diff options
Diffstat (limited to 'libgcc/configure.ac')
| -rw-r--r-- | libgcc/configure.ac | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/libgcc/configure.ac b/libgcc/configure.ac index c1a3dce0f5b..b40e6d733d6 100644 --- a/libgcc/configure.ac +++ b/libgcc/configure.ac @@ -180,6 +180,60 @@ AC_SUBST(fixed_point) # config.gcc also contains tests of with_system_libunwind. GCC_CHECK_UNWIND_GETIPINFO +# The sjlj test is almost duplicated here and in libgo/configure.ac (for C), +# libstdc++-v3/acinclude.m4 and libjava/configure.ac (for C++), and +# libobjc/configure.ac (for Objective-C). +# FIXME: This should be centralized in config/sjlj.m4. +AC_ARG_ENABLE(sjlj-exceptions, + AC_HELP_STRING([--enable-sjlj-exceptions], + [force use of builtin_setjmp for exceptions]), + [case "$enableval" in + yes|no|auto) ;; + *) AC_MSG_ERROR([unknown argument to --enable-sjlj-exceptions]) ;; + esac], + [enable_sjlj_exceptions=auto]) + +AC_CACHE_CHECK([whether to use setjmp/longjmp exceptions], +[libgcc_cv_lib_sjlj_exceptions], +[AC_LANG_CONFTEST( + [AC_LANG_SOURCE([ +void bar (); +void clean (int *); +void foo () +{ + int i __attribute__ ((cleanup (clean))); + bar(); +} +])]) +CFLAGS_hold=$CFLAGS +CFLAGS="--save-temps -fexceptions" +libgcc_cv_lib_sjlj_exceptions=unknown +AS_IF([ac_fn_c_try_compile], + [if grep _Unwind_SjLj_Resume conftest.s >/dev/null 2>&1; then + libgcc_cv_lib_sjlj_exceptions=yes + elif grep _Unwind_Resume conftest.s >/dev/null 2>&1; then + libgcc_cv_lib_sjlj_exceptions=no + fi]) +CFLAGS=$CFLAGS_hold +rm -f conftest* +]) + +if test "$enable_sjlj_exceptions" = "auto"; then + enable_sjlj_exceptions=$libgcc_cv_lib_sjlj_exceptions +fi + +case $enable_sjlj_exceptions in +yes) + AC_DEFINE(LIBGCC_SJLJ_EXCEPTIONS, 1, + [Define if the C compiler is configured for setjmp/longjmp exceptions.]) + ;; +no) + ;; +*) + AC_MSG_ERROR([unable to detect exception model]) + ;; +esac + AC_LIB_PROG_LD_GNU AC_MSG_CHECKING([for thread model used by GCC]) |