gcc-4.9/gcc/testsuite/gcc.dg/const-float128.c


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/* Test 'q' and 'Q' suffixes on __float128 type constants.  */
/* { dg-do compile { target ia64-*-* i?86-*-* x86_64-*-* } } */
/* { dg-options "" } */

__float128 a = 123.456789q;
__float128 b = 123.456789Q;