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* [Bug c/21750] New: GCC gives may be used uninitialized warning for a non-conditional initialised variable. (not a duplicate bug!) @ 2005-05-25 12:57 j dot w dot r dot degoede at hhs dot nl 2005-05-25 14:04 ` [Bug c/21750] " j dot w dot r dot degoede at hhs dot nl ` (2 more replies) 0 siblings, 3 replies; 6+ messages in thread From: j dot w dot r dot degoede at hhs dot nl @ 2005-05-25 12:57 UTC (permalink / raw) To: gcc-bugs [-- Warning: decoded text below may be mangled, UTF-8 assumed --] [-- Attachment #1: Type: text/plain, Size: 3136 bytes --] I'm using Fedora Rawhide tree (FC4 develtree) the gcc rpm version is: --- [hans@cq229 ~]$ rpm -q gcc gcc-4.0.0-8 --- Gcc-version: --- Using built-in specs. Target: i386-redhat-linux Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --enable-shared --enable-threads=posix --enable-checking=release --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-libgcj-multifile --enable-languages=c,c++,objc,java,f95,ada --enable-java-awt=gtk --with-java-home=/usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/jre --host=i386-redhat-linux Thread model: posix gcc version 4.0.0 20050519 (Red Hat 4.0.0-8) --- Commandline triggering the bug: --- gcc -o gglide.o -Wall -W -I. -I../../incsrc -I../../minihwc -I../../cinit -I../../../swlibs/fxmisc -I../../../swlibs/newpci/pcilib -I../../../swlibs/fxmemmap -I../../../swlibs/texus2/lib -D__linux__ -DDRI_BUILD -DGLIDE3 -DGLIDE3_ALPHA -DGLIDE_HW_TRI_SETUP=1 -DGLIDE_INIT_HWC -DGLIDE_PACKED_RGB=0 -DGLIDE_PACKET3_TRI_SETUP=1 -DGLIDE_TRI_CULLING=1 -DUSE_PACKET_FIFO=1 -DH3 -DFX_GLIDE_H5_CSIM=1 -DFX_GLIDE_NAPALM=1 -DGLIDE_PLUG -DGLIDE_SPLASH -DHAVE_TEXUS2 -DGL_AMD3D -DGL_MMX -DGL_SSE -DGL_SSE2 -DGL_X86 -O2 -g -pipe -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -m32 -march=i386 -mtune=pentium4 -fasynchronous-unwind-tables -Wno-unused-parameter -save-temps -c gglide.c --- Compiling gglide.c with the above cmdline results in the following warnings: --- gglide.c: In function _grBufferClear2D: gglide.c:957: warning: clip0min may be used uninitialized in this function gglide.c:964: warning: height may be used uninitialized in this function gglide.c:964: warning: width may be used uninitialized in this function gglide.c:957: warning: command may be used uninitialized in this function --- I've attached an .i file as instructed. line 957 => 7312 in the .i file. Notice that command, width and height get initialised unconditional before use. (the offsetoff use is use of a member of a struct with the same name not of the variable). I've seen this same bug in another file too. The strange thing is that moving the "do { } while(0);" which contains "*_regGroupFifoPtr++ = ((height << 16) | width);" up a bit to line 7404, which moves it over a block which doesn't touch width or height makes the warning for width and height go away. I've seen the same thing in the other file moving the code using the var up over a (big) block which doesn't touch the var in any way makes the warning go away. It is as if gcc forgets that the var has been initialised if it isn't used for a number of lines. -- Summary: GCC gives may be used uninitialized warning for a non- conditional initialised variable. (not a duplicate bug!) Product: gcc Version: 4.0.0 Status: UNCONFIRMED Severity: normal Priority: P2 Component: c AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: j dot w dot r dot degoede at hhs dot nl CC: gcc-bugs at gcc dot gnu dot org http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21750 ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug c/21750] GCC gives may be used uninitialized warning for a non-conditional initialised variable. (not a duplicate bug!) 2005-05-25 12:57 [Bug c/21750] New: GCC gives may be used uninitialized warning for a non-conditional initialised variable. (not a duplicate bug!) j dot w dot r dot degoede at hhs dot nl @ 2005-05-25 14:04 ` j dot w dot r dot degoede at hhs dot nl 2005-05-25 18:34 ` [Bug middle-end/21750] " pinskia at gcc dot gnu dot org 2005-08-09 15:59 ` James dot Juran at baesystems dot com 2 siblings, 0 replies; 6+ messages in thread From: j dot w dot r dot degoede at hhs dot nl @ 2005-05-25 14:04 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From j dot w dot r dot degoede at hhs dot nl 2005-05-25 12:57 ------- Created an attachment (id=8965) --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=8965&action=view) File causing problem -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21750 ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug middle-end/21750] GCC gives may be used uninitialized warning for a non-conditional initialised variable. (not a duplicate bug!) 2005-05-25 12:57 [Bug c/21750] New: GCC gives may be used uninitialized warning for a non-conditional initialised variable. (not a duplicate bug!) j dot w dot r dot degoede at hhs dot nl 2005-05-25 14:04 ` [Bug c/21750] " j dot w dot r dot degoede at hhs dot nl @ 2005-05-25 18:34 ` pinskia at gcc dot gnu dot org 2005-08-09 15:59 ` James dot Juran at baesystems dot com 2 siblings, 0 replies; 6+ messages in thread From: pinskia at gcc dot gnu dot org @ 2005-05-25 18:34 UTC (permalink / raw) To: gcc-bugs -- What |Removed |Added ---------------------------------------------------------------------------- Component|c |middle-end Keywords| |diagnostic http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21750 ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug middle-end/21750] GCC gives may be used uninitialized warning for a non-conditional initialised variable. (not a duplicate bug!) 2005-05-25 12:57 [Bug c/21750] New: GCC gives may be used uninitialized warning for a non-conditional initialised variable. (not a duplicate bug!) j dot w dot r dot degoede at hhs dot nl 2005-05-25 14:04 ` [Bug c/21750] " j dot w dot r dot degoede at hhs dot nl 2005-05-25 18:34 ` [Bug middle-end/21750] " pinskia at gcc dot gnu dot org @ 2005-08-09 15:59 ` James dot Juran at baesystems dot com 2 siblings, 0 replies; 6+ messages in thread From: James dot Juran at baesystems dot com @ 2005-08-09 15:59 UTC (permalink / raw) To: gcc-bugs -- What |Removed |Added ---------------------------------------------------------------------------- CC| |James dot Juran at | |baesystems dot com http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21750 ^ permalink raw reply [flat|nested] 6+ messages in thread
[parent not found: <bug-21750-10702@http.gcc.gnu.org/bugzilla/>]
* [Bug middle-end/21750] GCC gives may be used uninitialized warning for a non-conditional initialised variable. (not a duplicate bug!) [not found] <bug-21750-10702@http.gcc.gnu.org/bugzilla/> @ 2005-11-26 7:40 ` gdr at gcc dot gnu dot org 2005-11-26 16:39 ` pinskia at gcc dot gnu dot org 1 sibling, 0 replies; 6+ messages in thread From: gdr at gcc dot gnu dot org @ 2005-11-26 7:40 UTC (permalink / raw) To: gcc-bugs -- gdr at gcc dot gnu dot org changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Ever Confirmed|0 |1 Last reconfirmed|0000-00-00 00:00:00 |2005-11-26 07:40:34 date| | http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21750 ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug middle-end/21750] GCC gives may be used uninitialized warning for a non-conditional initialised variable. (not a duplicate bug!) [not found] <bug-21750-10702@http.gcc.gnu.org/bugzilla/> 2005-11-26 7:40 ` gdr at gcc dot gnu dot org @ 2005-11-26 16:39 ` pinskia at gcc dot gnu dot org 1 sibling, 0 replies; 6+ messages in thread From: pinskia at gcc dot gnu dot org @ 2005-11-26 16:39 UTC (permalink / raw) To: gcc-bugs ------- Comment #2 from pinskia at gcc dot gnu dot org 2005-11-26 16:39 ------- We have: if (gc->contextP) { ... set hieght set width set clip0min set command ... } ... if (xxxxxx) {....} ... if (gc->contextP) { ... use clipOmin use command use hieght use width use clip0min ... } Anyways this is a dup of bug 5035 *** This bug has been marked as a duplicate of 5035 *** -- pinskia at gcc dot gnu dot org changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution| |DUPLICATE http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21750 ^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2005-11-26 16:39 UTC | newest] Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2005-05-25 12:57 [Bug c/21750] New: GCC gives may be used uninitialized warning for a non-conditional initialised variable. (not a duplicate bug!) j dot w dot r dot degoede at hhs dot nl 2005-05-25 14:04 ` [Bug c/21750] " j dot w dot r dot degoede at hhs dot nl 2005-05-25 18:34 ` [Bug middle-end/21750] " pinskia at gcc dot gnu dot org 2005-08-09 15:59 ` James dot Juran at baesystems dot com [not found] <bug-21750-10702@http.gcc.gnu.org/bugzilla/> 2005-11-26 7:40 ` gdr at gcc dot gnu dot org 2005-11-26 16:39 ` pinskia at gcc dot gnu dot org
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