Add lsan.supp and fix suppressions file path

LSAN_OPTIONS referenced a relative 'lsan.supp' path but CTest runs
from the build directory.  Use an absolute path derived from the
source/workspace root so the file is always found.

Also adds the lsan.supp suppressions file with initial rules for
libfbclient, libodbc, and libodbcinst.

Author: fdcastel

.github/workflows/build-and-test.yml

@@ -52,7 +52,7 @@ jobs:
         env:
           API_GITHUB_ACCESS_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           ASAN_OPTIONS: ${{ matrix.sanitizer == 'Asan' && 'detect_leaks=1:halt_on_error=1:print_stats=1' || '' }}
-          LSAN_OPTIONS: ${{ matrix.sanitizer == 'Asan' && 'suppressions=lsan.supp' || '' }}
+          LSAN_OPTIONS: ${{ matrix.sanitizer == 'Asan' && format('suppressions={0}/lsan.supp', github.workspace) || '' }}
         run: Invoke-Build test -Configuration ${{ matrix.config }} -Sanitizer ${{ matrix.sanitizer }} -File ./firebird-odbc-driver.build.ps1
 
       - name: Upload driver (Windows)

firebird-odbc-driver.build.ps1

@@ -142,7 +142,8 @@ task test build, build-test-databases, install, {
 	# Set sanitizer runtime options
 	if ($Sanitizer -eq 'Asan' -and -not $IsWindowsOS) {
 		$env:ASAN_OPTIONS = 'detect_leaks=1:halt_on_error=1:print_stats=1'
-		$env:LSAN_OPTIONS = 'suppressions=lsan.supp'
+		$lsanSupp = Join-Path $BuildRoot 'lsan.supp'
+		$env:LSAN_OPTIONS = "suppressions=$lsanSupp"
 		print Cyan "ASAN_OPTIONS=$env:ASAN_OPTIONS"
 	}
 

lsan.supp

@@ -0,0 +1,12 @@
+# LeakSanitizer suppressions for Firebird ODBC Driver test suite
+#
+# This file suppresses known leak reports from third-party libraries
+# (Firebird client, unixODBC, system allocators, etc.).
+# Populate as false positives are discovered during ASAN/LSAN runs.
+#
+# Usage:
+#   export LSAN_OPTIONS="suppressions=lsan.supp"
+
+leak:libfbclient
+leak:libodbc
+leak:libodbcinst