root-system ftbfs on ARM32

g++ -save-temps -Wall -fsigned-char -fPIC -Iinclude -DR__HAVE_CONFIG -g -O2 -fstack-protector-strong -Wformat -Werror=format-security -D_FORTIFY_SOURCE=2 -pthread -o cint/cintex/src/CINTFunctional.o -c /home/doko/tmp/root-system-5.34.30/cint/cintex/src/CINTFunctional.cxx
CINTFunctional.s: Assembler messages:
CINTFunctional.s:224: Error: r13 not allowed here -- `sub sp,fp,#4'
CINTFunctional.s:267: Error: r13 not allowed here -- `sub sp,fp,#4'

/tmp/ccEfa5cv.s: Assembler messages:
/tmp/ccEfa5cv.s:225: Error: r13 not allowed here -- `sub sp,fp,#4'
/tmp/ccEfa5cv.s:269: Error: r13 not allowed here -- `sub sp,fp,#4'

    static void f1a(void* a0) {
    __asm__ __volatile__ ("push {fp, lr}\n\t"
                          "add fp, sp, #4\n\t"
                          "sub sp, sp, #8\n\t"
                          "str r0, [fp, #-8]\n\t"
                          "ldr r3, [pc, #16]\n\t"
                          "ldr r0, [pc, #16]\n\t"
                          "ldr r1, [fp, #-8]\n\t"
                          "blx r3\n\t"
                          "sub sp, fp, #4\n\t"
                          "pop {fp, pc}\n\t"
                          ".word 0xfafafafa\n\t"
                          ".word 0xdadadada");
    }

    static void f4a(void* a0, void* a1, void* a2, void* a3) {
    __asm__ __volatile__ ("push {fp, lr}\n\t"
                          "add fp, sp, #4\n\t"
                          "sub sp, sp, #24\n\t"
                          "str r0, [fp, #-8]\n\t"
                          "str r1, [fp, #-12]\n\t"
                          "str r2, [fp, #-16]\n\t"
                          "str r3, [fp, #-20]\n\t"
                          "ldr r3, [fp, #-20]\n\t"
                          "str r3, [sp]\n\t"
                          "ldr ip, [pc, #24]\n\t"
                          "ldr r0, [pc, #24]\n\t"
                          "ldr r1, [fp, #-8]\n\t"
                          "ldr r2, [fp, #-12]\n\t"
                          "ldr r3, [fp, #-16]\n\t"
                          "blx ip\n\t"
                          "sub sp, fp, #4\n\t"
                          "pop {fp, pc}\n\t"
                          ".word 0xfafafafa\n\t"
                          ".word 0xdadadada");
    }