On Fri, Sep 14, 2018 at 09:45:44PM +0200, Uwe Kleine-König wrote: > Hello, > > [Cc += sparse mailing list] Sorry for the late answer. > > > Santiago Vila wrote... > > > > > > > make -j1 check > > > > make[1]: Entering directory '/<<PKGBUILDDIR>>' > > > > sparse -g -O2 -fdebug-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -Wformat -Werror=format-security -std=gnu99 -Wall -Wextra -g -I. -DDO_DEBUG -I/usr/include/libnl3 *.[ch] > > > > /usr/include/err.h:25:11: error: unable to open 'stdarg.h' > > > > > > To reproduce this it's important to remove gcc-7 from the build chroot > > > (apt purge libgcc-7-dev ; apt --purge autoremove). > > > > > > Problem is, sparse appearently uses hardcoded paths and looks for > > > stdarg.h in (among other places) Well, sparse needs to know where it can find the system header files. There is an option for this: -gcc-base-dir (and -multiarch-dir). Usually you will want to use either some that are installed by your distro or the one that match the exact GCC version you're using. By *default*, if no -gcc-base-dir is used, sparse use the same dir as the one used by the GCC used to compile sparse itself. It's only this default that is hardcoded. > > > Solution is to rebuild sparse, building horst was successful then. > > > If this is true (please check!), the interesting question is why this > > > wasn't a problem in earlier gcc version bumps. > > I think this is a known limitation of sparse and there are three > ways to fix this (in my order of preference): > > a) let horst use cgcc -no-compile instead of sparse; or > b) let sparse depend on libgcc-7-dev (or whatever provides the > necessary files); or > c) use autodetection which gcc is used and pick its files. > > I'm not sure if a) fixes the problem. It fixed another problem we had > with horst's usage of sparse in the past though[1]. > > The downside of c) is that running this autodetection on every call to > sparse is probably slowing down sparse a bit which isn't nice. In case the default can't be used, like here, I think the best is to add in your Makefile something like: GCC_BASE_DIR=$(shell $(CC) -print-file-name=) SPARSE_FLAGS= -gcc-base-dir $(GCC_BASE_DIR) ... sparse $(SPARSE_FLAGS) ... This doesn't need to be done at each invocation of sparse (but will be done at each top-level make invocation). Regards, -- Luc
