[fpc-devel] Odd test failure on x86_64-win64

[J. Gareth Moreton via fpc-devel]

Hi everyone,

So I stumbled across this during my optimisation development:

Under x86_64-win64 (I'm not sure about other platforms), the test
"test/tarray15.pp" fails with exitcode 19 if you run the test suite with
TEST_OPT=-a to create assembly dumps.  The failure is because the code
attempts to write to a constant but doesn't raise an exception while
doing so.  Can anyone else confirm this?

Gareth aka. Kit

[Pierre Muller via fpc-devel]

Please look at:


https://www.freepascal.org/testsuite/cgi-bin/new-testsuite2.cgi?action=4&testfileid=5630

.rdata support, i.e. read-only data sections,
is not supported in several CPU-OS combination,
and IIRC, it is even worse for PIC code,
but I don't really know if these special limitations
should not be removed...

See TGNUAssembler.sectionname method in compiler/aggas.pas unit,
and difference between secnames and secnames_pic inside that method.

Pierre

Post by J. Gareth Moreton via fpc-devel
Hi everyone,
Under x86_64-win64 (I'm not sure about other platforms), the test
"test/tarray15.pp" fails with exitcode 19 if you run the test suite with
TEST_OPT=-a to create assembly dumps.  The failure is because the code
attempts to write to a constant but doesn't raise an exception while
doing so.  Can anyone else confirm this?
Gareth aka. Kit

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[J. Gareth Moreton via fpc-devel]

It just seemed odd to me that switching to the external assembler (due
to -a) causes the section to be read/write, while the internal assembler
can handle it.  That might be a limitation with the external assembler
though.

Gareth aka. Kit

Post by Pierre Muller via fpc-devel
https://www.freepascal.org/testsuite/cgi-bin/new-testsuite2.cgi?action=4&testfileid=5630
.rdata support, i.e. read-only data sections,
is not supported in several CPU-OS combination,
and  IIRC, it is even worse for PIC code,
but I don't really know if these special limitations
should not be removed...
See TGNUAssembler.sectionname method in compiler/aggas.pas unit,
and difference between secnames and secnames_pic inside that method.
Pierre

Post by J. Gareth Moreton via fpc-devel
Hi everyone,
Under x86_64-win64 (I'm not sure about other platforms), the test
"test/tarray15.pp" fails with exitcode 19 if you run the test suite with
TEST_OPT=-a to create assembly dumps.  The failure is because the code
attempts to write to a constant but doesn't raise an exception while
doing so.  Can anyone else confirm this?
Gareth aka. Kit

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