From c527fd1f14c27855a37f2e8ac5346ce8d940ced2 Mon Sep 17 00:00:00 2001 From: Tudor Florea Date: Thu, 16 Oct 2014 03:05:19 +0200 Subject: initial commit for Enea Linux 4.0-140929 Migrated from the internal git server on the daisy-enea-point-release branch Signed-off-by: Tudor Florea --- .../gcc/gcc-4.8/0047-repomembug.patch | 53 ++++++++++++++++++++++ 1 file changed, 53 insertions(+) create mode 100644 meta/recipes-devtools/gcc/gcc-4.8/0047-repomembug.patch (limited to 'meta/recipes-devtools/gcc/gcc-4.8/0047-repomembug.patch') diff --git a/meta/recipes-devtools/gcc/gcc-4.8/0047-repomembug.patch b/meta/recipes-devtools/gcc/gcc-4.8/0047-repomembug.patch new file mode 100644 index 0000000000..868a4f3a51 --- /dev/null +++ b/meta/recipes-devtools/gcc/gcc-4.8/0047-repomembug.patch @@ -0,0 +1,53 @@ +When compiling a project using -frepo, .rpo files are written alongside +the .o file, the symbols either have O or C against them. During final linking, +the objects can be recompiled with some of the entries tweaked/chosen by the +tlink.c code (visible with TLINK_VERBOSE=3), it does this by changing O -> C +in the .rpo files. + +My tests showed that init_repo (cp/repo.c) was correctly calling +IDENTIFIER_REPO_CHOSEN against the right identifers and setting the +chosen bit. + +By the time finish_repo() or emit_repo_p() were called, the pointer returned +by get_identifier() for the symbol marked during init_repo had changed and +the chosen bit was no longer set. This lead to linking bugs like: + +collect: relinking +collect2: error: '_ZNK6sudoku5ClearINS_8SequenceEEclERS1_' was assigned to 'board.rpo', but was not defined during recompilation, or vice versa + +The problem is that the garbage collection is getting called before +finish_repo() is called and ggc_protect_identifiers is set to false +so the identifiers are not preserved. They are recreated but the +chosen bits get wiped out which is why the pointer changes and the +chosen bit is not set. + +The fix is to change ggc_protect_identifiers *after* the finish_repo +calls are made. + +Reproduction is tricky since you need to trigger the garbage collector at +just the right moment. + +RP 2013/10/9 + +[YOCTO #5133] + +Upstream-State: Pending + +Index: gcc-4.8.1/gcc/toplev.c +=================================================================== +--- gcc-4.8.1.orig/gcc/toplev.c 2013-03-28 08:29:51.000000000 +0000 ++++ gcc-4.8.1/gcc/toplev.c 2013-10-09 20:27:17.089228023 +0000 +@@ -551,11 +551,11 @@ + if (flag_syntax_only || flag_wpa) + return; + +- ggc_protect_identifiers = false; +- + /* This must also call finalize_compilation_unit. */ + lang_hooks.decls.final_write_globals (); + ++ ggc_protect_identifiers = false; ++ + if (seen_error ()) + return; + -- cgit v1.2.3-54-g00ecf