[Bug c/81156] New: GCC fails to compile a formula with tgmath.h

[equilibrium556 at gmx dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81156

            Bug ID: 81156
           Summary: GCC fails to compile a formula with tgmath.h
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: equilibrium556 at gmx dot de
  Target Milestone: ---

Created attachment 41603
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=41603&action=edit
C file that fails to compile with GCC

Hey, I ran into some problems compiling code that contained a specific formula.
I am using the type generic tgmath.h header because I am switching between
float and double for performance testing reasons.

If I include the tgmath.h header, the code doesn't compile, GCC ends up filling
up all my RAM and doesn't succeed to compile the file. It compiles using the
math.h header without a problem.

Here's the code in question (also in the attachment):
/* memory_leak.c */
#include <stdio.h>
#include <stdlib.h>
#include <tgmath.h>

#ifdef TEST_SP
typedef float test_float;
#else
typedef double test_float;
#endif

int main(int argc, char *argv[]) {
        int b = -1;
        test_float a, c, d, e, f, g, h, i;
        a = c = d = e = f = g = h = i = 1;

        a = 2*b/abs(b)*sqrt(pow(sqrt(pow(c, 2) - pow(d, 2)) -
e*f*cos(g)*cos(h)/abs(b)*(i - 1), 2) + pow(d/2, 2));

        return 0;
}
/* END */

Compile with:
gcc -o memory_leak -DTEST_SP -std=c99 memory_leak.c -lm

It ends up eating all the memory there is.
Doesn't work on current GCC 7.1.1 on Arch nor on an RHEL6 distro with GCC
4.4.7.
Works with GCC 5.3 in Cygwin.
Clang and ICC compile without problems as well on Linux.