digitalmars.D.bugs - [Issue 5739] New: versioned linkage declarations don't work
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http://d.puremagic.com/issues/show_bug.cgi?id=5739
Summary: versioned linkage declarations don't work
Product: D
Version: D1 & D2
Platform: All
OS/Version: All
Status: NEW
Keywords: accepts-invalid, rejects-valid, wrong-code
Severity: normal
Priority: P2
Component: DMD
AssignedTo: nobody puremagic.com
ReportedBy: mrmocool gmx.de
--- Comment #0 from Trass3r <mrmocool gmx.de> 2011-03-15 04:51:51 PDT ---
main.d:
=======
import versionextern;
void main()
{
foo();
}
versionextern.d:
================
version = Bla;
version(Bla)
{
extern(Windows):
}
else version(Blub)
{
extern(C):
}
void foo();
yields:
Symbol Undefined _D13versionextern3fooFZv
no matter what version is defined.
removing the parentheses and else:
version(Bla)
extern(Windows):
version(Blub)
extern(C):
even results in:
main(5): Error: undefined identifier foo
I'm not sure if this is a rejects-valid or accepts-invalid issue.
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http://d.puremagic.com/issues/show_bug.cgi?id=5739
Jacob Carlborg <doob me.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |doob me.com
--- Comment #1 from Jacob Carlborg <doob me.com> 2011-03-15 05:47:14 PDT ---
In this particular case you could use "extern (System)". But this should
probably be fixed anyway.
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--- Comment #2 from Trass3r <mrmocool gmx.de> 2011-03-15 10:06:21 PDT ---
Yep I know, but the original code is like:
version(CL_VERSION_1_1)
extern(System):
else
extern(C):
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Walter Bright <bugzilla digitalmars.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
CC| |bugzilla digitalmars.com
Resolution| |INVALID
--- Comment #3 from Walter Bright <bugzilla digitalmars.com> 2011-03-15
11:34:16 PDT ---
This is not a bug. A linkage declaration that ends in ':' runs to the end of
the block, which in this case is the end of the version declaration.
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http://d.puremagic.com/issues/show_bug.cgi?id=5739 --- Comment #4 from Jacob Carlborg <doob me.com> 2011-03-15 12:30:42 PDT --- But how does he get "Error: undefined identifier foo"? Shouldn't "foo" just be declared as a regular function? -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email ------- You are receiving this mail because: -------
Mar 15 2011
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Trass3r <mrmocool gmx.de> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |REOPENED
Resolution|INVALID |
--- Comment #5 from Trass3r <mrmocool gmx.de> 2011-03-18 02:45:55 PDT ---
Yep, the second issue still persists.
I found out what I originally wanted to do can be achieved via:
extern(C):
version(Bla)
extern(Windows): // though replacing this with mixin("extern(Windows):");
doesn't work, then extern(C) wins
void foo();
But as soon as you have 2 blocks like
version(Bla)
extern(Windows):
version(Blub)
extern(C++):
and Blub isn't set, it fails with "undefined identifier foo"
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Mar 18 2011
http://d.puremagic.com/issues/show_bug.cgi?id=5739
--- Comment #6 from Trass3r <mrmocool gmx.de> 2011-03-18 02:57:13 PDT ---
Ah never mind, turns out it doesn't work.
extern(C):
version(Bla)
extern(Windows):
void foo();
fails as soon as Bla isn't defined. I guess it has to do with the parser.
Because of the ':' it probably gets read like:
version(Bla)
{
extern(Windows):
void foo();
}
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Mar 18 2011
http://d.puremagic.com/issues/show_bug.cgi?id=5739
Walter Bright <bugzilla digitalmars.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|REOPENED |RESOLVED
Resolution| |INVALID
--- Comment #7 from Walter Bright <bugzilla digitalmars.com> 2012-01-20
18:57:36 PST ---
(In reply to comment #4)
But how does he get "Error: undefined identifier foo"? Shouldn't "foo" just be
declared as a regular function?
It gets parsed like:
extern(C): void foo();
and so foo is undefined.
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Jan 20 2012