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configure will also warn on 'strict compiler warning' rejected options

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Yang Tse 16 years ago
parent 3eddc11844
commit 98846c3419
1 changed files with 177 additions and 95 deletions
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  1. 176
      m4/cares-compilers.m4

176
m4/cares-compilers.m4
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@ -16,7 +16,7 @@
#***************************************************************************
# File version for 'aclocal' use. Keep it a single number.
# serial 14
# serial 15
dnl CARES_CHECK_COMPILER
@ -269,6 +269,46 @@ AC_DEFUN([CARES_CHECK_COMPILER_SUN], [
])
dnl CARES_CONVERT_INCLUDE_TO_ISYSTEM
dnl -------------------------------------------------
dnl Changes standard include paths present in CFLAGS
dnl and CPPFLAGS into isystem include paths. This is
dnl done to prevent GNUC from generating warnings on
dnl headers from these locations, even though this is
dnl not reliable on ancient GNUC versions.
AC_DEFUN([CARES_CONVERT_INCLUDE_TO_ISYSTEM], [
tmp_has_include="no"
tmp_chg_FLAGS=$CFLAGS
for word1 in $tmp_chg_FLAGS; do
case "$word" in
-I*)
tmp_has_include="yes"
;;
esac
done
if test "$tmp_has_include" = "yes"; then
tmp_chg_FLAGS=`echo $tmp_chg_FLAGS | sed 's/^-I/ -isystem /g'`
tmp_chg_FLAGS=`echo $tmp_chg_FLAGS | sed 's/ -I/ -isystem /g'`
CFLAGS=`eval echo $tmp_chg_FLAGS`
fi
tmp_has_include="no"
tmp_chg_FLAGS=$CPPFLAGS
for word1 in $tmp_chg_FLAGS; do
case "$word" in
-I*)
tmp_has_include="yes"
;;
esac
done
if test "$tmp_has_include" = "yes"; then
tmp_chg_FLAGS=`echo $tmp_chg_FLAGS | sed 's/^-I/ -isystem /g'`
tmp_chg_FLAGS=`echo $tmp_chg_FLAGS | sed 's/ -I/ -isystem /g'`
CPPFLAGS=`eval echo $tmp_chg_FLAGS`
fi
])
dnl CARES_COMPILER_WORKS_IFELSE ([ACTION-IF-WORKS], [ACTION-IF-NOT-WORKS])
dnl -------------------------------------------------
dnl Verify if the C compiler seems to work with the
@ -308,6 +348,9 @@ AC_DEFUN([CARES_COMPILER_WORKS_IFELSE], [
test "$tmp_compiler_works" = "yes"; then
AC_RUN_IFELSE([
AC_LANG_PROGRAM([[
# ifdef __STDC__
# include <stdlib.h>
# endif
]],[[
int i = 0;
exit(i);
@ -337,6 +380,10 @@ AC_DEFUN([CARES_SET_COMPILER_BASIC_OPTS], [
AC_REQUIRE([CARES_CHECK_COMPILER])dnl
#
if test "$compiler_id" != "unknown"; then
#
if test "$compiler_id" = "GNUC"; then
CARES_CONVERT_INCLUDE_TO_ISYSTEM
fi
#
tmp_save_CPPFLAGS="$CPPFLAGS"
tmp_save_CFLAGS="$CFLAGS"
@ -581,39 +628,49 @@ AC_DEFUN([CARES_SET_COMPILER_WARNING_OPTS], [
AC_REQUIRE([CARES_CHECK_OPTION_WARNINGS])dnl
AC_REQUIRE([CARES_CHECK_COMPILER])dnl
#
if test "$compiler_id" = "DECC"; then
if test "$compiler_id" != "unknown"; then
#
tmp_save_CPPFLAGS="$CPPFLAGS"
tmp_save_CFLAGS="$CFLAGS"
tmp_CPPFLAGS=""
tmp_CFLAGS=""
#
case "$compiler_id" in
#
DECC)
#
if test "$want_warnings" = "yes"; then
dnl Select a higher warning level than default level2
CFLAGS="$CFLAGS -msg_enable level3"
fi
tmp_CFLAGS="$tmp_CFLAGS -msg_enable level3"
fi
;;
#
if test "$compiler_id" = "GNUC"; then
#
# FIXME: Some of these warnings should be changed into errors
# and moved to CARES-SET-COMPILER-BASIC-OPTS
GNUC)
#
if test "$want_warnings" = "yes"; then
dnl this is a set of options we believe *ALL* gcc versions support:
WARN="-W -Wall -Wwrite-strings -pedantic -Wpointer-arith -Wnested-externs -Winline -Wmissing-prototypes"
dnl Set of options we believe *ALL* gcc versions support:
tmp_CFLAGS="$tmp_CFLAGS -pedantic -Wall -W -Winline -Wnested-externs"
tmp_CFLAGS="$tmp_CFLAGS -Wmissing-prototypes -Wpointer-arith"
tmp_CFLAGS="$tmp_CFLAGS -Wwrite-strings"
dnl -Wcast-align is a bit too annoying on all gcc versions ;-)
if test "$compiler_num" -ge "207"; then
dnl gcc 2.7 or later
WARN="$WARN -Wmissing-declarations"
tmp_CFLAGS="$tmp_CFLAGS -Wmissing-declarations"
fi
if test "$compiler_num" -gt "295"; then
dnl only if the compiler is newer than 2.95 since we got lots of
dnl "`_POSIX_C_SOURCE' is not defined" in system headers with
dnl gcc 2.95.4 on FreeBSD 4.9!
WARN="$WARN -Wundef -Wno-long-long -Wsign-compare -Wshadow -Wno-multichar"
tmp_CFLAGS="$tmp_CFLAGS -Wno-long-long -Wno-multichar -Wshadow"
tmp_CFLAGS="$tmp_CFLAGS -Wsign-compare -Wundef"
fi
if test "$compiler_num" -ge "296"; then
dnl gcc 2.96 or later
WARN="$WARN -Wfloat-equal"
tmp_CFLAGS="$tmp_CFLAGS -Wfloat-equal"
fi
if test "$compiler_num" -gt "296"; then
dnl this option does not exist in 2.96
WARN="$WARN -Wno-format-nonliteral"
tmp_CFLAGS="$tmp_CFLAGS -Wno-format-nonliteral"
fi
dnl -Wunreachable-code seems totally unreliable on my gcc 3.3.2 on
dnl on i686-Linux as it gives us heaps with false positives.
@ -621,60 +678,85 @@ AC_DEFUN([CARES_SET_COMPILER_WARNING_OPTS], [
dnl over making it unusable for generic purposes. Let's not use it.
if test "$compiler_num" -ge "303"; then
dnl gcc 3.3 and later
WARN="$WARN -Wendif-labels -Wstrict-prototypes"
tmp_CFLAGS="$tmp_CFLAGS -Wendif-labels -Wstrict-prototypes"
fi
if test "$compiler_num" -ge "304"; then
# try these on gcc 3.4
WARN="$WARN -Wdeclaration-after-statement"
fi
for flag in $CPPFLAGS; do
case "$flag" in
-I*)
dnl Include path, provide a -isystem option for the same dir
dnl to prevent warnings in those dirs. The -isystem was not very
dnl reliable on earlier gcc versions.
add=`echo $flag | sed 's/^-I/-isystem /g'`
WARN="$WARN $add"
;;
esac
done
CFLAGS="$CFLAGS $WARN"
AC_MSG_NOTICE([Added this set of compiler options: $WARN])
dnl gcc 3.4 and later
tmp_CFLAGS="$tmp_CFLAGS -Wdeclaration-after-statement"
fi
fi
;;
#
HPUXC)
#
if test "$compiler_id" = "HPUXC"; then
if test "$want_warnings" = "yes"; then
dnl Issue all warnings
CFLAGS="$CFLAGS +w1"
fi
tmp_CFLAGS="$tmp_CFLAGS +w1"
fi
;;
#
IBMC)
#
dnl Placeholder
tmp_CFLAGS="$tmp_CFLAGS"
;;
#
ICC_unix)
#
if test "$compiler_id" = "ICC_unix"; then
if test "$want_warnings" = "yes"; then
if test "$compiler_num" -gt "600"; then
dnl Show errors, warnings, and remarks
CPPFLAGS="$CPPFLAGS -Wall"
tmp_CPPFLAGS="$tmp_CPPFLAGS -Wall"
dnl Perform extra compile-time code checking
CPPFLAGS="$CPPFLAGS -Wcheck"
fi
tmp_CPPFLAGS="$tmp_CPPFLAGS -Wcheck"
fi
fi
;;
#
ICC_windows)
#
dnl Placeholder
tmp_CFLAGS="$tmp_CFLAGS"
;;
#
SGIC)
#
if test "$compiler_id" = "SGIC"; then
if test "$want_warnings" = "yes"; then
dnl Perform stricter semantic and lint-like checks
CFLAGS="$CFLAGS -fullwarn"
fi
tmp_CFLAGS="$tmp_CFLAGS -fullwarn"
fi
;;
#
SUNC)
#
if test "$compiler_id" = "SUNC"; then
if test "$want_warnings" = "yes"; then
dnl Perform stricter semantic and lint-like checks
CFLAGS="$CFLAGS -v"
tmp_CFLAGS="$tmp_CFLAGS -v"
fi
;;
#
esac
#
tmp_CPPFLAGS=`eval echo $tmp_CPPFLAGS`
tmp_CFLAGS=`eval echo $tmp_CFLAGS`
#
if test ! -z "$tmp_CFLAGS" || test ! -z "$tmp_CPPFLAGS"; then
AC_MSG_CHECKING([if compiler accepts strict warning options])
CPPFLAGS=`eval echo $tmp_save_CPPFLAGS $tmp_CPPFLAGS`
CFLAGS=`eval echo $tmp_save_CFLAGS $tmp_CFLAGS`
CARES_COMPILER_WORKS_IFELSE([
AC_MSG_RESULT([yes])
AC_MSG_NOTICE([compiler options added: $tmp_CFLAGS $tmp_CPPFLAGS])
],[
AC_MSG_RESULT([no])
AC_MSG_WARN([compiler options rejected: $tmp_CFLAGS $tmp_CPPFLAGS])
dnl restore initial settings
CPPFLAGS="$tmp_save_CPPFLAGS"
CFLAGS="$tmp_save_CFLAGS"
])
fi
#
fi
])
@ -733,8 +815,8 @@ dnl is considered positive, otherwise false.
AC_DEFUN([CARES_VAR_MATCH], [
ac_var_match_word="no"
for word1 in "$[$1]"; do
for word2 in "[$2]"; do
for word1 in $[$1]; do
for word2 in [$2]; do
if test "$word1" = "$word2"; then
ac_var_match_word="yes"
fi
@ -768,9 +850,9 @@ dnl from VALUE is removed from VARNAME when present.
AC_DEFUN([CARES_VAR_STRIP], [
ac_var_stripped=""
for word1 in "$[$1]"; do
for word1 in $[$1]; do
ac_var_strip_word="no"
for word2 in "[$2]"; do
for word2 in [$2]; do
if test "$word1" = "$word2"; then
ac_var_strip_word="yes"
fi

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