05-07-2009
Apologies for answering my own question but I think that this is probably a reasonable solution:
Suppose you have an "env var" MY_VERSN
export MY_VERSN=9
In the makefile you can access this as $$MY_VERSN
and add a complier flag
-DMYVER=$$MY_VERSN
Then in the C++ code you can put
#if MYVERSN == 9
iret = routine_A()
#else
iret = routine_B()
#endif
Sorry if I have taken up anyones time.
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LEARN ABOUT FREEBSD
hx509_env_lfind
hx509 enviroment functions(3) Heimdalx509library hx509 enviroment functions(3)
NAME
hx509 enviroment functions -
Functions
int hx509_env_add (hx509_context context, hx509_env *env, const char *key, const char *value)
int hx509_env_add_binding (hx509_context context, hx509_env *env, const char *key, hx509_env list)
const char * hx509_env_lfind (hx509_context context, hx509_env env, const char *key, size_t len)
const char * hx509_env_find (hx509_context context, hx509_env env, const char *key)
hx509_env hx509_env_find_binding (hx509_context context, hx509_env env, const char *key)
void hx509_env_free (hx509_env *env)
Detailed Description
Function Documentation
int hx509_env_add (hx509_context context, hx509_env * env, const char * key, const char * value)
Add a new key/value pair to the hx509_env.
Parameters:
context A hx509 context.
env enviroment to add the enviroment variable too.
key key to add
value value to add
Returns:
An hx509 error code, see hx509_get_error_string().
int hx509_env_add_binding (hx509_context context, hx509_env * env, const char * key, hx509_env list)
Add a new key/binding pair to the hx509_env.
Parameters:
context A hx509 context.
env enviroment to add the enviroment variable too.
key key to add
list binding list to add
Returns:
An hx509 error code, see hx509_get_error_string().
const char* hx509_env_find (hx509_context context, hx509_env env, const char * key)
Search the hx509_env for a key.
Parameters:
context A hx509 context.
env enviroment to add the enviroment variable too.
key key to search for.
Returns:
the value if the key is found, NULL otherwise.
hx509_env hx509_env_find_binding (hx509_context context, hx509_env env, const char * key)
Search the hx509_env for a binding.
Parameters:
context A hx509 context.
env enviroment to add the enviroment variable too.
key key to search for.
Returns:
the binding if the key is found, NULL if not found.
void hx509_env_free (hx509_env * env)
Free an hx509_env enviroment context.
Parameters:
env the enviroment to free.
const char* hx509_env_lfind (hx509_context context, hx509_env env, const char * key, size_t len)
Search the hx509_env for a length based key.
Parameters:
context A hx509 context.
env enviroment to add the enviroment variable too.
key key to search for.
len length of key.
Returns:
the value if the key is found, NULL otherwise.
Version 1.5.2 11 Jan 2012 hx509 enviroment functions(3)