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| author | Mike Frysinger <vapier@gentoo.org> | 2014-08-06 23:44:29 -0400 |
|---|---|---|
| committer | Mike Frysinger <vapier@gentoo.org> | 2014-08-12 19:54:02 -0400 |
| commit | 61b1ef6e7cc4518cdadb808dfa78980cc15a63c3 (patch) | |
| tree | 5ca04e8eb95d11b26b74bbaeea9226787bf7dbdd /configure | |
| parent | 898c62f488e9c403bbb1a96d06c7a257b047fcbc (diff) | |
| download | glibc-61b1ef6e7cc4518cdadb808dfa78980cc15a63c3.tar.gz glibc-61b1ef6e7cc4518cdadb808dfa78980cc15a63c3.tar.xz glibc-61b1ef6e7cc4518cdadb808dfa78980cc15a63c3.zip | |
detect broken linker handling of __ehdr_start
Older versions of ld on ia64 support __ehdr_start, but generate relocs when they shouldn't. This causes the ld.so to not run because it tries to resolve the __ehdr_start symbol (but it's not exported).
Diffstat (limited to 'configure')
| -rwxr-xr-x | configure | 26 |
1 files changed, 20 insertions, 6 deletions
diff --git a/configure b/configure index 646e0bc9af..86ba30774b 100755 --- a/configure +++ b/configure @@ -6965,8 +6965,11 @@ if test $libc_cv_predef_stack_protector = yes; then fi libc_extra_cppflags= -{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether the linker provides __ehdr_start" >&5 -$as_echo_n "checking whether the linker provides __ehdr_start... " >&6; } +# Some linkers on some architectures support __ehdr_start but with +# bugs. Make sure usage of it does not create relocations in the +# output (as the linker should resolve them all for us). +{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether the linker provides working __ehdr_start" >&5 +$as_echo_n "checking whether the linker provides working __ehdr_start... " >&6; } if ${libc_cv_ehdr_start+:} false; then : $as_echo_n "(cached) " >&6 else @@ -6980,12 +6983,20 @@ LIBS= cat confdefs.h - <<_ACEOF >conftest.$ac_ext /* end confdefs.h. */ -extern const char __ehdr_start __attribute__ ((visibility ("hidden"))); -const char *ehdr (void) { return &__ehdr_start; } +typedef struct { + char foo; + long val; +} Ehdr; +extern const Ehdr __ehdr_start __attribute__ ((visibility ("hidden"))); +long ehdr (void) { return __ehdr_start.val; } _ACEOF if ac_fn_c_try_link "$LINENO"; then : - libc_cv_ehdr_start=yes + if $READELF -r conftest | fgrep __ehdr_start >/dev/null; then + libc_cv_ehdr_start=broken + else + libc_cv_ehdr_start=yes + fi else libc_cv_ehdr_start=no fi @@ -6998,9 +7009,12 @@ LIBS="$old_LIBS" fi { $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_ehdr_start" >&5 $as_echo "$libc_cv_ehdr_start" >&6; } -if test $libc_cv_ehdr_start = yes; then +if test "$libc_cv_ehdr_start" = yes; then $as_echo "#define HAVE_EHDR_START 1" >>confdefs.h +elif test "$libc_cv_ehdr_start" = broken; then + { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: linker is broken -- you should upgrade" >&5 +$as_echo "$as_me: WARNING: linker is broken -- you should upgrade" >&2;} fi { $as_echo "$as_me:${as_lineno-$LINENO}: checking for __builtin_trap with no external dependencies" >&5 |