cpp conversion: fix One-Definition-Rule violations

Defining struct pj_opaque with different definitions is a violation
of the C++ One-Definition-Rule. When using link-time optimizations, this
could break badly.
The solution adopted here is to wrap those structures into a C++
anonymous namespace so they are considered different

1 files changed, 2 insertions, 0 deletions

diff --git a/src/PJ_lsat.cpp b/src/PJ_lsat.cpp
index e3e7e026..ba829d42 100644
--- a/src/PJ_lsat.cpp
+++ b/src/PJ_lsat.cpp
@@ -12,10 +12,12 @@ PROJ_HEAD(lsat, "Space oblique for LANDSAT")
 
 #define TOL 1e-7
 
+namespace { // anonymous namespace
 struct pj_opaque {
     double a2, a4, b, c1, c3;
     double q, t, u, w, p22, sa, ca, xj, rlm, rlm2;
 };
+} // anonymous namespace
 
 static void seraz0(double lam, double mult, PJ *P) {
     struct pj_opaque *Q = static_cast<struct pj_opaque*>(P->opaque);