Most compilers will automatically define: __SSE__ __SSE2__ __SSE3__ __AVX__ __AVX2__ etc, according to whatever command line switches you are passing. You can easily check this with gcc (or gcc-compatible compilers such as clang), like this: $ gcc -msse3 -dM -E – < /dev/null | egrep “SSE|AVX” | sort #define __SSE__ 1 #define __SSE2__ 1 #define … Read more
-g tells the compiler to store symbol table information in the executable. Among other things, this includes: symbol names type info for symbols files and line numbers where the symbols came from Debuggers use this information to output meaningful names for symbols and to associate instructions with particular lines in the source. For some compilers, … Read more
You need to add -fsanitize=address to compiler flags (both CFLAGS and CXXFLAGS) and linker flags (LDFLAGS). You’ve probably added it to your compiler flags only. Note that using explicit -lasan option has been widely discouraged by ASan developers (e.g. here) as it misses some other important linker flags. The only recommended way to link is … Read more
gcc -E file.c or g++ -E file.cpp will do this for you. The -E switch forces the compiler to stop after the preprocessing phase, spitting all it’s got at the moment to standard output. Note: Surely you must have some #include directives. The included files get preprocessed, too, so you might get lots of output. … Read more
It looks like you are most of the way there already. Well done with your investigation. Let’s see if I can help clear up the ‘why’ behind it. Here’s what the linker is doing. When you link your executable (‘main’ above) it has some symbols (functions and other things) that are unresolved. It will look … Read more
It is for resolving circular dependences between several libraries (listed between -( and -)). Citing Why does the order in which libraries are linked sometimes cause errors in GCC? or man ld http://linux.die.net/man/1/ld -( archives -) or –start-group archives –end-group The archives should be a list of archive files. They may be either explicit file … Read more
Passing -relocatable or -r to ld will create an object that is suitable as input of ld. $ ld -relocatable a.o b.o -o c.o $ gcc c.o other.o -o executable $ ./executable The generated file is of the same type as the original .o files. $ file a.o a.o: ELF 32-bit LSB relocatable, Intel 80386, … Read more
There is a way to suppress the path translation by setting MSYS_NO_PATHCONV=1 in Windows Git MSys or MSYS2_ARG_CONV_EXCL=”*” in MSYS2. Alternatively, you can set the variable only temporarily just for that command by putting the assignment just before the command itself: MSYS_NO_PATHCONV=1 arm-none-linux-gnueabi-gcc.exe -Wall -g \ -Wl,–dynamic-linker=/usr/lib/myrpath/ld-linux.so.3 \ -Wl,-rpath=/usr/lib/myrpath \ -I../targetsysroot/usr/include \ myprogram.c -o myprogram
Inside the gcc directory, do this command: ./contrib/download_prerequisites After that script, GMP, MPFR, and MPC will be ready to use. Continue with ./configure.
As already pointed out elsewhere on this site, see this page: Auto-Dependency Generation In short, gcc can automatically create .d dependency files for you, which are mini makefile fragments containing the dependencies of the .c file you compiled. Every time you change the .c file and compile it, the .d file will be updated. Besides … Read more