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Subject[PATCH 14/19] Kbuild, lto: Handle basic LTO in modpost
Date
From: Andi Kleen <ak@linux.intel.com>

- Don't warn about LTO marker symbols. modpost runs before
the linker, so the module is not necessarily LTOed yet.
- Don't complain about .gnu.lto* sections

Signed-off-by: Andi Kleen <ak@linux.intel.com>
---
scripts/mod/modpost.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index f91dd45..63804a1 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -623,7 +623,10 @@ static void handle_modversions(struct module *mod, struct elf_info *info,

switch (sym->st_shndx) {
case SHN_COMMON:
- warn("\"%s\" [%s] is COMMON symbol\n", symname, mod->name);
+ if (!strncmp(symname, "__gnu_lto_", sizeof("__gnu_lto_")-1)) {
+ /* Should warn here, but modpost runs before the linker */
+ } else
+ warn("\"%s\" [%s] is COMMON symbol\n", symname, mod->name);
break;
case SHN_UNDEF:
/* undefined symbol */
@@ -849,6 +852,7 @@ static const char *section_white_list[] =
".xt.lit", /* xtensa */
".arcextmap*", /* arc */
".gnu.linkonce.arcext*", /* arc : modules */
+ ".gnu.lto*",
NULL
};

--
1.8.5.2


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