And streamline implicit -singleobj with DMD, also enforcing it when
compiling a *single* module *and* specifying the -of name.
[-makedeps currently depends on -singleobj.]
Incl. making sure `-cov=N ... -cov[=ctfe]` doesn't reset the required
percentage to 0.
Use a dummy *bool* option for a better help output (displaying `--cov`,
not `--cov=<value>`).
Fixes#3535 and an issue for ldmd2 wrt. unquoted args containing spaces
in response files for ldc2 (uncovered during manual tests). Also create
the temporary response files in the temp directory, not in the current
working dir.
And use the wide API for pure is-env-variable-set checks too, as the
first call to a narrow env API function would lead to the C runtime
preparing and maintaining both narrow and wide environments.
only)
This makes _d_wrun_main (cherry-picked from dlang/druntime#2701) use the
provided args directly instead of the process's real arguments (on
Windows) - if the host D compiler supports it.
E.g., this is required when passing --DRT-* options from a response file
to _d_wrun_main.
As a major change, the encoding of the Windows cmdline arguments is
switched from the current codepage to UTF-8.
Note that the MinGW-based libs currently only provide narrow CRT entry
points.
Only display the appropriate usage help (and then fail) if invoked
without any explicit cmdline options. Otherwise emit an error about
missing source files and fail immediately, without displaying the usage
help.
Besides making LDC and LDMD behave identically in this regard, it makes
just more sense IMO (when forgetting to specify a file, LDC previously
just printed the cmdline help without any error message).
It also makes `ldmd2 -transition=?` and `ldmd2 -preview=help` etc. print
the expected help without LDMD special cases.
* druntime: Adapt test/shared to vanished osmodel.mak
* LDMD: Accept multiple `-fPIC`. It translates to
`-relocation-model=pic`; that option is provided by LLVM and only
allowed once in the command line.
That issue is new for 2.076, as druntime's test/common.mak defaults to
PIC now.
