Hi, Global works by project base not file base. That's different from ctags. Gtags must be invoked at the project root directory. And tag files basically should be put on the same directory. 'GTAGS' has a role of a mark of the project.
$ cd /usr/include $ gtags $ ls G* GPATH GRTAGS GTAGS However, you wouldn't want to make tag files at a shared directory like '/usr/include'. Instead, you can use 'obj' directory. Please try the following. 1. make an obj directory $ mkdir $HOME/obj $ export MAKEOBJDIRPREFIX=$HOME/obj 2. make tag files $ cd /usr/include $ gtags -O # -O: use obj directory $ cd <your project> $ gtags -O $ export GTAGSLIBPATH=/usr/include $ global -xa printf Tag files are made in the obj directory. Regards, Shigio 2015-07-10 22:49 GMT+09:00 Raffaele Ricciardi <rfflrc...@gmail.com>: > Hello, > > I am trying to use Global to lookup tags for each C library that a > project may use, by using GTAGSLIBPATH. The caveat is that I would like > to generate Global files out of source, while discriminating libraries > that may share their directory (this is what happens in */usr/include/*). > > So far, I have generated Global files successfully, but `global' doesn't > reference the original files correctly. For instance, for the standard > C library, this is what happens when I run `global' from the directory > of a project: > > $ global -xs printf > Warning: source file './stdio.h' is not available. > printf 362 stdio.h > ... > > That is: `global' expects to find library files in the directory of the > project, instead of their own directory. In this case, I would have > expected *stdio.h* to be referenced as */usr/include/stdio.h* instead. > > I am going to describe what I have done. I am using Global 6.5 > (compiled with Exuberant Ctags 5.8) and the last version of Pygments. > > First, I have created a directory to cache the Global files for the > standard C library: > > $ mkdir --parents ~/.cache/gtags/standard-c > $ cd ~/.cache/gtags/standard-c > > In this directory, I have generated a file with the list of headers that > `gtags' will parse: > > $ find /usr/include/*.h -type f > gtags.file > $ cat gtags.file > /usr/include/aio.h > ... > > Now, I would have expected `gtags' to be able to process `gtags.file' > from here, because it contains absolute paths, but `gtags' warns that it > is ignoring all those files because they are "out of source tree". > Apparently, I must move to the directory that contains those files > beforehand (indeed, this is the approach followed by the Tutorial). > Therefore: > > $ pushd /usr/include/ > /usr/include ~/.cache/gtags/standard-c > $ gtags -c -f ~/.cache/gtags/standard-c/gtags.file > ~/.cache/gtags/standard-c > $ popd > > Let's check that `gtags' has worked: > > $ ls > GPATH GRTAGS GTAGS gtags.file > > OK. Let's lookup a symbol: > > $ global -xs printf > Warning: source file './stdio.h' is not available. > printf 362 stdio.h > ... > > Why *./stdio.h* instead of */usr/include/stdio.h*? Thank you. > > _______________________________________________ > Help-global mailing list > Help-global@gnu.org > https://lists.gnu.org/mailman/listinfo/help-global > -- Shigio YAMAGUCHI <shi...@gnu.org> PGP fingerprint: D1CB 0B89 B346 4AB6 5663 C4B6 3CA5 BBB3 57BE DDA3
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