gnat on x32

[Daniel Schepler]

Is gnat-4.9 supposed to work on x32, or is it currently unsupported?  I'm suspecting it's unsupported: when I tried to build a cross-compiler from x86_64 to x32, I got numerous errors in the standard library build like

/home/builder/gcc-4.9/gcc-4.9-4.9.1/build/./gcc/xgcc -B/home/builder/gcc-4.9/gcc-4.9-4.9.1/build/./gcc/ -c -g -O2  -W -Wall -gnatpg -nostdinc -g  \

      a-tags.adb -o a-tags.o

a-tags.adb:82:04: warning: types for unchecked conversion have different sizes

a-tags.adb:85:04: warning: types for unchecked conversion have different sizes

a-tags.adb:90:04: warning: types for unchecked conversion have different sizes

a-tags.adb:93:04: warning: types for unchecked conversion have different sizes

a-tags.adb:96:04: warning: types for unchecked conversion have different sizes

a-tags.adb:102:04: warning: types for unchecked conversion have different sizes

a-tags.adb:105:04: warning: types for unchecked conversion have different sizes

a-tags.adb:108:04: warning: types for unchecked conversion have different sizes

a-tags.adb:111:04: warning: types for unchecked conversion have different sizes

a-tags.adb:766:07: warning: types for unchecked conversion have different sizes

../gcc-interface/Makefile:2834: recipe for target 'a-tags.o' failed

make[7]: *** [a-tags.o] Error 1

And in src/gcc/ada/system-linux-x86_64.ads, it looks like it does declare System.Memory_Size := 2**64, unconditionally.

[Daniel Schepler]

On closer inspection, the Ada build files do contain some support for x32, but it seems it's not being activated in my case.  Maybe that's because I'm not compiling x32 as multilib, but as the primary target using --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnux32 --with-abi=mx32?