Bug#1001675: libgcrypt20 FTBFS on armhf: error: ‘asm’ operand has impossible constraints

[Helmut Grohne]

Package: libgcrypt20
Version: 1.9.4-4
Severity: serious
Tags: ftbfs

Likely, you already know, but I'd it would help to have a bug number
here to track things: libgcrypt20 fails to build from source on armhf on
the buildds. The relevant excerpt is:

| ../../cipher/poly1305.c: In function ‘poly1305_blocks’:
| ../../cipher/poly1305.c:302:7: error: ‘asm’ operand has impossible constraints
|   302 |       __asm__ ("adds %0, %0, %5\n" \
|       |       ^~~~~~~
| ../../cipher/poly1305.c:425:7: note: in expansion of macro ‘ADD_1305_32’
|   425 |       ADD_1305_32(h4, h3, h2, h1, h0, m4, m3, m2, m1, m0);
|       |       ^~~~~~~~~~~

Helmut