Re: [fpc-devel] Internal linker bug?
On 25/06/15 15:21, Mark Morgan Lloyd wrote:
patspiper wrote:
Hi,
Linking a pascal project (with {$L mylib.obj}) with a specific .obj
(COFF32) file using the internal linker (Windows) yields an
executable that produces an exception when run. On the other hand,
the external linker produces a sane executable.
The executable is supposed to contain calls from a unit to public
functions in the .obj file, but these calls are to incorrect
locations while the surrounding code is correct, hence the exception.
eg:
External linker (correct): call function1
Internal linker (wrong) : call fpc_widestr_to_ansistr+40
A dump of the .obj file shows that all public functions have an
offset (value) in the symbol table, but no relocation entry, whereas
Static/Nonpublic and external symbols have a relocation entry even if
the symbol table entry offset (value) is 0.
Is this a bug in the internal linker especially that the external
linker does exhibit this behaviour?
Note: I am not too involved in .obj formats, so pls bear with me if
the above is inaccurate.
For the benefit of anybody who's not followed the thread, summary at
http://lists.lazarus.freepascal.org/pipermail/lazarus/2015-June/092881.html
including a link to the conversion tool (originally suggested by José
Mejuto).
The details above are not included in the lazarus mega-thread that you
pointed out, and the latter adds almost nothing to the above info. So
better not daunt fpc devs with such a thread.
Stephano
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[fpc-devel] Internal linker bug?
Hi,
Linking a pascal project (with {$L mylib.obj}) with a specific .obj
(COFF32) file using the internal linker (Windows) yields an executable
that produces an exception when run. On the other hand, the external
linker produces a sane executable.
The executable is supposed to contain calls from a unit to public
functions in the .obj file, but these calls are to incorrect locations
while the surrounding code is correct, hence the exception.
eg:
External linker (correct): call function1
Internal linker (wrong) : call fpc_widestr_to_ansistr+40
A dump of the .obj file shows that all public functions have an offset
(value) in the symbol table, but no relocation entry, whereas
Static/Nonpublic and external symbols have a relocation entry even if
the symbol table entry offset (value) is 0.
Is this a bug in the internal linker especially that the external linker
does exhibit this behaviour?
Note: I am not too involved in .obj formats, so pls bear with me if the
above is inaccurate.
Stephano
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Re: [fpc-devel] Internal linker bug?
patspiper wrote:
Hi,
Linking a pascal project (with {$L mylib.obj}) with a specific .obj
(COFF32) file using the internal linker (Windows) yields an executable
that produces an exception when run. On the other hand, the external
linker produces a sane executable.
The executable is supposed to contain calls from a unit to public
functions in the .obj file, but these calls are to incorrect locations
while the surrounding code is correct, hence the exception.
eg:
External linker (correct): call function1
Internal linker (wrong) : call fpc_widestr_to_ansistr+40
A dump of the .obj file shows that all public functions have an offset
(value) in the symbol table, but no relocation entry, whereas
Static/Nonpublic and external symbols have a relocation entry even if
the symbol table entry offset (value) is 0.
Is this a bug in the internal linker especially that the external linker
does exhibit this behaviour?
Note: I am not too involved in .obj formats, so pls bear with me if the
above is inaccurate.
For the benefit of anybody who's not followed the thread, summary at
http://lists.lazarus.freepascal.org/pipermail/lazarus/2015-June/092881.html
including a link to the conversion tool (originally suggested by José
Mejuto).
--
Mark Morgan Lloyd
markMLl .AT. telemetry.co .DOT. uk
[Opinions above are the author's, not those of his employers or colleagues]
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