[perl #99368] h2ph-generated code to avoid macro redefinitions doesn't work

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Hi,

h2ph generates code of the form

 unless(defined(&FOO)) {
     sub FOO () {42;}
 }

for a C macro like '#define FOO 42'.

The problem with that: 'sub' happens at compile time, 'unless' at runtime.
So the sub is unconditionally defined first, then the unless runs with
an empty body.

I've attached a git patch that should solve the problem.

• [perl #99368] h2ph-generated code to avoid macro redefinitions doesn't work by Father Chrysostomos via RT
• [perl #99368] h2ph-generated code to avoid macro redefinitions doesn't work by l . mai @ web . de