From e432a5f08d75480753cf3cf81d656f0e1dd4da79 Mon Sep 17 00:00:00 2001 From: Cory Fields Date: Mon, 18 Aug 2014 15:55:54 -0400 Subject: [PATCH] build: add option for reducing exports (v2) This was committed previously as 4975ae172 and reverted, because the flags were applied even if the checks didn't pass. This is the same commit, fixed up to actually disable the functionality when necessary. Enabled automatically if boost >= 1.49. See: https://svn.boost.org/trac/boost/ticket/2309 Also, check for a default visibility attribute, so that we can mark future api functions correctly. --- configure.ac | 78 +++++++++++++++++++++++++++++++++++++ src/Makefile.am | 3 ++ src/Makefile.qt.include | 2 +- src/Makefile.qttest.include | 2 +- src/Makefile.test.include | 1 + 5 files changed, 84 insertions(+), 2 deletions(-) diff --git a/configure.ac b/configure.ac index 7db6ebac0..601ccf0a7 100644 --- a/configure.ac +++ b/configure.ac @@ -90,6 +90,12 @@ AC_ARG_ENABLE([hardening], [use_hardening=$enableval], [use_hardening=yes]) +AC_ARG_ENABLE([reduce-exports], + [AS_HELP_STRING([--enable-reduce-exports], + [attempt to reduce exported symbols in the resulting executables (default is yes)])], + [use_reduce_exports=$enableval], + [use_reduce_exports=auto]) + AC_ARG_ENABLE([ccache], [AS_HELP_STRING([--enable-ccache], [use ccache for building (default is yes if ccache is found)])], @@ -396,6 +402,36 @@ AC_TRY_COMPILE([#include ], AC_SEARCH_LIBS([clock_gettime],[rt]) +AC_MSG_CHECKING([for visibility attribute]) +AC_LINK_IFELSE([AC_LANG_SOURCE([ + int foo_def( void ) __attribute__((visibility("default"))); + int main(){} + ])], + [ + AC_DEFINE(HAVE_VISIBILITY_ATTRIBUTE,1,[Define if the visibility attribute is supported.]) + AC_MSG_RESULT(yes) + ], + [ + AC_MSG_RESULT(no) + if test x$use_reduce_exports = xyes; then + AC_MSG_ERROR([Cannot find a working visibility attribute. Use --disable-reduced-exports.]) + fi + AC_MSG_WARN([Cannot find a working visibility attribute. Disabling reduced exports.]) + use_reduce_exports=no + ] +) + +if test x$use_reduce_exports != xno; then + AX_CHECK_COMPILE_FLAG([-fvisibility=hidden],[RE_CXXFLAGS="-fvisibility=hidden"], + [ + if test x$use_reduce_exports = xyes; then + AC_MSG_ERROR([Cannot set default symbol visibility. Use --disable-reduced-exports.]) + fi + AC_MSG_WARN([Cannot set default symbol visibility. Disabling reduced exports.]) + use_reduce_exports=no + ]) +fi + LEVELDB_CPPFLAGS= LIBLEVELDB= LIBMEMENV= @@ -426,6 +462,40 @@ AX_BOOST_PROGRAM_OPTIONS AX_BOOST_THREAD AX_BOOST_CHRONO + +if test x$use_reduce_exports != xno; then + AC_MSG_CHECKING([for working boost reduced exports]) + TEMP_CPPFLAGS="$CPPFLAGS" + CPPFLAGS="$BOOST_CPPFLAGS $CPPFLAGS" + AC_PREPROC_IFELSE([AC_LANG_PROGRAM([[ + @%:@include + ]], [[ + #if BOOST_VERSION >= 104900 + // Everything is okay + #else + # error Boost version is too old + #endif + ]])],[ + AC_MSG_RESULT(yes) + ],[: + if test x$use_reduce_exports = xauto; then + use_reduce_exports=no + else + if test x$use_reduce_exports = xyes; then + AC_MSG_ERROR([boost versions < 1.49 are known to be broken with reduced exports. Use --disable-reduced-exports.]) + fi + fi + AC_MSG_RESULT(no) + AC_MSG_WARN([boost versions < 1.49 are known to have symbol visibility issues. Disabling reduced exports.]) + ]) + CPPFLAGS="$TEMP_CPPFLAGS" +fi + +if test x$use_reduce_exports != xno; then + CXXFLAGS="$CXXFLAGS $RE_CXXFLAGS" + AX_CHECK_LINK_FLAG([[-Wl,--exclude-libs,ALL]], [RELDFLAGS="-Wl,--exclude-libs,ALL"]) +fi + if test x$use_tests = xyes; then if test x$HEXDUMP = x; then @@ -672,6 +742,13 @@ else AC_MSG_RESULT([no]) fi +AC_MSG_CHECKING([whether to reduce exports]) +if test x$use_reduce_exports != xno; then + AC_MSG_RESULT([yes]) +else + AC_MSG_RESULT([no]) +fi + if test x$build_bitcoin_utils$build_bitcoind$bitcoin_enable_qt$use_tests = xnononono; then AC_MSG_ERROR([No targets! Please specify at least one of: --with-utils --with-daemon --with-gui or --enable-tests]) fi @@ -704,6 +781,7 @@ AC_SUBST(CLIENT_VERSION_IS_RELEASE, _CLIENT_VERSION_IS_RELEASE) AC_SUBST(COPYRIGHT_YEAR, _COPYRIGHT_YEAR) +AC_SUBST(RELDFLAGS) AC_SUBST(LIBTOOL_LDFLAGS) AC_SUBST(USE_UPNP) AC_SUBST(USE_QRCODE) diff --git a/src/Makefile.am b/src/Makefile.am index 6292b5d61..1bb59bce7 100644 --- a/src/Makefile.am +++ b/src/Makefile.am @@ -261,6 +261,7 @@ endif bitcoind_LDADD += $(BOOST_LIBS) $(BDB_LIBS) $(SSL_LIBS) $(CRYPTO_LIBS) bitcoind_CPPFLAGS = $(BITCOIN_INCLUDES) +bitcoind_LDFLAGS = $(RELDFLAGS) $(AM_LDFLAGS) # bitcoin-cli binary # bitcoin_cli_LDADD = \ @@ -298,10 +299,12 @@ endif bitcoin_tx_SOURCES = bitcoin-tx.cpp bitcoin_tx_CPPFLAGS = $(BITCOIN_INCLUDES) # +bitcoin_tx_LDFLAGS = $(RELDFLAGS) $(AM_LDFLAGS) if TARGET_WINDOWS bitcoin_cli_SOURCES += bitcoin-cli-res.rc endif +bitcoin_cli_LDFLAGS = $(RELDFLAGS) $(AM_LDFLAGS) CLEANFILES = leveldb/libleveldb.a leveldb/libmemenv.a *.gcda *.gcno diff --git a/src/Makefile.qt.include b/src/Makefile.qt.include index 9a333d5c7..28d7053fc 100644 --- a/src/Makefile.qt.include +++ b/src/Makefile.qt.include @@ -362,7 +362,7 @@ qt_bitcoin_qt_LDADD += $(LIBBITCOIN_CLI) $(LIBBITCOIN_COMMON) $(LIBBITCOIN_UTIL) if USE_LIBSECP256K1 qt_bitcoin_qt_LDADD += secp256k1/libsecp256k1.la endif -qt_bitcoin_qt_LDFLAGS = $(AM_LDFLAGS) $(QT_LDFLAGS) +qt_bitcoin_qt_LDFLAGS = $(RELDFLAGS) $(AM_LDFLAGS) $(QT_LDFLAGS) #locale/foo.ts -> locale/foo.qm QT_QM=$(QT_TS:.ts=.qm) diff --git a/src/Makefile.qttest.include b/src/Makefile.qttest.include index ee8edb994..2cba5b7e1 100644 --- a/src/Makefile.qttest.include +++ b/src/Makefile.qttest.include @@ -36,7 +36,7 @@ qt_test_test_bitcoin_qt_LDADD += $(LIBBITCOIN_CLI) $(LIBBITCOIN_COMMON) $(LIBBIT if USE_LIBSECP256K1 qt_test_test_bitcoin_qt_LDADD += secp256k1/libsecp256k1.la endif -qt_test_test_bitcoin_qt_LDFLAGS = $(AM_LDFLAGS) $(QT_LDFLAGS) +qt_test_test_bitcoin_qt_LDFLAGS = $(RELDFLAGS) $(AM_LDFLAGS) $(QT_LDFLAGS) CLEAN_BITCOIN_QT_TEST = $(TEST_QT_MOC_CPP) qt/test/*.gcda qt/test/*.gcno diff --git a/src/Makefile.test.include b/src/Makefile.test.include index b5fee0822..b54c9be66 100644 --- a/src/Makefile.test.include +++ b/src/Makefile.test.include @@ -75,6 +75,7 @@ if USE_LIBSECP256K1 endif test_test_bitcoin_LDADD += $(BDB_LIBS) $(SSL_LIBS) $(CRYPTO_LIBS) +test_test_bitcoin_LDFLAGS = $(RELDFLAGS) $(AM_LDFLAGS) nodist_test_test_bitcoin_SOURCES = $(GENERATED_TEST_FILES)