Re: [Tinycc-devel] Regression building GMP with tcc, bisected

[Vincent Lefevre]

On 2020-07-05 21:22:27 -0400, John Scott wrote:
> tcc 0.9.27 works, but current mob fails during GMP's configure step. For GMP 
> I 
> use --disable-assembly and --disable-static, and it fails on
> checking how to define a 32-bit word... configure: error: cannot determine 
> how 
> to define a 32-bit word

The issue is that in the GMP test with the new tcc,
$gmp_cv_asm_label_suffix is empty instead of being ":", so that
the generated conftest.s is wrong and fails to assemble.

    for gmp_tmp_op in .long .word data4; do
      cat >conftest.s <<EOF
        $gmp_cv_asm_data
        $gmp_cv_asm_globl       foo
        $gmp_tmp_op     0
foo$gmp_cv_asm_label_suffix
        $gmp_cv_asm_byte        0
EOF

With the old tcc:

configure:25708: checking for assembler label suffix
trying 
configure:25721: tcc -c   conftest.s >conftest.out 2>&1
configure:25724: $? = 1
conftest.s:2: error: unknown opcode 'somelabel'
configure: failed program was:
        .text
somelabel
conftest.s:2: error: unknown opcode 'somelabel'
trying :
configure:25721: tcc -c   conftest.s >conftest.out 2>&1
configure:25724: $? = 0
configure:25744: result: :

With the new one:

configure:25708: checking for assembler label suffix
trying 
configure:25721: tcc -c   conftest.s >conftest.out 2>&1
configure:25724: $? = 0
configure:25744: result: 

So, the issue is that the program

        .text
somelabel

should fail while it doesn't (indeed, it does with gcc and old tcc,
but doesn't with the mod branch).

-- 
Vincent Lefèvre <vincent@vinc17.net> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)