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The Linaro Toolchain Working Group (TCWG) is pleased to announce the 2017.05 snapshot of the Linaro GCC 7 source package.

The GCC 7 series introduced an ABI change for ARM targets by fixing a bug (present since GCC 5, see link below) that affects conformance to the procedure call standard (AAPCS). The bug affects some C++ code where class objects are passed by value to functions and could result in incorrect or inconsistent code being generated. If the option -Wpsabi is enabled (on by default) the compiler will emit a diagnostic note for code that might be affected by this ABI change.

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77728

For an explanation of the changes please see the following website:

https://gcc.gnu.org/gcc-7/changes.html

This monthly snapshot1 is based on FSF GCC 7.1+svn247824 and includes performance improvements and bug fixes backported from mainline GCC. The contents of this snapshot will be used for the first stable2 quarterly release in the GCC 7 series.

Interesting changes in this GCC source package snapshot include:f

  • Updates to GCC 7.1+svn247824
  • Backport of [AArch32] Allow combination of aprofile and rmprofile multilibs
  • Backport of [AArch32] Define TM_MULTILIB_CONFIG for ARM multilib
  • Backport of [AArch32] Rename FPSCR builtins to correct names
  • Backport of [AArch32] Set mode for success result of atomic compare and swap
  • Backport of [AArch64] Enable AUTOPREFETCHER_WEAK with -mcpu=generic
  • Backport of [AArch64] Improve address cost for -mcpu=generic
  • Backport of [AArch64] Update alignment for -mcpu=generic
  • Backport of [Testsuite] Require c99_runtime for pr78622.c

Feedback and Support

Subscribe to the important Linaro mailing lists and join our IRC channels to stay on top of Linaro development.

  • Linaro Toolchain Development mailing list
  • Linaro Toolchain IRC channel on irc.freenode.net at #linaro-tcwg

  • Bug reports should be filed in bugzilla against GCC product:http://bugs.linaro.org/enter_bug.cgi?product=GCC
  • Interested in commercial support? inquire at Linaro support

1Source package snapshots are defined when the compiler is only put through unit-testing and full validation is not performed.

2Stable source package releases are defined as releases where the full Linaro Toolchain validation plan is executed.