Allow C99-depending features of libstdc++ with uClibc The libstdc++ code is fairly restrictive on how it checks for C99 compatibility: it requires *complete* C99 support to enable certain features. 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 fact work because uClibc provides the necessary functions. This patch is similar and highly inspired from https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58393, but implemented in a way that doesn't involve changing the configure.ac script, as autoreconfiguring gcc is complicated. It simply relies on the fact that uClibc defines the __UCLIBC__ definition. Signed-off-by: Thomas Petazzoni [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 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 >(__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(__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 +#if defined(_GLIBCXX_USE_C99) || defined(__UCLIBC__) using std::fpclassify; using std::isfinite; using std::isinf; Index: b/libstdc++-v3/include/c_compatibility/wchar.h =================================================================== --- a/libstdc++-v3/include/c_compatibility/wchar.h +++ b/libstdc++-v3/include/c_compatibility/wchar.h @@ -103,7 +103,7 @@ using std::wmemset; using std::wcsftime; -#if _GLIBCXX_USE_C99 +#if defined(_GLIBCXX_USE_C99) || defined(__UCLIBC__) using std::wcstold; using std::wcstoll; using std::wcstoull; Index: b/libstdc++-v3/include/c_global/cstdio =================================================================== --- a/libstdc++-v3/include/c_global/cstdio +++ b/libstdc++-v3/include/c_global/cstdio @@ -146,7 +146,7 @@ using ::vsprintf; } // namespace -#if _GLIBCXX_USE_C99 +#if defined(_GLIBCXX_USE_C99) || defined(__UCLIBC__) #undef snprintf #undef vfscanf Index: b/libstdc++-v3/include/c_global/cstdlib =================================================================== --- a/libstdc++-v3/include/c_global/cstdlib +++ b/libstdc++-v3/include/c_global/cstdlib @@ -182,7 +182,7 @@ _GLIBCXX_END_NAMESPACE_VERSION } // namespace -#if _GLIBCXX_USE_C99 +#if defined(_GLIBCXX_USE_C99) || defined(__UCLIBC__) #undef _Exit #undef llabs Index: b/libstdc++-v3/include/c_global/cwchar =================================================================== --- a/libstdc++-v3/include/c_global/cwchar +++ b/libstdc++-v3/include/c_global/cwchar @@ -232,7 +232,7 @@ _GLIBCXX_END_NAMESPACE_VERSION } // namespace -#if _GLIBCXX_USE_C99 +#if defined(_GLIBCXX_USE_C99) || defined(__UCLIBC__) #undef wcstold #undef wcstoll @@ -289,7 +289,7 @@ using std::vwscanf; #endif -#if _GLIBCXX_USE_C99 +#if defined(_GLIBCXX_USE_C99) || defined(__UCLIBC__) using std::wcstold; using std::wcstoll; using std::wcstoull; Index: b/libstdc++-v3/include/c_std/cstdio =================================================================== --- a/libstdc++-v3/include/c_std/cstdio +++ b/libstdc++-v3/include/c_std/cstdio @@ -144,7 +144,7 @@ using ::vsprintf; } // namespace std -#if _GLIBCXX_USE_C99 +#if defined(_GLIBCXX_USE_C99) || defined(__UCLIBC__) #undef snprintf #undef vfscanf Index: b/libstdc++-v3/include/c_std/cstdlib =================================================================== --- a/libstdc++-v3/include/c_std/cstdlib +++ b/libstdc++-v3/include/c_std/cstdlib @@ -180,7 +180,7 @@ _GLIBCXX_END_NAMESPACE_VERSION } // namespace -#if _GLIBCXX_USE_C99 +#if defined(_GLIBCXX_USE_C99) || defined(__UCLIBC__) #undef _Exit #undef llabs Index: b/libstdc++-v3/include/c_std/cwchar =================================================================== --- a/libstdc++-v3/include/c_std/cwchar +++ b/libstdc++-v3/include/c_std/cwchar @@ -228,7 +228,7 @@ _GLIBCXX_END_NAMESPACE_VERSION } // namespace -#if _GLIBCXX_USE_C99 +#if defined(_GLIBCXX_USE_C99) || defined(__UCLIBC__) #undef wcstold #undef wcstoll Index: b/libstdc++-v3/include/ext/vstring.h =================================================================== --- a/libstdc++-v3/include/ext/vstring.h +++ b/libstdc++-v3/include/ext/vstring.h @@ -2680,7 +2680,7 @@ _GLIBCXX_END_NAMESPACE_VERSION } // namespace -#if ((__cplusplus >= 201103L) && defined(_GLIBCXX_USE_C99)) +#if ((__cplusplus >= 201103L) && (defined(_GLIBCXX_USE_C99) || defined(__UCLIBC__))) #include Index: b/libstdc++-v3/include/tr1/cstdio =================================================================== --- a/libstdc++-v3/include/tr1/cstdio +++ b/libstdc++-v3/include/tr1/cstdio @@ -33,7 +33,7 @@ #include -#if _GLIBCXX_USE_C99 +#if defined(_GLIBCXX_USE_C99) || defined(__UCLIBC__) namespace std _GLIBCXX_VISIBILITY(default) { Index: b/libstdc++-v3/include/tr1/cstdlib =================================================================== --- a/libstdc++-v3/include/tr1/cstdlib +++ b/libstdc++-v3/include/tr1/cstdlib @@ -35,7 +35,7 @@ #if _GLIBCXX_HOSTED -#if _GLIBCXX_USE_C99 +#if defined(_GLIBCXX_USE_C99) || defined(__UCLIBC__) namespace std _GLIBCXX_VISIBILITY(default) { Index: b/libstdc++-v3/include/tr1/cwchar =================================================================== --- a/libstdc++-v3/include/tr1/cwchar +++ b/libstdc++-v3/include/tr1/cwchar @@ -52,7 +52,7 @@ using std::vwscanf; #endif -#if _GLIBCXX_USE_C99 +#if defined(_GLIBCXX_USE_C99) || defined(__UCLIBC__) using std::wcstold; using std::wcstoll; using std::wcstoull; Index: b/libstdc++-v3/include/tr1/stdlib.h =================================================================== --- a/libstdc++-v3/include/tr1/stdlib.h +++ b/libstdc++-v3/include/tr1/stdlib.h @@ -33,7 +33,7 @@ #if _GLIBCXX_HOSTED -#if _GLIBCXX_USE_C99 +#if defined(_GLIBCXX_USE_C99) || defined(__UCLIBC__) using std::tr1::atoll; using std::tr1::strtoll; Index: b/libstdc++-v3/src/c++11/debug.cc =================================================================== --- a/libstdc++-v3/src/c++11/debug.cc +++ b/libstdc++-v3/src/c++11/debug.cc @@ -788,7 +788,7 @@ int __n __attribute__ ((__unused__)), const char* __fmt, _Tp __s) const throw () { -#ifdef _GLIBCXX_USE_C99 +#if defined(_GLIBCXX_USE_C99) || defined(__UCLIBC__) std::snprintf(__buf, __n, __fmt, __s); #else std::sprintf(__buf, __fmt, __s);