openSUSE Programming April 2006

programming@lists.opensuse.org

12 participants
13 discussions

by Maura Edeweiss Monville

White smoke ... I succeeded in creating the Monte Carlo executable that links the CERN library and the Tcl/Tk .a and .h files. I just got rid of a macro that is proprietary for Sun Unix but it's deleterius on Linux/Suse. The culprit is " -Df2cFortran". This option was in the list of the CFLAGS and CXXFLAGS. I realized it was junk when I launched "make -p". This is a left-over from the installation procedure for Sun. It's just amazing that "make" did not complain about it ! Thank you all for assisting me through this nightmare. Maura

15 years, 5 months

How-To interpret the Stack Trace information with Tcl/Tk

by Maura Edeweiss Monville

As you all have figured out I'm very new to Tcl/Tlk. I was assigned the hard task to fix a couple of bugs in a Tcl/Tk GUI implemented by someone else. The existent GUI allows for left-button clicking on a color-coded particles flux representation. The numeric value of the flux is correctly displayed on a Point info widget. But for values greater than 10^9 (1e9) an error message pops up on the screen which reads: "Error in Tcl Script Error: integer value too large to represent. OK Skip Messages Stack Trace" If I click on the Stack Trace button I get the following info that I cannot quite understand: integer value too large to represent while executing "expr $num-int($num)" (procedure "format_vis" line 29) invoked from within "format_vis $hst_id """ (procedure "show_info_frame" line 106) invoked from within "show_info_frame 304 335" (command bound to event) In fact the package I'm testing includes a module named "mf.tcl" which is a sequential collection of procs. There is indeed the following boud proc: bind $base.canvas_field <Button-1> {show_info_frame %x %y} proc show_info_frame { h v } { **** Question: **** Is the 106 indicated in the Stack Trace an offset inside the proc show_info_frame ? The proc show_info_frame is at line 1558 of the "mf.tcl" file. If I add ( 1558 + 106) = 1664 which is a line inside the proc show_info_frame but such a proc is NOT recursive. I mean it doesn't call itself. Infact at line 1664 there is the following statement: if { $plot(info_frame) == "" } { There is indeed an "info_frame" but it's not a call to proc show_info_frame. I would appreciate if someone could help me interpret the information provided in the Stack Trace with the hope that helps me find and fix the bug. Thank you in advance for your help, Maura

15 years, 5 months

What is the meaning of the option -X32 ?

by Maura Edeweiss Monville

I tried to get some info for the Tcl/Tk library file that is not linked because it is regarded by the linker as "incompatible". . mauede@linux:/home/mokhov/restricted/mars15/linux/lib> file -k libm15gui_linux.a libm15gui_linux.a: current ar archive\012- archive file\012- Assembler source Then I enquired about "ar". I remember Dr.Mockov typing "ar" during our Monte Carlo code installation attempt. In fact I had never seen such a command before and asked him about it. He said it archives files. I just typed in "man ar" and read the following: mauede@linux:~/cernlib.32-2005-ifh.de/2005/lib> man ar NAME ar - create, modify, and extract from archives ...................................................................... ...................................................................... ar ignores an initial option spelt -X32_64, for compatibility with AIX. The behaviour produced by this option is the default for GNU ar. ardoes not support any of the other -X options; in particular, it does not support -X32 which is the default for AIX ar. What is the meaning and consequence of not supporting the option "-X32" ? I do not know what this option does (never seen before) and am caught by phobia at reading he magic number "32" .... I wonder if there is any relation with this unsupported option and the linker regarding the file "libm15gui_linux.a" as incompatible with the rest of the objects being generated by compiling with the option -m32 .... See the following errors returned by the linker .... ************************************************************************* * Errors from launching the make that includes all libraries * ************************************************************************* mauede@linux:/home/mokhov/restricted/mars15> make g77 -m32 -static -L/home/mauede/cernlib.32- 2005-ifh.de/2005/lib -L/home/mokhov/restricted/mars15/linux/lib -L/home/mokhov/restricted/mcnp4c/linux/lib -L/home/mokhov/restricted/mars15/linux/lib -L/home/mokhov/restricted/mars15/linux/lib -o rmars-bnab-fems-linux marsmain.o m1505.o -lm15gui_linux -lm15linux -lm15fems_linux -lm15trneu_linux -lm15treem_linux -lm15eve_linux -lm15cem03_linux -lm15ext_linux -lm15blb_linux -lm15mpino_linux -lm15linux -lpacklib -ltk8.3 -ltcl8.3 -L/usr/X11R6/lib -lX11 -ldl -lnsl -lpthread /usr/lib64/gcc-lib/x86_64-suse-linux/3.3.5/../../../../x86_64-suse-linux/bin/ld: skipping incompatible /home/mokhov/restricted/mars15/linux/lib/libm15gui_linux.a when searching for -lm15gui_linux /usr/lib64/gcc-lib/x86_64-suse-linux/3.3.5/../../../../x86_64-suse-linux/bin/ld: skipping incompatible /home/mokhov/restricted/mars15/linux/lib/libm15gui_linux.a when searching for -lm15gui_linux /usr/lib64/gcc-lib/x86_64-suse-linux/3.3.5/../../../../x86_64-suse-linux/bin/ld: skipping incompatible /home/mokhov/restricted/mars15/linux/lib/libm15gui_linux.a when searching for -lm15gui_linux /usr/lib64/gcc-lib/x86_64-suse-linux/3.3.5/../../../../x86_64-suse-linux/bin/ld: cannot find -lm15gui_linux collect2: ld returned 1 exit status make: *** [rmars-bnab-fems-linux] Error 1 -- Maura E.M

15 years, 6 months

diagnosing a stack corruption

by Per Jessen

All, I've got a suspected stack corruption, and as it involves an external library, I'm trying to determine who's to blame - my code or the library code. Without exception, the resulting segfault always happens in the external library (libclamav). Equally without exception, if I omit the single call to the library (cl_scanfile()), I see no problems. I'm not particularly familiar with the libclamav code, nor so I have a desire to become so, so I was hoping to come up with something that says the problem is in libclamav - without diagnosing the problem all the way. It's little difficult to reproduce - I have had stresstests run for 24+ hours before it happened, but it has also happened within 30mins of starting a test. /Per Jessen, Zürich

15 years, 6 months

Abemus MARS15 ...

by Maura Edeweiss Monville

White smoke ... I succeeded in creating the Monte Carlo executable that uses the CERN library and Tcl/Tk .a and .h files ! I just got rid of a macro that is proprietary for Sun Unix but it's deleterius on Linux/Suse. The culprit option was " -Df2cFortran" Thank you all for assisting me through this nightmare. Maura

15 years, 6 months

Can a native 64-bit CPU run 32-bit code ?

by Maura Edeweiss Monville

My laptop has a AMD Athlon 64 Processor 3700+, Architecture is x86_64. My problem is that I have to compile a code that will then be linked to pre-compile binaries produced on 32-bit machines. In short, everything must be compiled to generate 32-bit code for the sake of compatibility. There should be an option in the gcc compiler that forces it to generate 32-bit code.. But assuming I've got an executable for 32-bit machines, then can I run such an exectable on MY OWN laptop which is 64-bit ? If the answer is "yes" (I hope so) then I'd be grateful to know how I can do that . Thank you in advance for your help. Maura

15 years, 6 months

C++ Question on using endl or newline

by Jerry Feldman

I've seen a number of documents and code that prefers to use the newline character ("\n" or '\n') rather than std::endl In the general case, the issue is that endl forces a buffer flush where '\n' does not, and therefore using the newline is more efficient. However, using endl is more portable. Either way works fine on Linux. Comments... -- Jerry Feldman <gaf(a)blu.org> Boston Linux and Unix user group http://www.blu.org PGP key id:C5061EA9 PGP Key fingerprint:053C 73EC 3AC1 5C44 3E14 9245 FB00 3ED5 C506 1EA9

15 years, 6 months

Real Numbers representation in Tcl language

by Maura Edeweiss Monville

Is it possible that on a 32-bit machine the maximum value for a Real number in Tcl language is 10^10 ? Instinctively I'd saythe number of bits assigned to the representation of a Real number is independent on the machine h/w architecture ... but I'm not familiar with Tcl and may be mistaken ... Thank you, MEM

15 years, 6 months

Re: [suse-programming-e] Real Numbers representation in Tcl language

by Mark Gray

Maura Edeweiss Monville <memonvil(a)artsci.wustl.edu> writes: > Is it possible that on a 32-bit machine the maximum value for a Real > number in Tcl language is 10^10 ? See: http://wiki.tcl.tk/11969 "Computers and real numbers" The maximum range for Tcl is 1.0e-200 to 1.0e+200, but the precision is only 12 to 13 decimals. There are arbitrary precision Tcl library packages available which are mentioned in that article. > Instinctively I'd saythe number of bits assigned to the representation of > a Real number is independent on the machine h/w architecture ... but I'm > not familiar with Tcl and may be mistaken ...

15 years, 6 months

Tcl/Tk question

by Maura Edeweiss Monville

I apologize for posting a question to the wrong mailing list. I'm relying on the generosity and understanding of the subscribers. I've no experience of programming in Tcl language. Today I was shown the wierd behaviour of a Tcl/Tk GUI and asked to help fix the following problem. Basically a parameter representing a scale factor is entered through the keyboard. If the entered value is less than 10^10 then the program behaviour is correct. If the entered value exceeds 10^10 then no error is eturned but the interface behaviour is not correct as the scaling factor is not correctly applied. Questions: 1) is there a maximum value that can be represented ? 2) if the answer to 1) is "yes" then is 10^10 the maximum value that can be stored in a variable ? 3) if the answers to both 1) and 2) is "yes" then is it possible to deal with values greater than 10^10 ? How ? Thank you very much for your help. Maura

15 years, 6 months

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openSUSE Programming April 2006