What is the maximum size of signed long long data type in 32 bit Linux
The problem is that although you are using a 64bit data type, your calculations are using 32bit values, so you are encountering integer overflow. 140417 * 100000 is 14041700000 (0x344F356A0) in 64bit, but is 1156798112 (0x44F356A0) in 32bit. As you can see, 0x300000000 is being truncated off of the result,...
Does optimization change the behavior of casts?
It is extremely likely that any sane compiler will convert that entire expression (including the cast) into a constant when compiling with optimizations enabled. However, to be sure, you'll need to look at the assembly output of your compiler. But what about GCC 4.8.1 in particular? Code #include <stdint.h> #include...
What is the default for gcc -march option?
The default flags for gcc can be set when gcc itself is compiled. Run: gcc -Q --help=target to see what the default is on your machine. Likely it'll just be x86-64 even though the man page doesn't document that as a value for -march-...
install gcc 4.9 under suse10, “checking whether to enable maintainer-specific portions of Makefiles… no”
As a comment already mentioned, there is no error. The next step is to actually start building the compiler, and then install it. E.g. something like # How many cpu's to use NCPUS=4 make -j $NCPUS && make install Note that as you haven't specified a prefix for your configure...
Compile-time assertion fails without GCC optimization
Your compiletime_assert framework is relying on the optimizer performing dead code elimination to remove the call to prefix ## suffix. This is highly fragile and is in no way guaranteed to work. Instead, try using one of the solutions from Ways to ASSERT expressions at build time in C -...