This is my script:

====
HOST_DMD=dmd
MODEL=64
cd dmd
make -fposix.mak MODEL=64 clean
make -fposix.mak ENABLE_RELEASE=1 MODEL=64 DMD=../dmd/src/dmd -j 5
cd ../druntime
make -fposix.mak MODEL=64 clean
make -fposix.mak MODEL=64 DMD=../dmd/src/dmd -j 5
cd ../phobos
make -fposix.mak MODEL=64 clean
make -fposix.mak MODEL=64 DMD=../dmd/src/dmd -j 5

cd ..
cp dmd/generated/linux/release/64/dmd bin-master/
cp phobos/generated/linux/release/64/libphobos2.a bin-master/libs/
====

When i compile a simple module with a main function and std.stdio as import i get:

====
/tmp/temp_7F12E3A4FF10.o : Dans la fonction « @safe void std.format.formatUnsigned!(std.stdio.File.LockingTextWriter, ulong, char).formatUnsigned(std.stdio.File.LockingTextWriter, ulong, ref const(std.format.FormatSpec!(char).FormatSpec), uint, bool) » :
/tmp/temp_7F12E3A4FF10.d:(.text.@safe void std.format.formatUnsigned!(std.stdio.File.LockingTextWriter, ulong, char).formatUnsigned(std.stdio.File.LockingTextWriter, ulong, ref const(std.format.FormatSpec!(char).FormatSpec), uint, bool)[@safe void std.format.formatUnsigned!(std.stdio.File.LockingTextWriter, ulong, char).formatUnsigned(std.stdio.File.LockingTextWriter, ulong, ref const(std.format.FormatSpec!(char).FormatSpec), uint, bool)]+0x312) : référence indéfinie vers « const(pure nothrow @property @nogc @safe bool function()) std.format.FormatSpec!(char).FormatSpec.flSeparator »
/tmp/temp_7F12E3A4FF10.d:(.text.@safe void std.format.formatUnsigned!(std.stdio.File.LockingTextWriter, ulong, char).formatUnsigned(std.stdio.File.LockingTextWriter, ulong, ref const(std.format.FormatSpec!(char).FormatSpec), uint, bool)[@safe void std.format.formatUnsigned!(std.stdio.File.LockingTextWriter, ulong, char).formatUnsigned(std.stdio.File.LockingTextWriter, ulong, ref const(std.format.FormatSpec!(char).FormatSpec), uint, bool)]+0x436) : référence indéfinie vers « const(pure nothrow @property @nogc @safe bool function()) std.format.FormatSpec!(char).FormatSpec.flSeparator »
/tmp/temp_7F12E3A4FF10.o : Dans la fonction « pure @safe void std.format.formatUnsigned!(std.array.Appender!(immutable(char)[]).Appender, ulong, char).formatUnsigned(std.array.Appender!(immutable(char)[]).Appender, ulong, ref const(std.format.FormatSpec!(char).FormatSpec), uint, bool) » :
/tmp/temp_7F12E3A4FF10.d:(.text.pure @safe void std.format.formatUnsigned!(std.array.Appender!(immutable(char)[]).Appender, ulong, char).formatUnsigned(std.array.Appender!(immutable(char)[]).Appender, ulong, ref const(std.format.FormatSpec!(char).FormatSpec), uint, bool)[pure @safe void std.format.formatUnsigned!(std.array.Appender!(immutable(char)[]).Appender, ulong, char).formatUnsigned(std.array.Appender!(immutable(char)[]).Appender, ulong, ref const(std.format.FormatSpec!(char).FormatSpec), uint, bool)]+0x316) : référence indéfinie vers « const(pure nothrow @property @nogc @safe bool function()) std.format.FormatSpec!(char).FormatSpec.flSeparator »
/tmp/temp_7F12E3A4FF10.d:(.text.pure @safe void std.format.formatUnsigned!(std.array.Appender!(immutable(char)[]).Appender, ulong, char).formatUnsigned(std.array.Appender!(immutable(char)[]).Appender, ulong, ref const(std.format.FormatSpec!(char).FormatSpec), uint, bool)[pure @safe void std.format.formatUnsigned!(std.array.Appender!(immutable(char)[]).Appender, ulong, char).formatUnsigned(std.array.Appender!(immutable(char)[]).Appender, ulong, ref const(std.format.FormatSpec!(char).FormatSpec), uint, bool)]+0x43a) : référence indéfinie vers « const(pure nothrow @property @nogc @safe bool function()) std.format.FormatSpec!(char).FormatSpec.flSeparator »
collect2: error: ld returned 1 exit status
Error: linker exited with status 1
====

But this used to work fine, this for months and months even recently i've cast a session where i build DMD master to show something about my IDE.

On Wednesday, 7 June 2017 at 09:50:41 UTC, Basile B. wrote:
> bla bla bla

Actually it's this code:

void main(string[] args)
{
    import std.stdio;
    import std.compiler;
    writeln(vendor);
}

that gives the error. I suspect a regression.

On Wednesday, 7 June 2017 at 09:55:24 UTC, Basile B. wrote:
> On Wednesday, 7 June 2017 at 09:50:41 UTC, Basile B. wrote:
>> bla bla bla
>
> Actually it's this code:
>
> void main(string[] args)
> {
>     import std.stdio;
>     import std.compiler;
>     writeln(vendor);
> }
>
> that gives the error. I suspect a regression.

Pass your way, you cannot help. Eventually you can verify that you're also affected.

https://issues.dlang.org/show_bug.cgi?id=17475