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Merge #18750: build: optionally skip external warnings

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ba8950ee0134a7958e3e9b041cd54d222feb09a1 build: optionally skip external warnings (Vasil Dimov)

Pull request description:

  Add an option to `./configure` to suppress compilation warnings from
  external headers. The option is off by default (no change in behavior,
  show warnings from external headers).

  This option is useful if e.g. Boost or Qt is installed outside of
  `/usr/include` (warnings from headers in `/usr/include` are already
  suppressed by default) and those warnings stand in the way of compiling
  Bitcoin Core with `-Werror[=...]` or they just clutter the build output
  too much and make our own warnings hard to spot.

  `-isystem /usr/include` bricks GCC's `#include_next`, so we use
  `-idirafter` instead. This way we don't have to treat `/usr/include`
  specially.

ACKs for top commit:
  practicalswift:
    ACK ba8950ee0134a7958e3e9b041cd54d222feb09a1: diff looks correct!
  hebasto:
    ACK ba8950ee0134a7958e3e9b041cd54d222feb09a1, tested on Linux Mint 20 (x86_64).
  luke-jr:
    utACK ba8950ee0134a7958e3e9b041cd54d222feb09a1

Tree-SHA512: 9b54fae8590be6c79f2688a5aca09e0a9067f481dabecdd49bb278c08a62ac2b0cc704c894fbd53240e77ac84da0c7a237845df0a696cfbdb0359e1c8e2e10c9
This commit is contained in:
Wladimir J. van der Laan 2020-10-14 14:54:12 +02:00
commit 99a1d572ea
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GPG Key ID: 1E4AED62986CD25D
2 changed files with 39 additions and 2 deletions
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37
configure.ac
View File

@ -190,6 +190,16 @@ AC_ARG_ENABLE([ccache],
[use_ccache=$enableval],
[use_ccache=auto])
dnl Suppress warnings from external headers (e.g. Boost, Qt).
dnl May be useful if warnings from external headers clutter the build output
dnl too much, so that it becomes difficult to spot Bitcoin Core warnings
dnl or if they cause a build failure with --enable-werror.
AC_ARG_ENABLE([suppress-external-warnings],
[AS_HELP_STRING([--enable-suppress-external-warnings],
[Suppress warnings from external headers (default is no)])],
[suppress_external_warnings=$enableval],
[suppress_external_warnings=no])
AC_ARG_ENABLE([lcov],
[AS_HELP_STRING([--enable-lcov],
[enable lcov testing (default is no)])],
@ -1149,6 +1159,18 @@ AC_SUBST(LEVELDB_CPPFLAGS)
AC_SUBST(LIBLEVELDB)
AC_SUBST(LIBMEMENV)
dnl SUPPRESSED_CPPFLAGS=SUPPRESS_WARNINGS([$SOME_CPPFLAGS])
dnl Replace -I with -isystem in $SOME_CPPFLAGS to suppress warnings from
dnl headers from its include directories and return the result.
dnl See -isystem documentation:
dnl https://gcc.gnu.org/onlinedocs/gcc/Directory-Options.html
dnl https://clang.llvm.org/docs/ClangCommandLineReference.html#cmdoption-clang-isystem-directory
dnl Do not change "-I/usr/include" to "-isystem /usr/include" because that
dnl is not necessary (/usr/include is already a system directory) and because
dnl it would break GCC's #include_next.
AC_DEFUN([SUPPRESS_WARNINGS],
[$(echo $1 |${SED} -E -e 's/(^| )-I/\1-isystem /g' -e 's;-isystem /usr/include([/ ]|$);-I/usr/include\1;g')])
dnl enable-fuzz should disable all other targets
if test "x$enable_fuzz" = "xyes"; then
AC_MSG_WARN(enable-fuzz will disable all other targets)
@ -1184,11 +1206,22 @@ else
dnl sets $bitcoin_enable_qt, $bitcoin_enable_qt_test, $bitcoin_enable_qt_dbus
BITCOIN_QT_CONFIGURE([5.5.1])
dnl Keep a copy of the original $QT_INCLUDES and use it when invoking qt's moc
QT_INCLUDES_UNSUPPRESSED=$QT_INCLUDES
if test x$suppress_external_warnings != xno ; then
QT_INCLUDES=SUPPRESS_WARNINGS($QT_INCLUDES)
QT_DBUS_INCLUDES=SUPPRESS_WARNINGS($QT_DBUS_INCLUDES)
QT_TEST_INCLUDES=SUPPRESS_WARNINGS($QT_TEST_INCLUDES)
fi
fi
if test x$enable_wallet != xno; then
dnl Check for libdb_cxx only if wallet enabled
BITCOIN_FIND_BDB48
if test x$suppress_external_warnings != xno ; then
BDB_CPPFLAGS=SUPPRESS_WARNINGS($BDB_CPPFLAGS)
fi
fi
dnl Check for libminiupnpc (optional)
@ -1243,6 +1276,10 @@ AX_BOOST_THREAD
dnl Opt-in to boost-process
AS_IF([ test x$with_boost_process != x ], [ AX_BOOST_PROCESS ], [ ax_cv_boost_process=no ] )
if test x$suppress_external_warnings != xno; then
BOOST_CPPFLAGS=SUPPRESS_WARNINGS($BOOST_CPPFLAGS)
fi
dnl Boost 1.56 through 1.62 allow using std::atomic instead of its own atomic
dnl counter implementations. In 1.63 and later the std::atomic approach is default.
m4_pattern_allow(DBOOST_AC_USE_STD_ATOMIC) dnl otherwise it's treated like a macro

4
src/Makefile.qt.include
View File

@ -379,11 +379,11 @@ ui_%.h: %.ui
$(AM_V_GEN) QT_SELECT=$(QT_SELECT) $(UIC) -o $@ $< || (echo "Error creating $@"; false)
%.moc: %.cpp
$(AM_V_GEN) QT_SELECT=$(QT_SELECT) $(MOC) $(DEFAULT_INCLUDES) $(QT_INCLUDES) $(MOC_DEFS) $< | \
$(AM_V_GEN) QT_SELECT=$(QT_SELECT) $(MOC) $(DEFAULT_INCLUDES) $(QT_INCLUDES_UNSUPPRESSED) $(MOC_DEFS) $< | \
$(SED) -e '/^\*\*.*Created:/d' -e '/^\*\*.*by:/d' > $@
moc_%.cpp: %.h
$(AM_V_GEN) QT_SELECT=$(QT_SELECT) $(MOC) $(DEFAULT_INCLUDES) $(QT_INCLUDES) $(MOC_DEFS) $< | \
$(AM_V_GEN) QT_SELECT=$(QT_SELECT) $(MOC) $(DEFAULT_INCLUDES) $(QT_INCLUDES_UNSUPPRESSED) $(MOC_DEFS) $< | \
$(SED) -e '/^\*\*.*Created:/d' -e '/^\*\*.*by:/d' > $@
%.qm: %.ts