On Wed, May 22, 2019 at 9:46 AM Stanislav Fomichev <sdf@xxxxxxxxxxx> wrote:
>
> On 05/22, Alexei Starovoitov wrote:
> > On 5/22/19 9:15 AM, Andrii Nakryiko wrote:
> > > It's easy to have a mismatch of "intended to be public" vs really
> > > exposed API functions. While Makefile does check for this mismatch, if
> > > it actually occurs it's not trivial to determine which functions are
> > > accidentally exposed. This patch dumps out a diff showing what's not
> > > supposed to be exposed facilitating easier fixing.
> > >
> > > Signed-off-by: Andrii Nakryiko <andriin@xxxxxx>
> > > ---
> > > tools/lib/bpf/.gitignore | 2 ++
> > > tools/lib/bpf/Makefile | 8 ++++++++
> > > 2 files changed, 10 insertions(+)
> > >
> > > diff --git a/tools/lib/bpf/.gitignore b/tools/lib/bpf/.gitignore
> > > index d9e9dec04605..c7306e858e2e 100644
> > > --- a/tools/lib/bpf/.gitignore
> > > +++ b/tools/lib/bpf/.gitignore
> > > @@ -3,3 +3,5 @@ libbpf.pc
> > > FEATURE-DUMP.libbpf
> > > test_libbpf
> > > libbpf.so.*
> > > +libbpf_global_syms.tmp
> > > +libbpf_versioned_syms.tmp
> > > diff --git a/tools/lib/bpf/Makefile b/tools/lib/bpf/Makefile
> > > index f91639bf5650..7e7d6d851713 100644
> > > --- a/tools/lib/bpf/Makefile
> > > +++ b/tools/lib/bpf/Makefile
> > > @@ -204,6 +204,14 @@ check_abi: $(OUTPUT)libbpf.so
> > > "versioned symbols in $^ ($(VERSIONED_SYM_COUNT))." \
> > > "Please make sure all LIBBPF_API symbols are" \
> > > "versioned in $(VERSION_SCRIPT)." >&2; \
> > > + readelf -s --wide $(OUTPUT)libbpf-in.o | \
> > > + awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {print $$8}'| \
> > > + sort -u > $(OUTPUT)libbpf_global_syms.tmp; \
> > > + readelf -s --wide $(OUTPUT)libbpf.so | \
> > > + grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 | \
> > > + sort -u > $(OUTPUT)libbpf_versioned_syms.tmp; \
> > > + diff -u $(OUTPUT)libbpf_global_syms.tmp \
> > > + $(OUTPUT)libbpf_versioned_syms.tmp; \
> > > exit 1; \
> >
> > good idea.
> > how about removing tmp files instead of adding them to .gitignore?
> We should be able to do it without any temp files. At least in bash
> one can do:
>
> diff -u <(readelf -s --wide ${OUTPUT}libbpf-in.o | \
> awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {print $8}' | \
> sort -u) \
> <(readelf -s --wide ${OUTPUT}libbpf.so | \
> grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 | \
> sort -u)
>
> But might be complicated in the makefile :-/
that was my initial implementation, but it doesn't work in Makefile,
as it's bash-specific
