| Summary: | address taken prevents uninitialized variable warning | ||
|---|---|---|---|
| Product: | gcc | Reporter: | nomura |
| Component: | c | Assignee: | Not yet assigned to anyone <unassigned> |
| Status: | RESOLVED DUPLICATE | ||
| Severity: | normal | CC: | gcc-bugs |
| Priority: | P2 | ||
| Version: | 3.4.1 | ||
| Target Milestone: | --- | ||
| Host: | i686-pc-linux-gnu | Target: | i686-pc-linux-gnu |
| Build: | i686-pc-linux-gnu | Known to work: | |
| Known to fail: | Last reconfirmed: | ||
Compiling this code with -O -Wall should warn that "i" is used without being initialized. The presence of "p = &i" stops this warning from being issued, but the address is not exposed in a way that could affect i. (No path from the address taken to the use, and the variable is local). If the uninit warning could be strengthened it would have real benefits. -- Source code: int *p; void foo () { int i; if (i < 100) return; p = &i; } -- Command line: [gecko]$ xgcc-3.4 -v -c -O2 a.c -Wall -Werror Reading specs from /u/nomura/dl/gcc-3.4.1_linux/gcc/specs Configured with: ../gcc-3.4.1/configure --enable-languages=c,c++ --prefix=/x/sim/nomura/root.linux/gcc-3.4.1 Thread model: posix gcc version 3.4.1 /u/nomura/dl/gcc-3.4.1_linux/gcc/cc1 -quiet -v -iprefix /u/nomura/dl/gcc-3.4.1_linux/gcc/../lib/gcc/i686-pc-linux-gnu/3.4.1/ -isystem /u/nomura/dl/gcc-3.4.1_linux/gcc/include a.c -quiet -dumpbase a.c -mtune=pentiumpro -auxbase a -O2 -Wall -Werror -version -o /tmp/ccN7EB39.s ignoring nonexistent directory "/u/nomura/dl/gcc-3.4.1_linux/gcc/../lib/gcc/i686-pc-linux-gnu/3.4.1/include" ignoring nonexistent directory "/u/nomura/dl/gcc-3.4.1_linux/gcc/../lib/gcc/i686-pc-linux-gnu/3.4.1/../../../../i686-pc-linux-gnu/include" ignoring nonexistent directory "/x/sim/nomura/root.linux/gcc-3.4.1/lib/gcc/i686-pc-linux-gnu/3.4.1/../../../../i686-pc-linux-gnu/include" #include "..." search starts here: #include <...> search starts here: /u/nomura/dl/gcc-3.4.1_linux/gcc/include /usr/local/include /x/sim/nomura/root.linux/gcc-3.4.1/include /x/sim/nomura/root.linux/gcc-3.4.1/lib/gcc/i686-pc-linux-gnu/3.4.1/include /usr/include End of search list. GNU C version 3.4.1 (i686-pc-linux-gnu) compiled by GNU C version 3.2 20020903 (Red Hat Linux 8.0 3.2-7). GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072 /x/sim/nomura/root.linux/gcc-3.4.1/lib/gcc/i686-pc-linux-gnu/3.4.1/../../../../i686-pc-linux-gnu/bin/as --traditional-format -V -Qy -o a.o /tmp/ccN7EB39.s GNU assembler version 2.15 (i686-pc-linux-gnu) using BFD version 2.15 [gecko]$