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263 lines
7.4 KiB
Plaintext
263 lines
7.4 KiB
Plaintext
# manywarnings.m4 serial 7
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dnl Copyright (C) 2008-2016 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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[[void 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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}
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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 <(
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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 \
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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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-Wbuiltin-macro-redefined \
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-Wcast-align \
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-Wchar-subscripts \
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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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-Wdate-time \
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-Wdeprecated \
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-Wdeprecated-declarations \
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-Wdesignated-init \
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-Wdisabled-optimization \
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-Wdiscarded-array-qualifiers \
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-Wdiscarded-qualifiers \
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-Wdiv-by-zero \
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-Wdouble-promotion \
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-Wempty-body \
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-Wendif-labels \
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-Wenum-compare \
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-Wextra \
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-Wformat-contains-nul \
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-Wformat-extra-args \
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-Wformat-nonliteral \
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-Wformat-security \
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-Wformat-signedness \
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-Wformat-y2k \
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-Wformat-zero-length \
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-Wfree-nonheap-object \
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-Wignored-qualifiers \
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-Wimplicit \
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-Wimplicit-function-declaration \
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-Wimplicit-int \
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-Wincompatible-pointer-types \
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-Winit-self \
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-Winline \
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-Wint-conversion \
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-Wint-to-pointer-cast \
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-Winvalid-memory-model \
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-Winvalid-pch \
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-Wjump-misses-init \
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-Wlogical-not-parentheses \
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-Wlogical-op \
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-Wmain \
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-Wmaybe-uninitialized \
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-Wmemset-transposed-args \
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-Wmissing-braces \
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-Wmissing-declarations \
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-Wmissing-field-initializers \
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-Wmissing-include-dirs \
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-Wmissing-parameter-type \
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-Wmissing-prototypes \
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-Wmultichar \
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-Wnarrowing \
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-Wnested-externs \
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-Wnonnull \
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-Wodr \
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-Wold-style-declaration \
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-Wold-style-definition \
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-Wopenmp-simd \
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-Woverflow \
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-Woverlength-strings \
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-Woverride-init \
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-Wpacked \
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-Wpacked-bitfield-compat \
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-Wparentheses \
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-Wpointer-arith \
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-Wpointer-sign \
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-Wpointer-to-int-cast \
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-Wpragmas \
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-Wreturn-local-addr \
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-Wreturn-type \
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-Wsequence-point \
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-Wshadow \
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-Wshift-count-negative \
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-Wshift-count-overflow \
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-Wsizeof-array-argument \
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-Wsizeof-pointer-memaccess \
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-Wstack-protector \
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-Wstrict-aliasing \
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-Wstrict-overflow \
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-Wstrict-prototypes \
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-Wsuggest-attribute=const \
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-Wsuggest-attribute=format \
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-Wsuggest-attribute=noreturn \
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-Wsuggest-attribute=pure \
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-Wsuggest-final-methods \
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-Wsuggest-final-types \
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-Wswitch \
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-Wswitch-bool \
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-Wswitch-default \
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-Wsync-nand \
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-Wsystem-headers \
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-Wtrampolines \
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-Wtrigraphs \
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-Wtype-limits \
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-Wuninitialized \
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-Wunknown-pragmas \
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-Wunsafe-loop-optimizations \
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-Wunused \
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-Wunused-but-set-parameter \
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-Wunused-but-set-variable \
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-Wunused-function \
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-Wunused-label \
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-Wunused-local-typedefs \
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-Wunused-macros \
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-Wunused-parameter \
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-Wunused-result \
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-Wunused-value \
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-Wunused-variable \
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-Wvarargs \
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-Wvariadic-macros \
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-Wvector-operation-performance \
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-Wvla \
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-Wvolatile-register-var \
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-Wwrite-strings \
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\
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; do
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gl_manywarn_set="$gl_manywarn_set $gl_manywarn_item"
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done
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# gcc --help=warnings outputs an unusual form for these options; list
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# them here so that the above 'comm' command doesn't report a false match.
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gl_manywarn_set="$gl_manywarn_set -Warray-bounds=2"
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gl_manywarn_set="$gl_manywarn_set -Wnormalized=nfc"
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# These are needed for older GCC versions.
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if test -n "$GCC"; then
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case `($CC --version) 2>/dev/null` in
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'gcc (GCC) '[[0-3]].* | \
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'gcc (GCC) '4.[[0-7]].*)
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gl_manywarn_set="$gl_manywarn_set -fdiagnostics-show-option"
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gl_manywarn_set="$gl_manywarn_set -funit-at-a-time"
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;;
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esac
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fi
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# Disable specific options as needed.
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if test "$gl_cv_cc_nomfi_needed" = yes; then
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gl_manywarn_set="$gl_manywarn_set -Wno-missing-field-initializers"
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fi
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if test "$gl_cv_cc_uninitialized_supported" = no; then
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gl_manywarn_set="$gl_manywarn_set -Wno-uninitialized"
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fi
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$1=$gl_manywarn_set
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])
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