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committed 50c02bd72b1xxxxxxxxxxAllow C99-depending features of libstdc++ with uClibcThe libstdc++ code is fairly restrictive on how it checks for C99compatibility: it requires *complete* C99 support to enable certainfeatures. For example, uClibc provides a good number of C99 features,but not C99 complex number support. For this reason, libstdc++completely disables many the standard C++ methods that can in factwork because uClibc provides the necessary functions.This patch is similar and highly inspired fromhttps://gcc.gnu.org/bugzilla/show_bug.cgi?id=58393, but implemented ina way that doesn't involve changing the configure.ac script, asautoreconfiguring gcc is complicated. It simply relies on the factthat uClibc defines the __UCLIBC__ definition.Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>[Gustavo: update for 4.9.3]Index: b/libstdc++-v3/config/locale/generic/c_locale.h===================================================================--- a/libstdc++-v3/config/locale/generic/c_locale.h+++ b/libstdc++-v3/config/locale/generic/c_locale.h@@ -70,7 +70,7 @@ __builtin_va_list __args; __builtin_va_start(__args, __fmt);-#ifdef _GLIBCXX_USE_C99+#if defined(_GLIBCXX_USE_C99) || defined(__UCLIBC__) const int __ret = __builtin_vsnprintf(__out, __size, __fmt, __args); #else const int __ret = __builtin_vsprintf(__out, __fmt, __args);Index: b/libstdc++-v3/config/locale/gnu/c_locale.h===================================================================--- a/libstdc++-v3/config/locale/gnu/c_locale.h+++ b/libstdc++-v3/config/locale/gnu/c_locale.h@@ -88,7 +88,7 @@ __builtin_va_list __args; __builtin_va_start(__args, __fmt);-#ifdef _GLIBCXX_USE_C99+#if defined(_GLIBCXX_USE_C99) || defined(__UCLIBC__) const int __ret = __builtin_vsnprintf(__out, __size, __fmt, __args); #else const int __ret = __builtin_vsprintf(__out, __fmt, __args);Index: b/libstdc++-v3/include/bits/basic_string.h===================================================================--- a/libstdc++-v3/include/bits/basic_string.h+++ b/libstdc++-v3/include/bits/basic_string.h@@ -2843,7 +2843,7 @@ _GLIBCXX_END_NAMESPACE_VERSION } // namespace-#if __cplusplus >= 201103L && defined(_GLIBCXX_USE_C99)+#if __cplusplus >= 201103L && (defined(_GLIBCXX_USE_C99) || defined(__UCLIBC__)) #include <ext/string_conversions.h>Index: b/libstdc++-v3/include/bits/locale_facets_nonio.tcc===================================================================--- a/libstdc++-v3/include/bits/locale_facets_nonio.tcc+++ b/libstdc++-v3/include/bits/locale_facets_nonio.tcc@@ -572,7 +572,7 @@ { const locale __loc = __io.getloc(); const ctype<_CharT>& __ctype = use_facet<ctype<_CharT> >(__loc);-#ifdef _GLIBCXX_USE_C99+#if defined(_GLIBCXX_USE_C99) || defined(__UCLIBC__) // First try a buffer perhaps big enough. int __cs_size = 64; char* __cs = static_cast<char*>(__builtin_alloca(__cs_size));Index: b/libstdc++-v3/include/bits/locale_facets.tcc===================================================================--- a/libstdc++-v3/include/bits/locale_facets.tcc+++ b/libstdc++-v3/include/bits/locale_facets.tcc@@ -987,7 +987,7 @@ char __fbuf[16]; __num_base::_S_format_float(__io, __fbuf, __mod);-#ifdef _GLIBCXX_USE_C99+#if defined(_GLIBCXX_USE_C99) || defined(__UCLIBC__) // First try a buffer perhaps big enough (most probably sufficient // for non-ios_base::fixed outputs) int __cs_size = __max_digits * 3;Index: b/libstdc++-v3/include/c_compatibility/math.h===================================================================--- a/libstdc++-v3/include/c_compatibility/math.h+++ b/libstdc++-v3/include/c_compatibility/math.h@@ -56,7 +56,7 @@ using std::floor; using std::fmod;-#if _GLIBCXX_USE_C99