From: Jonathan Wakely <jwakely@redhat.com>
Date: Mon, 10 Aug 2020 11:02:18 +0000 (+0100)
Subject: libstdc++: Check __cpp_exceptions in basic_string::reserve()
X-Git-Tag: basepoints/gcc-12~5626
X-Git-Url: https://gcc.gnu.org/git/?a=commitdiff_plain;h=8bd92d8097d44be01a2bc7e14f7916d151dffcd6;p=gcc.git

libstdc++: Check __cpp_exceptions in basic_string::reserve()

If exceptions are disabled then reallocating could abort, so ignore
shrink-to-fit requests.

libstdc++-v3/ChangeLog:

	* include/bits/basic_string.tcc [_GLIBCXX_USE_CXX11_ABI=0]
	(basic_string::reserve()): Do nothing if exceptions are not
	enabled.
---

diff --git a/libstdc++-v3/include/bits/basic_string.tcc b/libstdc++-v3/include/bits/basic_string.tcc
index a64b63a37fbb..95d2fdbd6d6a 100644
--- a/libstdc++-v3/include/bits/basic_string.tcc
+++ b/libstdc++-v3/include/bits/basic_string.tcc
@@ -1179,6 +1179,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     basic_string<_CharT, _Traits, _Alloc>::
     reserve()
     {
+#if __cpp_exceptions
       if (length() < capacity() || _M_rep()->_M_is_shared())
 	try
 	  {
@@ -1191,6 +1192,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	  { throw; }
 	catch (...)
 	  { /* swallow the exception */ }
+#endif
     }
 
     template<typename _CharT, typename _Traits, typename _Alloc>