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Replace std::__throw_bad_alloc call with standard C++ (#2900)

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* Replace std::__throw_bad_alloc call with standard C++

Since December of 2025, std::__throw_bad_alloc is no longer visible
through #include <new> causing jemalloc build failures with gcc 16.
As far as I can tell, all std::__throw_bad_alloc did was arrange to
raise a std::bad_alloc exception if exceptions are enabled.  I am not
sure whether its usage was truly meaningful in jemalloc since the call
is wrapped in a try catch and any usage of try catch is considered an
error when compiling with -fno-exceptions on gcc, at least.

This change adds a check to configure.ac that determines whether
exceptions are enabled by compiling a simple try catch that raises a
std::bad_alloc exception.  If that test succeeds, the macro
JEMALLOC_HAVE_CXX_EXCEPTIONS is defined, and jemalloc will raise an
exception.  Otherwise, we call std::terminate() to abort.

This was tested on FreeBSD with the gcc16 port with and without exceptions
enabled.

* Replace std::set_new_handler calls with std::get_new_handler

Previously, std::set_new_handler was used as a workaround for
compilers with only partial support for C++11.  Now that C++14 is a
requirement to enable C++ support, we can assume std::get_new_handler
is available.
This commit is contained in:
lexprfuncall
2026-04-27 11:50:27 -07:00
committed by GitHub
parent bb0a6aca10
commit 1a15fe33a4
4 changed files with 43 additions and 14 deletions
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6
Makefile.in
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@@ -337,9 +337,11 @@ TESTS_INTEGRATION += \
endif
ifeq (@enable_cxx@, 1)
CPP_SRCS := $(srcroot)src/jemalloc_cpp.cpp
TESTS_INTEGRATION_CPP := $(srcroot)test/integration/cpp/basic.cpp \
$(srcroot)test/integration/cpp/infallible_new_true.cpp \
TESTS_INTEGRATION_CPP := $(srcroot)test/integration/cpp/basic.cpp
ifeq (@enable_cxx_exceptions@, 1)
TESTS_INTEGRATION_CPP += $(srcroot)test/integration/cpp/infallible_new_true.cpp \
$(srcroot)test/integration/cpp/infallible_new_false.cpp
endif
else
CPP_SRCS :=
TESTS_INTEGRATION_CPP :=