[Issue 20019] Symbol not found: _dyld_enumerate_tlv_storage on macOS 10.15

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20019

Andrei Alexandrescu <andrei at erdani.com> changed:

           What    |Removed                     |Added
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                 CC|                            |andrei at erdani.com

--- Comment #6 from Andrei Alexandrescu <andrei at erdani.com> ---
I seem to have gotten in an unsolvable situation with reinstalling due to (it
seems) this issue on an osx machine.

1. First I cleaned everything there is and then synced everything with git.

2. In the dmd directory I issued:

$ make -f posix.mak AUTO_BOOTSTRAP=1

To my surprise that did not actually build the compiler via bootstrapping, it
just installed a prebuilt binary 2.088.0. Why did we change that? Bootstrap
should bootstrap.

3. Then I tried in the same dmd directory the command:

$ make -f posix.mak

And the first line executed in the makefile was:

dmd -of../generated/build -g build.d

...which failed with:

Error: cannot find source code for runtime library file 'object.d'
       dmd might not be correctly installed. Run 'dmd -man' for installation
instructions.
       config file: /Users/andrei/bin/dmd.conf

A few questions.

A. Why doesn't "AUTO_BOOTSTRAP=1" bootstrap anymore?

B. Even if it doesn't go through all stages of bootstrapping, why doesn't it
leave a working installation behind? My /Users/andrei/bin/dmd.conf completely
messed that up. It should warn me about its existence or overwrite it leaving a
backup behind.

c. Why is the build process looking at /Users/andrei/bin/dmd.conf? It should be
self-contained, i.e. not assume there's any working installation and override
all possible user-defined flags and configuration files.

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