Here is a test reproducing the problem: This produces the following error on GCC 4.8.4: Note that on GCC 6.2.0 the errors related to this question disappear, and it instead produces just: This has been reported a number of times by a number of users, on Stack Overflow, and elsewhere. I would like to understand … Read more
The reason for the warning is that the compiler suspects you might be trying to round-trip a pointer through int and back. This was common practice before the advent of 64-bit machines and it is not safe or reasonable. Of course here the compiler can clearly see that you’re not doing this, and it would be nice … Read more
Yes, this appears to be related to GCC bug 53119. It goes away if you change the C declaration to {{0}}. Your options are: Ignore the warning. Manipulate the C code after generation to have {{0}} instead of {0} on that line using sed or the like. Declare the array extern in Vala, and write the C definition elsewhere. (The permanent version of #2.) Do … Read more
However, avpicture_get_size is defined. No, as the header (<libavcodec/avcodec.h>) just declares it. The definition is in the library itself. So you might like to add the linker option to link libavcodec when invoking gcc: Please also note that libraries need to be specified on the command line after the files needing them: Not like this: Referring to Wyzard‘s comment, the complete command might look like … Read more
Right from the docs: -fpermissiveDowngrade some diagnostics about nonconformant code from errors to warnings. Thus, using -fpermissive will allow some nonconforming code to compile. Bottom line: don’t use it unless you know what you are doing!
The elegant way: The slightly ugly way: The slightly strange way: Note that the strtok function doesn’t work as expected if the user enters an empty string (i.e. presses only Enter). It leaves the \n character intact. There are others as well, of course.
What is the difference between the two, The g++ is a compiler driver. It knows how to invoke the actual compiler (cc1plus), assembler and linker. It does not know how to parse or compile the sources. and should I ever call cc1plus directly? No.
itoa is a non-standard function which is supported by some compilers. Going by the error, it’s not supported by your compiler. Your best bet is to use snprintf() instead.
28 You need a main function in date.c. Or you could just compile with -c to not link at this time and link the main function in later.
With CMake, it’s generally recommended to do an “out of source” build. Create your CMakeLists.txt in the root of your project. Then from the root of your project: And for Debug (again from the root of your project): Release / Debug will add the appropriate flags for your compiler. There are also RelWithDebInfo and MinSizeRel build configurations. You can modify/add to the flags by specifying a toolchain file in … Read more