
This patch updates m4/compiler-warnings.m4 as follows to make it more compatible with clang: * clang doesn't support -Wunused-but-set-variable, which can be replaced with -Wunused-variable as the latter covers unused variables with or without an assigned value and is supported by gcc and clang. * -Wno-unused-function is added to let clang ignore unused functions that are auto-generated.
36 lines
1.0 KiB
Plaintext
36 lines
1.0 KiB
Plaintext
AC_DEFUN([NM_COMPILER_WARNINGS],
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[AC_ARG_ENABLE(more-warnings,
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AS_HELP_STRING([--enable-more-warnings], [Possible values: no/yes/error]),
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set_more_warnings="$enableval",set_more_warnings=error)
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AC_MSG_CHECKING(for more warnings)
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if test "$GCC" = "yes" -a "$set_more_warnings" != "no"; then
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AC_MSG_RESULT(yes)
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CFLAGS="-Wall -std=gnu89 $CFLAGS"
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for option in -Wmissing-declarations -Wmissing-prototypes \
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-Wdeclaration-after-statement -Wstrict-prototypes \
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-Wno-unused-parameter -Wno-sign-compare \
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-Wno-deprecated-declarations -Wno-unused-function \
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-Wunused-variable -Wformat-security; do
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SAVE_CFLAGS="$CFLAGS"
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CFLAGS="$CFLAGS $option -Werror"
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AC_MSG_CHECKING([whether gcc understands $option])
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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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if test $has_option = no; then
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CFLAGS="$SAVE_CFLAGS"
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fi
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AC_MSG_RESULT($has_option)
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unset has_option
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unset SAVE_CFLAGS
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done
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unset option
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if test "x$set_more_warnings" = xerror; then
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CFLAGS="$CFLAGS -Werror"
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fi
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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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