valgrind: Search NIX_DEBUG_INFO_DIRS for debug info

Signed-off-by: Anders Kaseorg <andersk@mit.edu>

pkgs/development/tools/analysis/valgrind/debug-info-from-env.patch

@@ -0,0 +1,31 @@
+diff --git a/coregrind/m_debuginfo/readelf.c b/coregrind/m_debuginfo/readelf.c
+index c586e3f33..e3bb1717f 100644
+--- a/coregrind/m_debuginfo/readelf.c
++++ b/coregrind/m_debuginfo/readelf.c
+@@ -1508,13 +1508,25 @@ DiImage* find_debug_file( struct _DebugInfo* di,
+    HChar*   debugpath = NULL; /* where we found it */
+ 
+    if (buildid != NULL) {
++      const HChar *dir = VG_(getenv)("NIX_DEBUG_INFO_DIRS");
+       debugpath = ML_(dinfo_zalloc)("di.fdf.1",
+-                                    VG_(strlen)(buildid) + 33);
++                                    VG_(strlen)(buildid) + 33 +
++                                    (dir ? VG_(strlen)(dir) : 0));
+ 
+       VG_(sprintf)(debugpath, "/usr/lib/debug/.build-id/%c%c/%s.debug",
+                    buildid[0], buildid[1], buildid + 2);
+ 
+       dimg = open_debug_file(debugpath, buildid, 0, rel_ok, NULL);
++
++      while (!dimg && dir) {
++         const HChar *sep = VG_(strchr)(dir, ':');
++         Int size = sep ? sep - dir : VG_(strlen)(dir);
++         VG_(sprintf)(debugpath, "%.*s/.build-id/%c%c/%s.debug",
++                      size, dir, buildid[0], buildid[1], buildid + 2);
++         dimg = open_debug_file(debugpath, buildid, 0, rel_ok, NULL);
++         dir = sep ? sep + 1 : NULL;
++      }
++
+       if (!dimg) {
+          ML_(dinfo_free)(debugpath);
+          debugpath = NULL;

pkgs/development/tools/analysis/valgrind/default.nix

@@ -1,6 +1,7 @@
 { lib, stdenv, fetchurl, fetchpatch
 , autoreconfHook, perl
 , gdb, cctools, xnu, bootstrap_cmds
+, setupDebugInfoDirs
 }:
 
 stdenv.mkDerivation rec {
@@ -19,6 +20,7 @@ stdenv.mkDerivation rec {
       url = "https://bugsfiles.kde.org/attachment.cgi?id=143535";
       sha256 = "036zyk30rixjvpylw3c7n171n4gpn6zcp7h6ya2dz4h5r478l9i6";
     })
+    ./debug-info-from-env.patch
   ];
 
   outputs = [ "out" "dev" "man" "doc" ];
@@ -32,6 +34,10 @@ stdenv.mkDerivation rec {
   # Perl is also a native build input.
   nativeBuildInputs = [ autoreconfHook perl ];
 
+  # Not propagatedNativeBuildInputs because of
+  # https://github.com/NixOS/nixpkgs/issues/64992.
+  propagatedBuildInputs = [ setupDebugInfoDirs ];
+
   enableParallelBuilding = true;
   separateDebugInfo = stdenv.isLinux;