Description of problem: I just tried to compile package tetex-2.0.2-8 from Fedora. The compiler said 1. mapfile.c:164: warning: operation on `str' may be undefined The source code is hash_code_upper ^= (*str << 8) + *++str; This code is undefined. Better code is hash_code_upper ^= (str[ 0] << 8) + str[ 1]; ++str; 2. mapfile.c:168: warning: operation on `str' may be undefined Same problem again. 3. emspecial.c:1052: warning: operation on `s' may be undefined The source code is *s++ = (*s & 0xf0) | (ch & 0x0f); Better code is *s = (*s & 0xf0) | (ch & 0x0f); ++s; 4. token.c:111: warning: operation on `exponent' may be undefined The source code is exponent = -(++exponent >> 1); /* portable C for -(exponent/2) */ It is not wise to increment a variable and assign to it in the same statement. The comment is particularly wrong. 5. pdftex1.c(4333): remark #592: variable "notprintedplusyet" is used before its value is set Missing initialisation of local variable notprintedplusyet. 6. pdfetex1.c(7150): remark #592: variable "notprintedplusyet" is used before its value is set Same problem as above. Version-Release number of selected component (if applicable): tetex-2.0.2-8 How reproducible: Steps to Reproduce: 1. 2. 3. Actual results: Expected results: Additional info: