Is there a -Dmacro like option for D compilers?
Is there a way I can define a manifest constant from the compiler command-line, like the -Dmacro option for C compilers?
Re: std.net.curl.HTTP: can't download more than 3.6K
Nevermind, it was my fault. I fixed my problem by appending the received buffer to my data buffer instead of overwriting my data buffer each time.
Re: Difference between using `import` with/without the colon
On Sunday, 19 March 2023 at 08:47:32 UTC, Basile B. wrote: On Sunday, 19 March 2023 at 07:20:17 UTC, Jeremy wrote: [...] The colon-form, aka "selective import" has for effect 1. to create a local alias so this can indeed speedup symbol lookups in the sense that search will succeed before looking in the scope of the imports. 2. to make non-selected symbols, i.e not listed in the colon right hand side, in the import not available. Note that using both makes no sense, but I guess you did that to express more clearly what you meant. Ah, that makes sense. Thank you!
Difference between using `import` with/without the colon
Hello, is there any difference at all between the following lines, as an example: ```d import std.regex; import std.regex : matchFirst; ``` What technical differences does it make (except for having the identifier available), using the colon? Does it make any speed/optimization changes or am I better off just importing the whole module?
std.net.curl.HTTP: can't download more than 3.6K
Hello, I'm new to D and the `std.net.curl` library. I'm using the `HTTP` struct because I need to set headers for an API, and most of the time, I can only download 3.6 kilobytes at a time. Would this be a problem with the library not following redirects or something else? I'm not really sure what it could be, so could someone help me with this?
Re: #define-like behavior
On Tuesday, 14 March 2023 at 06:20:29 UTC, Mike Parker wrote: On Tuesday, 14 March 2023 at 05:47:35 UTC, Jeremy wrote: [...] Manifest constants in D have a similar effect as #defined values, e.g.: [...] Thanks a lot!
#define-like behavior
Hi, in C and C++ you can use #define to substitute a value in place of an identifier while preprocessing. If you initialize a new string and don't change its value after that, will the compiler substitute the string identifier with its value, like #define in C, or will it make a string in memory and refer to that?
Re: Directly compiling a D program with other libraries
That's a linker error, meaning the missing symbol isn't available to link into the executable. You need to compile the source of all the libraries you use and make sure the resultant binaries are available for the linker to link into the executable. The -I switch you've passed tells the compiler where to find imported modules. The compiler needs parse them to know which symbols are available for you to use when it's compiling your code. (The current working directory is the default anyway, so you don't need to pass `-I.` for that.) By default, the compiler does not compile imported modules. If you add `-i` to the command line, then it will compile all of the modules you import (as long as they're in the `-I` path), excluding the DRuntime and Phobos modules. It will then also pass all of the compiled object files to the linker, so then your linker error should go away. Using `-i` solved my problem, thank you very much! However, when you choose not to use dub, you need to also ensure that you are accounting for any special compiler flags the libraries you use may require (for example, specific `-version` values). If they're configured to compile as static or shared libraries, it may be easier just to store the source for each of them outside of your project's source tree, use dub to build each of them, and then pass the compiled libraries to the compiler when you build your program. In that case, you wouldn't use `-i`. Just make sure that `-I` is correctly configured in that case. Okay, thanks.
Directly compiling a D program with other libraries
Hello, I am new to this forum and to D. I am trying to compile a basic D program with libraries (`requests` which requires `cachetools` and `automem`) without using dub. I have never used dub before, only a compiler. The folders containing the libraries are in the same folder as main.d, the file I am trying to compile, and the command I am using to compile is `ldc2 -I. main.d`. When I compile my program, I just get linker errors such as: ``` /usr/lib/gcc/x86_64-pc-linux-gnu/12/../../../../x86_64-pc-linux-gnu/bin/ld: main.o: in function `_Dmain': main.d:(.text._Dmain+0x2f): undefined reference to `_D8requests10getContentFNcAyaZSQBd7streams__T6BufferThZQk' ``` Does anyone have any advice on how to solve my problem?
