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
This commit is contained in:
Dan Gohman 2010-04-16 22:58:15 +00:00
parent f7e2bc80d1
commit e05f609b61
4 changed files with 56 additions and 7 deletions

View File

@ -337,3 +337,7 @@ ENABLE_LLVMC_DYNAMIC_PLUGINS = 1
NO_MISSING_FIELD_INITIALIZERS = @NO_MISSING_FIELD_INITIALIZERS@
# -Wno-variadic-macros
NO_VARIADIC_MACROS = @NO_VARIADIC_MACROS@
# Flags supported by the linker.
# bfd ld / gold -retain-symbols-file file
HAVE_LINK_RETAIN_SYMBOLS_FILE = @HAVE_LINK_RETAIN_SYMBOLS_FILE@

View File

@ -561,7 +561,7 @@ ifeq ($(HOST_OS),Darwin)
# Get "4" out of 10.4 for later pieces in the makefile.
DARWIN_MAJVERS := $(shell echo $(DARWIN_VERSION)| sed -E 's/10.([0-9]).*/\1/')
SharedLinkOptions=-Wl,-flat_namespace -Wl,-undefined -Wl,suppress \
SharedLinkOptions=-Wl,-flat_namespace -Wl,-undefined,suppress \
-dynamiclib
ifneq ($(ARCH),ARM)
SharedLinkOptions += -mmacosx-version-min=$(DARWIN_VERSION)
@ -990,13 +990,12 @@ endif
# Now add the linker command-line options to use the native export file.
ifeq ($(HOST_OS),Darwin)
LLVMLibsOptions += -Wl,-exported_symbols_list -Wl,$(NativeExportsFile)
LLVMLibsOptions += -Wl,-exported_symbols_list,$(NativeExportsFile)
endif
# This isn't really Linux-specific; it works at least on gold and bfd ld, but
# there's no convenient way to detect it.
ifeq ($(HOST_OS),Linux)
LLVMLibsOptions += -Wl,-retain-symbols-file -Wl,$(NativeExportsFile)
# gold, bfd ld, etc.
ifeq ($(HAVE_LINK_RETAIN_SYMBOLS_FILE),1)
LLVMLibsOptions += -Wl,-retain-symbols-file,$(NativeExportsFile)
endif
endif
@ -1297,7 +1296,7 @@ ifeq ($(HOST_OS),Darwin)
# Tiger tools don't support this.
ifneq ($(DARWIN_MAJVERS),4)
LD.Flags += -Wl,-exported_symbol -Wl,_main
LD.Flags += -Wl,-exported_symbol,_main
endif
endif

View File

@ -1022,6 +1022,9 @@ AC_LINK_USE_R
dnl Determine whether the linker supports the -export-dynamic option.
AC_LINK_EXPORT_DYNAMIC
dnl Determine whether the linker supports the -retain-symbols-file option.
AC_LINK_RETAIN_SYMBOLS_FILE
dnl Check for libtool and the library that has dlopen function (which must come
dnl before the AC_PROG_LIBTOOL check in order to enable dlopening libraries with
dnl libtool).

View File

@ -39,3 +39,46 @@ if test "$llvm_cv_link_use_export_dynamic" = yes ; then
fi
])
#
# Determine if the system can handle the -retain-symbols-file option being
# passed to the linker.
#
# This macro is specific to LLVM.
#
AC_DEFUN([AC_LINK_RETAIN_SYMBOLS_FILE],
[AC_CACHE_CHECK([for compiler -Wl,-retain-symbols-file option],
[llvm_cv_link_use_retain_symbols_file],
[ AC_LANG_PUSH([C])
oldcflags="$CFLAGS"
# The following code is from the autoconf manual,
# "11.13: Limitations of Usual Tools".
# Create a temporary directory $tmp in $TMPDIR (default /tmp).
# Use mktemp if possible; otherwise fall back on mkdir,
# with $RANDOM to make collisions less likely.
: ${TMPDIR=/tmp}
{
tmp=`
(umask 077 && mktemp -d "$TMPDIR/fooXXXXXX") 2>/dev/null
` &&
test -n "$tmp" && test -d "$tmp"
} || {
tmp=$TMPDIR/foo$$-$RANDOM
(umask 077 && mkdir "$tmp")
} || exit $?
echo "main" > "$tmp/exports"
CFLAGS="$CFLAGS -Wl,-retain-symbols-file=$tmp/exports"
AC_LINK_IFELSE([AC_LANG_PROGRAM([[]],[[int main() { return 0; }]])],
[llvm_cv_link_use_retain_symbols_file=yes],[llvm_cv_link_use_retain_symbols_file=no])
rm "$tmp/exports"
rmdir "$tmp"
CFLAGS="$oldcflags"
AC_LANG_POP([C])
])
if test "$llvm_cv_link_use_retain_symbols_file" = yes ; then
AC_SUBST(HAVE_LINK_RETAIN_SYMBOLS_FILE,1)
fi
])