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Merge #18887: build: enable -Werror=gnu

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a30b0a24e97eae7f6d1428c5bf339a579872f28e build: enable -Werror=gnu (Vasil Dimov)

Pull request description:

  Stop the build if a warning is emitted due to `-Wgnu` and
  `--enable-werror` has been used. As usual - this would help notice such
  a warning that is about to be introduced in new code.

  This is a followup to
  https://github.com/bitcoin/bitcoin/pull/18088 build: ensure we aren't using GNU extensions

ACKs for top commit:
  practicalswift:
    ACK a30b0a24e97eae7f6d1428c5bf339a579872f28e
  Empact:
    ACK a30b0a24e9

Tree-SHA512: f81b71cf3ee4db88b6f664c571075e0d30800a604f067f44273f256695a1dea533779db2ac859dd0a4cd8b66289c3e45f4aff1cfadfa160a1c354237167b05e2
This commit is contained in:
Wladimir J. van der Laan 2020-05-13 22:20:05 +02:00
commit 04c09553d8
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configure.ac
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@ -360,6 +360,7 @@ if test "x$enable_werror" = "xyes"; then
if test "x$CXXFLAG_WERROR" = "x"; then
AC_MSG_ERROR("enable-werror set but -Werror is not usable")
fi
AX_CHECK_COMPILE_FLAG([-Werror=gnu],[ERROR_CXXFLAGS="$ERROR_CXXFLAGS -Werror=gnu"],,[[$CXXFLAG_WERROR]])
AX_CHECK_COMPILE_FLAG([-Werror=vla],[ERROR_CXXFLAGS="$ERROR_CXXFLAGS -Werror=vla"],,[[$CXXFLAG_WERROR]])
AX_CHECK_COMPILE_FLAG([-Werror=switch],[ERROR_CXXFLAGS="$ERROR_CXXFLAGS -Werror=switch"],,[[$CXXFLAG_WERROR]])
AX_CHECK_COMPILE_FLAG([-Werror=thread-safety-analysis],[ERROR_CXXFLAGS="$ERROR_CXXFLAGS -Werror=thread-safety-analysis"],,[[$CXXFLAG_WERROR]])