diff options
Diffstat (limited to 'libgcc/configure.ac')
| -rw-r--r-- | libgcc/configure.ac | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/libgcc/configure.ac b/libgcc/configure.ac index 710f15a..79d0ea4 100644 --- a/libgcc/configure.ac +++ b/libgcc/configure.ac @@ -320,6 +320,25 @@ mips*-*-*) [libgcc_cv_mips_hard_float=no])]) esac +# Determine the version of glibc, if any, used on the target. +AC_MSG_CHECKING([for target glibc version]) +AC_ARG_WITH([glibc-version], + [AS_HELP_STRING([--with-glibc-version=M.N], + [assume GCC used with glibc version M.N or later])], [ +if [echo "$with_glibc_version" | grep '^[0-9][0-9]*\.[0-9][0-9]*$']; then + glibc_version_major=`echo "$with_glibc_version" | sed -e 's/\..*//'` + glibc_version_minor=`echo "$with_glibc_version" | sed -e 's/.*\.//'` +else + AC_MSG_ERROR([option --with-glibc-version requires a version number M.N]) +fi], [ +AC_COMPUTE_INT([glibc_version_major], [__GLIBC__], + [#include <features.h>], + [glibc_version_major=0]) +AC_COMPUTE_INT([glibc_version_minor], [__GLIBC_MINOR__], + [#include <features.h>], + [glibc_version_minor=0])]) +AC_MSG_RESULT([$glibc_version_major.$glibc_version_minor]) + # Determine floating-point type for powerpc*-*-linux*. # Single-precision-only FPRs are not a supported configuration for # this target, so are not allowed for in this test. @@ -340,6 +359,20 @@ ppc_fp_type=hard EOF eval `${CC-cc} -E conftest.c | grep ppc_fp_type=` rm -f conftest.c +# glibc 2.19 and later provide all the soft-fp functions, with proper +# interactions with <fenv.h> exception and rounding mode handling, so +# make libgcc's versions into compat symbols if a recent enough glibc +# version is being used. +ppc_fp_compat= +case ${ppc_fp_type} in +soft|e500v1|e500v2) + if test $glibc_version_major -gt 2 \ + || ( test $glibc_version_major -eq 2 \ + && test $glibc_version_minor -ge 19 ); then + ppc_fp_compat="t-softfp-compat" + fi + ;; +esac ;; esac |