https://issues.dlang.org/show_bug.cgi?id=15531
Issue ID: 15531
Summary: dmd.conf linker flags should be prepended instead of
appended to subsequent linker flags
Product: D
Version: D2
Hardware: x86
OS: Mac OS X
Status: NEW
Severity: critical
Priority: P1
Component: dmd
Assignee: [email protected]
Reporter: [email protected]
I ran into this issue several times:
path/to/dmd some_d_flags some_linker_flags
Undefined symbols for architecture x86_64:
"_D6object9Throwable7messageMxFZAxa", referenced from [...]
which can be hard to debug why.
it works if I add:
path/to/dmd some_d_flags -L-Lfoo some_linker_flags
where foo=$dirname path/to/dmd
but this is harder to use and not DRY
The issue at hand is some_linker_flags (here containing
-L-L/path/to/homebrew/lib/) may overwrite the library path for phobos libs, eg
pointing to an older version of them compared to the one from path/to/dmd, and
the flags from path/to/dmd.conf are not taken into account.
Things would work if linker flags in dmd.conf (or from $DMD_FLAGS) were
prepended (instead of appended) to subsequent linker flags when dmd calls the
system linker.
If i want to indeed overwrite the dmd.conf flags, I can always call:
DMD_FLAGS="" path/to/dmd some_d_flags some_linker_flags
so we're loosing nothing.
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