G-Mail wrote:
I like to know the default include path gcc use. GCC start including
files in a defined order of directories
starting with directories defined during build of gcc. I think there is
an command-line option which list
each include directory but I can't remember the option.
I know gcc -v .....
The preprocessor part, 'cpp', uses the headers, not 'gcc', so quite
logically you should try 'cpp -v' and
not 'gcc -v' !
Ok, this subject was discussed for a while ago, but I can repeat the
recent situation :
- there is no 'standard way' to see those header search paths,
especially with other
languages than C
- the "real" cpp is nowadays integrated into the 'cc1', 'cc1plus' etc.
"real" compilers,
so using the '-v' with them would be one solution. For instance :
`gcc -print-prog-name=cc1plus` -v
via "command substitution" on Unix-like shells, the output of the
command is used
as the new command and so that '$full_pathname_of_cc1plus -v'
command is used
and the C++ and C headers search paths can be seen....
- only wishes about the 'cpp -print-search-dirs' giving those search
paths can be given,
someone should be that kind and implement this and then struggle so
that this could
be put into the official GCC sources. Or the 'gcc -print-search-dirs'
could also give
the headers search paths, for C... Then 'g++ -print-search-dirs'
could show also
the C++ search paths.
Here are what once worked for C and C++ (giving options to the "real"
cpp) :
[root@Dell ~]# cpp-redhat7.3-3.2 -Wp,-v
GNU CPP version 3.2.3 (cpplib) (i386 Linux/ELF)
ignoring nonexistent directory "NONE/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/local/include
/usr/local/lib/gcc-lib/i386-redhat-linux7.3/3.2.3/include
/usr/local/i386-redhat-linux7.3/sys-include
/usr/local/i386-redhat-linux7.3/include
End of search list.
[root@Dell ~]# cpp-redhat7.3-3.2 -Wp,-lang-c++,-v
GNU CPP version 3.2.3 (cpplib) (i386 Linux/ELF)
ignoring nonexistent directory "NONE/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/local/include/c++/3.2.3
/usr/local/include/c++/3.2.3/i386-redhat-linux7.3
/usr/local/include/c++/3.2.3/backward
/usr/local/include
/usr/local/lib/gcc-lib/i386-redhat-linux7.3/3.2.3/include
/usr/local/i386-redhat-linux7.3/sys-include
/usr/local/i386-redhat-linux7.3/include
End of search list.
But things will change quite unexpectedly....