diff options
| 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.ac | |
| parent | 898c62f488e9c403bbb1a96d06c7a257b047fcbc (diff) | |
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.ac')
| -rw-r--r-- | configure.ac | 23 |
1 files changed, 18 insertions, 5 deletions
diff --git a/configure.ac b/configure.ac index e89faa0dfe..255339983a 100644 --- a/configure.ac +++ b/configure.ac @@ -1880,7 +1880,10 @@ if test $libc_cv_predef_stack_protector = yes; then fi libc_extra_cppflags= -AC_CACHE_CHECK([whether the linker provides __ehdr_start], +# Some linkers on some architectures support __ehdr_start but with +# bugs. Make sure usage of it does not create relocations in the +# output (as the linker should resolve them all for us). +AC_CACHE_CHECK([whether the linker provides working __ehdr_start], libc_cv_ehdr_start, [ old_CFLAGS="$CFLAGS" old_LDFLAGS="$LDFLAGS" @@ -1889,16 +1892,26 @@ CFLAGS="$CFLAGS -fPIC" LDFLAGS="$LDFLAGS -nostdlib -nostartfiles -shared" LIBS= AC_LINK_IFELSE([AC_LANG_SOURCE([ -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; } ])], - [libc_cv_ehdr_start=yes], [libc_cv_ehdr_start=no]) + [if $READELF -r conftest | fgrep __ehdr_start >/dev/null; then + libc_cv_ehdr_start=broken + else + libc_cv_ehdr_start=yes + fi], [libc_cv_ehdr_start=no]) CFLAGS="$old_CFLAGS" LDFLAGS="$old_LDFLAGS" LIBS="$old_LIBS" ]) -if test $libc_cv_ehdr_start = yes; then +if test "$libc_cv_ehdr_start" = yes; then AC_DEFINE([HAVE_EHDR_START]) +elif test "$libc_cv_ehdr_start" = broken; then + AC_MSG_WARN([linker is broken -- you should upgrade]) fi AC_CACHE_CHECK(for __builtin_trap with no external dependencies, |