View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0000490 | GCC - GNU C Compiler | Bug | public | 2011-10-03 20:59 | 2020-08-24 03:07 |
| Reporter | dmik | Assigned To | psmedley | ||
| Priority | normal | Severity | minor | Reproducibility | have not tried |
| Status | closed | Resolution | fixed | ||
| Summary | 0000490: GCC4 emx plugin generates a N_EXP stub for local symbols | ||||
| Description | The full description of the problem is here: http://svn.netlabs.org/libc/ticket/220 (first two comments). Back then, I fixed this in emxomf.exe but the correct place to fix the problem is the emx plugin in GCC. I can't recall any test case for that ATM though. I will post one if I'm able to reproduce it. | ||||
| Tags | No tags attached. | ||||
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This applies to GCC 4.4.2 in the first place and I guess to all later versions as well. |
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I still see this with latest 4.4.6 and emxomf.exe from libc064: When building Qt: weakld: error: Unresolved symbol (UNDEF EXPORT) '_T.3808'. weakld: info: The symbol is referenced by: U:\dev\qt4_svn\src\gui\tmp\obj\release-shared\qmdisubwindow.obj Ignoring unresolved externals reported from weak prelinker. ** EXPERIMENTAL (HLL) ** Open Watcom Linker Version 1.6beta1 Limited Availability Portions Copyright (c) 1985-2002 Sybase, Inc. All Rights Reserved. Source code is available under the Sybase Open Watcom Public License. See http://www.openwatcom.org/ for details. Error! E3033: directive error near '/nofree' |
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still not sure what is causing thsi one - VERY frustrating |
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I'm actually thinking this might be a binutils issue - ie gas might be causing the problem.... he emx binutils patches have lots of references to N_EXP - perhaps one of these is causing the issues? |
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even to the point that the following definitions are in the binutils patches: +/* emx-specific symbols. */ +#define N_IMP1 0x68 /* Import reference (emx specific) */ +#define N_IMP2 0x6a /* Import definition (emx specific) */ +#define N_EXP 0x6c /* Export definition (emx specific) */ |
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not sure now.... with standard emxomf.exe, Qt fails with: U:\dev\qt4_svn\src\gui\tmp\obj\release-shared\qmdisubwindow.obj Ignoring unresolved externals reported from weak prelinker. Error! E2028: _T.3809 is an undefined reference Error! E2044: exported symbol _T.3809 not found make[1]: *** [..\..\lib\QtGui4.dll] Error 1 compiling qmdisubwindow.cpp with -S shows in the .S code: LLSDACSE6375: .text .p2align 4,,15 _T.3809: LFB7737: not sure if gas should be ignoring the _T.3809 symbol or if gcc shouldn't be outputting it in the first place.... |
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bug is in GCC, triggered by -O2 flag remove -O2 from tmp\obj\release-shared\CXXFLAGS.QtGui.Release.rsp does not put _T.3809 in the output and qtgui4.dll builds ok |
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Fixed in latest code |
| Date Modified | Username | Field | Change |
|---|---|---|---|
| 2011-10-03 20:59 | dmik | New Issue | |
| 2011-10-04 07:55 | dmik | Note Added: 0002014 | |
| 2011-11-06 06:03 | psmedley | Note Added: 0002038 | |
| 2011-11-12 08:06 | psmedley | Note Added: 0002040 | |
| 2011-11-12 08:20 | psmedley | Note Added: 0002041 | |
| 2011-11-12 08:21 | psmedley | Note Added: 0002042 | |
| 2011-11-13 01:10 | psmedley | Note Added: 0002043 | |
| 2011-11-13 01:22 | psmedley | Note Added: 0002044 | |
| 2011-11-16 19:56 | psmedley | Assigned To | => psmedley |
| 2011-11-16 19:56 | psmedley | Status | new => assigned |
| 2014-10-11 19:05 | psmedley | Note Added: 0002872 | |
| 2014-10-11 19:05 | psmedley | Status | assigned => resolved |
| 2014-10-11 19:05 | psmedley | Resolution | open => fixed |
| 2020-08-24 03:07 | psmedley | Status | resolved => closed |
