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From: "trippels at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug ipa/64801] New: [5 Regression] kernel build failure due to ICF
Date: Mon, 26 Jan 2015 14:39:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64801

            Bug ID: 64801
           Summary: [5 Regression] kernel build failure due to ICF
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: ipa
          Assignee: unassigned at gcc dot gnu.org
          Reporter: trippels at gcc dot gnu.org
                CC: marxin at gcc dot gnu.org

Created attachment 34574
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34574&action=edit
unreduced testcase

Seen on x86_64 with kernel's defconfig.

...
  CC      init/version.o
  LD      init/built-in.o
drivers/built-in.o:psmouse-base.c:function psmouse_extensions: error: undefined
reference to 'fsp_detect'


-fno-ipa-icf "fixes" the issue.

markus@x4 tmp % cat psmouse-base.i
int a;
int
elantech_detect (void)
{
  return -38;
}
inline int
fsp_detect (void)
{
  return -38;
}
void
psmouse_extensions (void)
{
  int (*b)() = fsp_detect;
  a = b ();
}

markus@x4 tmp % gcc -c -O2 psmouse-base.i
markus@x4 tmp % nm psmouse-base.o| grep fsp_detect
                 U fsp_detect