[Issue 21038] New: Wrong codegen when calling wcslen

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21038

          Issue ID: 21038
           Summary: Wrong codegen when calling wcslen
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Severity: major
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: tim.dlang at t-online.de

The result of wcslen can be too low when compiling with dmd 2.093. Consider the
following two files:

//////////////////// testabcd.d ///////////////////
import core.stdc.stddef;
import core.stdc.stdio;
import core.stdc.wchar_;

const(wchar_t)* name = "abcd";

void test()
{
        size_t length = wcslen(name);
        printf("length: %zd\n", length);
        printf("data: \"");
        for(const(wchar_t)* s = name; *s; s++)
                printf("%c", *s);
        printf("\"\n");
}
///////////////////////////////////////////////////

//////////////////// testxyzw.d ///////////////////
import testabcd;

void main()
{
        test();
}
///////////////////////////////////////////////////

Running it results in the following output:
length: 3
data: "abcd"

The correct length would be 4. When compiling with ldc it works as expected.

The filenames are important. When testxyzw.d is renamed to testx.d it produces
the expected output.

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