add #define when a specific flag is used

Question

I want to add a #define FOO code in an header file with autotools when I used a specific flag.

The project I have creates a static library using header to use inline functions for example. If I use the -D option, It will be used at the creation time but I'll have to add it at each compilation using this library which is what I want to avoid.

How can I perform this?

"Since it's on a header in order to create a static library, I cannot use the -D option." This sentence doesn't parse. Can you explain in more detail why you can't use -D? — n. m. could be an AI, May 09 '16 at 09:18
@n.m. The project I have creates a static library using header to use inline functions for example. If I use the -D option, It will be used at the creation time but I'll have to add it at each compilation using this library which is what I want to avoid. — Romain Picot, May 09 '16 at 09:22

score 0 · Answer 1 · edited May 23 '17 at 12:16

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I think your best bet is to generate the required header file from the pre-existing file. The following shell command would do the trick:

(echo "#define FOO" ; cat myheader_pregen.hpp) > myheader.hpp

You can incorporate the above as a script into autotools with this

edited May 23 '17 at 12:16

Community

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answered May 09 '16 at 08:55

Smeeheey

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Doesn't autoconf generate config.h for you? It seems to be the place to stick such #defines in. – n. m. could be an AI May 09 '16 at 09:40

add #define when a specific flag is used

1 Answers1