Patch from Enrico WEIGELT <weigelt@metux.de> to disable __cxa_atexit for those C libraries with no support (old uClibc).

CREDITS

@@ -6,4 +6,11 @@ I would like to thank these fine people for making crosstool-NG possible:
     Some crosstool-NG scripts have code snippets coming almost as-is from the
     original work by Dan.
 
+  Allan CLARK for his investigations on building toolchains on MacOS-X.
+    Allan made extensive tests of the first alpha of ct-ng on his MacOS-X
+    and unveiled some bash-2.05 weirdness.
+
+  Enrico WEIGELT for some improvements of the build procedure:
+    - cxa_atexit disabling for C libraries not supporting it (uClibc)
+
 More to come as they help.

config/cc_gcc.in

@@ -128,6 +128,14 @@ config CC_VERSION
 # CT_INSERT_VERSION_STRING_ABOVE
 # Don't remove above line!
 
+config CC_CXA_ATEXIT
+    bool
+    prompt "__cxa_atexit"
+    default "y"
+    help
+      If you get the missing symbol "__cxa_atexit" when building c++ programs,
+      you might want to try disabling this option.
+
 config CC_EXTRA_CONFIG
     string
     prompt "Final gcc extra config"

scripts/build/cc_core_gcc.sh

@@ -20,6 +20,7 @@ do_cc_core() {
     [ -n "${CT_ARCH_TUNE}" ] && extra_config="${extra_config} --with-tune=${CT_ARCH_TUNE}"
     [ -n "${CT_ARCH_ARCH}" ] && extra_config="${extra_config} --with-arch=${CT_ARCH_ARCH}"
     [ -n "${CT_ARCH_FPU}" ] && extra_config="${extra_config} --with-fpu=${CT_ARCH_FPU}"
+    [ "${CT_CC_CXA_ATEXIT}" == "y" ] && extra_config="${extra_config} --enable-__cxa_atexit"
 
     CT_DoLog DEBUG "Extra config passed: \"${extra_config}\""
 
@@ -38,7 +39,6 @@ do_cc_core() {
         --disable-nls                               \
         --enable-threads=no                         \
         --enable-symvers=gnu                        \
-        --enable-__cxa_atexit                       \
         --enable-languages=c                        \
         --disable-shared                            \
         ${CT_CC_CORE_EXTRA_CONFIG}                  2>&1 |CT_DoLog DEBUG

scripts/build/cc_gcc.sh

@@ -38,6 +38,7 @@ do_cc() {
     else
        extra_config="${extra_config} --disable-multilib"
     fi
+    [ "${CT_CC_CXA_ATEXIT}" == "y" ] && extra_config="${extra_config} --enable-__cxa_atexit"
 
     CT_DoLog DEBUG "Extra config passed: \"${extra_config}\""
 
@@ -56,7 +57,6 @@ do_cc() {
         --disable-nls                           \
         --enable-threads=posix                  \
         --enable-symvers=gnu                    \
-        --enable-__cxa_atexit                   \
         --enable-c99                            \
         --enable-long-long                      \
         ${CT_CC_EXTRA_CONFIG}                   2>&1 |CT_DoLog DEBUG