2015-03-18 18:02:29 +00:00
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dnl Check whether a particular compiler flag works with code provided,
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dnl disable it in CFLAGS if the check fails.
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AC_DEFUN([NM_COMPILER_WARNING], [
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CFLAGS_SAVED="$CFLAGS"
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CFLAGS="$CFLAGS -Werror -W$1"
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AC_MSG_CHECKING(whether -W$1 works)
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AC_COMPILE_IFELSE([AC_LANG_SOURCE([[]])], [
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AC_COMPILE_IFELSE([AC_LANG_SOURCE([[$2]])], [
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AC_MSG_RESULT(yes)
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CFLAGS="$CFLAGS_SAVED -W$1"
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],[
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AC_MSG_RESULT(no)
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CFLAGS="$CFLAGS_SAVED -Wno-$1"
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])
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],[
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AC_MSG_RESULT(not supported)
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CFLAGS="$CFLAGS_SAVED"
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])
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])
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2009-04-22 00:50:45 +00:00
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AC_DEFUN([NM_COMPILER_WARNINGS],
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[AC_ARG_ENABLE(more-warnings,
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2012-01-29 21:01:56 +00:00
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AS_HELP_STRING([--enable-more-warnings], [Possible values: no/yes/error]),
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set_more_warnings="$enableval",set_more_warnings=error)
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2011-04-26 18:55:52 +00:00
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AC_MSG_CHECKING(for more warnings)
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2009-04-22 00:50:45 +00:00
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if test "$GCC" = "yes" -a "$set_more_warnings" != "no"; then
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AC_MSG_RESULT(yes)
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2015-03-18 18:02:29 +00:00
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dnl This is enabled in clang by default, makes little sense,
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dnl and causes the build to abort with -Werror.
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2014-10-29 10:52:47 +00:00
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CFLAGS_SAVED="$CFLAGS"
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2015-03-18 18:02:29 +00:00
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CFLAGS="$CFLAGS -Qunused-arguments"
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AC_COMPILE_IFELSE([AC_LANG_SOURCE([])], [], CFLAGS="$CFLAGS_SAVED")
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unset CFLAGS_SAVED
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2009-04-22 00:50:45 +00:00
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2014-07-26 18:11:31 +00:00
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dnl clang only warns about unknown warnings, unless
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dnl called with "-Werror=unknown-warning-option"
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dnl Test if the compiler supports that, and if it does
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dnl attach it to the CFLAGS.
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2015-03-18 18:02:29 +00:00
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NM_COMPILER_WARNING([unknown-warning-option], [])
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CFLAGS_SAVED="$CFLAGS"
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CFLAGS_MORE_WARNINGS="-Wall -std=gnu89"
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if test "x$set_more_warnings" = xerror; then
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CFLAGS_MORE_WARNINGS="$CFLAGS_MORE_WARNINGS -Werror"
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2014-07-26 18:11:31 +00:00
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fi
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2009-04-22 00:50:45 +00:00
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for option in -Wshadow -Wmissing-declarations -Wmissing-prototypes \
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2014-04-02 13:24:56 +00:00
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-Wdeclaration-after-statement -Wformat-security \
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2009-04-22 00:50:45 +00:00
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-Wfloat-equal -Wno-unused-parameter -Wno-sign-compare \
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2014-10-29 11:59:51 +00:00
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-Wstrict-prototypes \
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2011-04-14 18:16:55 +00:00
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-fno-strict-aliasing -Wno-unused-but-set-variable \
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2012-07-30 15:58:15 +00:00
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-Wundef -Wimplicit-function-declaration \
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-Wpointer-arith -Winit-self \
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2015-03-18 17:09:08 +00:00
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-Wmissing-include-dirs -Wno-pragmas; do
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2015-02-24 17:11:21 +00:00
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dnl GCC 4.4 does not warn when checking for -Wno-* flags (https://gcc.gnu.org/wiki/FAQ#wnowarning)
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2015-03-18 18:02:29 +00:00
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CFLAGS="$CFLAGS_MORE_WARNINGS $(printf '%s' "$option" | sed 's/^-Wno-/-W/') $CFLAGS_SAVED"
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AC_MSG_CHECKING([whether compiler understands $option])
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2009-04-22 00:50:45 +00:00
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AC_TRY_COMPILE([], [],
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has_option=yes,
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has_option=no,)
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2014-10-29 10:52:47 +00:00
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if test $has_option != no; then
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CFLAGS_MORE_WARNINGS="$CFLAGS_MORE_WARNINGS $option"
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2009-04-22 00:50:45 +00:00
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fi
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AC_MSG_RESULT($has_option)
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unset has_option
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done
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unset option
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2015-03-18 18:02:29 +00:00
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CFLAGS="$CFLAGS_SAVED"
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2014-10-29 10:52:47 +00:00
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unset CFLAGS_SAVED
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2015-03-18 18:02:29 +00:00
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dnl Disable warnings triggered by known compiler problems
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dnl https://bugzilla.gnome.org/show_bug.cgi?id=745821
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NM_COMPILER_WARNING([unknown-attributes], [#include <glib.h>])
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dnl https://llvm.org/bugs/show_bug.cgi?id=21614
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NM_COMPILER_WARNING([array-bounds],
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[#include <string.h>]
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[void f () { strcmp ("something", "0"); }]
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)
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dnl https://llvm.org/bugs/show_bug.cgi?id=22949
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NM_COMPILER_WARNING([parentheses-equality],
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[#include <sys/wait.h>]
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[void f () { if (WIFCONTINUED(0)) return; }]
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)
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dnl systemd-dhcp's log_internal macro and our handle_warn are sometimes
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dnl used in void context,u sometimes in int. Makes clang unhappy.
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NM_COMPILER_WARNING([unused-value],
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[#define yolo ({ (666 + 666); })]
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[int f () { int i = yolo; yolo; return i; }]
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)
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CFLAGS="$CFLAGS_MORE_WARNINGS $CFLAGS"
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2009-04-22 00:50:45 +00:00
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else
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AC_MSG_RESULT(no)
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fi
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])
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