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configure: add linker export script support on Darwin

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This isn't a "version script" in the usual sense, since it doesn't set symbol
versions directly. Instead, the version for the whole .dylib is set in the
linker flags, and we generate a list of symbol patterns to export. This allows
us to keep our local symbols (e.g. ff_*) local on the platform.

The Darwin linker's exported_symbols_list format is a bit different than the
one used by the GNU linker. It doesn't handle local symbols at all, since when
a list is provided, all unlisted symbols are local by default; thus, we remove
local sections. It doesn't handle per-version sections, so we remove the
headers and brackets. It expects symbols to be prefixed with an underscore.
It errors if a listed symbol with no wildcards is not present in the output,
so we append an asterisk to any symbol that doesn't already end in one.
This commit is contained in:
Rodger Combs 2016-09-09 18:12:34 -05:00
parent be1d32492e
commit 63fbeebf6e
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1 changed files with 2 additions and 0 deletions
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configure vendored
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@ -4705,6 +4705,8 @@ case $target_os in
{ check_cflags -mdynamic-no-pic && add_asflags -mdynamic-no-pic; }
check_header dispatch/dispatch.h &&
add_cppflags '-I\$(SRC_PATH)/compat/dispatch_semaphore'
version_script='-exported_symbols_list'
VERSION_SCRIPT_POSTPROCESS_CMD='tr " " "\n" | sed -n /global:/,/local:/p | grep ";" | tr ";" "\n" | sed -E "s/(.+)/_\1/g" | sed -E "s/(.+[^*])$$$$/\1*/"'
;;
msys*)
die "Native MSYS builds are discouraged, please use the MINGW environment."