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toolchain: introduce BR2_TOOLCHAIN_HAS_GCC_BUG_63261

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dmalloc and fxload fail to build for the Microblaze architecture with
optimization enabled with gcc < 8.x, with the following failure:

  Error: PC relative branch to label logerror which is not in the instruction space
  Error: operation combines symbols in different segments

The following defconfig allows to reproduce the issue:

BR2_microblazeel=y
BR2_OPTIMIZE_2=y
BR2_KERNEL_HEADERS_5_0=y
BR2_GCC_VERSION_7_X=y
BR2_PACKAGE_FXLOAD=y

The gcc bug was reported at
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63261 and is fixed as of
gcc 8.x.

Signed-off-by: Giulio Benetti <giulio.benetti@micronovasrl.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
This commit is contained in:
Giulio Benetti 2019-06-14 23:03:37 +02:00 committed by Thomas Petazzoni
parent 4e5b439758
commit 4adc06b4f8
1 changed files with 7 additions and 0 deletions
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7
toolchain/Config.in
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@ -113,6 +113,13 @@ config BR2_TOOLCHAIN_SUPPORTS_VARIADIC_MI_THUNK
depends on !BR2_or1k
depends on !BR2_xtensa
# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63261. This bug no
# longer exists in gcc 8.x.
config BR2_TOOLCHAIN_HAS_GCC_BUG_63261
bool
default y if BR2_microblaze
depends on !BR2_TOOLCHAIN_GCC_AT_LEAST_8
# Prior to gcc 7.x, exception_ptr, nested_exception and future from
# libstdc++ would only be provided on architectures that support
# always lock-free atomic ints. See