Re: #define usage in Sequencer

[Mark Rivers via Tech-talk <tech-talk at aps.anl.gov>]

I believe I understand the problem.  This is from the sequencer manual:

Depending on the application, it might be useful to pre-process the SNL source with a C pre-processor (cpp). Using the C pre-processor allows you to include other SNL files, define macros, and perform conditional compilation. snc supports this by interpreting cpp-generated line markers, so that error and warning messages refer to the line numbers in the un-pre-processed SNL source.

The build rules that the sequencer adds to the EPICS build system are such that files with the extension .st are preprocessed, while those with the extension .stt are not.

So if you name your file .stt then the C pre-processor is not run.  But #define is handled by the C pre-processor.  So you need to name your file .st not .stt.

I tested this on my system, and I get the same error as you if the file is named .stt, but it works fine if it is named .st.

Mark

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From: Tech-talk <tech-talk-bounces at aps.anl.gov> on behalf of Hyung Jin Kim via Tech-talk <tech-talk at aps.anl.gov>
Sent: Sunday, April 2, 2023 7:25 AM
To: tech-talk at aps.anl.gov <tech-talk at aps.anl.gov>
Subject: #define usage in Sequencer

 

Dear All,

I tried to set a size of array using predefined value in sequencer code as follows:

program sncTest

#define A_SIZE 3

double test_array[A_SIZE];
assign test_array to {"{S}:r1", "{S}:r2", "{S}:r3"};
monitor test_array;

....

However, it gives an error when it is compiled. #define is not allowed in sequencer. An used sequencer version is 2-2-6.

../sncTest.stt:3: lexical error: invalid character
../sncTest.stt:3: syntax error near token ''
../sncTest.stt:3: parser giving up

Thanks,