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| author | Pau Espin Pedrol <pespin@sysmocom.de> | 2019-08-06 12:46:46 +0200 |
|---|---|---|
| committer | Pau Espin Pedrol <pespin@sysmocom.de> | 2019-08-06 12:50:26 +0200 |
| commit | afce89dac1a3cdb975da72020acdba16940fd679 (patch) | |
| tree | b018fbf0d2d753179415bcb052c4a32c7dc21330 /m4 | |
| parent | e188b8cd98f599468fbb200c7d590de955daf761 (diff) | |
configure: Allow disabling workaround for TLS bug in old ARM gcc versions
Some toolchains (such as sysmobts 201705 one) containing the TLS bug on
old ARM gcc versions (<7.3.0) also crash if the initial workaround found
is aplied (CFLAGS="-mtls-dialect=gnu2"). In that scenario, let's provide
a way to disable the workaround (to avoid "ld" crashing) and warn the
user about requirement to build with -O0 to avoid runtime crashes.
Related: OS#4062
Related: SYS#4628
Change-Id: I04ff8c702eabcf4f6e7b59e11aece2744267cefe
Diffstat (limited to 'm4')
| -rw-r--r-- | m4/check_tls_gcc_arm_bug.m4 | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/m4/check_tls_gcc_arm_bug.m4 b/m4/check_tls_gcc_arm_bug.m4 index 73b3e957..cee20e65 100644 --- a/m4/check_tls_gcc_arm_bug.m4 +++ b/m4/check_tls_gcc_arm_bug.m4 @@ -27,3 +27,25 @@ AC_DEFUN([CHECK_TLS_GCC_ARM_BUG], [ AC_SUBST([TLS_GCC_ARM_BUG_CFLAGS]) AC_MSG_RESULT([$TLS_GCC_ARM_BUG_CFLAGS]) ]) + +# Allow disabling the check in order to workaround bug by letting user pass +# CFLAGS="-O0" on toolchains that crash when "-mtls-dialect=gnu2" is used. +# CFLAGS is updated with workaround if detection is enabled and workaround is needed. +AC_DEFUN([ARG_ENABLE_DETECT_TLS_GCC_ARM_BUG], [ + AC_ARG_ENABLE(detect_tls_gcc_arm_bug, + [AS_HELP_STRING( + [--disable-detect-tls-gcc-arm-bug], + [Disable detecting and applying workaround for TLS bug on ARM platform for GCC < 7.3.0] + )], + [detect_tls_gcc_arm_bug=$enableval], [detect_tls_gcc_arm_bug="yes"]) + if test x"$detect_tls_gcc_arm_bug" = x"yes"; then + CHECK_TLS_GCC_ARM_BUG + if test "x$TLS_GCC_ARM_BUG_CFLAGS" != "x"; then + CFLAGS="$CFLAGS $TLS_GCC_ARM_BUG_CFLAGS" + AC_MSG_WARN([Applying workaround for TLS bug on ARM platform for GCC < 7.3.0 + ($TLS_GCC_ARM_BUG_CFLAGS). On some toolchain versions, ld may + crash. In that case you must build with CFLAGS='-O0' and run + ./configure with --disable-detect-tls-gcc-arm-bug]) + fi +fi +]) |