diff options
Diffstat (limited to 'aclocal.m4')
| -rw-r--r-- | aclocal.m4 | 159 |
1 files changed, 156 insertions, 3 deletions
diff --git a/aclocal.m4 b/aclocal.m4 index aaddfbfa3..32c80266e 100644 --- a/aclocal.m4 +++ b/aclocal.m4 @@ -820,6 +820,160 @@ fi ]) +dnl GMP_LIBDIR +dnl ---------- +dnl Establish $gmp_libdir, an expanded value of $libdir. +dnl +dnl The default for $libdir is "${exec_prefix}/lib" and the user may well +dnl give something similar, perhaps using ${prefix}. In either case this +dnl is normally expanded when "make" runs, allowing the prefix to be +dnl specified during "make", per the GNU standards. +dnl +dnl $prefix and $exec_prefix can be NONE if not specified by the user with +dnl --prefix and --exec_prefix. Autoconf leaves it until the end of +dnl configure to default $prefix to $ac_default_prefix, and $exec_prefix in +dnl turn to $prefix. + +AC_DEFUN(GMP_LIBDIR, +[gmp_save_prefix=$prefix +gmp_save_exec_prefix=$exec_prefix +if test "$prefix" = NONE; then + prefix=$ac_default_prefix +fi +if test "$exec_prefix" = NONE; then + exec_prefix=$prefix +fi +eval gmp_libdir=$libdir +prefix=$gmp_save_prefix +exec_prefix=$gmp_save_exec_prefix +]) + + +dnl GMP_LDFLAGS_SYMBOLIC +dnl -------------------- +dnl Try to find a "symbolic" option for shared libraries, to resolve +dnl intra-library function calls directly to their targets, rather than +dnl going through the PLT or whatever. +dnl +dnl Suitable libtool --mode=link options are setup in AC_SUBST's of +dnl LDFLAGS_CC_SYMBOLIC and LDFLAGS_CXX_SYMBOLIC. +dnl +dnl An effect of this is that an application cannot replace a GMP function +dnl and get calls from within libgmp.so to reach that replacement. There +dnl seems no good reason for an application to do this, and avoiding the +dnl PLT is smaller and faster. +dnl +dnl The only downside to this option is that tune/tuneup.c probably won't +dnl work in a shared-only build. We recommend it static anyway to avoid +dnl PIC overheads, so this is no great loss. +dnl +dnl "gcc -symbolic" +dnl This option is only available on some systems. When not available +dnl a message "unrecognized option `-symbolic'" is printed, but the +dnl exit code is still 0, hence the grep for that below. +dnl +dnl This option is checked before "ld -Bsymbolic", since on some +dnl systems it does more than just that. +dnl +dnl "ld -Bsymbolic" +dnl This is the usual SVR4/ELF way, supported and by vendor tools like +dnl Solaris and by GNU binutils. It might be thought "gcc -symbolic" +dnl would be available on all systems with this, but that's no so, in +dnl particular it's not on GNU/Linux, so try this directly. +dnl +dnl If libtool is using "ld" to link, then a compiler -Wc option will be +dnl silently ignored, and hence appear to succeed. We grep the libtool +dnl command echos to ensure our option appears. +dnl +dnl Separate tests are run for C and C++, in case the two vary in what +dnl works or what method libtool uses (cc or ld). +dnl +dnl Running the whole libtool lets us avoid getting too involved in how +dnl shared libraries are created. And if an option we try works in a +dnl compile and link like this, then there should be no risk of it later +dnl failing with the real libgmp etc. + +AC_DEFUN(GMP_LDFLAGS_SYMBOLIC, +[AC_REQUIRE([AC_PROG_LIBTOOL]) +if test "$enable_shared" = yes; then + GMP_LDFLAGS_CC_SYMBOLIC + if test "$want_cxx" = yes; then + GMP_LDFLAGS_CXX_SYMBOLIC + fi +fi +]) + +AC_DEFUN(GMP_LDFLAGS_CC_SYMBOLIC, +[AC_REQUIRE([AC_PROG_LIBTOOL]) +AC_REQUIRE([GMP_LIBDIR]) +AC_CACHE_CHECK([for C shared library -symbolic option], + gmp_cv_ldflags_cc_symbolic, +[gmp_cv_ldflags_cc_symbolic= +cat >conftest.c <<EOF +int foo () { return 123; } +EOF +gmp_compile="$SHELL ./libtool --mode=compile $CC $CFLAGS $CPPFLAGS -c conftest.c >&AC_FD_CC 2>&AC_FD_CC" +if AC_TRY_EVAL(gmp_compile); then + for i in "-Wc,-symbolic" "-Wl,-Bsymbolic"; do + gmp_link="$SHELL ./libtool --mode=link $CC $CFLAGS $LDFLAGS $GMP_LDFLAGS $i -rpath $gmp_libdir conftest.lo -o libconftest.la >conftest.out 2>&1" + if AC_TRY_EVAL(gmp_link); then + cat conftest.out >&AC_FD_CC + gmp_opt=`echo "$i" | sed 's/-W.,//'` + if grep -e "$gmp_opt" conftest.out >/dev/null; then + # must have our option appear in libtool's echos + if grep "unrecognized option \`$gmp_opt'" conftest.out >/dev/null; then + : + else + gmp_cv_ldflags_cc_symbolic=$i + break + fi + fi + else + cat conftest.out >&AC_FD_CC + fi + done +fi +rm -f conftest* $lt_cv_objdir/conftest* libconftest* $lt_cv_objdir/libconftest* +]) +AC_SUBST(LDFLAGS_CC_SYMBOLIC,$gmp_cv_ldflags_cc_symbolic) +]) + +AC_DEFUN(GMP_LDFLAGS_CXX_SYMBOLIC, +[AC_REQUIRE([AC_PROG_LIBTOOL]) +AC_REQUIRE([GMP_LIBDIR]) +AC_CACHE_CHECK([for C++ shared library -symbolic option], + gmp_cv_ldflags_cxx_symbolic, +[gmp_cv_ldflags_cxx_symbolic= +cat >conftest.cc <<EOF +int foo (void) { return 123; } +EOF +gmp_compile="$SHELL ./libtool --mode=compile $CXX $CXXFLAGS $CPPFLAGS -c conftest.cc >&AC_FD_CC 2>&AC_FD_CC" +if AC_TRY_EVAL(gmp_compile); then + for i in "-Wc,-symbolic" "-Wl,-Bsymbolic"; do + gmp_link="$SHELL ./libtool --mode=link $CXX $CXXFLAGS $LDFLAGS $GMP_LDFLAGS $i -rpath $gmp_libdir conftest.lo -o libconftest.la >conftest.out 2>&1" + if AC_TRY_EVAL(gmp_link); then + cat conftest.out >&AC_FD_CC + gmp_opt=`echo "$i" | sed 's/-W.,//'` + if grep -e "$gmp_opt" conftest.out >/dev/null; then + # must have our option appear in libtool's echos + if grep "unrecognized option \`$gmp_opt'" conftest.out >/dev/null; then + : + else + gmp_cv_ldflags_cxx_symbolic=$i + break + fi + fi + else + cat conftest.out >&AC_FD_CC + fi + done +fi +rm -f conftest* $lt_cv_objdir/conftest* libconftest* $lt_cv_objdir/libconftest* +]) +AC_SUBST(LDFLAGS_CXX_SYMBOLIC,$gmp_cv_ldflags_cxx_symbolic) +]) + + dnl GMP_INIT([M4-DEF-FILE]) dnl ----------------------- dnl Initializations for GMP config.m4 generation. @@ -1293,9 +1447,8 @@ dnl The assembler directive to mark a label as a global symbol. dnl dnl ia64 - .global is standard, according to the Intel documentation. dnl -dnl hppa - ".export foo,entry" is demanded by HP hppa "as". -dnl HP hppa "as" accepts .global, but it's not clear what it does, only -dnl .export actually creates a global symbol. +dnl hppa - ".export foo,entry" is demanded by HP hppa "as". ".global" is a +dnl kind of import. dnl dnl other - .globl is usual. dnl |