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we noticed that xterm in Gentoo started to produce broken color display when compiled with gcc-4.1 and -Os ... one of our devs ripped apart a small test case to illustrate the issue at hand (Debian shows the same issues) the trouble centers around a matrix declared as static volatile and is never initialized ... xterm expects the matrix to be zero set already, but when compiled with -Os, this just doesnt work example code attached ... to reproduce on an x86 host: gcc -Os badcode.c or on an amd64 host, just add -m32 -mike
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#include <stdio.h> int main() { static volatile char s[256][3]; /* default-initialised to 0 */ int i; for(i = 0; i < 256; i++) { if(i >= 16 && i < 256) printf("%d ", s[i - 16][0]); } printf("\n"); }
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