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don't build with -fno-exceptions

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It looks like, in past it could produce better code. But since
unwinding is totally different since almost forever now, there is no
perfomance benefit of it anymore.
This commit is contained in:
Aliaksey Kandratsenka 2017-02-12 17:12:44 -08:00
parent d6a1931cce
commit 6d98223a90
1 changed files with 2 additions and 24 deletions
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26
Makefile.am
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@ -56,17 +56,6 @@ endif HAVE_SIZED_DEALLOCATION
# Cygwin and MinGW. LIBSTDCXX_LA_LINKER_FLAG is used to fix a Solaris bug.
AM_LDFLAGS = -no-undefined $(LIBSTDCXX_LA_LINKER_FLAG)
# We know our low-level code cannot trigger an exception. On some
# systems, such as cygwin, it would be disastrous if they did, because
# the exception handler might call malloc! If our low-level routines
# raised an exception within the malloc, they'd deadlock. Luckily,
# we control all this code, and do not need exceptions for it.
if GCC
NO_EXCEPTIONS = -fno-exceptions
else !GCC
NO_EXCEPTIONS =
endif !GCC
# These are x86-specific, having to do with frame-pointers. In
# particular, some x86_64 systems do not insert frame pointers by
# default (all i386 systems that I know of, do. I don't know about
@ -464,10 +453,6 @@ perftoolsinclude_HEADERS += $(SG_TCMALLOC_MINIMAL_INCLUDES)
### Making the library
# As we describe at the top of this file, we want to turn off exceptions
# for all files in this library -- except tcmalloc.cc which needs them
# to fulfill its API. Automake doesn't allow per-file CXXFLAGS, so we need
# to separate into two libraries.
noinst_LTLIBRARIES += libtcmalloc_minimal_internal.la
libtcmalloc_minimal_internal_la_SOURCES = src/common.cc \
src/internal_logging.cc \
@ -488,7 +473,7 @@ libtcmalloc_minimal_internal_la_SOURCES = src/common.cc \
libtcmalloc_minimal_internal_la_CXXFLAGS = -DNO_TCMALLOC_SAMPLES \
-DNO_HEAP_CHECK \
-DNDEBUG \
$(AM_CXXFLAGS) $(NO_EXCEPTIONS)
$(AM_CXXFLAGS)
libtcmalloc_minimal_internal_la_LDFLAGS = $(AM_LDFLAGS)
libtcmalloc_minimal_internal_la_LIBADD = $(LIBSPINLOCK) libmaybe_threads.la
@ -797,9 +782,6 @@ dist_doc_DATA += docs/overview.dot \
### ------- tcmalloc_minimal_debug (thread-caching malloc with debugallocation)
# Like tcmalloc.cc, debugallocation.cc needs exceptions to fulfill its
# API. Luckily, we can reuse everything else from tcmalloc_minimal.
if WITH_DEBUGALLOC
lib_LTLIBRARIES += libtcmalloc_minimal_debug.la
@ -942,10 +924,6 @@ endif !BUILD_EMERGENCY_MALLOC
### Making the library
# As we describe at the top of this file, we want to turn off exceptions
# for all files in this library -- except tcmalloc.cc which needs them
# to fulfill its API. Automake doesn't allow per-file CXXFLAGS, so we need
# to separate into two libraries.
noinst_LTLIBRARIES += libtcmalloc_internal.la
libtcmalloc_internal_la_SOURCES = $(libtcmalloc_minimal_internal_la_SOURCES) \
$(TCMALLOC_INCLUDES) \
@ -956,7 +934,7 @@ libtcmalloc_internal_la_SOURCES = $(libtcmalloc_minimal_internal_la_SOURCES) \
$(EMERGENCY_MALLOC_CC) \
src/memory_region_map.cc
libtcmalloc_internal_la_CXXFLAGS = $(PTHREAD_CFLAGS) -DNDEBUG \
$(AM_CXXFLAGS) $(NO_EXCEPTIONS) $(EMERGENCY_MALLOC_DEFINE)
$(AM_CXXFLAGS) $(EMERGENCY_MALLOC_DEFINE)
libtcmalloc_internal_la_LDFLAGS = $(PTHREAD_CFLAGS)
libtcmalloc_internal_la_LIBADD = libstacktrace.la $(PTHREAD_LIBS)