Substitute command output inside @[Include(flags: …)] ? about crystal_lib

[RX14]

This works since ldflags is passed directly to the shell. If you want to interpolate shell output into @[Include] you'll want to use macros

[shdown]

Could you please give an example of how to do this? Seems to be impossible.

[RX14]

@[Include(..., flags: "{{`echo -Dfoo`}}")

should work

[shdown]

No, it does not: running crystal_lib on

@[Include(
    "llvm-c/Core.h",
    "llvm-c/BitReader.h",
    flags: "{{`llvm-config-7 --cflags`}}",
    prefix: %w(LLVM_ LLVM)
)]
lib LibLLVM_C
end

results in

error: unsupported option '--cflags`}}'
warning: {{`llvm-config-7: 'linker' input unused [-Wunused-command-line-argument]
input.c:1:10: fatal error: 'llvm-c/Core.h' file not found
lib LibLLVM_C
end

[RX14]

yeah, seems like this doesn't work :(