Description:
gcc does not work with -m32:

# echo 'main(){}' >xxx.c
# gcc -o xxx -m32 xxx.c
xxx.c:1:1: warning: return type defaults to ‘int’ [-Wimplicit-int]
main(){}
^~~~
/usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.1/libgcc.a when searching for -lgcc
/usr/bin/ld: cannot find -lgcc
/usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.1/../../../../lib/libgcc_s.so.1 when searching for libgcc_s.so.1
/usr/bin/ld: skipping incompatible /lib/../lib/libgcc_s.so.1 when searching for libgcc_s.so.1
/usr/bin/ld: skipping incompatible /usr/lib/../lib/libgcc_s.so.1 when searching for libgcc_s.so.1
/usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.1/../../../libgcc_s.so.1 when searching for libgcc_s.so.1
/usr/bin/ld: skipping incompatible /usr/lib/libgcc_s.so.1 when searching for libgcc_s.so.1
/usr/bin/ld: cannot find libgcc_s.so.1
/usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.1/libgcc.a when searching for -lgcc
/usr/bin/ld: cannot find -lgcc
collect2: error: ld returned 1 exit status

# pacman -Ss gcc|grep gcc-lib
core/gcc-libs 6.2.1-1 (base) [installed]
multilib/gcc-libs-multilib 6.2.1-1
multilib/lib32-gcc-libs 6.2.1-1 [installed]

# pacman -S gcc-libs-multilib
resolving dependencies...
looking for conflicting packages...
:: gcc-libs-multilib and gcc-libs are in conflict. Remove gcc-libs? [y/N] y

Packages (2) gcc-libs-6.2.1-1 [removal] gcc-libs-multilib-6.2.1-1

Total Download Size: 14.88 MiB
Total Installed Size: 78.41 MiB
Net Upgrade Size: 0.06 MiB

:: Proceed with installation? [Y/n]

-cut here-

Same failure again. gcc does not work with 32 bits. QED.

Additional info:
* core/gcc 6.2.1-1