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December 09, 2010 [Issue 5337] New: DMD compiles incorrect code on windows | ||||
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http://d.puremagic.com/issues/show_bug.cgi?id=5337 Summary: DMD compiles incorrect code on windows Product: D Version: D2 Platform: x86 OS/Version: Windows Status: NEW Severity: normal Priority: P2 Component: DMD AssignedTo: nobody@puremagic.com ReportedBy: CrypticMetaphor88@gmail.com --- Comment #0 from CrypticMetaphor88@gmail.com 2010-12-09 08:50:08 PST --- Created an attachment (id=845) Compiling and running in windows command prompt Code that should not compile, imported from C, compiles on windows, but does NOT compile on Linux. Here the example: // cfile.c file extern int globalFromD; void functionFromC(int a) { globalFromD = a; } // end cfile.c // dfile.d extern(C) { // this is needed to make it available from C int globalFromD; } extern(C) { // also needed when listing the prototypes for your C functions void functionFromC(int); } import std.stdio; // for writefln int main() { globalFromD = 100; writefln("%d", globalFromD); functionFromC(500); writefln("%d", globalFromD); return 0; } // end dfile.d I compile with: dmc -c cfile.c And I get an cfile.obj, which is the object code (.o in gcc). Then I compile the D code dmd dfile.d cfile.obj and I get no errors, so I run it, the result: // start result C:\DCode\libtest>dfile.exe 100 100 C:\DCode\libtest> // end result I've posted this on the newsgroup( d.D.learn, Subject:"Calling C functions" ) and apparently it's some kind of bug. More info: dmc version: 8.42n dmd version: 2.050 Windows version: Windows XP. -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- |
December 09, 2010 [Issue 5337] DMD compiles incorrect code on windows | ||||
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Posted in reply to CrypticMetaphor88@gmail.com | http://d.puremagic.com/issues/show_bug.cgi?id=5337 Steven Schveighoffer <schveiguy@yahoo.com> changed: What |Removed |Added ---------------------------------------------------------------------------- Keywords| |wrong-code CC| |schveiguy@yahoo.com --- Comment #1 from Steven Schveighoffer <schveiguy@yahoo.com> 2010-12-09 08:56:03 PST --- I think this is a TLS issue. The linux errors I got (repeated from NG post): steves@steve-laptop:~/testd$ gcc -c testc.c steves@steve-laptop:~/testd$ ~/dmd-2.050/linux/bin/dmd testcallc.d testc.o /usr/bin/ld: globalFromD: TLS definition in testcallc.o section .tbss mismatches non-TLS reference in testc.o testc.o: could not read symbols: Bad value collect2: ld returned 1 exit status --- errorlevel 1 -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- |
December 09, 2010 [Issue 5337] DMD compiles incorrect code on windows | ||||
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Posted in reply to CrypticMetaphor88@gmail.com | http://d.puremagic.com/issues/show_bug.cgi?id=5337 Walter Bright <bugzilla@digitalmars.com> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED CC| |bugzilla@digitalmars.com Resolution| |INVALID --- Comment #2 from Walter Bright <bugzilla@digitalmars.com> 2010-12-09 10:16:40 PST --- It is a TLS issue. Globals in D2 are allocated in thread local storage, globals in C are not. To make it work, they have to be TLS in both languages, or regular globals in both. -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- |
December 09, 2010 [Issue 5337] DMD compiles incorrect code on windows | ||||
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Posted in reply to CrypticMetaphor88@gmail.com | http://d.puremagic.com/issues/show_bug.cgi?id=5337 --- Comment #3 from Steven Schveighoffer <schveiguy@yahoo.com> 2010-12-09 10:19:27 PST --- So why can the linux compiler detect the issue and not the windows compiler? -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- |
December 09, 2010 [Issue 5337] DMD compiles incorrect code on windows | ||||
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Posted in reply to CrypticMetaphor88@gmail.com | http://d.puremagic.com/issues/show_bug.cgi?id=5337 nfxjfg@gmail.com changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |nfxjfg@gmail.com --- Comment #4 from nfxjfg@gmail.com 2010-12-09 12:16:42 PST --- Maybe because OPTLINK is a dirty piece of shit and eats any crap without even spitting out warnings? -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- |
December 09, 2010 [Issue 5337] DMD compiles incorrect code on windows | ||||
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Posted in reply to CrypticMetaphor88@gmail.com | http://d.puremagic.com/issues/show_bug.cgi?id=5337 --- Comment #5 from Walter Bright <bugzilla@digitalmars.com> 2010-12-09 13:35:59 PST --- The linux compiler is not detecting the error, the linker is. The way TLS is implemented is radically different on Windows, Linux, and OSX. Linux does it with special linker fixups, Windows does it with specially generated code. The Windows linker cannot tell that it is supposed to be TLS access. -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- |
December 09, 2010 [Issue 5337] DMD compiles incorrect code on windows | ||||
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Posted in reply to CrypticMetaphor88@gmail.com | http://d.puremagic.com/issues/show_bug.cgi?id=5337 --- Comment #6 from nfxjfg@gmail.com 2010-12-09 13:42:47 PST --- @Walter: that's very unfortunate, this will cause lots of confusion among new users. Maybe make extern(C) variables __gshared by default? PS: optlink is a turd anyway. Also looking forward to optlink64. -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- |
December 10, 2010 [Issue 5337] DMD compiles incorrect code on windows | ||||
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Posted in reply to CrypticMetaphor88@gmail.com | http://d.puremagic.com/issues/show_bug.cgi?id=5337 Steven Schveighoffer <schveiguy@yahoo.com> changed: What |Removed |Added ---------------------------------------------------------------------------- Keywords|wrong-code | Status|RESOLVED |REOPENED Component|DMD |websites Resolution|INVALID | AssignedTo|nobody@puremagic.com |schveiguy@yahoo.com --- Comment #7 from Steven Schveighoffer <schveiguy@yahoo.com> 2010-12-09 16:11:48 PST --- thanks for the explanation. Perhaps this page needs to note these problems? http://www.digitalmars.com/d/2.0/interfaceToC.html I'll see if I can do that, I'm going to update this bug as a documentation issue. -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- |
January 20, 2012 [Issue 5337] Documentation regarding interfacing with C does not account for TLS differences | ||||
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Posted in reply to CrypticMetaphor88@gmail.com | http://d.puremagic.com/issues/show_bug.cgi?id=5337 Walter Bright <bugzilla@digitalmars.com> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|REOPENED |RESOLVED Resolution| |FIXED --- Comment #8 from Walter Bright <bugzilla@digitalmars.com> 2012-01-20 13:31:32 PST --- Fixed interfaceToC.html 2.058/1.073 -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- |
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