[Bug 1770342] Re: afl no longer builds from source with gcc-7; doesn't look for "as" in dir specified by -B

[Matthias Klose]

** Also affects: gcc-7 (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Changed in: gcc-7 (Ubuntu Bionic)
       Status: New => In Progress

** Changed in: gcc-7 (Ubuntu)
       Status: New => Fix Released

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Title:
  afl no longer builds from source with gcc-7; doesn't look for "as" in
  dir specified by -B

Status in gcc-7 package in Ubuntu:
  Fix Released
Status in gcc-7 source package in Bionic:
  In Progress

Bug description:
  This issue began upstream recently before Ubuntu 18.04 was released,
  when 7.3.0-16 was introduced and fixed the following issue:

  * Use triplet-prefixed as and ld (Helmut Grohne). Addresses: #895251.

  As can be seen in the continuous integration for afl
  (https://ci.debian.net/packages/a/afl/unstable/amd64/), the build
  failed tests from 2018-04-12 until 2018-05-08 (when version 7.3.0-18
  arrived).

  A bug report for the issue was raised (https://bugs.debian.org/cgi-
  bin/bugreport.cgi?bug=896057) and has been closed with the release of
  7.3.0-18.

  The symptom looks as follows by building afl from source (from
  http://lcamtuf.coredump.cx/afl/):

  bob at BOB2:~/afl-2.52b$ make
  [*] Checking for the ability to compile x86 code...
  [+] Everything seems to be working, ready to compile.
  cc -O3 -funroll-loops -Wall -D_FORTIFY_SOURCE=2 -g -Wno-pointer-sign -DAFL_PATH=\"/usr/local/lib/afl\" -DDOC_PATH=\"/usr/local/share/doc/afl\" -DBIN_PATH=\"/usr/local/bin\" afl-gcc.c -o afl-gcc -ldl
  set -e; for i in afl-g++ afl-clang afl-clang++; do ln -sf afl-gcc $i; done
  cc -O3 -funroll-loops -Wall -D_FORTIFY_SOURCE=2 -g -Wno-pointer-sign -DAFL_PATH=\"/usr/local/lib/afl\" -DDOC_PATH=\"/usr/local/share/doc/afl\" -DBIN_PATH=\"/usr/local/bin\" afl-fuzz.c -o afl-fuzz -ldl
  cc -O3 -funroll-loops -Wall -D_FORTIFY_SOURCE=2 -g -Wno-pointer-sign -DAFL_PATH=\"/usr/local/lib/afl\" -DDOC_PATH=\"/usr/local/share/doc/afl\" -DBIN_PATH=\"/usr/local/bin\" afl-showmap.c -o afl-showmap -ldl
  cc -O3 -funroll-loops -Wall -D_FORTIFY_SOURCE=2 -g -Wno-pointer-sign -DAFL_PATH=\"/usr/local/lib/afl\" -DDOC_PATH=\"/usr/local/share/doc/afl\" -DBIN_PATH=\"/usr/local/bin\" afl-tmin.c -o afl-tmin -ldl
  cc -O3 -funroll-loops -Wall -D_FORTIFY_SOURCE=2 -g -Wno-pointer-sign -DAFL_PATH=\"/usr/local/lib/afl\" -DDOC_PATH=\"/usr/local/share/doc/afl\" -DBIN_PATH=\"/usr/local/bin\" afl-gotcpu.c -o afl-gotcpu -ldl
  cc -O3 -funroll-loops -Wall -D_FORTIFY_SOURCE=2 -g -Wno-pointer-sign -DAFL_PATH=\"/usr/local/lib/afl\" -DDOC_PATH=\"/usr/local/share/doc/afl\" -DBIN_PATH=\"/usr/local/bin\" afl-analyze.c -o afl-analyze -ldl
  cc -O3 -funroll-loops -Wall -D_FORTIFY_SOURCE=2 -g -Wno-pointer-sign -DAFL_PATH=\"/usr/local/lib/afl\" -DDOC_PATH=\"/usr/local/share/doc/afl\" -DBIN_PATH=\"/usr/local/bin\" afl-as.c -o afl-as -ldl
  ln -sf afl-as as
  [*] Testing the CC wrapper and instrumentation output...
  unset AFL_USE_ASAN AFL_USE_MSAN; AFL_QUIET=1 AFL_INST_RATIO=100 AFL_PATH=. ./afl-gcc -O3 -funroll-loops -Wall -D_FORTIFY_SOURCE=2 -g -Wno-pointer-sign -DAFL_PATH=\"/usr/local/lib/afl\" -DDOC_PATH=\"/usr/local/share/doc/afl\" -DBIN_PATH=\"/usr/local/bin\" test-instr.c -o test-instr -ldl
  echo 0 | ./afl-showmap -m none -q -o .test-instr0 ./test-instr
  echo 1 | ./afl-showmap -m none -q -o .test-instr1 ./test-instr

  Oops, the instrumentation does not seem to be behaving correctly!

  Please ping <lcamtuf at google.com> to troubleshoot the issue.

  Makefile:90: recipe for target 'test_build' failed
  make: *** [test_build] Error 1
  bob at BOB2:~/afl-2.52b$

  I've tested Debian before and after and can confirm that 7.3.0-18
  resolves the problem.

  It would be very desirable to have this fixed in Ubuntu 18.04 as it's
  supported for 5 years, and afl is a popular tool that benefits from
  being rebuilt from source periodically.

  Anything I'm doing wrong here in reporting this issue, please don't
  hesitate to berate. I'm keen for this to get resolved and I'm willing
  to do some work helping to fix. If that involves proposing a patch,
  that's fine but I might need some guidance about how to make the
  proposal.

  Thanks.

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