diff options
Diffstat (limited to 'ld')
| -rw-r--r-- | ld/ChangeLog | 8 | ||||
| -rw-r--r-- | ld/NEWS | 3 | ||||
| -rw-r--r-- | ld/emultempl/elf.em | 15 | ||||
| -rw-r--r-- | ld/ld.texi | 13 | ||||
| -rw-r--r-- | ld/ldmain.c | 2 |
5 files changed, 41 insertions, 0 deletions
diff --git a/ld/ChangeLog b/ld/ChangeLog index 2a6f1b5489d..fc6a43b4b44 100644 --- a/ld/ChangeLog +++ b/ld/ChangeLog @@ -1,3 +1,11 @@ +2020-06-12 Roland McGrath <mcgrathr@google.com> + + * NEWS: Mention -z start-stop-visibility=... option for ELF. + * ld.texi (Options): Document -z start-stop-visibility=... option. + * ldmain.c (main): Initialize link_info.start_stop_visibility. + * emultempl/elf.em (gld${EMULATION_NAME}_handle_option): + Parse -z start-stop-visibility=... option. + 2020-06-11 Alan Modra <amodra@gmail.com> * testsuite/ld-plugin/lto.exp (lto_link_tests): Move lto-6, @@ -25,6 +25,9 @@ searched relative to the directory of the linker script before other search paths. +* Add ELF linker command-line option `-z start-stop-visibility=...' to control + the visibility of synthetic `__start_SECNAME` and `__stop_SECNAME` symbols. + Changes in 2.34: * The ld check for "PHDR segment not covered by LOAD segment" is more diff --git a/ld/emultempl/elf.em b/ld/emultempl/elf.em index c4979eb9538..c577e8b2e61 100644 --- a/ld/emultempl/elf.em +++ b/ld/emultempl/elf.em @@ -749,6 +749,21 @@ fragment <<EOF { link_info.flags_1 |= DF_1_GLOBAUDIT; } + else if (CONST_STRNEQ (optarg, "start-stop-visibility=")) + { + if (strcmp (optarg, "start-stop-visibility=default") == 0) + link_info.start_stop_visibility = STV_DEFAULT; + else if (strcmp (optarg, "start-stop-visibility=internal") == 0) + link_info.start_stop_visibility = STV_INTERNAL; + else if (strcmp (optarg, "start-stop-visibility=hidden") == 0) + link_info.start_stop_visibility = STV_HIDDEN; + else if (strcmp (optarg, "start-stop-visibility=protected") == 0) + link_info.start_stop_visibility = STV_PROTECTED; + else + einfo (_("%F%P: invalid visibility in \`-z %s'; " + "must be default, internal, hidden, or protected"), + optarg); + } EOF if test x"$GENERATE_SHLIB_SCRIPT" = xyes; then diff --git a/ld/ld.texi b/ld/ld.texi index bf474d4c62b..b89c1a57c0b 100644 --- a/ld/ld.texi +++ b/ld/ld.texi @@ -1373,6 +1373,19 @@ Specify a stack size for an ELF @code{PT_GNU_STACK} segment. Specifying zero will override any default non-zero sized @code{PT_GNU_STACK} segment creation. +@item start-stop-visibility=@var{value} +@cindex visibility +@cindex ELF symbol visibility +Specify the ELF symbol visibility for synthesized +@code{__start_SECNAME} and @code{__stop_SECNAME} symbols (@pxref{Input +Section Example}). @var{value} must be exactly @samp{default}, +@samp{internal}, @samp{hidden}, or @samp{protected}. If no @samp{-z +start-stop-visibility} option is given, @samp{protected} is used for +compatibility with historical practice. However, it's highly +recommended to use @samp{-z start-stop-visibility=hidden} in new +programs and shared libraries so that these symbols are not exported +between shared objects, which is not usually what's intended. + @item text @itemx notext @itemx textoff diff --git a/ld/ldmain.c b/ld/ldmain.c index e2c559ea3e0..b0ce69f1186 100644 --- a/ld/ldmain.c +++ b/ld/ldmain.c @@ -27,6 +27,7 @@ #include "bfdlink.h" #include "ctf-api.h" #include "filenames.h" +#include "elf/common.h" #include "ld.h" #include "ldmain.h" @@ -307,6 +308,7 @@ main (int argc, char **argv) #ifdef DEFAULT_NEW_DTAGS link_info.new_dtags = DEFAULT_NEW_DTAGS; #endif + link_info.start_stop_visibility = STV_PROTECTED; ldfile_add_arch (""); emulation = get_emulation (argc, argv); |