I have a question about function `export_library`, Here is my target
```
tgt = "llvm -mtriple=riscv64-unknown-linux-gnu -mcpu=generic-rv64
-mfloat-abi=hard"
```
and `export_library` use:
```
specialized =
cc.cross_compiler("soft/riscv/new_install/bin/riscv64-unknown-linux-gnu-g++",
["-mabi=lp64d"])
fadd.export_library(path, specialized)
```
and then I get the error
```
soft/riscv/new_install/lib/gcc/riscv64-unknown-linux-gnu/10.1.0/../../../../riscv64-unknown-linux-gnu/bin/ld:
lib/riscv.o: can't link soft-float modules with double-float modules
Command line: soft/riscv/new_install/bin/riscv64-unknown-linux-gnu-g++ -shared
-fPIC -o lib/riscv.so lib/riscv.o
```
my cross compiler's configure is
```
/soft/riscv/new_install/libexec/gcc/riscv64-unknown-linux-gnu/10.1.0/lto-wrapper
Target: riscv64-unknown-linux-gnu
Configured with: soft/riscv/riscv-gnu-toolchain/riscv-gcc/configure
--target=riscv64-unknown-linux-gnu --prefix=soft/riscv/new_install
--with-sysroot=soft/riscv/new_install/sysroot --with-system-zlib
--enable-shared --enable-tls --enable-languages=c,c++,fortran
--disable-libmudflap --disable-libssp --disable-libquadmath
--disable-libsanitizer --disable-nls --disable-bootstrap --src=.././riscv-gcc
--enable-multilib --with-abi=lp64d --with-arch=rv64imafdc --with-tune=rocket
'CFLAGS_FOR_TARGET=-O2 -mcmodel=medlow' 'CXXFLAGS_FOR_TARGET=-O2
-mcmodel=medlow'
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 10.1.0 (GCC)
```
it seems the `-mfloat-abi=hard` in Target doesn't make sense, so how can I
generate a double float so file, anyone has some ideas, thanks!
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