diff options
Diffstat (limited to 'm4')
| -rw-r--r-- | m4/manywarnings.m4 | 184 | ||||
| -rw-r--r-- | m4/warnings.m4 | 42 |
2 files changed, 226 insertions, 0 deletions
diff --git a/m4/manywarnings.m4 b/m4/manywarnings.m4 new file mode 100644 index 00000000000..fd0e3722d35 --- /dev/null +++ b/m4/manywarnings.m4 @@ -0,0 +1,184 @@ +# manywarnings.m4 serial 3 +dnl Copyright (C) 2008-2012 Free Software Foundation, Inc. +dnl This file is free software; the Free Software Foundation +dnl gives unlimited permission to copy and/or distribute it, +dnl with or without modifications, as long as this notice is preserved. + +dnl From Simon Josefsson + +# gl_MANYWARN_COMPLEMENT(OUTVAR, LISTVAR, REMOVEVAR) +# -------------------------------------------------- +# Copy LISTVAR to OUTVAR except for the entries in REMOVEVAR. +# Elements separated by whitespace. In set logic terms, the function +# does OUTVAR = LISTVAR \ REMOVEVAR. +AC_DEFUN([gl_MANYWARN_COMPLEMENT], +[ + gl_warn_set= + set x $2; shift + for gl_warn_item + do + case " $3 " in + *" $gl_warn_item "*) + ;; + *) + gl_warn_set="$gl_warn_set $gl_warn_item" + ;; + esac + done + $1=$gl_warn_set +]) + +# gl_MANYWARN_ALL_GCC(VARIABLE) +# ----------------------------- +# Add all documented GCC warning parameters to variable VARIABLE. +# Note that you need to test them using gl_WARN_ADD if you want to +# make sure your gcc understands it. +AC_DEFUN([gl_MANYWARN_ALL_GCC], +[ + dnl First, check if -Wno-missing-field-initializers is needed. + dnl -Wmissing-field-initializers is implied by -W, but that issues + dnl warnings with GCC version before 4.7, for the common idiom + dnl of initializing types on the stack to zero, using { 0, } + AC_REQUIRE([AC_PROG_CC]) + if test -n "$GCC"; then + + dnl First, check -W -Werror -Wno-missing-field-initializers is supported + dnl with the current $CC $CFLAGS $CPPFLAGS. + AC_MSG_CHECKING([whether -Wno-missing-field-initializers is supported]) + AC_CACHE_VAL([gl_cv_cc_nomfi_supported], [ + gl_save_CFLAGS="$CFLAGS" + CFLAGS="$CFLAGS -W -Werror -Wno-missing-field-initializers" + AC_COMPILE_IFELSE( + [AC_LANG_PROGRAM([[]], [[]])], + [gl_cv_cc_nomfi_supported=yes], + [gl_cv_cc_nomfi_supported=no]) + CFLAGS="$gl_save_CFLAGS"]) + AC_MSG_RESULT([$gl_cv_cc_nomfi_supported]) + + if test "$gl_cv_cc_nomfi_supported" = yes; then + dnl Now check whether -Wno-missing-field-initializers is needed + dnl for the { 0, } construct. + AC_MSG_CHECKING([whether -Wno-missing-field-initializers is needed]) + AC_CACHE_VAL([gl_cv_cc_nomfi_needed], [ + gl_save_CFLAGS="$CFLAGS" + CFLAGS="$CFLAGS -W -Werror" + AC_COMPILE_IFELSE( + [AC_LANG_PROGRAM( + [[void f (void) + { + typedef struct { int a; int b; } s_t; + s_t s1 = { 0, }; + } + ]], + [[]])], + [gl_cv_cc_nomfi_needed=no], + [gl_cv_cc_nomfi_needed=yes]) + CFLAGS="$gl_save_CFLAGS" + ]) + AC_MSG_RESULT([$gl_cv_cc_nomfi_needed]) + fi + fi + + gl_manywarn_set= + for gl_manywarn_item in \ + -Wall \ + -W \ + -Wformat-y2k \ + -Wformat-nonliteral \ + -Wformat-security \ + -Winit-self \ + -Wmissing-include-dirs \ + -Wswitch-default \ + -Wswitch-enum \ + -Wunused \ + -Wunknown-pragmas \ + -Wstrict-aliasing \ + -Wstrict-overflow \ + -Wsystem-headers \ + -Wfloat-equal \ + -Wtraditional \ + -Wtraditional-conversion \ + -Wdeclaration-after-statement \ + -Wundef \ + -Wshadow \ + -Wunsafe-loop-optimizations \ + -Wpointer-arith \ + -Wbad-function-cast \ + -Wc++-compat \ + -Wcast-qual \ + -Wcast-align \ + -Wwrite-strings \ + -Wconversion \ + -Wsign-conversion \ + -Wlogical-op \ + -Waggregate-return \ + -Wstrict-prototypes \ + -Wold-style-definition \ + -Wmissing-prototypes \ + -Wmissing-declarations \ + -Wmissing-noreturn \ + -Wmissing-format-attribute \ + -Wpacked \ + -Wpadded \ + -Wredundant-decls \ + -Wnested-externs \ + -Wunreachable-code \ + -Winline \ + -Winvalid-pch \ + -Wlong-long \ + -Wvla \ + -Wvolatile-register-var \ + -Wdisabled-optimization \ + -Wstack-protector \ + -Woverlength-strings \ + -Wbuiltin-macro-redefined \ + -Wmudflap \ + -Wpacked-bitfield-compat \ + -Wsync-nand \ + ; do + gl_manywarn_set="$gl_manywarn_set $gl_manywarn_item" + done + # The following are not documented in the manual but are included in + # output from gcc --help=warnings. + for gl_manywarn_item in \ + -Wattributes \ + -Wcoverage-mismatch \ + -Wmultichar \ + -Wunused-macros \ + ; do + gl_manywarn_set="$gl_manywarn_set $gl_manywarn_item" + done + # More warnings from gcc 4.6.2 --help=warnings. + for gl_manywarn_item in \ + -Wabi \ + -Wcpp \ + -Wdeprecated \ + -Wdeprecated-declarations \ + -Wdiv-by-zero \ + -Wdouble-promotion \ + -Wendif-labels \ + -Wextra \ + -Wformat-contains-nul \ + -Wformat-extra-args \ + -Wformat-zero-length \ + -Wformat=2 \ + -Wmultichar \ + -Wnormalized=nfc \ + -Woverflow \ + -Wpointer-to-int-cast \ + -Wpragmas \ + -Wsuggest-attribute=const \ + -Wsuggest-attribute=noreturn \ + -Wsuggest-attribute=pure \ + -Wtrampolines \ + ; do + gl_manywarn_set="$gl_manywarn_set $gl_manywarn_item" + done + + # Disable the missing-field-initializers warning if needed + if test "$gl_cv_cc_nomfi_needed" = yes; then + gl_manywarn_set="$gl_manywarn_set -Wno-missing-field-initializers" + fi + + $1=$gl_manywarn_set +]) diff --git a/m4/warnings.m4 b/m4/warnings.m4 new file mode 100644 index 00000000000..c14c4801e78 --- /dev/null +++ b/m4/warnings.m4 @@ -0,0 +1,42 @@ +# warnings.m4 serial 6 +dnl Copyright (C) 2008-2012 Free Software Foundation, Inc. +dnl This file is free software; the Free Software Foundation +dnl gives unlimited permission to copy and/or distribute it, +dnl with or without modifications, as long as this notice is preserved. + +dnl From Simon Josefsson + +# gl_AS_VAR_APPEND(VAR, VALUE) +# ---------------------------- +# Provide the functionality of AS_VAR_APPEND if Autoconf does not have it. +m4_ifdef([AS_VAR_APPEND], +[m4_copy([AS_VAR_APPEND], [gl_AS_VAR_APPEND])], +[m4_define([gl_AS_VAR_APPEND], +[AS_VAR_SET([$1], [AS_VAR_GET([$1])$2])])]) + + +# gl_WARN_ADD(PARAMETER, [VARIABLE = WARN_CFLAGS]) +# ------------------------------------------------ +# Adds parameter to WARN_CFLAGS if the compiler supports it. For example, +# gl_WARN_ADD([-Wparentheses]). +# +# If VARIABLE is a variable name, AC_SUBST it. +AC_DEFUN([gl_WARN_ADD], +dnl FIXME: gl_Warn must be used unquoted until we can assume +dnl autoconf 2.64 or newer. +[AS_VAR_PUSHDEF([gl_Warn], [gl_cv_warn_[]_AC_LANG_ABBREV[]_$1])dnl +AS_VAR_PUSHDEF([gl_Flags], [_AC_LANG_PREFIX[]FLAGS])dnl +AC_CACHE_CHECK([whether _AC_LANG compiler handles $1], m4_defn([gl_Warn]), [ + gl_save_compiler_FLAGS="$gl_Flags" + gl_Flags="$gl_Flags $1" + AC_COMPILE_IFELSE([AC_LANG_PROGRAM([])], + [AS_VAR_SET(gl_Warn, [yes])], + [AS_VAR_SET(gl_Warn, [no])]) + gl_Flags="$gl_save_compiler_FLAGS" +]) +AS_VAR_IF(gl_Warn, [yes], + [gl_AS_VAR_APPEND(m4_if([$2], [], [[WARN_CFLAGS]], [[$2]]), [" $1"])]) +AS_VAR_POPDEF([gl_Flags])dnl +AS_VAR_POPDEF([gl_Warn])dnl +m4_ifval([$2], [AS_LITERAL_IF([$2], [AC_SUBST([$2])], [])])dnl +]) |