Bug#756260: ghc generates lots of unaligned access syslog warnings on hppa

John David Anglin dave.anglin at bell.net
Sun Jul 26 16:25:04 UTC 2015

This is caused by the following issue:

Like ia64, hppa has function descriptors.  A function pointer has the plabel bit (bit 30)
set in the function pointer.  A function pointer pointing to an integer data object is off by + 2,
causing the unaligned warnings.

I found this debugging debugging the test failure in the haskell-text-icu package.  Eventually,
I found that the address used for sm_mutex was off by two.

Misaligned mutex addresses break the thread support.  This caused various random failures
building many haskell packages.

Attached is a back port the ghc-7.10 patch.  Please apply in next 7.8 ghc update.

John David Anglin	dave.anglin at bell.net

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