It seems on a program I've inherited we can pass in make variables that are numbers but I'd like to pass in a string now. When they are passed in as numbers it is as the following:
CFLAGS += -DBUILD_NUMBER=$(BUILD_NUMBER)
and i can access it as an int like so:
fprintf(stderr, "\n%s v%d.%d.%d.%d\n", APPNAME, MAJOR_VERSION, MINOR_VERSION, PATCH_VERSION, BUILD_NUMBER, MYBRANCH);
but I do not seem to be achieving the same with a string.
CFLAGS += -DMYBRANCH=$(BRANCH)
fprintf(stderr, "\n%s v%d.%d.%d.%d.%s\n", APPNAME, MAJOR_VERSION, MINOR_VERSION, PATCH_VERSION, BUILD_NUMBER, MYBRANCH);
I get this error with the above:
main.cpp: In function ‘int args_parse_cmd_line(int, char**)’:
<command-line>:0:10: error: ‘FIL’ was not declared in this scope
main.cpp:72:114: note: in expansion of macro ‘MYBRANCH’
%s\n", APPNAME, MAJOR_VERSION, MINOR_VERSION, PATCH_VERSION, BUILD_NUMBER, MYBRANCH);
^~~~~~~~
Can someone give me a tip on what I'm doing wrong? "FIL-1234" is the example of our branch name that I'm trying to add to our build meta data for tractability.
This preprocessor trick should work
#define xstr(s) str(s)
#define str(s) #s
fprintf(stderr, "\n%s v%d.%d.%d.%d.%s\n", APPNAME, MAJOR_VERSION, MINOR_VERSION, PATCH_VERSION, BUILD_NUMBER, xstr(MYBRANCH));
It's clear from your error that MYBRANCH is being expanded into FIL-1234 when, not unreasonably, the compiler looks for a variable FIL. You need to turn the macro expansion into a string literal and the code above should do that. Although I haven't tested anything.
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