[1/3] Check linker suppor for -z indirect-extern-access
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| dj/TryBot-apply_patch |
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Patch applied to master at the time it was sent
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Commit Message
Binutils 2.37 supports -z indirect-extern-access. If
GNU_PROPERTY_1_NEEDED_INDIRECT_EXTERN_ACCESS is set on any input
relocatable files:
1. Don't generate copy relocations.
2. Turn off extern_protected_data since it implies
GNU_PROPERTY_NO_COPY_ON_PROTECTED.
3. Treate reference to protected symbols with indirect external access
as local.
4. Set GNU_PROPERTY_1_NEEDED_INDIRECT_EXTERN_ACCESS on output.
5. When generating executable, clear this bit when there are non-GOT
or non-PLT relocations in input relocatable files without the bit set.
6. Add -z [no]indirect-extern-access to control indirect external access.
---
configure | 32 ++++++++++++++++++++++++++++++++
configure.ac | 21 +++++++++++++++++++++
2 files changed, 53 insertions(+)
@@ -5819,6 +5819,38 @@ fi
$as_echo "$libc_cv_insert" >&6; }
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking -z indirect-extern-access" >&5
+$as_echo_n "checking -z indirect-extern-access... " >&6; }
+if ${libc_cv_z_indirect_extern_access+:} false; then :
+ $as_echo_n "(cached) " >&6
+else
+ cat > conftest.c <<EOF
+ __attribute__ ((visibility ("protected")))
+ void bar (void) {}
+ void *bar_p (void) { return &bar; }
+EOF
+ libc_cv_z_indirect_extern_access=no
+ if { ac_try='${CC-cc} -Wl,-z,indirect-extern-access
+ -nostdlib -nostartfiles $CFLAGS $CPPFLAGS $LDFLAGS
+ -fPIC -shared $no_ssp -o conftest.so conftest.c
+ 1>&5'
+ { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
+ (eval $ac_try) 2>&5
+ ac_status=$?
+ $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+ test $ac_status = 0; }; }; then
+ libc_cv_z_indirect_extern_access=yes
+ else
+ libc_cv_z_indirect_extern_access=no
+ fi
+ rm -f conftest.*
+
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_z_indirect_extern_access" >&5
+$as_echo "$libc_cv_z_indirect_extern_access" >&6; }
+config_vars="$config_vars
+have-z-indirect-extern-access = $libc_cv_z_indirect_extern_access"
+
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for broken __attribute__((alias()))" >&5
$as_echo_n "checking for broken __attribute__((alias()))... " >&6; }
if ${libc_cv_broken_alias_attribute+:} false; then :
@@ -1235,6 +1235,27 @@ EOF
])
AC_SUBST(libc_cv_insert)
+AC_CACHE_CHECK(-z indirect-extern-access,
+ libc_cv_z_indirect_extern_access,
+ [cat > conftest.c <<EOF
+ __attribute__ ((visibility ("protected")))
+ void bar (void) {}
+ void *bar_p (void) { return &bar; }
+EOF
+ libc_cv_z_indirect_extern_access=no
+ if AC_TRY_COMMAND([${CC-cc} -Wl,-z,indirect-extern-access
+ -nostdlib -nostartfiles $CFLAGS $CPPFLAGS $LDFLAGS
+ -fPIC -shared $no_ssp -o conftest.so conftest.c
+ 1>&AS_MESSAGE_LOG_FD]); then
+ libc_cv_z_indirect_extern_access=yes
+ else
+ libc_cv_z_indirect_extern_access=no
+ fi
+ rm -f conftest.*
+ ])
+LIBC_CONFIG_VAR([have-z-indirect-extern-access],
+ [$libc_cv_z_indirect_extern_access])
+
AC_CACHE_CHECK(for broken __attribute__((alias())),
libc_cv_broken_alias_attribute,
[cat > conftest.c <<EOF