Hi! In glibc, we can't make configure decisions based on the host system's C library, as we must be independent of it -- we're about to build the C library at this time. But, $ac_includes_default (as used via AC_INCLUDES_DEFAULT by default) in several autoconf tests (headers, etc.) contains #include <[...]> for several C library headers -- but this will pick up the host system's from /usr/include/. Is there/can there be an officially sanctioned way for doing the following; emptying ac_includes_default? diff --git a/configure.in b/configure.in index fbc64b9..fbeab8e 100644 --- a/configure.in +++ b/configure.in @@ -6,6 +6,12 @@ AC_CONFIG_SRCDIR([include/features.h]) AC_CONFIG_HEADERS([config.h]) AC_CONFIG_AUX_DIR([scripts]) +# Do not make decisions based on the host system's C library, as we must be +# independent of it. +AC_DEFUN([_AC_INCLUDES_DEFAULT_REQUIREMENTS], + [m4_divert_text([DEFAULTS], + [ac_includes_default='/* none */'])]) + dnl This is here so we can set $subdirs directly based on configure fragments. AC_CONFIG_SUBDIRS() Instead of mucking with autoconf's internals, can we for example get a AC_INCLUDES_DEFAULT_INIT([...]), or similar? Together with the following hunk: diff --git a/aclocal.m4 b/aclocal.m4 index 6ad3c87..5d441a7 100644 --- a/aclocal.m4 +++ b/aclocal.m4 @@ -5,6 +5,7 @@ dnl AC_REQUIREs or AC_BEFOREs duplicating their code. dnl define([GLIBC_PROVIDES], [dnl AC_PROVIDE([AC_CONFIG_AUX_DIR_DEFAULT])dnl +AC_PROVIDE([_AC_INCLUDES_DEFAULT_REQUIREMENTS])dnl AC_PROVIDE([AC_CONFIG_SUBDIRS])dnl AC_PROVIDE([_AS_ECHO_N_PREPARE])dnl AC_PROVIDE([_AS_ECHO_PREPARE])dnl ..., this results in the following configure simplifications/corrections in glibc: diff --git a/configure b/configure index 6cf85e5..1576b46 100755 --- a/configure +++ b/configure @@ -559,42 +559,7 @@ PACKAGE_URL='http://www.gnu.org/software/c-library/' ac_unique_file="include/features.h" enable_option_checking=no -# Factoring default headers for most tests. -ac_includes_default="\ -#include <stdio.h> -#ifdef HAVE_SYS_TYPES_H -# include <sys/types.h> -#endif -#ifdef HAVE_SYS_STAT_H -# include <sys/stat.h> -#endif -#ifdef STDC_HEADERS -# include <stdlib.h> -# include <stddef.h> -#else -# ifdef HAVE_STDLIB_H -# include <stdlib.h> -# endif -#endif -#ifdef HAVE_STRING_H -# if !defined STDC_HEADERS && defined HAVE_MEMORY_H -# include <memory.h> -# endif -# include <string.h> -#endif -#ifdef HAVE_STRINGS_H -# include <strings.h> -#endif -#ifdef HAVE_INTTYPES_H -# include <inttypes.h> -#endif -#ifdef HAVE_STDINT_H -# include <stdint.h> -#endif -#ifdef HAVE_UNISTD_H -# include <unistd.h> -#endif" - +ac_includes_default='/* none */' ac_subst_vars='LTLIBOBJS LIBOBJS RELEASE @@ -626,8 +591,6 @@ libc_cv_slibdir old_glibc_headers libc_cv_gcc_unwind_find_fde sizeof_long_double -EGREP -GREP have_selinux have_libcap have_libaudit @@ -1935,37 +1898,6 @@ rm -f conftest.val as_fn_set_status $ac_retval } # ac_fn_c_compute_int - -# ac_fn_c_check_header_compile LINENO HEADER VAR INCLUDES -# ------------------------------------------------------- -# Tests whether HEADER exists and can be compiled using the include files in -# INCLUDES, setting the cache variable VAR accordingly. -ac_fn_c_check_header_compile () -{ - as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack - { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $2" >&5 -$as_echo_n "checking for $2... " >&6; } -if eval "test \"\${$3+set}\"" = set; then : - $as_echo_n "(cached) " >&6 -else - cat confdefs.h - <<_ACEOF >conftest.$ac_ext -/* end confdefs.h. */ -$4 -#include <$2> -_ACEOF -if ac_fn_c_try_compile "$LINENO"; then : - eval "$3=yes" -else - eval "$3=no" -fi -rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext -fi -eval ac_res=\$$3 - { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5 -$as_echo "$ac_res" >&6; } - eval $as_lineno_stack; test "x$as_lineno_stack" = x && { as_lineno=; unset as_lineno;} - -} # ac_fn_c_check_header_compile cat >config.log <<_ACEOF This file contains any messages produced by compilers while running configure, to aid debugging if configure makes a mistake. @@ -2351,6 +2283,10 @@ ac_configure="$SHELL $ac_aux_dir/configure" # Please don't use this var. +# Do not make decisions based on the host system's C library, as we must be +# independent of it. + + subdirs="$subdirs " @@ -7323,265 +7259,6 @@ fi -{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for grep that handles long lines and -e" >&5 -$as_echo_n "checking for grep that handles long lines and -e... 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"no acceptable egrep could be found in $PATH$PATH_SEPARATOR/usr/xpg4/bin" "$LINENO" 5 - fi -else - ac_cv_path_EGREP=$EGREP -fi - - fi -fi -{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_path_EGREP" >&5 -$as_echo "$ac_cv_path_EGREP" >&6; } - EGREP="$ac_cv_path_EGREP" - - -{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for ANSI C header files" >&5 -$as_echo_n "checking for ANSI C header files... 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'A' + ((c) - 'a') : (c)) -#else -# define ISLOWER(c) \ - (('a' <= (c) && (c) <= 'i') \ - || ('j' <= (c) && (c) <= 'r') \ - || ('s' <= (c) && (c) <= 'z')) -# define TOUPPER(c) (ISLOWER(c) ? ((c) | 0x40) : (c)) -#endif - -#define XOR(e, f) (((e) && !(f)) || (!(e) && (f))) -int -main () -{ - int i; - for (i = 0; i < 256; i++) - if (XOR (islower (i), ISLOWER (i)) - || toupper (i) != TOUPPER (i)) - return 2; - return 0; -} -_ACEOF -if ac_fn_c_try_run "$LINENO"; then : - -else - ac_cv_header_stdc=no -fi -rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext \ - conftest.$ac_objext conftest.beam conftest.$ac_ext -fi - -fi -fi -{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_header_stdc" >&5 -$as_echo "$ac_cv_header_stdc" >&6; } -if test $ac_cv_header_stdc = yes; then - -$as_echo "#define STDC_HEADERS 1" >>confdefs.h - -fi - -# On IRIX 5.3, sys/types and inttypes.h are conflicting. -for ac_header in sys/types.h sys/stat.h stdlib.h string.h memory.h strings.h \ - inttypes.h stdint.h unistd.h -do : - as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh` -ac_fn_c_check_header_compile "$LINENO" "$ac_header" "$as_ac_Header" "$ac_includes_default -" -if eval test \"x\$"$as_ac_Header"\" = x"yes"; then : - cat >>confdefs.h <<_ACEOF -#define `$as_echo "HAVE_$ac_header" | $as_tr_cpp` 1 -_ACEOF - -fi - -done - - # The cast to long int works around a bug in the HP C Compiler # version HP92453-01 B.11.11.23709.GP, which incorrectly rejects # declarations like `int a3[[(sizeof (unsigned char)) >= 0]];'. diff --git a/sysdeps/i386/configure b/sysdeps/i386/configure index adffe3f..c7417ca 100644 --- a/sysdeps/i386/configure +++ b/sysdeps/i386/configure @@ -16,23 +16,6 @@ as_fn_exit () as_fn_set_status $1 exit $1 } # as_fn_exit -# as_fn_arith ARG... -# ------------------ -# Perform arithmetic evaluation on the ARGs, and store the result in the -# global $as_val. Take advantage of shells that can avoid forks. The arguments -# must be portable across $(()) and expr. -if (eval "test \$(( 1 + 1 )) = 2") 2>/dev/null; then : - eval 'as_fn_arith () - { - as_val=$(( $* )) - }' -else - as_fn_arith () - { - as_val=`expr "$@" || test $? -eq 1` - } -fi # as_fn_arith - if expr a : '\(a\)' >/dev/null 2>&1 && test "X`expr 00001 : '.*\(...\)'`" = X001; then as_expr=expr @@ -97,42 +80,6 @@ $as_echo X/"$0" | exit } -# Factoring default headers for most tests. -ac_includes_default="\ -#include <stdio.h> -#ifdef HAVE_SYS_TYPES_H -# include <sys/types.h> -#endif -#ifdef HAVE_SYS_STAT_H -# include <sys/stat.h> -#endif -#ifdef STDC_HEADERS -# include <stdlib.h> -# include <stddef.h> -#else -# ifdef HAVE_STDLIB_H -# include <stdlib.h> -# endif -#endif -#ifdef HAVE_STRING_H -# if !defined STDC_HEADERS && defined HAVE_MEMORY_H -# include <memory.h> -# endif -# include <string.h> -#endif -#ifdef HAVE_STRINGS_H -# include <strings.h> -#endif -#ifdef HAVE_INTTYPES_H -# include <inttypes.h> -#endif -#ifdef HAVE_STDINT_H -# include <stdint.h> -#endif -#ifdef HAVE_UNISTD_H -# include <unistd.h> -#endif" - # ac_fn_c_try_compile LINENO # -------------------------- @@ -295,343 +242,11 @@ fi eval $as_lineno_stack; test "x$as_lineno_stack" = x && { as_lineno=; unset as_lineno;} } # ac_fn_c_check_header_mongrel - -# ac_fn_c_try_run LINENO -# ---------------------- -# Try to link conftest.$ac_ext, and return whether this succeeded. 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'A' + ((c) - 'a') : (c)) -#else -# define ISLOWER(c) \ - (('a' <= (c) && (c) <= 'i') \ - || ('j' <= (c) && (c) <= 'r') \ - || ('s' <= (c) && (c) <= 'z')) -# define TOUPPER(c) (ISLOWER(c) ? ((c) | 0x40) : (c)) -#endif - -#define XOR(e, f) (((e) && !(f)) || (!(e) && (f))) -int -main () -{ - int i; - for (i = 0; i < 256; i++) - if (XOR (islower (i), ISLOWER (i)) - || toupper (i) != TOUPPER (i)) - return 2; - return 0; -} -_ACEOF -if ac_fn_c_try_run "$LINENO"; then : - -else - ac_cv_header_stdc=no -fi -rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext \ - conftest.$ac_objext conftest.beam conftest.$ac_ext -fi - -fi -fi -{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_header_stdc" >&5 -$as_echo "$ac_cv_header_stdc" >&6; } -if test $ac_cv_header_stdc = yes; then - -$as_echo "#define STDC_HEADERS 1" >>confdefs.h - -fi - -# On IRIX 5.3, sys/types and inttypes.h are conflicting. -for ac_header in sys/types.h sys/stat.h stdlib.h string.h memory.h strings.h \ - inttypes.h stdint.h unistd.h -do : - as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh` -ac_fn_c_check_header_compile "$LINENO" "$ac_header" "$as_ac_Header" "$ac_includes_default -" -if eval test \"x\$"$as_ac_Header"\" = x"yes"; then : - cat >>confdefs.h <<_ACEOF -#define `$as_echo "HAVE_$ac_header" | $as_tr_cpp` 1 -_ACEOF - -fi - -done - - ac_fn_c_check_header_mongrel "$LINENO" "cpuid.h" "ac_cv_header_cpuid_h" "$ac_includes_default" if test "x$ac_cv_header_cpuid_h" = x""yes; then : Grüße, Thomas
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