 2015. In the months since the GCC 4.9 release there's been continued work on Link-Time Optimizations, Intel contributing its MIC runtime offloading library, and continued work towards C++14 support. Much more work is expected in the months ahead and we're still waiting to see GCC's OpenACC 2.0 support with a NVIDIA GPU back-end, support for upcoming Intel and AMD CPUs, more ARM/ARM64 optimizations, and much more.

Anyhow, the tentative GCC 5 release notes were updated this week to reflect some more of the developer-facing changes coming to this next release. You can find the tentative, in-development release notes for GCC 5.0 via the GNU.org documentation. Besides GCC's G++ now supporting C++14 variable templates, GCC for Fortran 2003 supporting the intrinsic IEEE modules, experimental support for Fortran 2008's co-arrays, and new parallel features in Fortran, there's a number of new command-line switches.

In GCC 5 the UndefinedBehaviorSanitizer is getting new sanitization options for floating-point division by zeros, a check to ensure floating-point type to integer conversions don't overflow, instrumentation of array bounds and out-of-bound access detection, and alignment checking for objects. These new sanitization options are exposed via various -fsanitize= values.

GCC 5's C family support also has a number of new command-line options for exposing additional compiler warnings: -Wswitch-bool, -Wlogical-not-parentheses, -Wsizeof-array-argument, and -Wbool-compare. For the C support is also new -Wc90-c99-compat, -Wc99-c11-compat, and -Wno-incompatible-pointer-types options.

Stay tuned for more GCC 5.0 coverage in the months ahead along with fresh compiler benchmarks on Phoronix.
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Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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