Changelog
+Yang Tse (20 Jun 2008)
+- Modified configuration script to actually verify if the compiler is good
+ enough at detecting compilation errors or at least it has been properly
+ configured to do so. Configuration heavily depends on this capability, so
+ if this compiler sanity check fails the configuration process will now fail.
+
Daniel Stenberg (20 Jun 2008)
- Phil Pellouchoud found a case where libcurl built with NSS failed to
handshake with a SSLv2 server, and it turned out to be because it didn't
###########################################################################
+dnl CURL_CHECK_COMPILER_HALT_ON_ERROR
+dnl -------------------------------------------------
+dnl Verifies if the compiler actually halts after the
+dnl compilation phase without generating any object
+dnl code file, when the source compiles with errors.
+
+AC_DEFUN([CURL_CHECK_COMPILER_HALT_ON_ERROR], [
+ AC_MSG_CHECKING([if compiler halts on compilation errors])
+ AC_COMPILE_IFELSE([
+ AC_LANG_PROGRAM([[
+ ]],[[
+ force compilation error
+ ]])
+ ],[
+ AC_MSG_RESULT([no])
+ AC_MSG_ERROR([compiler does not halt on compilation errors.])
+ ],[
+ AC_MSG_RESULT([yes])
+ ])
+])
+
+
+dnl CURL_CHECK_COMPILER_ARRAY_SIZE_NEGATIVE
+dnl -------------------------------------------------
+dnl Verifies if the compiler actually halts after the
+dnl compilation phase without generating any object
+dnl code file, when the source code tries to define a
+dnl type for a constant array with negative dimension.
+
+AC_DEFUN([CURL_CHECK_COMPILER_ARRAY_SIZE_NEGATIVE], [
+ AC_REQUIRE([CURL_CHECK_COMPILER_HALT_ON_ERROR])dnl
+ AC_MSG_CHECKING([if compiler halts on negative sized arrays])
+ AC_COMPILE_IFELSE([
+ AC_LANG_PROGRAM([[
+ typedef char bad_t[sizeof(char) == sizeof(int) ? -1 : -1 ];
+ ]],[[
+ bad_t dummy;
+ ]])
+ ],[
+ AC_MSG_RESULT([no])
+ AC_MSG_ERROR([compiler does not halt on negative sized arrays.])
+ ],[
+ AC_MSG_RESULT([yes])
+ ])
+])
+
+
+dnl CURL_CHECK_DEF(SYMBOL, [INCLUDES], [SILENT])
+dnl -------------------------------------------------
+dnl Use the C preprocessor to find out if the given object-style symbol
+dnl is defined and get its expansion. This macro will not use default
+dnl includes even if no INCLUDES argument is given. This macro will run
+dnl silently when invoked with three arguments.
+
+AC_DEFUN([CURL_CHECK_DEF], [
+ AS_VAR_PUSHDEF([ac_HaveDef], [curl_cv_have_def_$1])dnl
+ AS_VAR_PUSHDEF([ac_Def], [curl_cv_def_$1])dnl
+ ifelse($3,,[AC_MSG_CHECKING([for preprocessor definition of $1])])
+ tmp_exp=""
+ AC_PREPROC_IFELSE([
+ AC_LANG_SOURCE(
+ifelse($2,,,[$2])[[
+#ifdef $1
+CURL_DEF_TOKEN $1
+#endif
+ ]])
+ ],[
+ tmp_exp=`eval "$ac_cpp conftest.$ac_ext" 2>/dev/null | \
+ "$GREP" CURL_DEF_TOKEN 2>/dev/null | \
+ "$SED" 's/.*CURL_DEF_TOKEN[[ ]]//' 2>/dev/null | \
+ "$SED" 'q' 2>/dev/null`
+ if test "$tmp_exp" = "$1"; then
+ tmp_exp=""
+ fi
+ ])
+ if test -z "$tmp_exp"; then
+ AS_VAR_SET([ac_HaveDef], [no])
+ ifelse($3,,[AC_MSG_RESULT([no])])
+ else
+ AS_VAR_SET([ac_HaveDef], [yes])
+ AS_VAR_SET([ac_Def], [$tmp_exp])
+ ifelse($3,,[AC_MSG_RESULT([$tmp_exp])])
+ fi
+ AS_VAR_POPDEF([ac_Def])dnl
+ AS_VAR_POPDEF([ac_HaveDef])dnl
+])
+
+
dnl CURL_CHECK_HEADER_WINDOWS
dnl -------------------------------------------------
dnl Check for compilable and valid windows.h header
+dnl CURL_CHECK_COMPILER_HALT_ON_ERROR
+dnl -------------------------------------------------
+dnl Verifies if the compiler actually halts after the
+dnl compilation phase without generating any object
+dnl code file, when the source compiles with errors.
+
+AC_DEFUN([CURL_CHECK_COMPILER_HALT_ON_ERROR], [
+ AC_MSG_CHECKING([if compiler halts on compilation errors])
+ AC_COMPILE_IFELSE([
+ AC_LANG_PROGRAM([[
+ ]],[[
+ force compilation error
+ ]])
+ ],[
+ AC_MSG_RESULT([no])
+ AC_MSG_ERROR([compiler does not halt on compilation errors.])
+ ],[
+ AC_MSG_RESULT([yes])
+ ])
+])
+
+
+dnl CURL_CHECK_COMPILER_ARRAY_SIZE_NEGATIVE
+dnl -------------------------------------------------
+dnl Verifies if the compiler actually halts after the
+dnl compilation phase without generating any object
+dnl code file, when the source code tries to define a
+dnl type for a constant array with negative dimension.
+
+AC_DEFUN([CURL_CHECK_COMPILER_ARRAY_SIZE_NEGATIVE], [
+ AC_REQUIRE([CURL_CHECK_COMPILER_HALT_ON_ERROR])dnl
+ AC_MSG_CHECKING([if compiler halts on negative sized arrays])
+ AC_COMPILE_IFELSE([
+ AC_LANG_PROGRAM([[
+ typedef char bad_t[sizeof(char) == sizeof(int) ? -1 : -1 ];
+ ]],[[
+ bad_t dummy;
+ ]])
+ ],[
+ AC_MSG_RESULT([no])
+ AC_MSG_ERROR([compiler does not halt on negative sized arrays.])
+ ],[
+ AC_MSG_RESULT([yes])
+ ])
+])
+
+
+dnl CURL_CHECK_DEF(SYMBOL, [INCLUDES], [SILENT])
+dnl -------------------------------------------------
+dnl Use the C preprocessor to find out if the given object-style symbol
+dnl is defined and get its expansion. This macro will not use default
+dnl includes even if no INCLUDES argument is given. This macro will run
+dnl silently when invoked with three arguments.
+
+AC_DEFUN([CURL_CHECK_DEF], [
+ AS_VAR_PUSHDEF([ac_HaveDef], [curl_cv_have_def_$1])dnl
+ AS_VAR_PUSHDEF([ac_Def], [curl_cv_def_$1])dnl
+ ifelse($3,,[AC_MSG_CHECKING([for preprocessor definition of $1])])
+ tmp_exp=""
+ AC_PREPROC_IFELSE([
+ AC_LANG_SOURCE(
+ifelse($2,,,[$2])[[
+#ifdef $1
+CURL_DEF_TOKEN $1
+#endif
+ ]])
+ ],[
+ tmp_exp=`eval "$ac_cpp conftest.$ac_ext" 2>/dev/null | \
+ "$GREP" CURL_DEF_TOKEN 2>/dev/null | \
+ "$SED" 's/.*CURL_DEF_TOKEN[[ ]]//' 2>/dev/null | \
+ "$SED" 'q' 2>/dev/null`
+ if test "$tmp_exp" = "$1"; then
+ tmp_exp=""
+ fi
+ ])
+ if test -z "$tmp_exp"; then
+ AS_VAR_SET([ac_HaveDef], [no])
+ ifelse($3,,[AC_MSG_RESULT([no])])
+ else
+ AS_VAR_SET([ac_HaveDef], [yes])
+ AS_VAR_SET([ac_Def], [$tmp_exp])
+ ifelse($3,,[AC_MSG_RESULT([$tmp_exp])])
+ fi
+ AS_VAR_POPDEF([ac_Def])dnl
+ AS_VAR_POPDEF([ac_HaveDef])dnl
+])
+
+
dnl CURL_CHECK_HEADER_WINDOWS
dnl -------------------------------------------------
dnl Check for compilable and valid windows.h header
dnl **********************************************************************
CURL_DETECT_ICC([CFLAGS="$CFLAGS -we 147"])
-dnl **********************************************************************
-dnl Make sure that our checks for headers windows.h winsock.h winsock2.h
-dnl and ws2tcpip.h take precedence over any other further checks which
-dnl could be done later using AC_CHECK_HEADER or AC_CHECK_HEADERS for
-dnl this specific header files. And do them before its results are used.
-dnl **********************************************************************
-
-CURL_CHECK_HEADER_WINDOWS
-CURL_CHECK_NATIVE_WINDOWS
-case X-"$ac_cv_native_windows" in
- X-yes)
- CURL_CHECK_HEADER_WINSOCK
- CURL_CHECK_HEADER_WINSOCK2
- CURL_CHECK_HEADER_WS2TCPIP
- ;;
- *)
- ac_cv_header_winsock_h="no"
- ac_cv_header_winsock2_h="no"
- ac_cv_header_ws2tcpip_h="no"
- ;;
-esac
-
dnl **********************************************************************
dnl platform/compiler/architecture specific checks/flags
dnl **********************************************************************
#
esac
+CURL_CHECK_DEF([__xlc__])
+if test "$curl_cv_have_def___xlc__" = "yes"; then
+ dnl Force xlc to stop after the compilation phase, and not
+ dnl generate object code file when compilation has errors.
+ CFLAGS="$CFLAGS -qhalt=e"
+fi
+
+CURL_CHECK_COMPILER_HALT_ON_ERROR
+CURL_CHECK_COMPILER_ARRAY_SIZE_NEGATIVE
+
+dnl **********************************************************************
+dnl Compilation based checks should not be done before this point.
+dnl **********************************************************************
+
+dnl **********************************************************************
+dnl Make sure that our checks for headers windows.h winsock.h winsock2.h
+dnl and ws2tcpip.h take precedence over any other further checks which
+dnl could be done later using AC_CHECK_HEADER or AC_CHECK_HEADERS for
+dnl this specific header files. And do them before its results are used.
+dnl **********************************************************************
+
+CURL_CHECK_HEADER_WINDOWS
+CURL_CHECK_NATIVE_WINDOWS
+case X-"$ac_cv_native_windows" in
+ X-yes)
+ CURL_CHECK_HEADER_WINSOCK
+ CURL_CHECK_HEADER_WINSOCK2
+ CURL_CHECK_HEADER_WS2TCPIP
+ ;;
+ *)
+ ac_cv_header_winsock_h="no"
+ ac_cv_header_winsock2_h="no"
+ ac_cv_header_ws2tcpip_h="no"
+ ;;
+esac
+
dnl **********************************************************************
dnl Checks for libraries.
dnl **********************************************************************
dnl the optimizer assumes that pointers can only point to
dnl an object of the same type.
CFLAGS="$CFLAGS -qnoansialias"
- dnl Force AIX xlc to stop after the compilation phase, and not
- dnl generate object code, when the source compiles with errors.
- CFLAGS="$CFLAGS -qhalt=e"
)
fi
dnl check if there's a way to force code inline
AC_C_INLINE
-dnl **********************************************************************
-dnl Make sure that our checks for headers windows.h winsock.h winsock2.h
-dnl and ws2tcpip.h take precedence over any other further checks which
-dnl could be done later using AC_CHECK_HEADER or AC_CHECK_HEADERS for
-dnl this specific header files. And do them before its results are used.
-dnl **********************************************************************
-
-CURL_CHECK_HEADER_WINDOWS
-CURL_CHECK_NATIVE_WINDOWS
-case X-"$ac_cv_native_windows" in
- X-yes)
- CURL_CHECK_HEADER_WINSOCK
- CURL_CHECK_HEADER_WINSOCK2
- CURL_CHECK_HEADER_WS2TCPIP
- CURL_CHECK_HEADER_WINLDAP
- CURL_CHECK_HEADER_WINBER
- ;;
- *)
- ac_cv_header_winsock_h="no"
- ac_cv_header_winsock2_h="no"
- ac_cv_header_ws2tcpip_h="no"
- ac_cv_header_winldap_h="no"
- ac_cv_header_winber_h="no"
- ;;
-esac
-
dnl **********************************************************************
dnl platform/compiler/architecture specific checks/flags
dnl **********************************************************************
#
esac
+CURL_CHECK_DEF([__xlc__])
+if test "$curl_cv_have_def___xlc__" = "yes"; then
+ dnl Force xlc to stop after the compilation phase, and not
+ dnl generate object code file when compilation has errors.
+ CFLAGS="$CFLAGS -qhalt=e"
+fi
+
+CURL_CHECK_COMPILER_HALT_ON_ERROR
+CURL_CHECK_COMPILER_ARRAY_SIZE_NEGATIVE
+
+dnl **********************************************************************
+dnl Compilation based checks should not be done before this point.
+dnl **********************************************************************
+
+dnl **********************************************************************
+dnl Make sure that our checks for headers windows.h winsock.h winsock2.h
+dnl and ws2tcpip.h take precedence over any other further checks which
+dnl could be done later using AC_CHECK_HEADER or AC_CHECK_HEADERS for
+dnl this specific header files. And do them before its results are used.
+dnl **********************************************************************
+
+CURL_CHECK_HEADER_WINDOWS
+CURL_CHECK_NATIVE_WINDOWS
+case X-"$ac_cv_native_windows" in
+ X-yes)
+ CURL_CHECK_HEADER_WINSOCK
+ CURL_CHECK_HEADER_WINSOCK2
+ CURL_CHECK_HEADER_WS2TCPIP
+ CURL_CHECK_HEADER_WINLDAP
+ CURL_CHECK_HEADER_WINBER
+ ;;
+ *)
+ ac_cv_header_winsock_h="no"
+ ac_cv_header_winsock2_h="no"
+ ac_cv_header_ws2tcpip_h="no"
+ ac_cv_header_winldap_h="no"
+ ac_cv_header_winber_h="no"
+ ;;
+esac
+
dnl ************************************************************
dnl switch off particular protocols
dnl
dnl the optimizer assumes that pointers can only point to
dnl an object of the same type.
CFLAGS="$CFLAGS -qnoansialias"
- dnl Force AIX xlc to stop after the compilation phase, and not
- dnl generate object code, when the source compiles with errors.
- CFLAGS="$CFLAGS -qhalt=e"
)
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