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

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

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>
---
 buildtools/pmdinfogen.py | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/buildtools/pmdinfogen.py b/buildtools/pmdinfogen.py
index 2a44f17bda..dfb89500c0 100755
--- a/buildtools/pmdinfogen.py
+++ b/buildtools/pmdinfogen.py
@@ -6,6 +6,7 @@
 import argparse
 import ctypes
 import json
+import re
 import sys
 import tempfile
 
@@ -66,11 +67,11 @@ def _get_symbol_by_name(self, name):
                 return [symbol]
         return None
 
-    def find_by_prefix(self, prefix):
-        prefix = prefix.encode("utf-8") if self._legacy_elftools else prefix
+    def find_by_pattern(self, pattern):
+        pattern = pattern.encode("utf-8") if self._legacy_elftools else pattern
         for i in range(self._symtab.num_symbols()):
             symbol = self._symtab.get_symbol(i)
-            if symbol.name.startswith(prefix):
+            if re.match(pattern, symbol.name):
                 yield ELFSymbol(self._image, symbol)
 
 
@@ -97,9 +98,9 @@ def __init__(self, data):
     def is_big_endian(self):
         return False
 
-    def find_by_prefix(self, prefix):
+    def find_by_pattern(self, pattern):
         for symbol in self._image.symbols:
-            if symbol.name.startswith(prefix):
+            if re.match(pattern, symbol.name):
                 yield COFFSymbol(self._image, symbol)
 
     def find_by_name(self, name):
@@ -199,7 +200,7 @@ def dump(self, file):
 
 def load_drivers(image):
     drivers = []
-    for symbol in image.find_by_prefix("this_pmd_name"):
+    for symbol in image.find_by_pattern("^this_pmd_name[0-9]+$"):
         drivers.append(Driver.load(image, symbol))
     return drivers
 
-- 
2.45.2