diff options
Diffstat (limited to 'm4')
| -rw-r--r-- | m4/check_tls_gcc_arm_bug.m4 | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/m4/check_tls_gcc_arm_bug.m4 b/m4/check_tls_gcc_arm_bug.m4 new file mode 100644 index 00000000..73b3e957 --- /dev/null +++ b/m4/check_tls_gcc_arm_bug.m4 @@ -0,0 +1,29 @@ +# OS#4062 (https://osmocom.org/issues/4062) +# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81142 +# SYS#4628 + +# Check if We need to apply workaround for TLS bug on ARM platform for GCC < 7.3.0. +# TLS_GCC_ARM_BUG_CFLAGS is filled with required workaround bits if needed. + +AC_DEFUN([CHECK_TLS_GCC_ARM_BUG], [ + TLS_GCC_ARM_BUG_CFLAGS="" + AC_MSG_CHECKING([whether to workaround TLS bug in old gcc on ARM platforms]) + AC_COMPILE_IFELSE([AC_LANG_PROGRAM( + [[ + #define GCC_VERSION (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) + /* Check for ARM 32 bit and gcc smaller than 7.3.0 */ + /* We need to explicitly exclude GNUC compatible compilers, since they also define GNUC related tokens */ + #if __arm__ && \ + !defined(__clang__) && !defined(__llvm__) && !defined(__INTEL_COMPILER) && \ + defined(__GNUC__) && GCC_VERSION < 70300 + #error TLS bug present! + #endif + ]])], + [tls_bug_present=no], + [tls_bug_present=yes]) + AS_IF([test "x$tls_bug_present" = "xyes"],[ + TLS_GCC_ARM_BUG_CFLAGS="-mtls-dialect=gnu2" + ]) + AC_SUBST([TLS_GCC_ARM_BUG_CFLAGS]) + AC_MSG_RESULT([$TLS_GCC_ARM_BUG_CFLAGS]) +]) |