Bug 22034 – The phobos2 is not linked by default with -betterc

Here is a simple code for test: ``` import std.ascii : isLower; extern(C) void main() { bool r = isLower('A'); } ``` To run: ``` dmd app.d -betterC ``` The error message: ``` app.o: In function `main': source/app.d:(.text.main[main]+0xa): undefined reference to `_D3std5ascii7isLowerFNaNbNiNfwZb' collect2: error: ld returned 1 exit status Error: linker exited with status 1 ``` The compiler is DMD v2.097.0.

same compiler, non-betterC cc: cc bcascii.o -o /tmp/dmd_run2D9Hdd -m64 -Xlinker --export-dynamic -L/home/mipri/dmd2/linux/bin64/../lib64 -Xlinker -Bstatic -lphobos2 -Xlinker -Bdynamic -lpthread -lm -lrt -ldl -betterC cc (with same error): cc bcascii.o -o /tmp/dmd_run3XoXBx -m64 -Xlinker --export-dynamic -L/home/mipri/dmd2/linux/bin64/../lib64 -lpthread -lm -lrt -ldl -betterC -L-lphobos2 (build successful) cc bcascii.o -o /tmp/dmd_runbkX3TQ -m64 -Xlinker --export-dynamic -lphobos2 -L/home/mipri/dmd2/linux/bin64/../lib64 -lpthread -lm -lrt -ldl This behavior's also seen with a freshly built devel dmd.

In fact, the -betterc does not work properly since DMD 2.096.0. What happened since then?

(In reply to mipri from comment #1) > same compiler, non-betterC cc: > > cc bcascii.o -o /tmp/dmd_run2D9Hdd -m64 -Xlinker --export-dynamic > -L/home/mipri/dmd2/linux/bin64/../lib64 -Xlinker -Bstatic -lphobos2 -Xlinker > -Bdynamic -lpthread -lm -lrt -ldl > > -betterC cc (with same error): > > cc bcascii.o -o /tmp/dmd_run3XoXBx -m64 -Xlinker --export-dynamic > -L/home/mipri/dmd2/linux/bin64/../lib64 -lpthread -lm -lrt -ldl > > -betterC -L-lphobos2 (build successful) > > cc bcascii.o -o /tmp/dmd_runbkX3TQ -m64 -Xlinker --export-dynamic -lphobos2 > -L/home/mipri/dmd2/linux/bin64/../lib64 -lpthread -lm -lrt -ldl > > This behavior's also seen with a freshly built devel dmd. You are right. The phobos2 is not linked by default for -betterc.

Not linking Phobos is a feature, not a bug. Linking Phobos means linking in the D runtime, as Phobos depends on it. If you want this to work, use standard C function like `islower` (3).