The following code doesn't compile with gcc, but does with Visual Studio: template <typename T> class A { public: T foo; }; template <typename T> class B: public A <T> { public: void bar() { cout << foo << endl; } }; I get the error: test.cpp: In member function ‘void B<T>::bar()’: test.cpp:11: error: ‘foo’ was not declared ...
I'm trying to solve the 3n+1 problem and I have a for loop that looks like this: for(int i = low; i <= high; ++i) { res = runalg(i); if (res > highestres) { highestres = res; } } Unfortunately I'm getting this error when I try to ...
My C code snippet takes the address of an argument and stores it in a volatile memory location (preprocessed code): void foo(unsigned int x) { *(volatile unsigned int*)(0x4000000 + 0xd4) = (unsigned int)(&x); } int main() { foo(1); while(1); } I used an SVN version of GCC for compiling this code. At the end of function fo...
With gcc, I want to shift the contents of an array of bytes by 12-bit to the left. For example, starting with this array: uint8_t shift[10] = {0, 0, 0, 0, 0, 0, 0, 0, 0x0A, 0xBC}; I'd like to shift it to the left by 12-bits resulting in: 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xAB, 0xC0, 0x00 ...
The product-group I work for is currently using gcc 3.4.6 (we know it is ancient) for a large low-level c-code base, and want to upgrade to a later version. We have seen performance benefits testing different versions of gcc 4.x on all hardware platforms we tested it on. We are however very scared of c-compiler bugs (for a good reason hi...
How do list the symbols being exported from a .so file. If possible, I'd also like to know their source (e.g. if they are pulled in from a static library). I'm using gcc 4.0.2, if that makes a difference ...
When building projects in C++, I've found debugging linking errors to be tricky, especially when picking up other people's code. What strategies do people use for debugging and fixing linking errors? ...
I created a C file in Eclipse on Windows and then used Cygwin to navigate to the directory. I called gcc on the C source file and a.exe was produced. How do I execute a.exe in the Cygwin shell? ...
I'm working on porting a Visual C++ application to GCC (should build on MingW and Linux). The existing code uses __try { ... } __except(1) { ... } blocks in a few places so that almost nothing (short of maybe out of memory type errors?) would make the program exit without doing some minimal logging. What are the options for doing somet...
I have a library I created, mylib.c: #include <mylib.h> int testlib() { printf("Hello world\n"); return (0); } mylib.h: #include <stdio.h> extern int testlib(); In my program, I've attempted to call this library function: myprogram.c: #include <mylib.h> int main (int argc, char *argv[]) { testlib(); return (0); ...
Is it possible for gcc to link against a library that was created with Visual C++? If so, are there any conflicts/problems that might arise from doing so? ...
What is the best way to measure exception handling overhead/performance in C++? Please give standalone code samples. I'm targeting Microsoft Visual C++ 2008 and gcc. I need to get results from the following cases: Overhead when there are no try/catch blocks Overhead when there are try/catch blocks but exceptions are not thrown Overh...
Why does the order in which libraries are linked sometimes cause errors? ...
I have an inherited project that uses a build script (not make) to build and link the project with various libraries. When it performs a build I would like to parse the build output to determine what and where the actual static libraries being linked into the final executable are and where are they coming from. The script is compiling ...
I'm trying to install 'quadrupel', a library that relies on ffmpeg on Solaris x86. I managed to build ffmpeg and its libraries live in /opt/gnu/lib and the includes are in /opt/gnu/include but when I try to build quadrupel, it can't find the ffmpeg headers. What flags/configuration is required to include those two directories in the pr...
Anyone know this compiler feature? It seems GCC support that. How does it work? What is the potential gain? In which case it's good? Inner loops? (this question is specific, not about optimization in general, thanks) ...
What would be the best way to write Objective-C on the Windows platform? Cygwin and gcc? Is there a way I can somehow integrate this into Visual Studio? Along those lines - are there any suggestions as to how to link in and use the Windows SDK for something like this. Its a different beast but I know I can write assembly and link in th...
Anyone had any success getting precompiled headers working with GCC? I have had no luck in my attempts and I haven't seen many good examples for how to set it up. I've tried on cygwin gcc 3.4.4 and using 4.0 on Ubuntu. ...
So I'm working on an exceedingly large codebase, and recently upgraded to gcc 4.3, which now triggers this warning: warning: deprecated conversion from string constant to ‘char*’ Obviously, the correct way to fix this is to find every declaration like char *s = "constant string"; or function call like void foo(char *s); foo...
I'm considering dumping boost as a dependency... atm the only thing that I really need is shared_ptr<>, and I can get that from std::tr1, available in gcc suite 4.* ...