[Issue 20377] New: extern(C) void main(string[] args) has invalid 'args'
d-bugmail at puremagic.com
d-bugmail at puremagic.com
Sun Nov 10 04:27:10 UTC 2019
https://issues.dlang.org/show_bug.cgi?id=20377
Issue ID: 20377
Summary: extern(C) void main(string[] args) has invalid 'args'
Product: D
Version: D2
Hardware: x86_64
OS: Linux
Status: NEW
Severity: enhancement
Priority: P1
Component: dmd
Assignee: nobody at puremagic.com
Reporter: mipri at minimaltype.com
The following complete program succeed when run with no arguments.
What it should do is fail on the second assert.
extern(C) void main(string[] args) {
import core.stdc.stdio: printf;
assert(args.length == 1);
assert(args[0].ptr == null);
}
When 'extern(C)' is removed, this code fails as args[0] contains the
path used to invoke the program, as provided by the OS.
I noticed this when trying to write an extremely simple C program in D,
with -betterC, where I spent more than 20 minutes being perplexed by
'impossible' NULL dereferences. The behavior comes with the extern(C)
however, and doesn't require a -betterC flag. This behavior is observed
with LDC 1.15.0 and DMD64 D Compiler v2.086.1, and with the nightly DMD
build of v2.089.0-rc.1-master-2bbd37b
extern(C) void main(int argc, char **argv) works fine, but I argue if
string[] args isn't supported, compilation should fail with an error
instead of providing the current behavior.
--
More information about the Digitalmars-d-bugs
mailing list