Bug 9142 – Segmentation fault (DMD only) when calling some external functions twice in one expression

When I call some GSL functions from a D program this causes segmentation fault. This happens: at least with gsl_sf_sin and gsl_sf_cos; only if compiled with DMD (no error with GDC); only if the functions a called twice in the same arithmetic expression; not for all argument values (1e-4 is OK, 2e-4 is not). Order of operands matters if "bad" and "good" argument values are combined in the same expression. Wrapping of functions does not help. Code: ---------- import std.stdio; extern(C) double gsl_sf_sin(double x); void main() { writeln(gsl_sf_sin(2e-4) + gsl_sf_sin(1e-4)); double a = gsl_sf_sin(1e-4); writeln(a + gsl_sf_sin(2e-4)); writeln(gsl_sf_sin(1e-4) + gsl_sf_sin(2e-4)); //ERROR } ---------- With DMD v2.060: dmd test.d -L-lgsl -L-lblas 0.0003 0.0003 Segmentation fault With GDC-4.6: gdc-4.6 test.d -lgsl -lblas 0.0003 0.0003 0.0003

I cannot reproduce this with the current DMD.

The latest version of DMD from GitHub works well. Thank you!