Performing C SOURCE FILE Test HAVE_NOT_C_BUG_LOOP_VECTORIZE failed with the following output:
Change Dir: /backup-storage/percona/percona-xtrabackup-build/CMakeFiles/CMakeTmp

Run Build Command:/opt/rh/devtoolset-7/root/usr/bin/gmake "cmTryCompileExec570214177/fast"
/opt/rh/devtoolset-7/root/usr/bin/gmake -f CMakeFiles/cmTryCompileExec570214177.dir/build.make CMakeFiles/cmTryCompileExec570214177.dir/build
gmake[1]: Entering directory '/backup-storage/percona/percona-xtrabackup-build/CMakeFiles/CMakeTmp'
/usr/bin/cmake -E cmake_progress_report /backup-storage/percona/percona-xtrabackup-build/CMakeFiles/CMakeTmp/CMakeFiles 1
Building C object CMakeFiles/cmTryCompileExec570214177.dir/src.c.o
/opt/rh/devtoolset-7/root/usr/bin/gcc   -DHAVE_NOT_C_BUG_LOOP_VECTORIZE  -O3 -fPIC   -o CMakeFiles/cmTryCompileExec570214177.dir/src.c.o   -c /backup-storage/percona/percona-xtrabackup-build/CMakeFiles/CMakeTmp/src.c
Linking C executable cmTryCompileExec570214177
/usr/bin/cmake -E cmake_link_script CMakeFiles/cmTryCompileExec570214177.dir/link.txt --verbose=1
/opt/rh/devtoolset-7/root/usr/bin/gcc   -DHAVE_NOT_C_BUG_LOOP_VECTORIZE  -O3 -fPIC    CMakeFiles/cmTryCompileExec570214177.dir/src.c.o  -o cmTryCompileExec570214177 -rdynamic 
gmake[1]: Leaving directory '/backup-storage/percona/percona-xtrabackup-build/CMakeFiles/CMakeTmp'

Return value: FAILED_TO_RUN
Source file was:

inline void g(unsigned size, unsigned x[], unsigned y[])
{
  unsigned i;
  for (i = 0; i < size; i++)
  {
    x[i] |= y[i];
  }
  for (i = 0; i < size; i++)
  {
    y[i] = 0;
  }
}

struct A
{
  long a; // Make struct A 8 byte aligned
  int b;  // Make x[] not 8 byte aligned
  unsigned x[6];
  unsigned y[6];
};

void f(struct A* a)
{
  g(6, a->x, a->y);
}

int
main()
{
  struct A a;
  f(&a);
  return 0;
}

Performing C SOURCE FILE Test HAVE_NOT_C_BUG_LOOP_VECTORIZE_WORKAROUND failed with the following output:
Change Dir: /backup-storage/percona/percona-xtrabackup-build/CMakeFiles/CMakeTmp

Run Build Command:/opt/rh/devtoolset-7/root/usr/bin/gmake "cmTryCompileExec4130235354/fast"
/opt/rh/devtoolset-7/root/usr/bin/gmake -f CMakeFiles/cmTryCompileExec4130235354.dir/build.make CMakeFiles/cmTryCompileExec4130235354.dir/build
gmake[1]: Entering directory '/backup-storage/percona/percona-xtrabackup-build/CMakeFiles/CMakeTmp'
/usr/bin/cmake -E cmake_progress_report /backup-storage/percona/percona-xtrabackup-build/CMakeFiles/CMakeTmp/CMakeFiles 1
Building C object CMakeFiles/cmTryCompileExec4130235354.dir/src.c.o
/opt/rh/devtoolset-7/root/usr/bin/gcc   -DHAVE_NOT_C_BUG_LOOP_VECTORIZE_WORKAROUND  -O3 -fPIC -fvect-cost-model=cheap -fno-tree-loop-distribute-patterns -fno-tree-loop-vectorize   -o CMakeFiles/cmTryCompileExec4130235354.dir/src.c.o   -c /backup-storage/percona/percona-xtrabackup-build/CMakeFiles/CMakeTmp/src.c
Linking C executable cmTryCompileExec4130235354
/usr/bin/cmake -E cmake_link_script CMakeFiles/cmTryCompileExec4130235354.dir/link.txt --verbose=1
/opt/rh/devtoolset-7/root/usr/bin/gcc   -DHAVE_NOT_C_BUG_LOOP_VECTORIZE_WORKAROUND  -O3 -fPIC -fvect-cost-model=cheap -fno-tree-loop-distribute-patterns -fno-tree-loop-vectorize    CMakeFiles/cmTryCompileExec4130235354.dir/src.c.o  -o cmTryCompileExec4130235354 -rdynamic 
gmake[1]: Leaving directory '/backup-storage/percona/percona-xtrabackup-build/CMakeFiles/CMakeTmp'

Return value: FAILED_TO_RUN
Source file was:

inline void g(unsigned size, unsigned x[], unsigned y[])
{
  unsigned i;
  for (i = 0; i < size; i++)
  {
    x[i] |= y[i];
  }
  for (i = 0; i < size; i++)
  {
    y[i] = 0;
  }
}

struct A
{
  long a; // Make struct A 8 byte aligned
  int b;  // Make x[] not 8 byte aligned
  unsigned x[6];
  unsigned y[6];
};

void f(struct A* a)
{
  g(6, a->x, a->y);
}

int
main()
{
  struct A a;
  f(&a);
  return 0;
}