Subject: ld error gcc aix - msg#00384

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RE: Looking for good Purify like memory check tool for gcc

If you want something that runs (only) on Linux, you might check out Valgrind: http://developer.kde.org/~sewardj/ Essentially it works by running your process in a sort of virtual machine environment, so it can detect all sorts of weirdness, but it can slow down your process quite a bit. Assuming that's not a problem for you, this may be a good tool. --- Tony Wetmore Raytheon Solipsys mailto:tony.wetmore@xxxxxxxxxxxx http://www.solipsys.com -----Original Message----- From: gcc-help-owner@xxxxxxxxxxx [mailto:gcc-help-owner@xxxxxxxxxxx] On Behalf Of Andy Howell Sent: Friday, July 25, 2003 1:52 PM To: Eljay Love-Jensen Cc: gcc-help@xxxxxxxxxxx Subject: Re: Looking for good Purify like memory check tool for gcc Eljay Love-Jensen wrote: > Hi Andy, > > I recommend IBM Rational PurifyPlus for Linux, and IBM Rational > PurifyPlus for Unix (Solaris). > > q.v. <http://www.rational.com/products/pqc/index.jsp> > > Or, alternatively, you can write your own general-purpose new, delete, > new[] and delete[] (and/or malloc/alloc/realloc/free) routines which > you've instrumented with start/end sentinels (for write-overruns) and > allocation tracking (for memory leaks). > > For a cheaper solution, try running your code through Borland's > CodeGuard. (Is CodeGuard still around...?) Eljay, Thanks. I've used Purify previously and was happy with it. I checked out the site, but could not get a price, as they are moving it over to IBM's site. This is for my own enjoyment, so I'm looking for something on the cheap, preferably open source. Andy

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Re: sizeof and allignment on 32bit target

On Fri, Jul 25, 2003 at 11:28:05AM +0200, Eric de Jong wrote: > Thank you, Jan Zizka, Roman Kellner > > I would expect that the allignment has only influence on the address of > variables, not on the total size of a structure. It looks like the compiler > calculates the size of the structure to be a multiple of the largest item in > the > structure. > What I want is to allign each variable in the structure to it's own size, but > the total size of the structure to be the actual size. Is this possible? Without using packed and aligned attributes, this is not possible. This can be a severe performance penalty on many architectures and are not supported by other compilers. According to the ISO C90 and C99 standards, the alignment of a structure or union is at least the maximum of the alignments of each of its members. A compiler can make structure and unions have even more alignment than the alignment of the members, for example some ABI's on word based machines will align any structure to a word boundary, even if all of the fields are chars, and on the machine I just did an ABI for, the compiler will align any structure with 2 or more words to double word alignment so the double word memory instructions can be more often used. This wording has been in the C specification ever since I can remember (and I used C on UNIX V6 PDP-11 machines). The reason for this is to make arrays and p++ work correctly. If the size were smaller, p++ would wind up pointing to unalgined memory. Note, also you are not guaranteed that short/int/long are the same size or alignment on different machines either. If you are reading files produced by another computer, you have to worry about endian issues as well. -- Michael Meissner email: gnu@xxxxxxxxxxxxxxxxx http://www.the-meissners.org

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aix linking problem

hello all! I have a situation. I dunno why. I have the following g++ -o cgijgui -g -static-libgcc -b64 -L /usr/local/lib cgijgui.o DynBu ffer.o javaglob.o spinbuffer.o globplatformimp_unix.o multibyte.o contextmodule .o javagui.o javaguiplatform_unix.o unixsubs.o cslocal.o login.o launch.o inifil e.o appstart.o /usr/local/lib/libfcgi.a -lstdc++ ld: 0706-005 Cannot find or open file: libgcc.a ld:open(): A file or directory in the path name does not exist. ld: 0706-005 Cannot find or open file: libgcc_eh.a ld:open(): A file or directory in the path name does not exist. ld: 0706-005 Cannot find or open file: libgcc.a ld:open(): A file or directory in the path name does not exist. ld: 0706-005 Cannot find or open file: libgcc_eh.a ld:open(): A file or directory in the path name does not exist. I don't know why the library couldn't open libgcc.a? __________________________________ Do you Yahoo!? Yahoo! SiteBuilder - Free, easy-to-use web site design software http://sitebuilder.yahoo.com

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linux gcc

hello all! I would like to ask if anyone has encountered this problem. `_IOREAD' undeclared (first use this function) is there a work around to this? I think this is specific to redhat melissa __________________________________ Do you Yahoo!? Yahoo! SiteBuilder - Free, easy-to-use web site design software http://sitebuilder.yahoo.com