Full log: https://bitcoin.jonasschnelli.ch/builds/667/build_linux.log
Excerpt:
```
crypto/sha256.cpp: In function ‘std::string SHA256AutoDetect()’:
crypto/sha256.cpp:537:83: error: inconsistent operand constraints in an ‘asm’
   __asm__ ("cpuid" : "=a"(a), "=b"(b), "=c"(c), "=d"(d) : "0"(leaf), "2"(subleaf));
                                                                                   ^
crypto/sha256.cpp:537:83: error: inconsistent operand constraints in an ‘asm’
   __asm__ ("cpuid" : "=a"(a), "=b"(b), "=c"(c), "=d"(d) : "0"(leaf), "2"(subleaf));
                                                                                   ^
make[2]: *** [crypto/crypto_libbitcoin_crypto_base_a-sha256.o] Error 1
make[2]: *** Waiting for unfinished jobs....
  CXXLD    libunivalue.la
make[3]: Leaving directory `/home/ubuntu/build/bitcoin/distsrc-i686-pc-linux-gnu/src/univalue'
make[2]: Leaving directory `/home/ubuntu/build/bitcoin/distsrc-i686-pc-linux-gnu/src'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/ubuntu/build/bitcoin/distsrc-i686-pc-linux-gnu/src'
make: *** [all-recursive] Error 1
Round(a, b, c, d, e, f, g, h, 0x428a2f98ul + w0);
    Round(h, a, b, c, d, e, f, g, 0x71374491ul + w1);
    Round(g, h, a, b, c, d, e, f, 0xb5c0fbcful + w2);
    Round(f, g, h, a, b, c, d, e, 0xe9b5dba5ul + w3);
    Round(e, f, g, h, a, b, c, d, 0x3956c25bul + w4);
    Round(d, e, f, g, h, a, b, c, 0x59f111f1ul + w5);
    Round(c, d, e, f, g, h, a, b, 0x923f82a4ul + w6);
    Round(b, c, d, e, f, g, h, a, 0xab1c5ed5ul + w7);
    Round(a, b, c, d, e, f, g, h, 0x5807aa98ul);
    Round(h, a, b, c, d, e, f, g, 0x12835b01ul);
    Round(g, h, a, b, c, d, e, f, 0x243185beul);
    Round(f, g, h, a, b, c, d, e, 0x550c7dc3ul);
    Round(e, f, g, h, a, b, c, d, 0x72be5d74ul);
    Round(d, e, f, g, h, a, b, c, 0x80deb1feul);
    Round(c, d, e, f, g, h, a, b, 0x9bdc06a7ul);
    Round(b, c, d, e, f, g, h, a, 0xc19bf274ul);
    Round(a, b, c, d, e, f, g, h, 0xe49b69c1ul + (w0 += sigma0(w1)));
    Round(h, a, b, c, d, e, f, g, 0xefbe4786ul + (w1 += 0xa00000ul + sigma0(w2)));
    Round(g, h, a, b, c, d, e, f, 0x0fc19dc6ul + (w2 += sigma1(w0) + sigma0(w3)));
    Round(f, g, h, a, b, c, d, e, 0x240ca1ccul + (w3 += sigma1(w1) + sigma0(w4)));
    Round(e, f, g, h, a, b, c, d, 0x2de92c6ful + (w4 += sigma1(w2) + sigma0(w5)));
    Round(d, e, f, g, h, a, b, c, 0x4a7484aaul + (w5 += sigma1(w3) + sigma0(w6)));
    Round(c, d, e, f, g, h, a, b, 0x5cb0a9dcul + (w6 += sigma1(w4) + 0x100ul + sigma0(w7)));
    Round(b, c, d, e, f, g, h, a, 0x76f988daul + (w7 += sigma1(w5) + w0 + 0x11002000ul));
    Round(a, b, c, d, e, f, g, h, 0x983e5152ul + (w8 = 0x80000000ul + sigma1(w6) + w1));
    Round(h, a, b, c, d, e, f, g, 0xa831c66dul + (w9 = sigma1(w7) + w2));
    Round(g, h, a, b, c, d, e, f, 0xb00327c8ul + (w10 = sigma1(w8) + w3));
    Round(f, g, h, a, b, c, d, e, 0xbf597fc7ul + (w11 = sigma1(w9) + w4));
    Round(e, f, g, h, a, b, c, d, 0xc6e00bf3ul + (w12 = sigma1(w10) + w5));
    Round(d, e, f, g, h, a, b, c, 0xd5a79147ul + (w13 = sigma1(w11) + w6));