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Add an autoconf check for -retain-symbols-file and conditionalize
use of that option with it. This eliminates an imprecise "Linux" test, and should help support old versions of gold. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101560 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -337,3 +337,7 @@ ENABLE_LLVMC_DYNAMIC_PLUGINS = 1
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NO_MISSING_FIELD_INITIALIZERS = @NO_MISSING_FIELD_INITIALIZERS@
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# -Wno-variadic-macros
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NO_VARIADIC_MACROS = @NO_VARIADIC_MACROS@
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# Flags supported by the linker.
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# bfd ld / gold -retain-symbols-file file
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HAVE_LINK_RETAIN_SYMBOLS_FILE = @HAVE_LINK_RETAIN_SYMBOLS_FILE@
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@ -561,7 +561,7 @@ ifeq ($(HOST_OS),Darwin)
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# Get "4" out of 10.4 for later pieces in the makefile.
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DARWIN_MAJVERS := $(shell echo $(DARWIN_VERSION)| sed -E 's/10.([0-9]).*/\1/')
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SharedLinkOptions=-Wl,-flat_namespace -Wl,-undefined -Wl,suppress \
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SharedLinkOptions=-Wl,-flat_namespace -Wl,-undefined,suppress \
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-dynamiclib
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ifneq ($(ARCH),ARM)
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SharedLinkOptions += -mmacosx-version-min=$(DARWIN_VERSION)
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@ -990,13 +990,12 @@ endif
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# Now add the linker command-line options to use the native export file.
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ifeq ($(HOST_OS),Darwin)
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LLVMLibsOptions += -Wl,-exported_symbols_list -Wl,$(NativeExportsFile)
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LLVMLibsOptions += -Wl,-exported_symbols_list,$(NativeExportsFile)
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endif
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# This isn't really Linux-specific; it works at least on gold and bfd ld, but
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# there's no convenient way to detect it.
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ifeq ($(HOST_OS),Linux)
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LLVMLibsOptions += -Wl,-retain-symbols-file -Wl,$(NativeExportsFile)
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# gold, bfd ld, etc.
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ifeq ($(HAVE_LINK_RETAIN_SYMBOLS_FILE),1)
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LLVMLibsOptions += -Wl,-retain-symbols-file,$(NativeExportsFile)
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endif
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endif
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@ -1297,7 +1296,7 @@ ifeq ($(HOST_OS),Darwin)
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# Tiger tools don't support this.
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ifneq ($(DARWIN_MAJVERS),4)
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LD.Flags += -Wl,-exported_symbol -Wl,_main
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LD.Flags += -Wl,-exported_symbol,_main
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endif
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endif
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@ -1022,6 +1022,9 @@ AC_LINK_USE_R
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dnl Determine whether the linker supports the -export-dynamic option.
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AC_LINK_EXPORT_DYNAMIC
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dnl Determine whether the linker supports the -retain-symbols-file option.
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AC_LINK_RETAIN_SYMBOLS_FILE
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dnl Check for libtool and the library that has dlopen function (which must come
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dnl before the AC_PROG_LIBTOOL check in order to enable dlopening libraries with
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dnl libtool).
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@ -39,3 +39,46 @@ if test "$llvm_cv_link_use_export_dynamic" = yes ; then
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fi
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])
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#
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# Determine if the system can handle the -retain-symbols-file option being
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# passed to the linker.
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#
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# This macro is specific to LLVM.
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#
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AC_DEFUN([AC_LINK_RETAIN_SYMBOLS_FILE],
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[AC_CACHE_CHECK([for compiler -Wl,-retain-symbols-file option],
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[llvm_cv_link_use_retain_symbols_file],
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[ AC_LANG_PUSH([C])
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oldcflags="$CFLAGS"
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# The following code is from the autoconf manual,
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# "11.13: Limitations of Usual Tools".
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# Create a temporary directory $tmp in $TMPDIR (default /tmp).
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# Use mktemp if possible; otherwise fall back on mkdir,
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# with $RANDOM to make collisions less likely.
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: ${TMPDIR=/tmp}
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{
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tmp=`
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(umask 077 && mktemp -d "$TMPDIR/fooXXXXXX") 2>/dev/null
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` &&
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test -n "$tmp" && test -d "$tmp"
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} || {
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tmp=$TMPDIR/foo$$-$RANDOM
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(umask 077 && mkdir "$tmp")
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} || exit $?
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echo "main" > "$tmp/exports"
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CFLAGS="$CFLAGS -Wl,-retain-symbols-file=$tmp/exports"
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AC_LINK_IFELSE([AC_LANG_PROGRAM([[]],[[int main() { return 0; }]])],
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[llvm_cv_link_use_retain_symbols_file=yes],[llvm_cv_link_use_retain_symbols_file=no])
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rm "$tmp/exports"
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rmdir "$tmp"
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CFLAGS="$oldcflags"
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AC_LANG_POP([C])
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])
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if test "$llvm_cv_link_use_retain_symbols_file" = yes ; then
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AC_SUBST(HAVE_LINK_RETAIN_SYMBOLS_FILE,1)
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fi
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])
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