aboutsummaryrefslogtreecommitdiff
path: root/ares/m4
diff options
context:
space:
mode:
authorYang Tse <yangsita@gmail.com>2008-10-09 19:55:18 +0000
committerYang Tse <yangsita@gmail.com>2008-10-09 19:55:18 +0000
commit98416a4fabda6695b0393bd7ffcf53555be6f7f5 (patch)
tree8103e31d37d38e62ff7d5294304b925617e4013b /ares/m4
parentfad3288d20fba6af71fa9bdfb851fe92c3aa2f04 (diff)
configure will also warn on 'strict compiler warning' rejected options
Diffstat (limited to 'ares/m4')
-rw-r--r--ares/m4/cares-compilers.m4272
1 files changed, 177 insertions, 95 deletions
diff --git a/ares/m4/cares-compilers.m4 b/ares/m4/cares-compilers.m4
index 00f427ade..5b5f43d8d 100644
--- a/ares/m4/cares-compilers.m4
+++ b/ares/m4/cares-compilers.m4
@@ -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);
@@ -338,6 +381,10 @@ AC_DEFUN([CARES_SET_COMPILER_BASIC_OPTS], [
#
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"
tmp_CPPFLAGS=""
@@ -581,100 +628,135 @@ AC_DEFUN([CARES_SET_COMPILER_WARNING_OPTS], [
AC_REQUIRE([CARES_CHECK_OPTION_WARNINGS])dnl
AC_REQUIRE([CARES_CHECK_COMPILER])dnl
#
- if test "$compiler_id" = "DECC"; then
- if test "$want_warnings" = "yes"; then
- dnl Select a higher warning level than default level2
- CFLAGS="$CFLAGS -msg_enable level3"
- fi
- fi
- #
- if test "$compiler_id" = "GNUC"; then
+ if test "$compiler_id" != "unknown"; then
#
- # FIXME: Some of these warnings should be changed into errors
- # and moved to CARES-SET-COMPILER-BASIC-OPTS
+ tmp_save_CPPFLAGS="$CPPFLAGS"
+ tmp_save_CFLAGS="$CFLAGS"
+ tmp_CPPFLAGS=""
+ tmp_CFLAGS=""
#
- if test "$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 -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"
- 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"
- fi
- if test "$compiler_num" -ge "296"; then
- dnl gcc 2.96 or later
- WARN="$WARN -Wfloat-equal"
- fi
- if test "$compiler_num" -gt "296"; then
- dnl this option does not exist in 2.96
- WARN="$WARN -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.
- dnl Also, on gcc 4.0.X it is totally unbearable and complains all
- 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"
- 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: $WARN])
- fi
- fi
- #
- if test "$compiler_id" = "HPUXC"; then
- if test "$want_warnings" = "yes"; then
- dnl Issue all warnings
- CFLAGS="$CFLAGS +w1"
- fi
- fi
- #
- 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"
- dnl Perform extra compile-time code checking
- CPPFLAGS="$CPPFLAGS -Wcheck"
- fi
- fi
- fi
- #
- if test "$compiler_id" = "SGIC"; then
- if test "$want_warnings" = "yes"; then
- dnl Perform stricter semantic and lint-like checks
- CFLAGS="$CFLAGS -fullwarn"
- fi
- fi
- #
- if test "$compiler_id" = "SUNC"; then
- if test "$want_warnings" = "yes"; then
- dnl Perform stricter semantic and lint-like checks
- CFLAGS="$CFLAGS -v"
+ case "$compiler_id" in
+ #
+ DECC)
+ #
+ if test "$want_warnings" = "yes"; then
+ dnl Select a higher warning level than default level2
+ tmp_CFLAGS="$tmp_CFLAGS -msg_enable level3"
+ fi
+ ;;
+ #
+ GNUC)
+ #
+ if test "$want_warnings" = "yes"; then
+ dnl Set of options we believe *ALL* gcc versions support:
+ tmp_CFLAGS="$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 "$compiler_num" -ge "207"; then
+ dnl gcc 2.7 or later
+ tmp_CFLAGS="$tmp_CFLAGS -Wmissing-declarations"
+ fi
+ if test "$compiler_num" -gt "295"; then
+ dnl only if the compiler is newer than 2.95 since we got lots of
+ dnl "`_POSIX_C_SOURCE' is not defined" in system headers with
+ dnl gcc 2.95.4 on FreeBSD 4.9!
+ tmp_CFLAGS="$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
+ tmp_CFLAGS="$tmp_CFLAGS -Wfloat-equal"
+ fi
+ if test "$compiler_num" -gt "296"; then
+ dnl this option does not exist in 2.96
+ tmp_CFLAGS="$tmp_CFLAGS -Wno-format-nonliteral"
+ fi
+ dnl -Wunreachable-code seems totally unreliable on my gcc 3.3.2 on
+ dnl on i686-Linux as it gives us heaps with false positives.
+ dnl Also, on gcc 4.0.X it is totally unbearable and complains all
+ dnl over making it unusable for generic purposes. Let's not use it.
+ if test "$compiler_num" -ge "303"; then
+ dnl gcc 3.3 and later
+ tmp_CFLAGS="$tmp_CFLAGS -Wendif-labels -Wstrict-prototypes"
+ fi
+ if test "$compiler_num" -ge "304"; then
+ dnl gcc 3.4 and later
+ tmp_CFLAGS="$tmp_CFLAGS -Wdeclaration-after-statement"
+ fi
+ fi
+ ;;
+ #
+ HPUXC)
+ #
+ if test "$want_warnings" = "yes"; then
+ dnl Issue all warnings
+ tmp_CFLAGS="$tmp_CFLAGS +w1"
+ fi
+ ;;
+ #
+ IBMC)
+ #
+ dnl Placeholder
+ tmp_CFLAGS="$tmp_CFLAGS"
+ ;;
+ #
+ ICC_unix)
+ #
+ if test "$want_warnings" = "yes"; then
+ if test "$compiler_num" -gt "600"; then
+ dnl Show errors, warnings, and remarks
+ tmp_CPPFLAGS="$tmp_CPPFLAGS -Wall"
+ dnl Perform extra compile-time code checking
+ tmp_CPPFLAGS="$tmp_CPPFLAGS -Wcheck"
+ fi
+ fi
+ ;;
+ #
+ ICC_windows)
+ #
+ dnl Placeholder
+ tmp_CFLAGS="$tmp_CFLAGS"
+ ;;
+ #
+ SGIC)
+ #
+ if test "$want_warnings" = "yes"; then
+ dnl Perform stricter semantic and lint-like checks
+ tmp_CFLAGS="$tmp_CFLAGS -fullwarn"
+ fi
+ ;;
+ #
+ SUNC)
+ #
+ if test "$want_warnings" = "yes"; then
+ dnl Perform stricter semantic and lint-like checks
+ 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