diff options
Diffstat (limited to 'sysdeps/powerpc/powerpc64/le/configure.ac')
-rw-r--r-- | sysdeps/powerpc/powerpc64/le/configure.ac | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/sysdeps/powerpc/powerpc64/le/configure.ac b/sysdeps/powerpc/powerpc64/le/configure.ac index 7f2c9fbf1f..6dabd9be6b 100644 --- a/sysdeps/powerpc/powerpc64/le/configure.ac +++ b/sysdeps/powerpc/powerpc64/le/configure.ac @@ -17,4 +17,39 @@ AS_IF([test "$libc_cv_target_power8_ok" != "yes"], [critic_missing="$critic_missing POWER8 or newer is required on powerpc64le."]) CFLAGS="$OLD_CFLAGS" +dnl Require support for -mno-gnu-attribute +OLD_CFLAGS="$CFLAGS" +CFLAGS="$CFLAGS -mno-gnu-attribute" +AC_CACHE_CHECK([if the compiler supports -mno-gnu-attribute], + libc_cv_no_gnu_attr_ok, [ +AC_COMPILE_IFELSE([AC_LANG_SOURCE([[ +]])], + [libc_cv_no_gnu_attr_ok=yes], + [libc_cv_no_gnu_attr_ok=no])]) +AS_IF([test "$libc_cv_no_gnu_attr_ok" != "yes"], + [critic_missing="$critic_missing A compiler with -mno-gnu-attribute is required on powerpc64le."]) +CFLAGS="$OLD_CFLAGS" + +dnl Some old compiler versions give error for the function signbit() for +dnl 128-bit floating point types. This is fixed by PR83862 and backported +dnl to gcc6 and gcc7. This test is to check if we are using the compiler +dnl that has this bug (fixed in GCC 8.0, backported to 7.4). +AC_CACHE_CHECK([if $CC compiles signbit with 128-bit floating point type], + libc_cv_compiler_powerpc64le_ice, [dnl +save_CFLAGS="$CFLAGS" +CFLAGS="$CFLAGS -mabi=ieeelongdouble -Wno-psabi" +AC_COMPILE_IFELSE([AC_LANG_SOURCE([[ +int sbr (long double a) { return __builtin_signbit (a); } +int sbm (long double *a) { return __builtin_signbit (*a); } +int sbo (long double *a) { return __builtin_signbit (a[4]); } +int sbi (long double *a, unsigned long n) { return __builtin_signbit (a[n]); } +void sbs (int *p, long double a) { *p = __builtin_signbit (a); } +]])], + [libc_cv_compiler_powerpc64le_ice=yes], + [libc_cv_compiler_powerpc64le_ice=no]) +CFLAGS="$save_CFLAGS"]) +AS_IF([test "$libc_cv_compiler_powerpc64le_ice" != "yes"], + [critic_missing="$critic_missing __builtin_signbit is broken. GCC 7.4 or newer is required to resolve (PR83862)."]) + + test -n "$critic_missing" && AC_MSG_ERROR([*** $critic_missing]) |