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-$host_alias}
27 AC_SUBST(target_alias)
29 AM_INIT_AUTOMAKE([1.9.0 foreign subdir-objects no-dist -Wall -Werror])
31 AC_MSG_CHECKING([for --enable-version-specific-runtime-libs])
32 AC_ARG_ENABLE(version-specific-runtime-libs,
33 AS_HELP_STRING([--enable-version-specific-runtime-libs],
34 [specify that runtime libraries should be installed in a compiler-specific directory]),
36 yes) version_specific_libs=yes ;;
37 no) version_specific_libs=no ;;
38 *) AC_MSG_ERROR([Unknown argument to enable/disable version-specific libs]);;
40 [version_specific_libs=no])
41 AC_MSG_RESULT($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 $gcc_cv_prog_makeinfo_modern = "yes")
56 AC_SUBST(enable_shared)
57 AC_SUBST(enable_static)
60 AM_ENABLE_MULTILIB(, ..)
63 # The same as in boehm-gc and libstdc++. Have to borrow it from there.
64 # We must force CC to /not/ be precious variables; otherwise
65 # the wrong, non-multilib-adjusted value will be used in multilibs.
66 # As a side effect, we have to subst CFLAGS ourselves.
68 m4_rename([_AC_ARG_VAR_PRECIOUS],[real_PRECIOUS])
69 m4_define([_AC_ARG_VAR_PRECIOUS],[])
71 m4_rename_force([real_PRECIOUS],[_AC_ARG_VAR_PRECIOUS])
77 if test "x$GCC" != "xyes"; then
78 AC_MSG_ERROR([libquadmath must be built with GCC])
82 # Calculate toolexeclibdir
83 # Also toolexecdir, though it's only used in toolexeclibdir
84 case ${version_specific_libs} in
86 # Need the gcc compiler version to know where to install libraries
87 # and header files if --enable-version-specific-runtime-libs option
89 toolexecdir='$(libdir)/gcc/$(target_alias)'
90 toolexeclibdir='$(toolexecdir)/$(gcc_version)$(MULTISUBDIR)'
93 if test -n "$with_cross_host" &&
94 test x"$with_cross_host" != x"no"; then
95 # Install a library built with a cross compiler in tooldir, not libdir.
96 toolexecdir='$(exec_prefix)/$(target_alias)'
97 toolexeclibdir='$(toolexecdir)/lib'
99 toolexecdir='$(libdir)/gcc-lib/$(target_alias)'
100 toolexeclibdir='$(libdir)'
102 multi_os_directory=`$CC -print-multi-os-directory`
103 case $multi_os_directory in
104 .) ;; # Avoid trailing /.
105 *) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;;
109 AC_SUBST(toolexecdir)
110 AC_SUBST(toolexeclibdir)
112 AC_CHECK_LIB([m],[sqrtl],[AC_DEFINE([HAVE_SQRTL],[1],[libm includes sqrtl])])
113 AC_CHECK_LIB([m],[cbrtl],[AC_DEFINE([HAVE_CBRTL],[1],[libm includes cbrtl])])
115 # Check for symbol versioning (copied from libssp).
116 AC_MSG_CHECKING([whether symbol versioning is supported])
117 if test x$gcc_no_link = xyes; then
118 # If we cannot link, we cannot build shared libraries, so do not use
120 quadmath_use_symver=no
122 save_LDFLAGS="$LDFLAGS"
123 LDFLAGS="$LDFLAGS -fPIC -shared -Wl,--version-script,./conftest.map"
124 cat > conftest.map <<EOF
126 global: *foo*; bar; local: *;
129 AC_TRY_LINK([int foo;],[],[quadmath_use_symver=gnu],[quadmath_use_symver=no])
130 if test x$quadmath_use_symver = xno; then
133 LDFLAGS="$save_LDFLAGS"
134 LDFLAGS="$LDFLAGS -fPIC -shared -Wl,-M,./conftest.map"
135 # Sun ld cannot handle wildcards and treats all entries as undefined.
136 cat > conftest.map <<EOF
138 global: foo; local: *;
141 AC_TRY_LINK([int foo;],[],[quadmath_use_symver=sun],[quadmath_use_symver=no])
145 LDFLAGS="$save_LDFLAGS"
147 AC_MSG_RESULT($quadmath_use_symver)
148 AM_CONDITIONAL(LIBQUAD_USE_SYMVER, [test "x$quadmath_use_symver" != xno])
149 AM_CONDITIONAL(LIBQUAD_USE_SYMVER_GNU, [test "x$quadmath_use_symver" = xgnu])
150 AM_CONDITIONAL(LIBQUAD_USE_SYMVER_SUN, [test "x$quadmath_use_symver" = xsun])
152 AC_MSG_CHECKING([whether __float128 is supported])
154 typedef _Complex float __attribute__((mode(TC))) __complex128;
156 __float128 foo (__float128 x)
165 return (__float128) z2;
168 __float128 bar (__float128 x)
170 return x * __builtin_huge_valq ();
176 libquad_have_float128=yes
178 libquad_have_float128=no
180 AC_MSG_RESULT([$libquad_have_float128])
183 dnl Enable the following for a stand-alone library:
185 dnl if test $libquad_have_float128 = no; then
186 dnl AC_MSG_ERROR([__float128 support is required to build this library.])
189 AM_CONDITIONAL(BUILD_LIBQUADMATH, [test "x$libquad_have_float128" = xyes])
193 if test ${multilib} = yes; then
194 multilib_arg="--enable-multilib"
200 # We would like our source tree to be readonly. However when releases or
201 # pre-releases are generated, the flex/bison generated files as well as the
202 # various formats of manuals need to be included along with the rest of the
203 # sources. Therefore we have --enable-generated-files-in-srcdir to do
205 AC_MSG_CHECKING(generated-files-in-srcdir)
206 AC_ARG_ENABLE(generated-files-in-srcdir,
207 AS_HELP_STRING([--enable-generated-files-in-srcdir],
208 [put copies of generated files in source dir intended for creating source tarballs for users without texinfo bison or flex]),
209 [case "$enableval" in
210 yes) enable_generated_files_in_srcdir=yes ;;
211 no) enable_generated_files_in_srcdir=no ;;
212 *) AC_MSG_ERROR([Unknown argument to enable/disable version-specific libs]);;
214 [enable_generated_files_in_srcdir=no])
215 AC_MSG_RESULT($enable_generated_files_in_srcdir)
216 AM_CONDITIONAL(GENINSRC, test "$enable_generated_files_in_srcdir" = yes)
219 AC_CONFIG_FILES(Makefile)