X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fwarnings.m4;h=e3d239b64ffbc737d4f6ce993355c477a4884925;hb=fa1db0dd22768f09a507674a30beb5b8a87bb35f;hp=f836793aba867ba19dae5bada9bc7b1c609ea00f;hpb=c23fafe9a03c4216789d09d65224d9200d528026;p=gnulib.git diff --git a/m4/warnings.m4 b/m4/warnings.m4 index f836793ab..e3d239b64 100644 --- a/m4/warnings.m4 +++ b/m4/warnings.m4 @@ -1,19 +1,11 @@ -# warnings.m4 serial 1 -dnl Copyright (C) 2008 Free Software Foundation, Inc. +# warnings.m4 serial 11 +dnl Copyright (C) 2008-2013 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_IF(VAR, VALUE, [IF-MATCH], [IF-NOT-MATCH]) -# ---------------------------------------------------- -# Provide the functionality of AS_VAR_IF if Autoconf does not have it. -m4_ifdef([AS_VAR_IF], -[m4_copy([AS_VAR_IF], [gl_AS_VAR_IF])], -[m4_define([gl_AS_VAR_IF], -[AS_IF([test x"AS_VAR_GET([$1])" = x""$2], [$3], [$4])])]) - # gl_AS_VAR_APPEND(VAR, VALUE) # ---------------------------- # Provide the functionality of AS_VAR_APPEND if Autoconf does not have it. @@ -22,108 +14,66 @@ m4_ifdef([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]). -AC_DEFUN([gl_WARN_ADD], -[AS_VAR_PUSHDEF([gl_Warn], [gl_cv_warn_$1])dnl -AC_CACHE_CHECK([whether compiler handles $1], [gl_Warn], [ - save_CFLAGS="$CFLAGS" - CFLAGS="${CFLAGS} $1" - AC_PREPROC_IFELSE([AC_LANG_PROGRAM([])], - [AS_VAR_SET([gl_Warn], [yes])], - [AS_VAR_SET([gl_Warn], [no])]) - CFLAGS="$save_CFLAGS" + +# gl_COMPILER_OPTION_IF(OPTION, [IF-SUPPORTED], [IF-NOT-SUPPORTED], +# [PROGRAM = AC_LANG_PROGRAM()]) +# ----------------------------------------------------------------- +# Check if the compiler supports OPTION when compiling PROGRAM. +# +# FIXME: gl_Warn must be used unquoted until we can assume Autoconf +# 2.64 or newer. +AC_DEFUN([gl_COMPILER_OPTION_IF], +[AS_VAR_PUSHDEF([gl_Warn], [gl_cv_warn_[]_AC_LANG_ABBREV[]_$1])dnl +AS_VAR_PUSHDEF([gl_Flags], [_AC_LANG_PREFIX[]FLAGS])dnl +AS_LITERAL_IF([$1], + [m4_pushdef([gl_Positive], m4_bpatsubst([$1], [^-Wno-], [-W]))], + [gl_positive="$1" +case $gl_positive in + -Wno-*) gl_positive=-W`expr "X$gl_positive" : 'X-Wno-\(.*\)'` ;; +esac +m4_pushdef([gl_Positive], [$gl_positive])])dnl +AC_CACHE_CHECK([whether _AC_LANG compiler handles $1], m4_defn([gl_Warn]), [ + gl_save_compiler_FLAGS="$gl_Flags" + gl_AS_VAR_APPEND(m4_defn([gl_Flags]), + [" $gl_unknown_warnings_are_errors ]m4_defn([gl_Positive])["]) + AC_LINK_IFELSE([m4_default([$4], [AC_LANG_PROGRAM([])])], + [AS_VAR_SET(gl_Warn, [yes])], + [AS_VAR_SET(gl_Warn, [no])]) + gl_Flags="$gl_save_compiler_FLAGS" ]) -AS_VAR_PUSHDEF([gl_Flags], m4_if([$2], [], [[WARN_CFLAGS]], [[$2]]))dnl -gl_AS_VAR_IF([gl_Warn], [yes], [gl_AS_VAR_APPEND([gl_Flags], [" $1"])]) +AS_VAR_IF(gl_Warn, [yes], [$2], [$3]) +m4_popdef([gl_Positive])dnl AS_VAR_POPDEF([gl_Flags])dnl AS_VAR_POPDEF([gl_Warn])dnl -m4_ifval([$2], [AS_LITERAL_IF([$2], [AC_SUBST([$2])], [])])dnl ]) -# gl_WARN_SUPPORTED(VARIABLE) -# ---------------------- -# Add all supported warning parameters to variable VARIABLE. -AC_DEFUN([gl_WARN_SUPPORTED], -[ - FOO= - # List of all supported warning parameters according to GCC 4.3.2 manual. - for w in \ - -Wall \ - -W \ - -Wformat-y2k \ - -Wformat-nonliteral \ - -Wformat-security \ - -Winit-self \ - -Wmissing-include-dirs \ - -Wswitch-default \ - -Wswitch-enum \ - -Wunused \ - -Wunknown-pragmas \ - -Wstrict-aliasing \ - -Wstrict-overflow \ - -Wsystem-headers \ - -Wfloat-equal \ - -Wtraditional \ - -Wtraditional-conversion \ - -Wdeclaration-after-statement \ - -Wundef \ - -Wshadow \ - -Wunsafe-loop-optimizations \ - -Wpointer-arith \ - -Wbad-function-cast \ - -Wc++-compat \ - -Wcast-qual \ - -Wcast-align \ - -Wwrite-strings \ - -Wconversion \ - -Wsign-conversion \ - -Wlogical-op \ - -Waggregate-return \ - -Wstrict-prototypes \ - -Wold-style-definition \ - -Wmissing-prototypes \ - -Wmissing-declarations \ - -Wmissing-noreturn \ - -Wmissing-format-attribute \ - -Wpacked \ - -Wpadded \ - -Wredundant-decls \ - -Wnested-externs \ - -Wunreachable-code \ - -Winline \ - -Winvalid-pch \ - -Wlong-long \ - -Wvla \ - -Wvolatile-register-var \ - -Wdisabled-optimization \ - -Wstack-protector \ - -Woverlength-strings \ - ; do - FOO="$FOO $w" - done - $1=$FOO -]) +# gl_UNKNOWN_WARNINGS_ARE_ERRORS +# ------------------------------ +# Clang doesn't complain about unknown warning options unless one also +# specifies -Wunknown-warning-option -Werror. Detect this. +AC_DEFUN([gl_UNKNOWN_WARNINGS_ARE_ERRORS], +[gl_COMPILER_OPTION_IF([-Werror -Wunknown-warning-option], + [gl_unknown_warnings_are_errors='-Wunknown-warning-option -Werror'], + [gl_unknown_warnings_are_errors=])]) -# gl_WARN_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_WARN_COMPLEMENT], -[ - FOO= - set -- "$2" - for w in $_; do - case "$3" in - *" $w "* | *" $w" | "$w "*) - ;; - *) - FOO="$FOO $w" - ;; - esac - done - $1=$FOO +# gl_WARN_ADD(OPTION, [VARIABLE = WARN_CFLAGS], +# [PROGRAM = AC_LANG_PROGRAM()]) +# --------------------------------------------- +# Adds parameter to WARN_CFLAGS if the compiler supports it when +# compiling PROGRAM. For example, gl_WARN_ADD([-Wparentheses]). +# +# If VARIABLE is a variable name, AC_SUBST it. +AC_DEFUN([gl_WARN_ADD], +[AC_REQUIRE([gl_UNKNOWN_WARNINGS_ARE_ERRORS]) +gl_COMPILER_OPTION_IF([$1], + [gl_AS_VAR_APPEND(m4_if([$2], [], [[WARN_CFLAGS]], [[$2]]), [" $1"])], + [], + [$3]) +m4_ifval([$2], + [AS_LITERAL_IF([$2], [AC_SUBST([$2])])], + [AC_SUBST([WARN_CFLAGS])])dnl ]) + +# Local Variables: +# mode: autoconf +# End: