059b5509c1
For both GCN, nvptx, this gets rid of 'configure'-time:
configure: WARNING: No native atomic operations are provided for this platform.
configure: WARNING: They will be faked using a mutex.
configure: WARNING: Performance of certain classes will degrade as a result.
..., and changes:
-checking for lock policy for shared_ptr reference counts... mutex
+checking for lock policy for shared_ptr reference counts... atomic
That means, '[...]/[target]/libstdc++-v3/', 'Makefile's change:
-ATOMICITY_SRCDIR = config/cpu/generic/atomicity_mutex
+ATOMICITY_SRCDIR = config/cpu/generic/atomicity_builtins
..., and '[...]/[target]/libstdc++-v3/config.h' changes:
/* Defined if shared_ptr reference counting should use atomic operations. */
-/* #undef HAVE_ATOMIC_LOCK_POLICY */
+#define HAVE_ATOMIC_LOCK_POLICY 1
/* Define if the compiler supports C++11 atomics. */
-/* #undef _GLIBCXX_ATOMIC_BUILTINS */
+#define _GLIBCXX_ATOMIC_BUILTINS 1
..., and '[...]/[target]/libstdc++-v3/include/[target]/bits/c++config.h'
changes:
/* Defined if shared_ptr reference counting should use atomic operations. */
-/* #undef _GLIBCXX_HAVE_ATOMIC_LOCK_POLICY */
+#define _GLIBCXX_HAVE_ATOMIC_LOCK_POLICY 1
/* Define if the compiler supports C++11 atomics. */
-/* #undef _GLIBCXX_ATOMIC_BUILTINS */
+#define _GLIBCXX_ATOMIC_BUILTINS 1
This means that '[...]/[target]/libstdc++-v3/libsupc++/atomicity.cc',
'[...]/[target]/libstdc++-v3/libsupc++/atomicity.o' then uses atomic
instructions for synchronization instead of C++ static local variables, which
in turn for their guard variables, via 'libstdc++-v3/libsupc++/guard.cc', used
'libgcc/gthr.h' recursive mutexes, which currently are unsupported for GCN.
For GCN, this turns ~500 libstdc++ execution test FAILs into PASSes, and also
progresses:
PASS: g++.dg/tree-ssa/pr20458.C -std=gnu++17 (test for excess errors)
[-FAIL:-]{+PASS:+} g++.dg/tree-ssa/pr20458.C -std=gnu++17 execution test
PASS: g++.dg/tree-ssa/pr20458.C -std=gnu++26 (test for excess errors)
[-FAIL:-]{+PASS:+} g++.dg/tree-ssa/pr20458.C -std=gnu++26 execution test
UNSUPPORTED: g++.dg/tree-ssa/pr20458.C -std=gnu++98: exception handling not supported
(For nvptx, there is no effective change, due to other misconfiguration.)
PR target/119645
libstdc++-v3/
* acinclude.m4 (GLIBCXX_ENABLE_LOCK_POLICY) [GCN, nvptx]:
Hard-code results.
* configure: Regenerate.
* configure.host [GCN, nvptx] (atomicity_dir): Set to
'cpu/generic/atomicity_builtins'.
431 lines
12 KiB
Text
431 lines
12 KiB
Text
# configure.host
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#
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# This shell script handles all host based configuration for libstdc++.
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# It sets various shell variables based on the host and the
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# configuration options. You can modify this shell script without needing
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# to rerun autoconf/aclocal/etc. This file is "sourced" not executed.
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#
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# You should read docs/html/17_intro/porting.* to make sense of this file.
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#
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#
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# It uses the following shell variables as set by config.guess:
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# host The configuration host (full CPU-vendor-OS triplet)
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# host_cpu The configuration host CPU
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# host_os The configuration host OS
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#
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#
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# It sets the following shell variables:
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#
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# cpu_include_dir CPU-specific directory, defaults to cpu/generic
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# if cpu/host_cpu doesn't exist. This is not used
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# directly, but sets the default for others.
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#
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# os_include_dir OS-specific directory, defaults to os/generic.
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#
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# c_model the "C" header model, defaults to c_global.
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#
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# c_compatibility if "C" compatibility headers are necessary,
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# defaults to no.
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#
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# abi_baseline_pair directory name for ABI compat testing,
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# defaults to host_cpu-host_os (as per config.guess)
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#
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# abi_baseline_subdir_switch
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# g++ switch to determine ABI baseline subdir for
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# multilibbed targets,
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# defaults to --print-multi-directory
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#
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# abi_tweaks_dir location of cxxabi_tweaks.h,
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# defaults to cpu_include_dir
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#
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# atomicity_dir location of atomicity.h,
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# defaults to cpu_include_dir
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#
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# atomic_word_dir location of atomic_word.h
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# defaults to generic.
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#
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# atomic_flags extra flags to pass to use atomic instructions
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# defaults to nothing.
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#
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# cpu_defines_dir location of cpu_defines.h
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# defaults to generic.
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#
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# cpu_opt_bits_random path name of random.h containing CPU-specific
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# optimizations
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#
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# cpu_opt_ext_random path name of random.h containing CPU-specific
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# optimizations for extensions
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#
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# error_constants_dir location of error_constants.h
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# defaults to os/generic.
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#
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# It possibly modifies the following variables:
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#
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# EXTRA_CFLAGS extra flags to pass when compiling C code
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#
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# EXTRA_CXX_FLAGS extra flags to pass when compiling C++ code
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#
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# OPT_LDFLAGS extra flags to pass when linking the library, of
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# the form '-Wl,blah'
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# (defaults to empty in acinclude.m4)
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#
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# port_specific_symbol_files
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# whitespace-separated list of files containing
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# additional symbols to export from the shared
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# library, when symbol versioning is in use
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#
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# tmake_file A list of machine-description-specific
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# makefile fragments.
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#
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#
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# If the defaults will not work for your platform, you need only change the
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# variables that won't work, i.e., you do not need to explicitly set a
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# working variable to its default. Most hosts only need to change the two
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# *_include_dir variables.
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# DEFAULTS
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# Try to guess a default cpu_include_dir based on the name of the CPU. We
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# cannot do this for os_include_dir; there are too many portable operating
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# systems out there. :-)
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c_model=c_global
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c_compatibility=no
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atomic_word_dir=cpu/generic
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atomic_flags=""
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atomicity_dir="cpu/generic"
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cpu_defines_dir="cpu/generic"
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try_cpu=generic
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abi_baseline_subdir_switch=--print-multi-directory
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abi_tweaks_dir="cpu/generic"
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error_constants_dir="os/generic"
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tmake_file=
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# HOST-SPECIFIC OVERRIDES
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# Set any CPU-dependent bits.
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# Provide a way to funnel exotic flavors and prefixed/postfixed chip
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# variants into the established source config/cpu/* sub-directories.
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# THIS TABLE IS SORTED. KEEP IT THAT WAY.
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case "${host_cpu}" in
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alpha*)
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try_cpu=alpha
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;;
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arm*)
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try_cpu=arm
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;;
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crisv32)
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try_cpu=cris
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;;
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i[567]86 | x86_64)
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try_cpu=i486
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;;
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hppa*)
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try_cpu=hppa
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;;
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mips*)
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try_cpu=mips
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;;
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powerpc* | rs6000)
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try_cpu=powerpc
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;;
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sparc* | ultrasparc)
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try_cpu=sparc
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;;
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*)
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if test -d ${glibcxx_srcdir}/config/cpu/${host_cpu}; then
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try_cpu=${host_cpu}
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fi
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esac
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# Now look for the file(s) usually tied to a CPU model, and make
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# default choices for those if they haven't been explicitly set
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# already.
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cpu_include_dir=cpu/${try_cpu}
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# Set specific CPU overrides for cpu_defines_dir. Most can just use generic.
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# THIS TABLE IS SORTED. KEEP IT THAT WAY.
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case "${host_cpu}" in
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amdgcn)
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cpu_defines_dir=cpu/gcn
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;;
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arm*)
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cpu_defines_dir=cpu/arm
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;;
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nvptx)
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cpu_defines_dir=cpu/nvptx
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;;
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powerpc* | rs6000)
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cpu_defines_dir=cpu/powerpc
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;;
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esac
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# Set specific CPU overrides for atomic_word_dir and atomic_flags.
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# Most can just use generic.
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# THIS TABLE IS SORTED. KEEP IT THAT WAY.
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case "${host_cpu}" in
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cris*)
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atomic_word_dir=cpu/cris
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;;
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i[4567]86 | x86_64)
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atomic_flags="-march=native"
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;;
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sparc* | ultrasparc)
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atomic_word_dir=cpu/sparc
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atomic_flags="-mcpu=v9"
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;;
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esac
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# Set specific CPU overrides for atomicity_dir.
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# This can be over-ridden in GLIBCXX_ENABLE_ATOMIC_BUILTINS.
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# THIS TABLE IS SORTED. KEEP IT THAT WAY.
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if test -f ${glibcxx_srcdir}/config/${cpu_include_dir}/atomicity.h ; then
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atomicity_dir=$cpu_include_dir
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fi
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if test -f ${glibcxx_srcdir}/config/${cpu_include_dir}/cxxabi_tweaks.h ; then
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abi_tweaks_dir=$cpu_include_dir
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fi
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# Set directory with CPU-specific optimization
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cpu_opt_dir=${cpu_include_dir}/opt
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test -d ${glibcxx_srcdir}/config/${cpu_include_dir}/opt ||
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cpu_opt_dir=cpu/generic/opt
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# For each header with CPU-specific optimizations check whether it
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# exists in ${cpu_opt_dir}. If not, point the variable at the
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# appropriate file in the generic directory.
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cpu_opt_ext_random=${cpu_opt_dir}/ext/opt_random.h
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test -f ${glibcxx_srcdir}/config/${cpu_opt_ext_random} ||
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cpu_opt_ext_random=cpu/generic/opt/ext/opt_random.h
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cpu_opt_bits_random=${cpu_opt_dir}/bits/opt_random.h
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test -f ${glibcxx_srcdir}/config/${cpu_opt_ext_random} ||
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cpu_opt_ext_random=cpu/generic/opt/bits/opt_random.h
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# Set any OS-dependent bits.
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# Set the os_include_dir.
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# Set the error_costants_dir.
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# Set c_model, c_compatibility here.
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# If atomic ops and/or numeric limits are OS-specific rather than
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# CPU-specifc, set those here too.
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# THIS TABLE IS SORTED. KEEP IT THAT WAY.
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case "${host_os}" in
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aix[56789]*)
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# Newer versions of AIX only support PowerPC architecture, so use
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# atomic instructions directly.
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os_include_dir="os/aix"
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tmake_file="os/aix/t-aix"
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;;
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aix*)
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os_include_dir="os/generic"
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atomicity_dir="cpu/generic"
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;;
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bsd*)
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# Plain BSD attempts to share FreeBSD files.
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os_include_dir="os/bsd/freebsd"
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;;
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cygwin*)
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os_include_dir="os/newlib"
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OPT_LDFLAGS="${OPT_LDFLAGS} \$(lt_host_flags)"
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;;
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darwin[4-7] | darwin[4-7].*)
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# For earlier Darwin, performance is improved if libstdc++ is
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# single-module. Up to at least 10.3.7, -flat_namespace is required
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# for proper treatment of coalesced symbols.
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OPT_LDFLAGS="${OPT_LDFLAGS} -Wl,-single_module -Wl,-flat_namespace"
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os_include_dir="os/bsd/darwin"
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;;
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darwin8 | darwin8.* )
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# For 8+ compatibility is better if not -flat_namespace.
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OPT_LDFLAGS="${OPT_LDFLAGS} -Wl,-single_module"
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case "${host_cpu}" in
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i[34567]86 | x86_64)
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OPTIMIZE_CXXFLAGS="${OPTIMIZE_CXXFLAGS} -fvisibility-inlines-hidden"
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;;
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esac
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os_include_dir="os/bsd/darwin"
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;;
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darwin*)
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# Post Darwin8, defaults should be sufficient.
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os_include_dir="os/bsd/darwin"
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;;
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*djgpp*) # leading * picks up "msdosdjgpp"
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os_include_dir="os/djgpp"
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error_constants_dir="os/djgpp"
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;;
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dragonfly*)
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os_include_dir="os/bsd/dragonfly"
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;;
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freebsd*)
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os_include_dir="os/bsd/freebsd"
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;;
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linux-musl*)
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os_include_dir="os/generic"
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;;
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gnu* | linux* | kfreebsd*-gnu | uclinux*)
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if [ "$uclibc" = "yes" ]; then
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os_include_dir="os/uclibc"
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elif [ "$bionic" = "yes" ]; then
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os_include_dir="os/bionic"
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else
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os_include_dir="os/gnu-linux"
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fi
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;;
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hpux*)
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os_include_dir="os/hpux"
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;;
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mingw32*)
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case "$host" in
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*-w64-*)
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os_include_dir="os/mingw32-w64"
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error_constants_dir="os/mingw32-w64"
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;;
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*)
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os_include_dir="os/mingw32"
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error_constants_dir="os/mingw32"
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;;
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esac
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OPT_LDFLAGS="${OPT_LDFLAGS} \$(lt_host_flags)"
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;;
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netbsd*)
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os_include_dir="os/bsd/netbsd"
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;;
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openbsd*)
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os_include_dir="os/bsd/openbsd"
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;;
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qnx6.[12]*)
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os_include_dir="os/qnx/qnx6.1"
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c_model=c
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;;
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rtems*)
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# Use libatomic if necessary and avoid libstdc++ specific atomicity support
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atomicity_dir="cpu/generic/atomicity_builtins"
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;;
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solaris2*)
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os_include_dir="os/solaris"
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;;
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tpf)
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os_include_dir="os/tpf"
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;;
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vxworks*)
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os_include_dir="os/vxworks"
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;;
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*)
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os_include_dir="os/generic"
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;;
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esac
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# Set any OS-dependent and CPU-dependent bits.
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# THIS TABLE IS SORTED. KEEP IT THAT WAY.
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case "${host}" in
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loongarch*)
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tmake_file="cpu/loongarch/t-loongarch"
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;;
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*-*-linux* | *-*-uclinux*)
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case "${host_cpu}" in
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i[567]86)
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abi_baseline_pair=i486-linux-gnu
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;;
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mips64*)
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abi_baseline_pair=mips64-linux-gnu
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;;
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powerpc64le*)
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abi_baseline_pair=powerpc64le-linux-gnu
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;;
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powerpc64*)
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abi_baseline_pair=powerpc64-linux-gnu
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;;
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s390)
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abi_baseline_pair=s390-linux-gnu
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;;
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s390x)
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abi_baseline_pair=s390x-linux-gnu
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;;
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sparc64)
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abi_baseline_pair=sparc64-linux-gnu
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;;
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x86_64)
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abi_baseline_pair=x86_64-linux-gnu
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;;
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*)
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if test $try_cpu = generic; then
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try_abi_cpu=$host_cpu
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else
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try_abi_cpu=$try_cpu
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fi
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if test -d ${glibcxx_srcdir}/config/abi/post/${try_abi_cpu}-linux-gnu; then
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abi_baseline_pair=${try_abi_cpu}-linux-gnu
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fi
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esac
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case "${host}" in
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arm*-*-linux-* | arm*-*-uclinuxfdpiceabi)
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port_specific_symbol_files="\$(srcdir)/../config/os/gnu-linux/arm-eabi-extra.ver"
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;;
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esac
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;;
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amdgcn-*-amdhsa)
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# To avoid greater pain elsewhere, force use of '__atomic' builtins,
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# regardless of the outcome of 'configure' checks; see PR119645
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# "GCN, nvptx: libstdc++ 'checking for atomic builtins [...]... no'".
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atomicity_dir=cpu/generic/atomicity_builtins
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;;
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arm*-*-freebsd*)
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port_specific_symbol_files="\$(srcdir)/../config/os/gnu-linux/arm-eabi-extra.ver"
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;;
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nvptx-*-none)
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# To avoid greater pain elsewhere, force use of '__atomic' builtins,
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# regardless of the outcome of 'configure' checks; see PR119645
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# "GCN, nvptx: libstdc++ 'checking for atomic builtins [...]... no'".
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atomicity_dir=cpu/generic/atomicity_builtins
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# For 'make all-target-libstdc++-v3', re 'alloca'/VLA usage:
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EXTRA_CFLAGS="${EXTRA_CFLAGS} -mfake-ptx-alloca"
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OPTIMIZE_CXXFLAGS="${OPTIMIZE_CXXFLAGS} -mfake-ptx-alloca"
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;;
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powerpc*-*-darwin*)
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port_specific_symbol_files="\$(srcdir)/../config/os/bsd/darwin/ppc-extra.ver"
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;;
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*-*-solaris2*)
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abi_baseline_pair=solaris
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case "${host_cpu}" in
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i?86 | x86_64)
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abi_baseline_pair=i386-${abi_baseline_pair}
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;;
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sparc*)
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abi_baseline_pair=sparc-${abi_baseline_pair}
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;;
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esac
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abi_baseline_subdir_switch=--print-multi-os-directory
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;;
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esac
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# Dumb down libstdc++ for certain configurations.
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# THIS TABLE IS SORTED. KEEP IT THAT WAY.
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case "${host}" in
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amdgcn-*-amdhsa \
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| nvptx-*-none )
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# For 'make all-target-libstdc++-v3' and 'make check-target-libstdc++-v3',
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# exception handling is not supported: in case that exception handling
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# constructs survive compiler optimizations, the back ends error out:
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# sorry, unimplemented: exception handling not supported
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EXTRA_CXX_FLAGS="${EXTRA_CXX_FLAGS} -fno-exceptions"
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# For 'make all-target-libstdc++-v3' and 'make check-target-libstdc++-v3',
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# RTTI is not supported.
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EXTRA_CXX_FLAGS="${EXTRA_CXX_FLAGS} -fno-rtti"
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# Cannot '#include' all newlib header files without explosion, for example:
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# error: 'jmp_buf' was not declared in this scope
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# Just disable generation of PCH files here, instead of attempting to care
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# for such special cases in some more complex way.
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enable_libstdcxx_pch=no
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;;
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esac
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