gcc/4.9: add patch to enable more C++ features with uClibc
This commit fixes bug #7250, by allowing more libstdc++ features to be enabled with uClibc. libstdc++ wants an absolutely complete C99 support in the C library before enabling *any* feature that needs some C99 functions. However, uClibc doesn't provide C99 complex numbers, so libstdc++ disables a lot of C++ standard methods, even though they are not related to C99 complex numbers. A partial solution already existed in the patch 302-c99-snprintf.patch, but this commit replaces it by the more complete 850-libstdcxx-uclibc-c99.patch, which is highly inspired by https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58393, except that it doesn't rely on configure.ac checks, but simply on testing defined(__UCLIBC__) like was done in 302-c99-snprintf.patch. This allows to avoid having to autoreconf gcc, which is quite complicated to achieve. Reported-by: Richard <tarka.t.otter@gmail.com> Cc: Richard <tarka.t.otter@gmail.com> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
This commit is contained in:
Thomas Petazzoni
Peter Korsgaard
parent
f3d19b047a
commit
452404b7c8
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@ -1,13 +0,0 @@
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Index: gcc-4.8.0/libstdc++-v3/include/c_global/cstdio
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===================================================================
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--- gcc-4.8.0.orig/libstdc++-v3/include/c_global/cstdio 2013-02-03 18:54:05.000000000 +0100
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+++ gcc-4.8.0/libstdc++-v3/include/c_global/cstdio 2013-03-23 17:39:32.000000000 +0100
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@@ -138,7 +138,7 @@
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using ::vsprintf;
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} // namespace
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-#if _GLIBCXX_USE_C99
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+#if _GLIBCXX_USE_C99 || defined __UCLIBC__
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#undef snprintf
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#undef vfscanf
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@ -0,0 +1,273 @@
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Allow C99-depending features of libstdc++ with uClibc
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The libstdc++ code is fairly restrictive on how it checks for C99
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compatibility: it requires *complete* C99 support to enable certain
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features. For example, uClibc provides a good number of C99 features,
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but not C99 complex number support. For this reason, libstdc++
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completely disables many the standard C++ methods that can in fact
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work because uClibc provides the necessary functions.
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This patch is similar and highly inspired from
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58393, but implemented in
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a way that doesn't involve changing the configure.ac script, as
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autoreconfiguring gcc is complicated. It simply relies on the fact
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that uClibc defines the __UCLIBC__ definition.
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Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
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Index: b/libstdc++-v3/config/locale/generic/c_locale.h
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===================================================================
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--- a/libstdc++-v3/config/locale/generic/c_locale.h
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+++ b/libstdc++-v3/config/locale/generic/c_locale.h
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@@ -70,7 +70,7 @@
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__builtin_va_list __args;
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__builtin_va_start(__args, __fmt);
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-#ifdef _GLIBCXX_USE_C99
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+#if defined(_GLIBCXX_USE_C99) || defined(__UCLIBC__)
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const int __ret = __builtin_vsnprintf(__out, __size, __fmt, __args);
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#else
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const int __ret = __builtin_vsprintf(__out, __fmt, __args);
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Index: b/libstdc++-v3/config/locale/gnu/c_locale.h
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===================================================================
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--- a/libstdc++-v3/config/locale/gnu/c_locale.h
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+++ b/libstdc++-v3/config/locale/gnu/c_locale.h
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@@ -88,7 +88,7 @@
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__builtin_va_list __args;
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__builtin_va_start(__args, __fmt);
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-#ifdef _GLIBCXX_USE_C99
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+#if defined(_GLIBCXX_USE_C99) || defined(__UCLIBC__)
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const int __ret = __builtin_vsnprintf(__out, __size, __fmt, __args);
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#else
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const int __ret = __builtin_vsprintf(__out, __fmt, __args);
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Index: b/libstdc++-v3/include/bits/basic_string.h
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===================================================================
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--- a/libstdc++-v3/include/bits/basic_string.h
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+++ b/libstdc++-v3/include/bits/basic_string.h
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@@ -2828,7 +2828,7 @@
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace
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-#if ((__cplusplus >= 201103L) && defined(_GLIBCXX_USE_C99) \
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+#if ((__cplusplus >= 201103L) && (defined(_GLIBCXX_USE_C99) || defined(__UCLIBC__)) \
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&& !defined(_GLIBCXX_HAVE_BROKEN_VSWPRINTF))
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#include <ext/string_conversions.h>
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Index: b/libstdc++-v3/include/bits/locale_facets.tcc
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===================================================================
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--- a/libstdc++-v3/include/bits/locale_facets.tcc
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+++ b/libstdc++-v3/include/bits/locale_facets.tcc
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@@ -987,7 +987,7 @@
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char __fbuf[16];
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__num_base::_S_format_float(__io, __fbuf, __mod);
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-#ifdef _GLIBCXX_USE_C99
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+#if defined(_GLIBCXX_USE_C99) || defined(__UCLIBC__)
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// First try a buffer perhaps big enough (most probably sufficient
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// for non-ios_base::fixed outputs)
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int __cs_size = __max_digits * 3;
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Index: b/libstdc++-v3/include/bits/locale_facets_nonio.tcc
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===================================================================
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--- a/libstdc++-v3/include/bits/locale_facets_nonio.tcc
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+++ b/libstdc++-v3/include/bits/locale_facets_nonio.tcc
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@@ -572,7 +572,7 @@
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{
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const locale __loc = __io.getloc();
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const ctype<_CharT>& __ctype = use_facet<ctype<_CharT> >(__loc);
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-#ifdef _GLIBCXX_USE_C99
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+#if defined(_GLIBCXX_USE_C99) || defined(__UCLIBC__)
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// First try a buffer perhaps big enough.
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int __cs_size = 64;
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char* __cs = static_cast<char*>(__builtin_alloca(__cs_size));
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Index: b/libstdc++-v3/include/c_compatibility/math.h
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===================================================================
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--- a/libstdc++-v3/include/c_compatibility/math.h
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+++ b/libstdc++-v3/include/c_compatibility/math.h
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@@ -56,7 +56,7 @@
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using std::floor;
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using std::fmod;
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-#if _GLIBCXX_USE_C99
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+#if defined(_GLIBCXX_USE_C99) || defined(__UCLIBC__)
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using std::fpclassify;
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using std::isfinite;
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using std::isinf;
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Index: b/libstdc++-v3/include/c_compatibility/wchar.h
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===================================================================
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--- a/libstdc++-v3/include/c_compatibility/wchar.h
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+++ b/libstdc++-v3/include/c_compatibility/wchar.h
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@@ -103,7 +103,7 @@
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using std::wmemset;
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using std::wcsftime;
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-#if _GLIBCXX_USE_C99
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+#if defined(_GLIBCXX_USE_C99) || defined(__UCLIBC__)
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using std::wcstold;
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using std::wcstoll;
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using std::wcstoull;
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Index: b/libstdc++-v3/include/c_global/cstdlib
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===================================================================
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--- a/libstdc++-v3/include/c_global/cstdlib
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+++ b/libstdc++-v3/include/c_global/cstdlib
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@@ -182,7 +182,7 @@
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace
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-#if _GLIBCXX_USE_C99
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+#if defined(_GLIBCXX_USE_C99) || defined(__UCLIBC__)
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#undef _Exit
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#undef llabs
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Index: b/libstdc++-v3/include/c_global/cwchar
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===================================================================
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--- a/libstdc++-v3/include/c_global/cwchar
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+++ b/libstdc++-v3/include/c_global/cwchar
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@@ -232,7 +232,7 @@
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace
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-#if _GLIBCXX_USE_C99
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+#if defined(_GLIBCXX_USE_C99) || defined(__UCLIBC__)
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#undef wcstold
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#undef wcstoll
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@@ -289,7 +289,7 @@
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using std::vwscanf;
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#endif
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-#if _GLIBCXX_USE_C99
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+#if defined(_GLIBCXX_USE_C99) || defined(__UCLIBC__)
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using std::wcstold;
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using std::wcstoll;
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using std::wcstoull;
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Index: b/libstdc++-v3/include/c_std/cstdio
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===================================================================
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--- a/libstdc++-v3/include/c_std/cstdio
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+++ b/libstdc++-v3/include/c_std/cstdio
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@@ -144,7 +144,7 @@
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using ::vsprintf;
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} // namespace std
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-#if _GLIBCXX_USE_C99
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+#if defined(_GLIBCXX_USE_C99) || defined(__UCLIBC__)
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#undef snprintf
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#undef vfscanf
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Index: b/libstdc++-v3/include/c_std/cstdlib
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===================================================================
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--- a/libstdc++-v3/include/c_std/cstdlib
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+++ b/libstdc++-v3/include/c_std/cstdlib
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@@ -180,7 +180,7 @@
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace
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-#if _GLIBCXX_USE_C99
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+#if defined(_GLIBCXX_USE_C99) || defined(__UCLIBC__)
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#undef _Exit
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#undef llabs
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Index: b/libstdc++-v3/include/c_std/cwchar
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===================================================================
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--- a/libstdc++-v3/include/c_std/cwchar
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+++ b/libstdc++-v3/include/c_std/cwchar
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@@ -228,7 +228,7 @@
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace
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-#if _GLIBCXX_USE_C99
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+#if defined(_GLIBCXX_USE_C99) || defined(__UCLIBC__)
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#undef wcstold
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#undef wcstoll
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Index: b/libstdc++-v3/include/ext/vstring.h
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===================================================================
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--- a/libstdc++-v3/include/ext/vstring.h
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+++ b/libstdc++-v3/include/ext/vstring.h
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@@ -2680,7 +2680,7 @@
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace
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-#if ((__cplusplus >= 201103L) && defined(_GLIBCXX_USE_C99))
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+#if ((__cplusplus >= 201103L) && (defined(_GLIBCXX_USE_C99) || defined(__UCLIBC__)))
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#include <ext/string_conversions.h>
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Index: b/libstdc++-v3/include/tr1/cstdio
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===================================================================
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--- a/libstdc++-v3/include/tr1/cstdio
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+++ b/libstdc++-v3/include/tr1/cstdio
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@@ -33,7 +33,7 @@
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#include <cstdio>
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-#if _GLIBCXX_USE_C99
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+#if defined(_GLIBCXX_USE_C99) || defined(__UCLIBC__)
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namespace std _GLIBCXX_VISIBILITY(default)
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{
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Index: b/libstdc++-v3/include/tr1/cstdlib
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===================================================================
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--- a/libstdc++-v3/include/tr1/cstdlib
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+++ b/libstdc++-v3/include/tr1/cstdlib
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@@ -35,7 +35,7 @@
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#if _GLIBCXX_HOSTED
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-#if _GLIBCXX_USE_C99
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+#if defined(_GLIBCXX_USE_C99) || defined(__UCLIBC__)
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namespace std _GLIBCXX_VISIBILITY(default)
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{
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Index: b/libstdc++-v3/include/tr1/cwchar
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===================================================================
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--- a/libstdc++-v3/include/tr1/cwchar
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+++ b/libstdc++-v3/include/tr1/cwchar
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@@ -52,7 +52,7 @@
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using std::vwscanf;
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#endif
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-#if _GLIBCXX_USE_C99
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+#if defined(_GLIBCXX_USE_C99) || defined(__UCLIBC__)
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using std::wcstold;
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using std::wcstoll;
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using std::wcstoull;
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Index: b/libstdc++-v3/include/tr1/stdlib.h
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===================================================================
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--- a/libstdc++-v3/include/tr1/stdlib.h
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+++ b/libstdc++-v3/include/tr1/stdlib.h
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@@ -33,7 +33,7 @@
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#if _GLIBCXX_HOSTED
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-#if _GLIBCXX_USE_C99
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+#if defined(_GLIBCXX_USE_C99) || defined(__UCLIBC__)
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using std::tr1::atoll;
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using std::tr1::strtoll;
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Index: b/libstdc++-v3/src/c++11/debug.cc
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===================================================================
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--- a/libstdc++-v3/src/c++11/debug.cc
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+++ b/libstdc++-v3/src/c++11/debug.cc
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@@ -788,7 +788,7 @@
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int __n __attribute__ ((__unused__)),
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const char* __fmt, _Tp __s) const throw ()
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{
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-#ifdef _GLIBCXX_USE_C99
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+#if defined(_GLIBCXX_USE_C99) || defined(__UCLIBC__)
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std::snprintf(__buf, __n, __fmt, __s);
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#else
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std::sprintf(__buf, __fmt, __s);
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Index: b/libstdc++-v3/include/c_global/cstdio
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===================================================================
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--- a/libstdc++-v3/include/c_global/cstdio
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+++ b/libstdc++-v3/include/c_global/cstdio
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@@ -146,7 +146,7 @@
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using ::vsprintf;
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} // namespace
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-#if _GLIBCXX_USE_C99
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+#if defined(_GLIBCXX_USE_C99) || defined(__UCLIBC__)
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#undef snprintf
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#undef vfscanf
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