1 # Process this file with autoconf to produce a configure script, like so:
2 # aclocal && autoconf && autoheader && automake
5 AC_INIT([GCC Quad-precision Math Library], 0.1,,[libquadmath])
6 AC_CONFIG_HEADER(config.h)
8 # Gets build, host, target, *_vendor, *_cpu, *_os, etc.
10 # You will slowly go insane if you do not grok the following fact: when
11 # building this library, the top-level /target/ becomes the library's /host/.
13 # configure then causes --target to default to --host, exactly like any
14 # other package using autoconf. Therefore, 'target' and 'host' will
15 # always be the same. This makes sense both for native and cross compilers
16 # just think about it for a little while. :-)
18 # Also, if this library is being configured as part of a cross compiler, the
19 # top-level configure script will pass the "real" host as $with_cross_host.
21 # Do not delete or change the following two lines. For why, see
22 # http://gcc.gnu.org/ml/libstdc++/2003-07/msg00451.html
24 ACX_NONCANONICAL_TARGET
26 target_alias=${target_alias-$host_alias}
27 AC_SUBST(target_alias)
29 AM_INIT_AUTOMAKE([1.9.0 foreign subdir-objects no-dist -Wall -Wno-override -Werror])
31 AC_MSG_CHECKING([for --enable-version-specific-runtime-libs])
32 AC_ARG_ENABLE(version-specific-runtime-libs,
33 AS_HELP_STRING([--enable-version-specific-runtime-libs],
34 [specify that runtime libraries should be installed in a compiler-specific directory]),
36 yes) version_specific_libs=yes ;;
37 no) version_specific_libs=no ;;
38 *) AC_MSG_ERROR([Unknown argument to enable/disable version-specific libs]);;
40 [version_specific_libs=no])
41 AC_MSG_RESULT($version_specific_libs)
45 # See if makeinfo has been installed and is modern enough
47 ACX_CHECK_PROG_VER([MAKEINFO], [makeinfo], [--version],
48 [GNU texinfo.* \([0-9][0-9.]*\)],
49 [4.[4-9]*|4.[1-9][0-9]*|[5-9]*|[1-9][0-9]*])
50 AM_CONDITIONAL(BUILD_INFO, test $gcc_cv_prog_makeinfo_modern = "yes")
52 ACX_BUGURL([http://gcc.gnu.org/bugs.html])
57 AC_SUBST(enable_shared)
58 AC_SUBST(enable_static)
61 AM_ENABLE_MULTILIB(, ..)
64 # The same as in boehm-gc and libstdc++. Have to borrow it from there.
65 # We must force CC to /not/ be precious variables; otherwise
66 # the wrong, non-multilib-adjusted value will be used in multilibs.
67 # As a side effect, we have to subst CFLAGS ourselves.
69 m4_rename([_AC_ARG_VAR_PRECIOUS],[real_PRECIOUS])
70 m4_define([_AC_ARG_VAR_PRECIOUS],[])
72 m4_rename_force([real_PRECIOUS],[_AC_ARG_VAR_PRECIOUS])
78 if test "x$GCC" != "xyes"; then
79 AC_MSG_ERROR([libquadmath must be built with GCC])
83 # Calculate toolexeclibdir
84 # Also toolexecdir, though it's only used in toolexeclibdir
85 case ${version_specific_libs} in
87 # Need the gcc compiler version to know where to install libraries
88 # and header files if --enable-version-specific-runtime-libs option
90 toolexecdir='$(libdir)/gcc/$(target_alias)'
91 toolexeclibdir='$(toolexecdir)/$(gcc_version)$(MULTISUBDIR)'
94 if test -n "$with_cross_host" &&
95 test x"$with_cross_host" != x"no"; then
96 # Install a library built with a cross compiler in tooldir, not libdir.
97 toolexecdir='$(exec_prefix)/$(target_alias)'
98 toolexeclibdir='$(toolexecdir)/lib'
100 toolexecdir='$(libdir)/gcc-lib/$(target_alias)'
101 toolexeclibdir='$(libdir)'
103 multi_os_directory=`$CC -print-multi-os-directory`
104 case $multi_os_directory in
105 .) ;; # Avoid trailing /.
106 *) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;;
110 AC_SUBST(toolexecdir)
111 AC_SUBST(toolexeclibdir)
113 AC_CHECK_HEADERS(fenv.h)
115 # If available, sqrtl and cbrtl speed up the calculation -
116 # but they are not required
117 if test x$gcc_no_link != xyes; then
118 AC_CHECK_LIB([m],[sqrtl],[AC_DEFINE([HAVE_SQRTL],[1],[libm includes sqrtl])])
119 AC_CHECK_LIB([m],[cbrtl],[AC_DEFINE([HAVE_CBRTL],[1],[libm includes cbrtl])])
120 AC_CHECK_LIB([m],[feholdexcept],[AC_DEFINE([HAVE_FEHOLDEXCEPT],[1],[libm includes feholdexcept])])
121 AC_CHECK_LIB([m],[fesetround],[AC_DEFINE([HAVE_FESETROUND],[1],[libm includes fesetround])])
122 AC_CHECK_LIB([m],[feupdateenv],[AC_DEFINE([HAVE_FEUPDATEENV],[1],[libm includes feupdateenv])])
123 AC_CHECK_LIB([m],[fesetenv],[AC_DEFINE([HAVE_FESETENV],[1],[libm includes fesetenv])])
124 AC_CHECK_LIB([m],[fetestexcept],[AC_DEFINE([HAVE_FETESTEXCEPT],[1],[libm includes fetestexcept])])
126 if test "x$ac_cv_lib_m_sqrtl" = x""yes; then
127 AC_DEFINE([HAVE_SQRTL],[1],[libm includes sqrtl])
129 if test "x$ac_cv_lib_m_cbrtl" = x""yes; then
130 AC_DEFINE([HAVE_CBRTL],[1],[libm includes cbrtl])
132 if test "x$ac_cv_lib_m_feholdexcept" = x""yes; then
133 AC_DEFINE([HAVE_FEHOLDEXCEPT],[1],[libm includes feholdexcept])
135 if test "x$ac_cv_lib_m_fesetround" = x""yes; then
136 AC_DEFINE([HAVE_FESETROUND],[1],[libm includes fesetround])
138 if test "x$ac_cv_lib_m_feupdateenv" = x""yes; then
139 AC_DEFINE([HAVE_FEUPDATEENV],[1],[libm includes feupdateenv])
141 if test "x$ac_cv_lib_m_fesetenv" = x""yes; then
142 AC_DEFINE([HAVE_FESETENV],[1],[libm includes fesetenv])
144 if test "x$ac_cv_lib_m_fetestexcept" = x""yes; then
145 AC_DEFINE([HAVE_FETESTEXCEPT],[1],[libm includes fetestexcept])
149 # Check for symbol versioning (copied from libssp).
150 AC_MSG_CHECKING([whether symbol versioning is supported])
151 if test x$gcc_no_link = xyes; then
152 # If we cannot link, we cannot build shared libraries, so do not use
154 quadmath_use_symver=no
156 save_LDFLAGS="$LDFLAGS"
157 LDFLAGS="$LDFLAGS -fPIC -shared -Wl,--version-script,./conftest.map"
158 cat > conftest.map <<EOF
160 global: *foo*; bar; local: *;
163 AC_TRY_LINK([int foo;],[],[quadmath_use_symver=gnu],[quadmath_use_symver=no])
164 if test x$quadmath_use_symver = xno; then
167 LDFLAGS="$save_LDFLAGS"
168 LDFLAGS="$LDFLAGS -fPIC -shared -Wl,-M,./conftest.map"
169 # Sun ld cannot handle wildcards and treats all entries as undefined.
170 cat > conftest.map <<EOF
172 global: foo; local: *;
175 AC_TRY_LINK([int foo;],[],[quadmath_use_symver=sun],[quadmath_use_symver=no])
179 LDFLAGS="$save_LDFLAGS"
181 AC_MSG_RESULT($quadmath_use_symver)
182 AM_CONDITIONAL(LIBQUAD_USE_SYMVER, [test "x$quadmath_use_symver" != xno])
183 AM_CONDITIONAL(LIBQUAD_USE_SYMVER_GNU, [test "x$quadmath_use_symver" = xgnu])
184 AM_CONDITIONAL(LIBQUAD_USE_SYMVER_SUN, [test "x$quadmath_use_symver" = xsun])
186 AC_CACHE_CHECK([whether __float128 is supported], [libquad_cv_have_float128],
187 [GCC_TRY_COMPILE_OR_LINK([
188 typedef _Complex float __attribute__((mode(TC))) __complex128;
190 __float128 foo (__float128 x)
199 return (__float128) z2;
202 __float128 bar (__float128 x)
204 return x * __builtin_huge_valq ();
210 libquad_cv_have_float128=yes
212 libquad_cv_have_float128=no
214 AM_CONDITIONAL(BUILD_LIBQUADMATH, [test "x$libquad_cv_have_float128" = xyes])
218 if test ${multilib} = yes; then
219 multilib_arg="--enable-multilib"
225 # We would like our source tree to be readonly. However when releases or
226 # pre-releases are generated, the flex/bison generated files as well as the
227 # various formats of manuals need to be included along with the rest of the
228 # sources. Therefore we have --enable-generated-files-in-srcdir to do
230 AC_MSG_CHECKING(generated-files-in-srcdir)
231 AC_ARG_ENABLE(generated-files-in-srcdir,
232 AS_HELP_STRING([--enable-generated-files-in-srcdir],
233 [put copies of generated files in source dir intended for creating source tarballs for users without texinfo bison or flex]),
234 [case "$enableval" in
235 yes) enable_generated_files_in_srcdir=yes ;;
236 no) enable_generated_files_in_srcdir=no ;;
237 *) AC_MSG_ERROR([Unknown argument to enable/disable version-specific libs]);;
239 [enable_generated_files_in_srcdir=no])
240 AC_MSG_RESULT($enable_generated_files_in_srcdir)
241 AM_CONDITIONAL(GENINSRC, test "$enable_generated_files_in_srcdir" = yes)
244 AC_CONFIG_FILES(Makefile)