diff options
Diffstat (limited to 'ld')
| -rw-r--r-- | ld/ChangeLog | 12 | ||||
| -rw-r--r-- | ld/plugin.c | 36 | ||||
| -rw-r--r-- | ld/testsuite/ld-plugin/lto.exp | 9 | ||||
| -rw-r--r-- | ld/testsuite/ld-plugin/pass.out | 1 | ||||
| -rw-r--r-- | ld/testsuite/ld-plugin/pr20276a.c | 12 | ||||
| -rw-r--r-- | ld/testsuite/ld-plugin/pr20276b.c | 1 |
6 files changed, 58 insertions, 13 deletions
diff --git a/ld/ChangeLog b/ld/ChangeLog index b9b9c3e..cd161ab 100644 --- a/ld/ChangeLog +++ b/ld/ChangeLog @@ -1,3 +1,15 @@ +2016-06-20 H.J. Lu <hongjiu.lu@intel.com> + Alan Modra <amodra@gmail.com> + + PR ld/20276 + * plugin.c (plugin_notice): Set non_ir_ref on common symbols. + * testsuite/ld-plugin/lto.exp (lto_link_tests): Add test for + PR ld/20276. + (lto_run_tests): Likewise. + * testsuite/ld-plugin/pass.out: New file. + * testsuite/ld-plugin/pr20276a.c: Likewise. + * testsuite/ld-plugin/pr20276b.c: Likewise. + 2016-06-18 H.J. Lu <hongjiu.lu@intel.com> * plugin.c (plugin_object_p): Replace bfd_plugin_uknown diff --git a/ld/plugin.c b/ld/plugin.c index cb61318..4c161d1 100644 --- a/ld/plugin.c +++ b/ld/plugin.c @@ -1325,20 +1325,30 @@ plugin_notice (struct bfd_link_info *info, h->non_ir_ref = TRUE; } - /* Otherwise, it must be a new def. Ensure any symbol defined - in an IR dummy BFD takes on a new value from a real BFD. - Weak symbols are not normally overridden by a new weak - definition, and strong symbols will normally cause multiple - definition errors. Avoid this by making the symbol appear - to be undefined. */ - else if (((h->type == bfd_link_hash_defweak - || h->type == bfd_link_hash_defined) - && is_ir_dummy_bfd (sym_bfd = h->u.def.section->owner)) - || (h->type == bfd_link_hash_common - && is_ir_dummy_bfd (sym_bfd = h->u.c.p->section->owner))) + /* Otherwise, it must be a new def. */ + else { - h->type = bfd_link_hash_undefweak; - h->u.undef.abfd = sym_bfd; + /* A common symbol should be merged with other commons or + defs with the same name. In particular, a common ought + to be overridden by a def in a -flto object. In that + sense a common is also a ref. */ + if (bfd_is_com_section (section)) + h->non_ir_ref = TRUE; + + /* Ensure any symbol defined in an IR dummy BFD takes on a + new value from a real BFD. Weak symbols are not normally + overridden by a new weak definition, and strong symbols + will normally cause multiple definition errors. Avoid + this by making the symbol appear to be undefined. */ + if (((h->type == bfd_link_hash_defweak + || h->type == bfd_link_hash_defined) + && is_ir_dummy_bfd (sym_bfd = h->u.def.section->owner)) + || (h->type == bfd_link_hash_common + && is_ir_dummy_bfd (sym_bfd = h->u.c.p->section->owner))) + { + h->type = bfd_link_hash_undefweak; + h->u.undef.abfd = sym_bfd; + } } } diff --git a/ld/testsuite/ld-plugin/lto.exp b/ld/testsuite/ld-plugin/lto.exp index 7a13abb..7743719 100644 --- a/ld/testsuite/ld-plugin/lto.exp +++ b/ld/testsuite/ld-plugin/lto.exp @@ -183,6 +183,12 @@ set lto_link_tests [list \ [list "PR ld/19317 (1)" \ "$plug_opt" "-flto $lto_no_fat" \ {pr19317.c} {} "libpr19317.a"] \ + [list "Build pr20276a.o" \ + "" "-fno-lto" \ + {pr20276a.c}] \ + [list "Build pr20276b.o" \ + "$plug_opt" "-flto $lto_no_fat" \ + {pr20276b.c}] \ ] if { [at_least_gcc_version 4 7] } { @@ -332,6 +338,9 @@ set lto_run_tests [list \ [list "PR ld/19317 (3)" \ "-O2 -flto tmpdir/pr19317-r.o" "" \ {dummy.c} "pr19317.exe" "pr19317.out" "-flto -O2" "c"] \ + [list "Run pr20276" \ + "-O2 -flto tmpdir/pr20276a.o tmpdir/pr20276b.o" "" \ + {dummy.c} "pr20276" "pass.out" "-flto -O2" "c"] \ ] if { [at_least_gcc_version 4 7] } { diff --git a/ld/testsuite/ld-plugin/pass.out b/ld/testsuite/ld-plugin/pass.out new file mode 100644 index 0000000..7ef22e9 --- /dev/null +++ b/ld/testsuite/ld-plugin/pass.out @@ -0,0 +1 @@ +PASS diff --git a/ld/testsuite/ld-plugin/pr20276a.c b/ld/testsuite/ld-plugin/pr20276a.c new file mode 100644 index 0000000..0b37bc7 --- /dev/null +++ b/ld/testsuite/ld-plugin/pr20276a.c @@ -0,0 +1,12 @@ +#include <stdio.h> + +int global_var; +extern void abort (); + +int main(void) +{ + if (global_var != 20) + abort (); + printf ("PASS\n"); + return 0; +} diff --git a/ld/testsuite/ld-plugin/pr20276b.c b/ld/testsuite/ld-plugin/pr20276b.c new file mode 100644 index 0000000..2ecbc2c --- /dev/null +++ b/ld/testsuite/ld-plugin/pr20276b.c @@ -0,0 +1 @@ +int global_var = 20; |