powerpc 32bit Linux Kernel widely uses .stabs pseudo-op to produce debugging information in stabs format. Faced an issue that during Linux Kernel build with Yocto build system for 32bit powerpc platform resulting vmlinux contains absolute path in .stabstr section that cannot be remapped with -fdebug-prefix-map option.
Yocto uses scripts/mkmakefile Linux Kernel build approach that allows to store all generated files outside of kernel source tree. With this approach each compilier invocation is performed with an absolute path to a file that will be compiled and this absolute path is recorded in init stab. There is no way to remap this path. Reuse remap_debug_filename api to make -fdebug-prefix-map flag aplicable for init stab. Signed-off-by: Denys Zagorui <[email protected]> --- meta/recipes-devtools/binutils/binutils-2.35.inc | 1 + ...-reproducibility-for-stabs-debugging-data.patch | 35 ++++++++++++++++++++++ 2 files changed, 36 insertions(+) create mode 100644 meta/recipes-devtools/binutils/binutils/0017-gas-improve-reproducibility-for-stabs-debugging-data.patch diff --git a/meta/recipes-devtools/binutils/binutils-2.35.inc b/meta/recipes-devtools/binutils/binutils-2.35.inc index 5ae9ec4..bc9107b 100644 --- a/meta/recipes-devtools/binutils/binutils-2.35.inc +++ b/meta/recipes-devtools/binutils/binutils-2.35.inc @@ -41,5 +41,6 @@ SRC_URI = "\ file://0014-Fix-rpath-in-libtool-when-sysroot-is-enabled.patch \ file://0015-sync-with-OE-libtool-changes.patch \ file://0016-Check-for-clang-before-checking-gcc-version.patch \ + file://0017-gas-improve-reproducibility-for-stabs-debugging-data.patch \ " S = "${WORKDIR}/git" diff --git a/meta/recipes-devtools/binutils/binutils/0017-gas-improve-reproducibility-for-stabs-debugging-data.patch b/meta/recipes-devtools/binutils/binutils/0017-gas-improve-reproducibility-for-stabs-debugging-data.patch new file mode 100644 index 0000000..42e0c1c --- /dev/null +++ b/meta/recipes-devtools/binutils/binutils/0017-gas-improve-reproducibility-for-stabs-debugging-data.patch @@ -0,0 +1,35 @@ +From aa6586e80fc6fcd739aa959a71e4cf064cdef072 Mon Sep 17 00:00:00 2001 +From: Denys Zagorui <[email protected]> +Date: Mon, 9 Nov 2020 15:39:10 +0000 +Subject: [PATCH] gas: improve reproducibility for stabs debugging data format + + * config/obj-elf (obj_elf_init_stab_section): Improve + reproducibility for stabs debugging data format + +Upstream-Status: Backport [https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=0541201782c006c09d029d18a45c6e743cfea906] +--- + gas/config/obj-elf.c | 3 ++- + 1 file changed, 2 insertions(+), 1 deletion(-) + +diff --git a/gas/config/obj-elf.c b/gas/config/obj-elf.c +index de22b5a1da..2025df8542 100644 +--- a/gas/config/obj-elf.c ++++ b/gas/config/obj-elf.c +@@ -2374,12 +2374,13 @@ obj_elf_init_stab_section (segT seg) + p = frag_more (12); + /* Zero it out. */ + memset (p, 0, 12); +- file = as_where (NULL); ++ file = remap_debug_filename (as_where (NULL)); + stabstr_name = concat (segment_name (seg), "str", (char *) NULL); + stroff = get_stab_string_offset (file, stabstr_name, TRUE); + know (stroff == 1 || (stroff == 0 && file[0] == '\0')); + md_number_to_chars (p, stroff, 4); + seg_info (seg)->stabu.p = p; ++ xfree ((char *) file); + } + + #endif +-- +2.20.1 + -- 2.7.4
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