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# manywarnings.m4 serial 8
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dnl Copyright (C) 2008-2017 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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dnl From Simon Josefsson
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# gl_MANYWARN_COMPLEMENT(OUTVAR, LISTVAR, REMOVEVAR)
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# --------------------------------------------------
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# Copy LISTVAR to OUTVAR except for the entries in REMOVEVAR.
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# Elements separated by whitespace. In set logic terms, the function
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# does OUTVAR = LISTVAR \ REMOVEVAR.
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AC_DEFUN([gl_MANYWARN_COMPLEMENT],
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[
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gl_warn_set=
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set x $2; shift
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for gl_warn_item
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do
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case " $3 " in
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*" $gl_warn_item "*)
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;;
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*)
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gl_warn_set="$gl_warn_set $gl_warn_item"
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;;
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esac
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done
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$1=$gl_warn_set
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])
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# gl_MANYWARN_ALL_GCC(VARIABLE)
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# -----------------------------
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# Add all documented GCC warning parameters to variable VARIABLE.
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# Note that you need to test them using gl_WARN_ADD if you want to
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# make sure your gcc understands it.
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AC_DEFUN([gl_MANYWARN_ALL_GCC],
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[
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dnl First, check for some issues that only occur when combining multiple
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dnl gcc warning categories.
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AC_REQUIRE([AC_PROG_CC])
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if test -n "$GCC"; then
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dnl Check if -W -Werror -Wno-missing-field-initializers is supported
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dnl with the current $CC $CFLAGS $CPPFLAGS.
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AC_MSG_CHECKING([whether -Wno-missing-field-initializers is supported])
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AC_CACHE_VAL([gl_cv_cc_nomfi_supported], [
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gl_save_CFLAGS="$CFLAGS"
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CFLAGS="$CFLAGS -W -Werror -Wno-missing-field-initializers"
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AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM([[]], [[]])],
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[gl_cv_cc_nomfi_supported=yes],
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[gl_cv_cc_nomfi_supported=no])
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CFLAGS="$gl_save_CFLAGS"])
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AC_MSG_RESULT([$gl_cv_cc_nomfi_supported])
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if test "$gl_cv_cc_nomfi_supported" = yes; then
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dnl Now check whether -Wno-missing-field-initializers is needed
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dnl for the { 0, } construct.
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AC_MSG_CHECKING([whether -Wno-missing-field-initializers is needed])
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AC_CACHE_VAL([gl_cv_cc_nomfi_needed], [
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gl_save_CFLAGS="$CFLAGS"
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CFLAGS="$CFLAGS -W -Werror"
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AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM(
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[[int f (void)
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{
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typedef struct { int a; int b; } s_t;
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s_t s1 = { 0, };
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return s1.b;
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}
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]],
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[[]])],
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[gl_cv_cc_nomfi_needed=no],
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[gl_cv_cc_nomfi_needed=yes])
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CFLAGS="$gl_save_CFLAGS"
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])
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AC_MSG_RESULT([$gl_cv_cc_nomfi_needed])
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fi
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dnl Next, check if -Werror -Wuninitialized is useful with the
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dnl user's choice of $CFLAGS; some versions of gcc warn that it
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dnl has no effect if -O is not also used
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AC_MSG_CHECKING([whether -Wuninitialized is supported])
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AC_CACHE_VAL([gl_cv_cc_uninitialized_supported], [
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gl_save_CFLAGS="$CFLAGS"
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CFLAGS="$CFLAGS -Werror -Wuninitialized"
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AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM([[]], [[]])],
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[gl_cv_cc_uninitialized_supported=yes],
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[gl_cv_cc_uninitialized_supported=no])
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CFLAGS="$gl_save_CFLAGS"])
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AC_MSG_RESULT([$gl_cv_cc_uninitialized_supported])
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fi
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# List all gcc warning categories.
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# To compare this list to your installed GCC's, run this Bash command:
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#
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# comm -3 \
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# <(sed -n 's/^ *\(-[^ ]*\) .*/\1/p' manywarnings.m4 | sort) \
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# <(gcc --help=warnings | sed -n 's/^ \(-[^ ]*\) .*/\1/p' | sort |
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# grep -v -x -F -f <(
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# awk '/^[^#]/ {print $1}' ../build-aux/gcc-warning.spec))
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gl_manywarn_set=
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for gl_manywarn_item in -fno-common \
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-W \
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-Wabi \
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-Waddress \
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-Waggressive-loop-optimizations \
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-Wall \
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-Wattributes \
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-Wbad-function-cast \
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-Wbool-compare \
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-Wbool-operation \
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-Wbuiltin-declaration-mismatch \
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-Wbuiltin-macro-redefined \
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-Wcast-align \
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-Wchar-subscripts \
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Packit |
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-Wchkp \
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-Wclobbered \
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-Wcomment \
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-Wcomments \
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-Wcoverage-mismatch \
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-Wcpp \
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-Wdangling-else \
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-Wdate-time \
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Packit |
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-Wdeprecated \
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-Wdeprecated-declarations \
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-Wdesignated-init \
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33f14e |
-Wdisabled-optimization \
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-Wdiscarded-array-qualifiers \
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33f14e |
-Wdiscarded-qualifiers \
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33f14e |
-Wdiv-by-zero \
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33f14e |
-Wdouble-promotion \
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33f14e |
-Wduplicated-branches \
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33f14e |
-Wduplicated-cond \
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33f14e |
-Wduplicate-decl-specifier \
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33f14e |
-Wempty-body \
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33f14e |
-Wendif-labels \
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33f14e |
-Wenum-compare \
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33f14e |
-Wexpansion-to-defined \
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Packit |
33f14e |
-Wextra \
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33f14e |
-Wformat-contains-nul \
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33f14e |
-Wformat-extra-args \
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Packit |
33f14e |
-Wformat-nonliteral \
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33f14e |
-Wformat-security \
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33f14e |
-Wformat-signedness \
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33f14e |
-Wformat-y2k \
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33f14e |
-Wformat-zero-length \
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33f14e |
-Wframe-address \
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33f14e |
-Wfree-nonheap-object \
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33f14e |
-Whsa \
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33f14e |
-Wignored-attributes \
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33f14e |
-Wignored-qualifiers \
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33f14e |
-Wimplicit \
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33f14e |
-Wimplicit-function-declaration \
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33f14e |
-Wimplicit-int \
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33f14e |
-Wincompatible-pointer-types \
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33f14e |
-Winit-self \
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33f14e |
-Winline \
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33f14e |
-Wint-conversion \
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33f14e |
-Wint-in-bool-context \
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-Wint-to-pointer-cast \
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33f14e |
-Winvalid-memory-model \
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33f14e |
-Winvalid-pch \
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Packit |
33f14e |
-Wjump-misses-init \
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33f14e |
-Wlogical-not-parentheses \
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Packit |
33f14e |
-Wlogical-op \
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Packit |
33f14e |
-Wmain \
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33f14e |
-Wmaybe-uninitialized \
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33f14e |
-Wmemset-elt-size \
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33f14e |
-Wmemset-transposed-args \
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Packit |
33f14e |
-Wmisleading-indentation \
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33f14e |
-Wmissing-braces \
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33f14e |
-Wmissing-declarations \
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33f14e |
-Wmissing-field-initializers \
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33f14e |
-Wmissing-include-dirs \
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33f14e |
-Wmissing-parameter-type \
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33f14e |
-Wmissing-prototypes \
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33f14e |
-Wmultichar \
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33f14e |
-Wnarrowing \
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33f14e |
-Wnested-externs \
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33f14e |
-Wnonnull \
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33f14e |
-Wnonnull-compare \
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33f14e |
-Wnull-dereference \
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33f14e |
-Wodr \
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33f14e |
-Wold-style-declaration \
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33f14e |
-Wold-style-definition \
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33f14e |
-Wopenmp-simd \
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33f14e |
-Woverflow \
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33f14e |
-Woverlength-strings \
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33f14e |
-Woverride-init \
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33f14e |
-Wpacked \
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33f14e |
-Wpacked-bitfield-compat \
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33f14e |
-Wparentheses \
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33f14e |
-Wpointer-arith \
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33f14e |
-Wpointer-compare \
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33f14e |
-Wpointer-sign \
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33f14e |
-Wpointer-to-int-cast \
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33f14e |
-Wpragmas \
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33f14e |
-Wpsabi \
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33f14e |
-Wrestrict \
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33f14e |
-Wreturn-local-addr \
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-Wreturn-type \
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33f14e |
-Wscalar-storage-order \
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33f14e |
-Wsequence-point \
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33f14e |
-Wshadow \
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33f14e |
-Wshift-count-negative \
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33f14e |
-Wshift-count-overflow \
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33f14e |
-Wshift-negative-value \
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-Wsizeof-array-argument \
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33f14e |
-Wsizeof-pointer-memaccess \
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33f14e |
-Wstack-protector \
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33f14e |
-Wstrict-aliasing \
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33f14e |
-Wstrict-overflow \
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33f14e |
-Wstrict-prototypes \
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33f14e |
-Wsuggest-attribute=const \
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-Wsuggest-attribute=format \
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33f14e |
-Wsuggest-attribute=noreturn \
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33f14e |
-Wsuggest-attribute=pure \
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33f14e |
-Wsuggest-final-methods \
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33f14e |
-Wsuggest-final-types \
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33f14e |
-Wswitch \
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-Wswitch-bool \
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-Wswitch-default \
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33f14e |
-Wswitch-unreachable \
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-Wsync-nand \
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33f14e |
-Wsystem-headers \
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33f14e |
-Wtautological-compare \
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33f14e |
-Wtrampolines \
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-Wtrigraphs \
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33f14e |
-Wtype-limits \
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-Wuninitialized \
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33f14e |
-Wunknown-pragmas \
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33f14e |
-Wunsafe-loop-optimizations \
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33f14e |
-Wunused \
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33f14e |
-Wunused-but-set-parameter \
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33f14e |
-Wunused-but-set-variable \
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Packit |
33f14e |
-Wunused-function \
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Packit |
33f14e |
-Wunused-label \
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Packit |
33f14e |
-Wunused-local-typedefs \
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Packit |
33f14e |
-Wunused-macros \
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Packit |
33f14e |
-Wunused-parameter \
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Packit |
33f14e |
-Wunused-result \
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Packit |
33f14e |
-Wunused-value \
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Packit |
33f14e |
-Wunused-variable \
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Packit |
33f14e |
-Wvarargs \
|
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Packit |
33f14e |
-Wvariadic-macros \
|
|
Packit |
33f14e |
-Wvector-operation-performance \
|
|
Packit |
33f14e |
-Wvla \
|
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Packit |
33f14e |
-Wvolatile-register-var \
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Packit |
33f14e |
-Wwrite-strings \
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33f14e |
\
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; do
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gl_manywarn_set="$gl_manywarn_set $gl_manywarn_item"
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done
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Packit |
33f14e |
|
|
Packit |
33f14e |
# gcc --help=warnings outputs an unusual form for these options; list
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Packit |
33f14e |
# them here so that the above 'comm' command doesn't report a false match.
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Packit |
33f14e |
# Would prefer "min (PTRDIFF_MAX, SIZE_MAX)", but it must be a literal:
|
|
Packit |
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ptrdiff_max_max=9223372036854775807
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|
Packit |
33f14e |
gl_manywarn_set="$gl_manywarn_set -Walloc-size-larger-than=$ptrdiff_max_max"
|
|
Packit |
33f14e |
gl_manywarn_set="$gl_manywarn_set -Warray-bounds=2"
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|
Packit |
33f14e |
gl_manywarn_set="$gl_manywarn_set -Wformat-overflow=2"
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|
Packit |
33f14e |
gl_manywarn_set="$gl_manywarn_set -Wformat-truncation=2"
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|
Packit |
33f14e |
gl_manywarn_set="$gl_manywarn_set -Wimplicit-fallthrough=5"
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Packit |
33f14e |
gl_manywarn_set="$gl_manywarn_set -Wnormalized=nfc"
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|
Packit |
33f14e |
gl_manywarn_set="$gl_manywarn_set -Wshift-overflow=2"
|
|
Packit |
33f14e |
gl_manywarn_set="$gl_manywarn_set -Wstringop-overflow=2"
|
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Packit |
33f14e |
gl_manywarn_set="$gl_manywarn_set -Wunused-const-variable=2"
|
|
Packit |
33f14e |
gl_manywarn_set="$gl_manywarn_set -Wvla-larger-than=4031"
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|
Packit |
33f14e |
|
|
Packit |
33f14e |
# These are needed for older GCC versions.
|
|
Packit |
33f14e |
if test -n "$GCC"; then
|
|
Packit |
33f14e |
case `($CC --version) 2>/dev/null` in
|
|
Packit |
33f14e |
'gcc (GCC) '[[0-3]].* | \
|
|
Packit |
33f14e |
'gcc (GCC) '4.[[0-7]].*)
|
|
Packit |
33f14e |
gl_manywarn_set="$gl_manywarn_set -fdiagnostics-show-option"
|
|
Packit |
33f14e |
gl_manywarn_set="$gl_manywarn_set -funit-at-a-time"
|
|
Packit |
33f14e |
;;
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Packit |
33f14e |
esac
|
|
Packit |
33f14e |
fi
|
|
Packit |
33f14e |
|
|
Packit |
33f14e |
# Disable specific options as needed.
|
|
Packit |
33f14e |
if test "$gl_cv_cc_nomfi_needed" = yes; then
|
|
Packit |
33f14e |
gl_manywarn_set="$gl_manywarn_set -Wno-missing-field-initializers"
|
|
Packit |
33f14e |
fi
|
|
Packit |
33f14e |
|
|
Packit |
33f14e |
if test "$gl_cv_cc_uninitialized_supported" = no; then
|
|
Packit |
33f14e |
gl_manywarn_set="$gl_manywarn_set -Wno-uninitialized"
|
|
Packit |
33f14e |
fi
|
|
Packit |
33f14e |
|
|
Packit |
33f14e |
$1=$gl_manywarn_set
|
|
Packit |
33f14e |
])
|