| Pau Espin Pedrol | e188b8c | 2019-08-05 13:46:33 +0200 | [diff] [blame] | 1 | # OS#4062 (https://osmocom.org/issues/4062) |
| 2 | # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81142 |
| 3 | # SYS#4628 |
| 4 | |
| 5 | # Check if We need to apply workaround for TLS bug on ARM platform for GCC < 7.3.0. |
| 6 | # TLS_GCC_ARM_BUG_CFLAGS is filled with required workaround bits if needed. |
| 7 | |
| 8 | AC_DEFUN([CHECK_TLS_GCC_ARM_BUG], [ |
| 9 | TLS_GCC_ARM_BUG_CFLAGS="" |
| 10 | AC_MSG_CHECKING([whether to workaround TLS bug in old gcc on ARM platforms]) |
| 11 | AC_COMPILE_IFELSE([AC_LANG_PROGRAM( |
| 12 | [[ |
| 13 | #define GCC_VERSION (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) |
| 14 | /* Check for ARM 32 bit and gcc smaller than 7.3.0 */ |
| 15 | /* We need to explicitly exclude GNUC compatible compilers, since they also define GNUC related tokens */ |
| 16 | #if __arm__ && \ |
| 17 | !defined(__clang__) && !defined(__llvm__) && !defined(__INTEL_COMPILER) && \ |
| 18 | defined(__GNUC__) && GCC_VERSION < 70300 |
| 19 | #error TLS bug present! |
| 20 | #endif |
| 21 | ]])], |
| 22 | [tls_bug_present=no], |
| 23 | [tls_bug_present=yes]) |
| 24 | AS_IF([test "x$tls_bug_present" = "xyes"],[ |
| 25 | TLS_GCC_ARM_BUG_CFLAGS="-mtls-dialect=gnu2" |
| 26 | ]) |
| 27 | AC_SUBST([TLS_GCC_ARM_BUG_CFLAGS]) |
| 28 | AC_MSG_RESULT([$TLS_GCC_ARM_BUG_CFLAGS]) |
| 29 | ]) |
| Pau Espin Pedrol | afce89d | 2019-08-06 12:46:46 +0200 | [diff] [blame] | 30 | |
| 31 | # Allow disabling the check in order to workaround bug by letting user pass |
| 32 | # CFLAGS="-O0" on toolchains that crash when "-mtls-dialect=gnu2" is used. |
| 33 | # CFLAGS is updated with workaround if detection is enabled and workaround is needed. |
| 34 | AC_DEFUN([ARG_ENABLE_DETECT_TLS_GCC_ARM_BUG], [ |
| 35 | AC_ARG_ENABLE(detect_tls_gcc_arm_bug, |
| 36 | [AS_HELP_STRING( |
| 37 | [--disable-detect-tls-gcc-arm-bug], |
| 38 | [Disable detecting and applying workaround for TLS bug on ARM platform for GCC < 7.3.0] |
| 39 | )], |
| 40 | [detect_tls_gcc_arm_bug=$enableval], [detect_tls_gcc_arm_bug="yes"]) |
| 41 | if test x"$detect_tls_gcc_arm_bug" = x"yes"; then |
| 42 | CHECK_TLS_GCC_ARM_BUG |
| 43 | if test "x$TLS_GCC_ARM_BUG_CFLAGS" != "x"; then |
| 44 | CFLAGS="$CFLAGS $TLS_GCC_ARM_BUG_CFLAGS" |
| 45 | AC_MSG_WARN([Applying workaround for TLS bug on ARM platform for GCC < 7.3.0 |
| 46 | ($TLS_GCC_ARM_BUG_CFLAGS). On some toolchain versions, ld may |
| 47 | crash. In that case you must build with CFLAGS='-O0' and run |
| 48 | ./configure with --disable-detect-tls-gcc-arm-bug]) |
| 49 | fi |
| 50 | fi |
| 51 | ]) |