Add a new config knob for gcc: usage of SJLJ to handle exceptions.

This is needed for some architectures to compile the Java frontend (eg. ARM with uClibc).

 /trunk/config/cc/gcc.in        |   41    39     2     0 +++++++++++++++++++++++++++++++++++++++--
 /trunk/scripts/build/cc_gcc.sh |    8     5     3     0 +++++---
 2 files changed, 44 insertions(+), 5 deletions(-)

config/cc/gcc.in

@@ -129,12 +129,49 @@ config CC_GCC_4_3_or_later
 
 config CC_CXA_ATEXIT
     bool
-    prompt "__cxa_atexit"
+    prompt "Use __cxa_atexit"
-    default "y"
+    default y
     help
       If you get the missing symbol "__cxa_atexit" when building C++ programs,
       you might want to try disabling this option.
 
+choice
+    bool
+    prompt "Use sjlj for exceptions"
+    default CC_SJLJ_EXCEPTIONS_CONFIGURE
+
+# This config option is used nowhere in the code on purpose.
+# It only serves as a choice entry to force neither using nor not using sjlj
+config CC_SJLJ_EXCEPTIONS_CONFIGURE
+    bool
+    prompt "Let configure decide"
+    help
+      Let configure decide if setjmp/longjmp should be used to handle
+      exceptions.
+      
+      Choose that if you trust configure to detect the correct settings.
+      This is the default choice.
+
+config CC_SJLJ_EXCEPTIONS_USE
+    bool
+    prompt "Force using sjlj"
+    help
+      Do use setjmp/longjmp for exceptions.
+      This is gcc's --enable-sjlj-exceptions configure switch.
+      
+      Choose that if you want to use setjmp/longjmp to handle exceptions.
+
+config CC_SJLJ_EXCEPTIONS_DONT_USE
+    bool
+    prompt "Force not using sjlj"
+    help
+      Do not use setjmp/longjmp for exceptions.
+      This is gcc's --disable-sjlj-exceptions configure switch.
+      
+      Choose that if you want to not use setjmp/longjmp to handle exceptions.
+
+endchoice
+
 config CC_CORE_EXTRA_CONFIG
     string
     prompt "Core gcc extra config"

scripts/build/cc_gcc.sh

@@ -288,6 +288,8 @@ do_cc() {
     [ "${CT_GMP_MPFR}" = "y" ]                      && extra_config="${extra_config} --with-gmp=${CT_PREFIX_DIR} --with-mpfr=${CT_PREFIX_DIR}"
     [ -n "${CT_CC_PKGVERSION}" ]                    && extra_config="${extra_config} --with-pkgversion=${CT_CC_PKGVERSION}"
     [ -n "${CT_CC_BUGURL}" ]                        && extra_config="${extra_config} --with-bugurl=${CT_CC_BUGURL}"
+    [ "${CT_CC_SJLJ_EXCEPTIONS_USE}" = "y" ]        && extra_config="${extra_config} --enable-sjlj-exceptions"
+    [ "${CT_CC_SJLJ_EXCEPTIONS_DONT_USE}" = "y" ]   && extra_config="${extra_config} --disable-sjlj-exceptions"
     if [ "${CT_CC_CXA_ATEXIT}" = "y" ]; then
         extra_config="${extra_config} --enable-__cxa_atexit"
     else