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# manywarnings.m4 serial 3
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dnl Copyright (C) 2008-2012 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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gl_warn_set="$gl_warn_set $gl_warn_item"
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# gl_MANYWARN_ALL_GCC(VARIABLE)
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# -----------------------------
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# Add all documented GCC warning parameters to variable VARIABLE.
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# Note that you need to test them using gl_WARN_ADD if you want to
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# make sure your gcc understands it.
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AC_DEFUN([gl_MANYWARN_ALL_GCC],
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dnl First, check if -Wno-missing-field-initializers is needed.
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dnl -Wmissing-field-initializers is implied by -W, but that issues
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dnl warnings with GCC version before 4.7, for the common idiom
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dnl of initializing types on the stack to zero, using { 0, }
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AC_REQUIRE([AC_PROG_CC])
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if test -n "$GCC"; then
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dnl First, check -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="$CFLAGS -W -Werror -Wno-missing-field-initializers"
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[AC_LANG_PROGRAM([[]], [[]])],
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[gl_cv_cc_nomfi_supported=yes],
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[gl_cv_cc_nomfi_supported=no])
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CFLAGS="$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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typedef struct { int a; int b; } s_t;
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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="$gl_save_CFLAGS"
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AC_MSG_RESULT([$gl_cv_cc_nomfi_needed])
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for gl_manywarn_item in \
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-Wmissing-include-dirs \
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-Wtraditional-conversion \
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-Wdeclaration-after-statement \
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-Wunsafe-loop-optimizations \
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-Wbad-function-cast \
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-Wstrict-prototypes \
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-Wold-style-definition \
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-Wmissing-prototypes \
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-Wmissing-declarations \
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-Wmissing-format-attribute \
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-Wvolatile-register-var \
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-Wdisabled-optimization \
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-Woverlength-strings \
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-Wbuiltin-macro-redefined \
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-Wpacked-bitfield-compat \
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gl_manywarn_set="$gl_manywarn_set $gl_manywarn_item"
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# The following are not documented in the manual but are included in
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# output from gcc --help=warnings.
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for gl_manywarn_item in \
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-Wcoverage-mismatch \
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gl_manywarn_set="$gl_manywarn_set $gl_manywarn_item"
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# More warnings from gcc 4.6.2 --help=warnings.
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for gl_manywarn_item in \
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-Wdeprecated-declarations \
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-Wformat-contains-nul \
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-Wformat-extra-args \
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-Wformat-zero-length \
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-Wpointer-to-int-cast \
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-Wsuggest-attribute=const \
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-Wsuggest-attribute=noreturn \
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-Wsuggest-attribute=pure \
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gl_manywarn_set="$gl_manywarn_set $gl_manywarn_item"
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# Disable the missing-field-initializers warning if needed
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if test "$gl_cv_cc_nomfi_needed" = yes; then
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gl_manywarn_set="$gl_manywarn_set -Wno-missing-field-initializers"
added
removed
m4/manywarnings.m4
