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clang (from LLVM) can be used to compile against dietlibc, but it can
not be used to compile dietlibc itself. The reason is that dietlibc
uses gas (the GNU assembler, part of binutils) features in the assembly
parts that are not yet supported by clang.
The build process compensates by passing -fno-integrated-as to clang,
but that makes compilation with clang much slower than compilation with
gcc.
Still, the end result appears to work.
Note that the resulting binaries are larger. Here is the diet binary
for comparison. Compiled with gcc 5.2:
-rwxr-xr-x 1 root root 8176 Jul 4 20:43 diet
Compiled with clang 3.6.2:
-rwxr-xr-x 1 leitner users 8560 Jul 29 14:49 bin-x86_64/diet-i
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