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authorGabriel F. T. Gomes <gftg@linux.vnet.ibm.com>2016-10-11 13:50:19 -0300
committerGabriel F. T. Gomes <gftg@linux.vnet.ibm.com>2017-06-26 14:58:47 -0300
commit4efe3ce400d763b6c8186dd389371f6359b05c54 (patch)
treedf3a5d8b3f6fe68bcee0181b50282a8e3250ccc0
parentd54bb9b1d3fd25779fba2c403003c5097ba9af73 (diff)
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powerpc64le: Check for compiler features for float128
On powerpc64le, support for float128 will be enabled, which requires some compiler features to be present. This patch adds a configure test to check for such features, which are provided for powerpc64le since GCC 6.2. Tested for powerpc64 and powerpc64le. * INSTALL: Regenerate. * manual/install.texi (Recommended Tools for Compilation): Mention the powerpc64le-specific requirement in the manual. * sysdeps/powerpc/powerpc64le/configure.ac: New file with checks for the compiler features required for building float128. * sysdeps/powerpc/powerpc64le/configure: New, auto-generated file.
-rw-r--r--ChangeLog10
-rw-r--r--INSTALL5
-rw-r--r--manual/install.texi4
-rw-r--r--sysdeps/powerpc/powerpc64le/configure45
-rw-r--r--sysdeps/powerpc/powerpc64le/configure.ac32
5 files changed, 96 insertions, 0 deletions
diff --git a/ChangeLog b/ChangeLog
index 9e19f62d9d..e0968afc8b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,13 @@
+2017-06-26 Gabriel F. T. Gomes <gftg@linux.vnet.ibm.com>
+ Tulio Magno Quites Machado Filho <tuliom@linux.vnet.ibm.com>
+
+ * INSTALL: Regenerate.
+ * manual/install.texi (Recommended Tools for Compilation): Mention
+ the powerpc64le-specific requirement in the manual.
+ * sysdeps/powerpc/powerpc64le/configure.ac: New file with checks
+ for the compiler features required for building float128.
+ * sysdeps/powerpc/powerpc64le/configure: New, auto-generated file.
+
2017-06-26 Tulio Magno Quites Machado Filho <tuliom@linux.vnet.ibm.com>
* malloc/tst-alloc_buffer.c (test_misaligned): Cast to char
diff --git a/INSTALL b/INSTALL
index 71af35b1eb..4e05e9922b 100644
--- a/INSTALL
+++ b/INSTALL
@@ -428,6 +428,11 @@ build the GNU C Library:
better code. As of release time, GCC 6.3 is the newest compiler
verified to work to build the GNU C Library.
+ For PowerPC 64-bits little-endian (powerpc64le), GCC 6.2 or higher
+ is required. This compiler version is the first to provide the
+ features required for building the GNU C Library with support for
+ '_Float128'.
+
For multi-arch support it is recommended to use a GCC which has
been built with support for GNU indirect functions. This ensures
that correct debugging information is generated for functions
diff --git a/manual/install.texi b/manual/install.texi
index 65174a8b2e..ff5661a4fd 100644
--- a/manual/install.texi
+++ b/manual/install.texi
@@ -475,6 +475,10 @@ the newest version of the compiler that is known to work for building
release time, GCC 6.3 is the newest compiler verified to work to build
@theglibc{}.
+For PowerPC 64-bits little-endian (powerpc64le), GCC 6.2 or higher is
+required. This compiler version is the first to provide the features
+required for building @theglibc{} with support for @code{_Float128}.
+
For multi-arch support it is recommended to use a GCC which has been built with
support for GNU indirect functions. This ensures that correct debugging
information is generated for functions selected by IFUNC resolvers. This
diff --git a/sysdeps/powerpc/powerpc64le/configure b/sysdeps/powerpc/powerpc64le/configure
new file mode 100644
index 0000000000..78208d2eda
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64le/configure
@@ -0,0 +1,45 @@
+# This file is generated from configure.ac by Autoconf. DO NOT EDIT!
+ # Local configure fragment for sysdeps/powerpc/powerpc64le.
+
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking if $CC supports binary128 floating point type" >&5
+$as_echo_n "checking if $CC supports binary128 floating point type... " >&6; }
+if ${libc_cv_compiler_powerpc64le_binary128_ok+:} false; then :
+ $as_echo_n "(cached) " >&6
+else
+ save_CFLAGS="$CFLAGS"
+CFLAGS="$CFLAGS -Werror -mfloat128"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h. */
+
+__float128 a, b, c, d, e;
+int i;
+
+__float128
+foobar (__float128 x)
+{
+ a = __builtin_nansq ("0");
+ b = __builtin_huge_valq ();
+ c = __builtin_infq ();
+ d = __builtin_fabsq (x);
+ e = __builtin_nanq ("0");
+ i = __builtin_signbit (x);
+ return __builtin_copysignq (x, x);
+}
+
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+ libc_cv_compiler_powerpc64le_binary128_ok=yes
+else
+ libc_cv_compiler_powerpc64le_binary128_ok=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+CFLAGS="$save_CFLAGS"
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_compiler_powerpc64le_binary128_ok" >&5
+$as_echo "$libc_cv_compiler_powerpc64le_binary128_ok" >&6; }
+if test "$libc_cv_compiler_powerpc64le_binary128_ok" != "yes"; then :
+ critic_missing="$critic_missing binary128 floating point type (GCC >= 6.2) is required on powerpc64le."
+fi
+
+test -n "$critic_missing" && as_fn_error $? "*** $critic_missing" "$LINENO" 5
diff --git a/sysdeps/powerpc/powerpc64le/configure.ac b/sysdeps/powerpc/powerpc64le/configure.ac
new file mode 100644
index 0000000000..e88e224ae1
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64le/configure.ac
@@ -0,0 +1,32 @@
+GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
+# Local configure fragment for sysdeps/powerpc/powerpc64le.
+
+dnl Require binary128 floating point support on powerpc64le (available in
+dnl GCC 6.2).
+AC_CACHE_CHECK([if $CC supports binary128 floating point type],
+ libc_cv_compiler_powerpc64le_binary128_ok, [dnl
+save_CFLAGS="$CFLAGS"
+CFLAGS="$CFLAGS -Werror -mfloat128"
+AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
+__float128 a, b, c, d, e;
+int i;
+
+__float128
+foobar (__float128 x)
+{
+ a = __builtin_nansq ("0");
+ b = __builtin_huge_valq ();
+ c = __builtin_infq ();
+ d = __builtin_fabsq (x);
+ e = __builtin_nanq ("0");
+ i = __builtin_signbit (x);
+ return __builtin_copysignq (x, x);
+}
+]])],
+ [libc_cv_compiler_powerpc64le_binary128_ok=yes],
+ [libc_cv_compiler_powerpc64le_binary128_ok=no])
+CFLAGS="$save_CFLAGS"])
+AS_IF([test "$libc_cv_compiler_powerpc64le_binary128_ok" != "yes"],
+ [critic_missing="$critic_missing binary128 floating point type (GCC >= 6.2) is required on powerpc64le."])
+
+test -n "$critic_missing" && AC_MSG_ERROR([*** $critic_missing])