Re: How to set constant value to environment variable at compile time?
On Mon, 10 Dec 2018 17:58:32 +, aliak wrote:
> string parseConfig(string str) {
>string ret;
>foreach (line; str.split("\n")) {
> auto parts = line.split("=");
> ret ~= `string ` ~ parts[0] ~ ` = "` parts[2] `";`;
>}
>return ret;
> }
That works as long as none of the environment variable values contain a
double quote or a newline character.
Re: How to set constant value to environment variable at compile time?
On Monday, 10 December 2018 at 17:47:37 UTC, Neia Neutuladh wrote: On Mon, 10 Dec 2018 11:08:23 +, Narxa wrote: Hello, people! I would like to have a constant with the value of some environment variable that is defined at compile time. In your build script, echo the environment variable into a file. Then import() that file and use the value. I know I could possibly use 'gdc' to achieve that but I want to use the 'dmd' compiler. Defining variables like that is a language-level feature. gdc supports exactly the same options as dmd. It worked! Thank you very much!
Re: How to set constant value to environment variable at compile time?
On Monday, 10 December 2018 at 11:08:23 UTC, Narxa wrote:
Hello, people!
I would like to have a constant with the value of some
environment variable that is defined at compile time.
In FreePascal, it can be done by defining it in source as:
VALUE_OF_SOMETHING = {$I %SOMETHING%};
And I can call the compiler with (bash):
SOMETHING='Anything' export SOMETHING;
And it will automatically assign VALUE_OF_SOMETHING to
'Anything'.
In GCC C compiler, the solution I found was more complicated
but it worked.
I had to explicitly define the environment variable when
calling the compiler with:
gcc -DSOMETHING=\""Anything"\" -o
Now, I would like to do that with the 'dmd' compiler.
I know I could possibly use 'gdc' to achieve that but I want to
use the 'dmd' compiler.
Is it possible to do that such a thing or through source or any
other means?
Thank you!
I don't know if it's possible but one way to do it would be to
use the -J switch and give it a config file that has contents:
VAR1=Value1
VAR2=Value2
And then in source code:
immutable config = import("config");
mixin(parseConfig);
string parseConfig(string str) {
string ret;
foreach (line; str.split("\n")) {
auto parts = line.split("=");
ret ~= `string ` ~ parts[0] ~ ` = "` parts[2] `";`;
}
return ret;
}
You can also echo out the config file with bash or something
Cheers,
- Ali
Re: How to set constant value to environment variable at compile time?
On Mon, 10 Dec 2018 11:08:23 +, Narxa wrote: > Hello, people! > > I would like to have a constant with the value of some environment > variable that is defined at compile time. In your build script, echo the environment variable into a file. Then import() that file and use the value. > I know I could possibly use 'gdc' to achieve that but I want to use the > 'dmd' compiler. Defining variables like that is a language-level feature. gdc supports exactly the same options as dmd.
How to set constant value to environment variable at compile time?
Hello, people!
I would like to have a constant with the value of some
environment variable that is defined at compile time.
In FreePascal, it can be done by defining it in source as:
VALUE_OF_SOMETHING = {$I %SOMETHING%};
And I can call the compiler with (bash):
SOMETHING='Anything' export SOMETHING;
And it will automatically assign VALUE_OF_SOMETHING to 'Anything'.
In GCC C compiler, the solution I found was more complicated but
it worked.
I had to explicitly define the environment variable when calling
the compiler with:
gcc -DSOMETHING=\""Anything"\" -o
Now, I would like to do that with the 'dmd' compiler.
I know I could possibly use 'gdc' to achieve that but I want to
use the 'dmd' compiler.
Is it possible to do that such a thing or through source or any
other means?
Thank you!
