Re: [PATCH] buildtools: fix build with clang 17 and ASan

[David Marchand <david.marchand@redhat.com>]

On Fri, Jul 12, 2024 at 4:29 AM Jiale, SongX <songx.jiale@intel.com> wrote:
> > ASan included in clang 17 and later suffixes symbols.
> > $ nm build/drivers/libtmp_rte_net_null.a | grep this_pmd
> > 0000000000000000 r this_pmd_name3
> > 0000000000000000 n
> > this_pmd_name3.f2cd16678ab09dba8fd23405d8d11fce
> >
> > This breaks the detection of driver symbols in pmdinfogen which then creates
> > duplicate symbols "_pmd_info" in many drivers. Such duplicate symbols
> > trigger a link error.
> >
> > $ grep -w _pmd_info build/drivers/rte_net_*.pmd.c
> > build/drivers/rte_net_af_packet.pmd.c:const char _pmd_info[]
> >       __attribute__((used)) =
> >       "PMD_INFO_STRING= {\"name\": \"\", \"pci_ids\": []}";
> > build/drivers/rte_net_null.pmd.c:const char _pmd_info[]
> >       __attribute__((used)) =
> >       "PMD_INFO_STRING= {\"name\": \"\", \"pci_ids\": []}";
> >
> > A simple reproducer:
> > $ CC=clang meson setup build -Denable_apps=test-pmd -Ddisable_libs=* \
> >   -Denable_drivers=net/null,net/af_packet -Dtests=false \
> >   -Db_lundef=false -Db_sanitize=address
> >
> > $ ninja -C build
> >
> > Before this patch, the pmdinfogen script was relying on a symbol name
> > starting with this_pmd_name.
> > On the other hand, what this script needs is symbols whose names are
> > this_pmd_name ## __COUNTER__, see below an example for PCI driver
> > symbols (the same applies to other buses).
> >
> > $ git grep -w RTE_PMD_EXPORT_NAME drivers/bus/pci/bus_pci_driver.h
> > drivers/bus/pci/bus_pci_driver.h:RTE_PMD_EXPORT_NAME(nm,
> > __COUNTER__) $ git grep -B1 this_pmd_name lib/eal/
> > lib/eal/include/rte_dev.h-#define RTE_PMD_EXPORT_NAME(name, idx) \
> > lib/eal/include/rte_dev.h:static const char
> >       RTE_PMD_EXPORT_NAME_ARRAY(this_pmd_name, idx) \ $ git grep
> > define.RTE_PMD_EXPORT_NAME_ARRAY lib/eal/include/rte_dev.h
> > lib/eal/include/rte_dev.h:#define
> >       RTE_PMD_EXPORT_NAME_ARRAY(n, idx) n##idx[]
> >
> > Adjust the symbol filter for both ELF and COFF implementations.
> >
> > Bugzilla ID: 1466
> > Cc: stable@dpdk.org
> >
> > Reported-by: Ali Alnubani <alialnu@nvidia.com>
> > Reported-by: Song Jiale <songx.jiale@intel.com>
> > Signed-off-by: David Marchand <david.marchand@redhat.com>
> Tested-by: Jiale Song <songx.jiale@intel.com>

Applied, thanks.


-- 
David Marchand