| Ticket UUID: | 3135271 | |||
| Title: | Link error due to hidden symbols (CentOS 4.2) | |||
| Type: | Bug | Version: | obsolete: 8.6b1.1 | |
| Submitter: | andygoth | Created on: | 2010-12-11 21:58:24 | |
| Subsystem: | 53. Configuration and Build Tools | Assigned To: | nijtmans | |
| Priority: | 5 Medium | Severity: | ||
| Status: | Closed | Last Modified: | 2010-12-14 05:38:47 | |
| Resolution: | Fixed | Closed By: | nijtmans | |
| Closed on: | 2010-12-13 22:38:47 | |||
| Description: |
On CentOS 4.2 (admittedly quite old), the Tcl/Tk build process can't link tclsh nor wish due to Tcl_Init and Tk_MainEx being hidden symbols in their respective lib*8.6.so files. This is with today's CVS. I fooled around with -DUSE_TCL_STUBS and similar but was unable to get it to work. CentOS 4.2 has gcc 3.4.4 and glibc 2.3.4. | |||
| User Comments: |
nijtmans added on 2010-12-14 05:38:47:
Committed to HEAD andygoth added on 2010-12-14 04:48:55: That patch fixes it. Thanks! Yes, all symbols were hidden. nijtmans added on 2010-12-13 17:13:48: >there's quite a thicket of complexity here... Yes, I know, I wrote it..... And when a compiler backports features, it becomes more compilcated, unfortunately. Feedback appreciated (first I would like to know if I am right about my suspicion, before changing anthing!!) dkf added on 2010-12-13 17:07:06: The current tcl.m4 SC_CONFIG_CFLAGS checks to see if the -fvisibility=hidden flag works (gcc only), otherwise if can use the __visibility__ attribute on the function (which MODULE_SCOPE is a concealing macro for). However, it also allows overriding of this; there's quite a thicket of complexity here... nijtmans added on 2010-12-13 04:49:04: Question: Are Tcl_Init and Tk_MainEx the only hidden symbols, or are simply ALL symbols hidden? I suspect that the gcc 3.4.4 compiler with CentOS, is modified to support --fvisitiliby=hidden, which normally is only included with gcc 4.x. Tcl's configure script picks this up, but tcl.h does not take that into account, and simply assumes that gcc < 4.0 does not have visibility support. This could explain why all symbols in the DSO's are hidden. The solution could be the same as used in zlib: Use the define NO_VIZ when the compiler has no visibility support, in stead of relying on the gcc version. Here is a patch doing that. Please try if this patch works as expected. nijtmans added on 2010-12-13 04:42:35: File Added - 395948: 3135271.patch nijtmans added on 2010-12-12 15:31:57: This must be related to FRQ #2959069, I'll have al look | |||
Attachments:
- 3135271.patch [download] added by nijtmans on 2010-12-13 04:42:35. [details]