Hi! I ended up here because of the subject message, but it started some time ago here: http://stackoverflow.com/questions/28932005/how-does-attribute-pcsaapcs-should-be-used-in-hardfp-abi-programs . I'd like to run hardfp with softfp programs/libraries by makeing some kind of wrapper/adapter. So one approach to do it could be exploiting aapcs / aapcs-vfp attributes, but I'm not really sure if this attributes work like I think they would. All the details are in the stackoverflow question, but I'll paste them here as well: I have a HardFP ABI (very) simple test program. It links with other HardFP binaries without any problems. Now I wanted to use a function from a Softfp ABI library in my code, so I changed the header file (.h) from this library to add the attibute: __ attribute__((pcs("aapcs"))) on every function which uses double args (like: void doSomething(double arg, double arg2)), so I'm telling the toolchain that this library uses softfp ABI. The problem is that the toolchain (arm-linux-androideabi-4.9) is yelling me that: /media/data_disk/b2g/work/hardfp/arm-linux-androideabi-4.9/bin/../lib/gcc/arm-linux-androideabi/4.9.x-google/../../../../arm-linux-androideabi/bin/ld: error: /tmp/cc6SmP3D.o uses VFP register arguments, output does not /media/data_disk/b2g/work/hardfp/arm-linux-androideabi-4.9/bin/../lib/gcc/arm-linux-androideabi/4.9.x-google/../../../../arm-linux-androideabi/bin/ld: error: /home/jgomez/b2g/build.flatfish.hardfp/out/target/product/flatfish/obj/lib/libc.so uses VFP register arguments, output does not /media/data_disk/b2g/work/hardfp/arm-linux-androideabi-4.9/bin/../lib/gcc/arm-linux-androideabi/4.9.x-google/../../../../arm-linux-androideabi/bin/ld: error: /home/jgomez/b2g/build.flatfish.hardfp/out/target/product/flatfish/obj/lib/libstdc++.so uses VFP register arguments, output does not /media/data_disk/b2g/work/hardfp/arm-linux-androideabi-4.9/bin/../lib/gcc/arm-linux-androideabi/4.9.x-google/../../../../arm-linux-androideabi/bin/ld: error: /home/jgomez/b2g/build.flatfish.hardfp/out/target/product/flatfish/obj/lib/libm.so uses VFP register arguments, output does not (Of course, libc, libstdc++, and libm are hardfp too). It doesn't compile. So my question is, How does __attribute__((pcs("aapcs"))) should be used to let HardFP ABI programs link with Softfp ABI binaries? I thought that this was the purpose of such a flag. Am I wrong? Thanks!!
