[Bug lto/56168] New: [4.8 Regression] GCC seems to disregard -fno-builtin when compiling with LTO

[d.g.gorbachev at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56168



             Bug #: 56168

           Summary: [4.8 Regression] GCC seems to disregard -fno-builtin

                    when compiling with LTO

    Classification: Unclassified

           Product: gcc

           Version: 4.8.0

            Status: UNCONFIRMED

          Severity: normal

          Priority: P3

         Component: lto

        AssignedTo: unassig...@gcc.gnu.org

        ReportedBy: d.g.gorbac...@gmail.com





cat > 1.c

extern int printf(const char *, ...);

extern double pow(double, double);



int main(int argc, char **argv)

{

  double d1 = (double) (argc + argv[0][0]);

  double d2 = pow(d1, 1.0 / 3.0);

  printf("%f %f\n", d1 * d1, d2);

  return 0;

}

^D

$ gcc -O -fno-builtin -ffast-math -fno-lto 1.c

/tmp/cc9Il6Md.o:1.c:function main: error: undefined reference to 'pow'

[...]

$ gcc -O -fno-builtin -ffast-math -flto 1.c

/tmp/ccfKmD30.ltrans0.ltrans.o:ccfKmD30.ltrans0.o:function main: error:

undefined reference to 'cbrt'

[...]



R191367 (20120916) - ok, r191654 (20120923) - bug.