tree 63905606cba9815362b1dc7d470458d2b3e92365
parent 36119de182154b1f87e0cdf4bd1efba9e2e64113
author Bertrand Jacquin <bertrand@jacquin.bzh> 1615062346 +0000
committer Willy Tarreau <w@1wt.eu> 1615299887 +0100
encoding latin1

MINOR: build: force CC to set a return code when probing options

gcc returns non zero code if an option is not supported (tested
from 6.5 to 10.2).

  $ gcc -Wfoobar -E -xc - -o /dev/null < /dev/null > /dev/null 2>&1 ; echo $?
  1

clang always return 0 if an option in not recognized unless
-Werror is also passed, preventing a correct probing of options
supported by the compiler (tested with clang 6.0.1 to 11.1.0).

  $ clang -Wfoobar -E -xc - -o /dev/null < /dev/null > /dev/null 2>&1 ; echo $?
  0
  $ clang -Werror -Wfoobar -E -xc - -o /dev/null < /dev/null > /dev/null 2>&1 ; echo $?
  1

Please note today this is not visible since clang 11 exit with SIGABRT
or with return code 1 on older version due to bad file descriptor from
file descriptor handling

  $ clang -Wfoobar -E -xc - -o /dev/null < /dev/null 2>&0 ; echo $?
  Aborted (core dumped)
  134
  $ clang -Wfoobar -E -xc - -o /dev/null < /dev/null ; echo $?
  warning: unknown warning option '-Wfoobar'; did you mean '-Wformat'? [-Wunknown-warning-option]
  1 warning generated.
  0
  $ clang-11 -Werror -Wfoobar -E -xc - -o /dev/null < /dev/null ; echo $?
  error: unknown warning option '-Wfoobar'; did you mean '-Wformat'? [-Werror,-Wunknown-warning-option]
  1

This specific issue is being tracked with clang upstream in https://bugs.llvm.org/show_bug.cgi?id=49463