Well, I know that this is an old question, but I also found it frustrating that there is no precise info about options that are used during the linking process. This answer shows my journey to find them. First of all, I was looking into official docs https://gcc.gnu.org/onlinedocs/ – I searched the GCC Manual and … Read more
In the case of rpath, it makes no sense to use a relative path, since a relative path will be relative to the current working directory, NOT relative to the directory where the binary/library was found. So it simply won’t work for executables found in $PATH or libraries in pretty much any case. Instead, you … Read more
I’ve run into this annoyance, too. According to the GCC manpage -Wall turns on -Wunknown-pragmas for you, so just manually disable it using -Wno-unknown-pragmas after -Wall. There is a GCC feature request to make this work using #pragma GCC diagnostic: C++ preprocessor ignores #pragma GCC diagnostic
From http://www.gnu.org/software/make/manual/make.html: There is another assignment operator for variables, `?=’. This is called a conditional variable assignment operator, because it only has an effect if the variable is not yet defined. This statement: FOO ?= bar is exactly equivalent to this (see The origin Function): ifeq ($(origin FOO), undefined) FOO = bar endif Probably CC … Read more
While you can use the -fdump-tree-all and -fdump-rtl-all options in gcc, I don’t think that their output is very useful to a compiler student. FWIW, I started working on gcc as part of my PhD studies, having already completed two undergraduate courses, and I found gcc and its debug files to be opaque and hard … Read more
That depends on what the Makefile does/how it was written. It might not be possible. If your Makefile is reasonably “standard”, then this should work: make CFLAGS=”-g3 …” If it’s for C++: make CXXFLAGS=”-g3 …”
gcc will compile C source files as C and C++ source files as C++ if the file has an appropriate extension; however it will not link in the C++ library automatically. g++ will automatically include the C++ library; by default it will also compile files with extensions that indicate they are C source as C++, … Read more
clang -dM -E – < /dev/null will list all the preprocessor definitions for clang.
mpicc is just a wrapper around certain set of compilers. Most implementations have their mpicc wrappers understand a special option like -showme (Open MPI) or -show (Open MPI, MPICH and derivates) that gives the full list of options that the wrapper passes on to the backend compiler. For example, in Open MPI, wrappers are C++ … Read more
I think that coreset.o was compiled for 64-bit, and you are linking it with a 32-bit computation.o. You can try to recompile computation.c with the ‘-m64’ flag of gcc(1)