Based on example from Jacksonville’18 ISO C++ Report the syntax is correct, but it seems that it is not implemented yet: if (a>b) [[likely]] { 10.6.6 Likelihood attributes [dcl.attr.likelihood] draft
You should remove the braces: { and } around single values. struct TECH lut_model_1[2] = {{296.001465, 74.216972, 2.025908, 1.516384, 1, {0.001746, 0.000256, 0.006216, 0.005249, -0.001668, -0.001377, 0.009865, 0.010454, -0.000288, -0.005853, 0.010584, 0.015440, 0.000465, -0.000602, 0.004330, 0.005700, 0.017120, 0.233015, 0.034154, 0.244022, 0.007644, 0.385683, 0.042960, 0.406633, -0.007811, 0.346931, 0.040123, 0.387361, 0.007030, 0.225309, 0.017897, 0.241024, 0.003700, 0.103601, 0.060748, … Read more
Caolan Mc Namara, a LibreOffice developer, has made a small tool to detect this type of thing in LibreOffice source code. They had around thousands functions & methods unused in LibreOffice. His tool is a key element for removing them. It’s called callcatcher. It can collect functions/methods defined and subtract called/referenced It works directly on … Read more
If you need an option which works on both gcc and clang, your best bet is probably -Wmissing-prototypes. As indicated in the gcc documentation, this will trigger if a global function is defined and either: There was no previous declaration; or The previous declaration had no prototype. It does not complain if the previous declaration … Read more
Indeed this is a known problem in gcc. gcc is notorious for reporting incorrect uninitialized variables. The shortcomings have been duly noted and there is a initiative to overcome the shortcomings: Better Uninitialized Warnings: The GNU Compiler Collection warns about the use of uninitialized variables with the option -Wuninitialized. However, the current implementation has some … Read more
You can’t. The manual for GCC 4.4.0 is only comprehensive for that version, but it does list all the possible warnings for 4.4.0. They’re not all on the page you link to though. For instance, some language-specific options are on the pages for C++ options or Objective-C options. To find them all, you’re better off … Read more
gcc 4.4 will give you warning. In the later versions of gcc this feature (-Wunreachable-code) has been removed. See here: http://gcc.gnu.org/ml/gcc-help/2011-05/msg00360.html The -Wunreachable-code has been removed, because it was unstable: it relied on the optimizer, and so different versions of gcc would warn about different code. The compiler still accepts and ignores the command line … Read more
For a way to do this in C using GCC’s -Wenum-compare (which is enabled by default if you enable -Wall), you must perform a comparison on the enumeration constant before you pass it to the function in order to get the desired diagnostic. -Wenum-compare Warn about a comparison between values of different enumerated types. In … Read more
This is an unfortunate “bug” in C’s design; T (*p)[N] does not implicitly convert to T const (*p)[N]. You will have to either use an ugly cast, or have the function parameter not accept const. At first sight it looks like this conversion should be legal. C11 6.3.2.3/2: For any qualifier q, a pointer to … Read more
This is essentially the only portable way to print a function pointer. size_t i; int (*ptr_to_main)() = main; for (i=0; i<sizeof ptr_to_main; i++) printf(“%.2x”, ((unsigned char *)&ptr_to_main)[i]); putchar(‘\n’);