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Top Forums Programming Conditional Compilation based on Environmental Variable in Unix Post 302314115 by BrighterLater on Thursday 7th of May 2009 11:45:54 AM
Old 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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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)
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