I have a lot of compilation flags that configure my program for different customers.
For instance: MODE_A_1, MODE_A_2, MODE_B_1, ... MODE_AB_54, ...
I would really like some preprocessor trick that would allow me to to such pseudo code:
#ifdef MODE_A_.*
Instead of having to type every MODE_A_.. occurrences:
#if defined(MODE_A_1) && defined(MODE_A_2) && ...
It would be even cooler if regexes could be applied.
Instead of going by the macro name, why not make the macro name a bit pattern denoting features. For example
#define FEAT_VCORNERS 0x01
#define FEAT_VPANEL 0x02
#define FEAT_DOOR_FULL_PANEL 0x04
OK so it limits you to 32 individual features - that is not many but it may be enough
Then for each customer you define what features they have. It doesn't matter if the pattern is repeated
#define CUST_A (FEAT_VCORNERS)
#define CUST_B (FEAT_VCORNERS)
#define CUST_C (FEAT_VPANEL | FEAT_DOOR_FULL_PANEL)
#define CUST_D (FEAT_VCORNERS | FEAT_VPANEL)
In the build input you could define -DCUST=CUST_D. In the code, you just need to test
#if CUST & FEAT_VCORNERS
...
#endif
I have a lot of compilation flags that configure my program for different customers. For instance:
MODE_A_1,MODE_A_2,MODE_B_1, ...MODE_AB_54, ...
But "MODE_A_1" is not a customer. You're confusing two completely different things at a very basic level.
If you want a list of features you can enable/disable independently for different customers, use something like
#if defined(CUSTOMER_GUILLAUME)
#define ENABLE_FEATURE_A
#define ENABLE_FEATURE_1
#elif defined(CUSTOMER_USELESS)
#define ENABLE_FEATURE_B
#define ENABLE_FEATURE_2
// ...
#endif
Then instead of
#if defined(MODE_A_1) && defined(MODE_A_2) && ...
you just use
#if defined(ENABLE_FEATURE_A)
Note that I'm just using on/off feature flags. You can set them to say integer version numbers if you need finer control such as #if (FEATURE_C_VERSION > 123) ...