Fix trailing space.

[thirdparty/glibc.git] / configure.ac

diff --git a/configure.ac b/configure.ac
index b2c4b1fab86e7c5438c8018b004be685380bb747..7e9383a7f0b036ff7f558b1d436906245aa1941d 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -50,9 +50,18 @@ if test $host != $build; then
 fi
 AC_SUBST(cross_compiling)
 AC_PROG_CPP
+AC_CHECK_TOOL(READELF, readelf, false)
+
 # We need the C++ compiler only for testing.
 AC_PROG_CXX
-AC_CHECK_TOOL(READELF, readelf, false)
+# It's useless to us if it can't link programs (e.g. missing -lstdc++).
+AC_CACHE_CHECK([whether $CXX can link programs], libc_cv_cxx_link_ok, [dnl
+AC_LANG_PUSH([C++])
+AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],
+              [libc_cv_cxx_link_ok=yes],
+              [libc_cv_cxx_link_ok=no])
+AC_LANG_POP([C++])])
+AS_IF([test $libc_cv_cxx_link_ok != yes], [CXX=])
 
 if test "`cd $srcdir; /bin/pwd`" = "`/bin/pwd`"; then
   AC_MSG_ERROR([you must configure in a separate build directory])
@@ -253,6 +262,13 @@ AC_ARG_ENABLE([all-warnings],
              [])
 AC_SUBST(all_warnings)
 
+AC_ARG_ENABLE([werror],
+             AC_HELP_STRING([--disable-werror],
+                            [do not build with -Werror]),
+             [enable_werror=$enableval],
+             [enable_werror=yes])
+AC_SUBST(enable_werror)
+
 AC_ARG_ENABLE([multi-arch],
              AC_HELP_STRING([--enable-multi-arch],
                             [enable single DSO with optimizations for multiple architectures]),
@@ -353,6 +369,24 @@ if test "$build_pt_chown" = yes; then
   AC_DEFINE(HAVE_PT_CHOWN)
 fi
 
+# The abi-tags file uses a fairly simplistic model for name recognition that
+# can't distinguish i486-pc-linux-gnu fully from i486-pc-gnu.  So we mutate a
+# $host_os of `gnu*' here to be `gnu-gnu*' just so that it can tell.
+# This doesn't get used much beyond that, so it's fairly safe.
+case "$host_os" in
+linux*)
+  ;;
+gnu*)
+  host_os=`echo $host_os | sed -e 's/gnu/gnu-gnu/'`
+  ;;
+esac
+
+AC_ARG_ENABLE([mathvec],
+             [AS_HELP_STRING([--enable-mathvec],
+             [Enable building and installing mathvec @<:@default depends on architecture@:>@])],
+             [build_mathvec=$enableval],
+             [build_mathvec=notset])
+
 # We keep the original values in `$config_*' and never modify them, so we
 # can write them unchanged into config.make.  Everything else uses
 # $machine, $vendor, and $os, and changes them whenever convenient.
@@ -384,12 +418,13 @@ AC_ARG_WITH([cpu],
   esac
 ])
 
+# An preconfigure script can set this when it wants to disable the sanity
+# check below.
+libc_config_ok=no
+
 dnl Let sysdeps/*/preconfigure act here, like they can in add-ons.
 LIBC_PRECONFIGURE([$srcdir], [for sysdeps])
 
-# An add-on can set this when it wants to disable the sanity check below.
-libc_config_ok=no
-
 dnl Having this here, though empty, makes sure that if add-ons' fragments
 dnl do AC_CONFIG_SUBDIRS([some-dir]), which just sets $subdirs, then
 dnl our AC_OUTPUT will actually use it.
@@ -922,7 +957,7 @@ AC_CHECK_PROG_VER(MSGFMT, gnumsgfmt gmsgfmt msgfmt, --version,
   MSGFMT=: aux_missing="$aux_missing msgfmt")
 AC_CHECK_PROG_VER(MAKEINFO, makeinfo, --version,
   [GNU texinfo.* \([0-9][0-9.]*\)],
-  [4.[5-9]*|4.[1-9][0-9]*|[5-9].*],
+  [4.[7-9]*|4.[1-9][0-9]*|[5-9].*],
   MAKEINFO=: aux_missing="$aux_missing makeinfo")
 AC_CHECK_PROG_VER(SED, sed, --version,
   [GNU sed[^0-9]* \([0-9]*\.[0-9.]*\)],
@@ -1041,7 +1076,10 @@ if test "$PERL" != no &&
 fi
 AC_PATH_PROG(INSTALL_INFO, install-info, no,
             $PATH:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin)
-AC_PATH_PROG(BISON, bison, no, $PATH:/usr/local/bin:/usr/bin:/bin)
+AC_CHECK_PROG_VER(BISON, bison, --version,
+                 [bison (GNU Bison) \([0-9]*\.[0-9.]*\)],
+                 [2.7*|[3-9].*|[1-9][0-9]*],
+                 BISON=no)
 
 AC_CACHE_CHECK(for libc-friendly stddef.h, libc_cv_friendly_stddef, [dnl
 AC_TRY_COMPILE(dnl
@@ -1188,6 +1226,29 @@ EOF
   fi
 fi
 
+if test $libc_cv_visibility_attribute = yes; then
+  AC_CACHE_CHECK(linker support for protected data symbol,
+                libc_cv_protected_data,
+                [cat > conftest.c <<EOF
+                 int bar __attribute__ ((visibility ("protected"))) = 1;
+EOF
+                 libc_cv_protected_data=no
+                 if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles -fPIC -shared conftest.c -o conftest.so); then
+                   cat > conftest.c <<EOF
+                   extern int bar;
+                   int main (void) { return bar; }
+EOF
+                   if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles conftest.c -o conftest conftest.so); then
+                     libc_cv_protected_data=yes
+                   fi
+                 fi
+                 rm -f conftest.*
+                ])
+else
+  libc_cv_protected_data=no
+fi
+AC_SUBST(libc_cv_protected_data)
+
 if test $libc_cv_visibility_attribute = yes; then
   AC_CACHE_CHECK(for broken __attribute__((visibility())),
                 libc_cv_broken_visibility_attribute,
@@ -1939,6 +2000,11 @@ for dir in $sysnames; do
   fi
 done
 
+if test x"$build_mathvec" = xnotset; then
+  build_mathvec=no
+fi
+LIBC_CONFIG_VAR([build-mathvec], [$build_mathvec])
+
 AC_SUBST(libc_extra_cflags)
 AC_SUBST(libc_extra_cppflags)
 
@@ -2009,6 +2075,19 @@ fi
 rm -f conftest.*])
 AC_SUBST(libc_cv_pic_default)
 
+AC_CACHE_CHECK([whether -fPIE is default], libc_cv_pie_default,
+[libc_cv_pie_default=yes
+cat > conftest.c <<EOF
+#if defined __PIE__ || defined __pie__ || defined PIE || defined pie
+# error PIE is default.
+#endif
+EOF
+if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
+  libc_cv_pie_default=no
+fi
+rm -f conftest.*])
+AC_SUBST(libc_cv_pie_default)
+
 AC_SUBST(profile)
 AC_SUBST(static_nss)