This flag was used when building 32-bit Windows executables, which we no-longer
do, and is not accepted by the linker for any of the hosts we currently build
for. i.e:
```bash
checking whether the linker accepts -Wl,--large-address-aware... no
```
--large-address-aware
If given, the appropriate bit in the "Characteristics" field of the COFF
header is set to indicate that this executable supports virtual addresses
greater than 2 gigabytes. This should be used in conjunction with the /3GB
or /USERVA=value megabytes switch in the "[operating systems]" section of
the BOOT .INI. Otherwise, this bit has no effect. [This option is specific
to PE targeted ports of the linker]
You can check that the appropriate bit in the COFF header of our current
Windows binaries is still be set using dumpbin. i.e:
```powershell
dumpbin /headers .\bitcoind.exe
FILE HEADER VALUES
<snip>
26 characteristics
Executable
Line numbers stripped
Application can handle large (>2GB) addresses
```
f7453dcc0386a4a1162ced1a490c096afa13178a build: remove linking librt for backwards compatibility (fanquake)
Pull request description:
Now that we require glibc 2.17+, see #17538, we can remove linking librt
for backwards compatibility purposes. The `clock_*` functions from librt
were merged into glibc as part of the [2.17 release](https://sourceware.org/ml/libc-announce/2012/msg00001.html):
* The `clock_*` suite of functions (declared in <time.h>) is now available
directly in the main C library. Previously it was necessary to link with
-lrt to use these functions. This change has the effect that a
single-threaded program that uses a function such as `clock_gettime' (and
is not linked with -lrt) will no longer implicitly load the pthreads
library at runtime and so will not suffer the overheads associated with
multi-thread support in other code such as the C++ runtime library.
Note that `librt` is already unused by the RISC-V and AARCH64 binaries as their librts don't export any `clock_*` functions. As an example, you can find a diff of the arm32 vs arm64 librt symbols [here](https://gist.github.com/fanquake/b08cb1f0d14df3133395d7796ebf030c).
Below is the library usage for the `v0.19.0.1` release (can delete these tables pre-merge).
#### RISC-V
```bash
riscv/bin/bitcoin-cli: ['libpthread.so.0', 'libm.so.6', 'libgcc_s.so.1', 'libc.so.6', 'ld-linux-riscv64-lp64d.so.1']
riscv/bin/bitcoin-qt: ['libpthread.so.0', 'libfontconfig.so.1', 'libfreetype.so.6', 'libxcb.so.1', 'libdl.so.2', 'libm.so.6', 'libgcc_s.so.1', 'libc.so.6', 'ld-linux-riscv64-lp64d.so.1', 'libatomic.so.1']
riscv/bin/bitcoin-wallet: ['libpthread.so.0', 'libm.so.6', 'libgcc_s.so.1', 'libc.so.6', 'ld-linux-riscv64-lp64d.so.1', 'libatomic.so.1']
riscv/bin/bitcoind: ['libpthread.so.0', 'libm.so.6', 'libgcc_s.so.1', 'libc.so.6', 'ld-linux-riscv64-lp64d.so.1', 'libatomic.so.1']
riscv/bin/bitcoin-tx: ['libpthread.so.0', 'libm.so.6', 'libgcc_s.so.1', 'libc.so.6', 'ld-linux-riscv64-lp64d.so.1']
riscv/bin/test_bitcoin: ['libpthread.so.0', 'libm.so.6', 'libgcc_s.so.1', 'libc.so.6', 'ld-linux-riscv64-lp64d.so.1', 'libatomic.so.1']
```
#### AARCH64
```bash
aarch64/bin/bitcoin-cli: ['libpthread.so.0', 'libm.so.6', 'libgcc_s.so.1', 'libc.so.6', 'ld-linux-aarch64.so.1']
aarch64/bin/bitcoin-qt: ['libpthread.so.0', 'libfontconfig.so.1', 'libfreetype.so.6', 'libxcb.so.1', 'libdl.so.2', 'libm.so.6', 'libgcc_s.so.1', 'libc.so.6', 'ld-linux-aarch64.so.1']
aarch64/bin/bitcoin-wallet: ['libpthread.so.0', 'libm.so.6', 'libgcc_s.so.1', 'libc.so.6', 'ld-linux-aarch64.so.1']
aarch64/bin/bitcoind: ['libpthread.so.0', 'libm.so.6', 'libgcc_s.so.1', 'libc.so.6', 'ld-linux-aarch64.so.1']
aarch64/bin/bitcoin-tx: ['libpthread.so.0', 'libm.so.6', 'libgcc_s.so.1', 'libc.so.6', 'ld-linux-aarch64.so.1']
aarch64/bin/test_bitcoin: ['libpthread.so.0', 'libm.so.6', 'libgcc_s.so.1', 'libc.so.6', 'ld-linux-aarch64.so.1']
```
#### ARM LINUX GNUEABIHF
```bash
arm32/bin/bitcoin-cli: ['libpthread.so.0', 'librt.so.1', 'libm.so.6', 'libgcc_s.so.1', 'libc.so.6', 'ld-linux-armhf.so.3']
arm32/bin/bitcoin-qt: ['libpthread.so.0', 'librt.so.1', 'libfontconfig.so.1', 'libfreetype.so.6', 'libxcb.so.1', 'libdl.so.2', 'libm.so.6', 'libgcc_s.so.1', 'libc.so.6', 'ld-linux-armhf.so.3']
arm32/bin/bitcoin-wallet: ['libpthread.so.0', 'librt.so.1', 'libm.so.6', 'libgcc_s.so.1', 'libc.so.6', 'ld-linux-armhf.so.3']
arm32/bin/bitcoind: ['libpthread.so.0', 'librt.so.1', 'libm.so.6', 'libgcc_s.so.1', 'libc.so.6', 'ld-linux-armhf.so.3']
arm32/bin/bitcoin-tx: ['libpthread.so.0', 'librt.so.1', 'libm.so.6', 'libgcc_s.so.1', 'libc.so.6', 'ld-linux-armhf.so.3']
arm32/bin/test_bitcoin: ['libpthread.so.0', 'librt.so.1', 'libm.so.6', 'libgcc_s.so.1', 'libc.so.6', 'ld-linux-armhf.so.3']
```
#### LINUX X86_64
```bash
x86_64/bin/bitcoin-cli: ['libpthread.so.0', 'librt.so.1', 'libm.so.6', 'libgcc_s.so.1', 'libc.so.6', 'ld-linux-x86-64.so.2']
x86_64/bin/bitcoin-qt: ['libpthread.so.0', 'librt.so.1', 'libfontconfig.so.1', 'libfreetype.so.6', 'libxcb.so.1', 'libdl.so.2', 'libm.so.6', 'libgcc_s.so.1', 'libc.so.6', 'ld-linux-x86-64.so.2']
x86_64/bin/bitcoin-wallet: ['libpthread.so.0', 'librt.so.1', 'libm.so.6', 'libgcc_s.so.1', 'libc.so.6', 'ld-linux-x86-64.so.2']
x86_64/bin/bitcoind: ['libpthread.so.0', 'librt.so.1', 'libm.so.6', 'libgcc_s.so.1', 'libc.so.6', 'ld-linux-x86-64.so.2']
x86_64/bin/bitcoin-tx: ['libpthread.so.0', 'librt.so.1', 'libm.so.6', 'libgcc_s.so.1', 'libc.so.6', 'ld-linux-x86-64.so.2']
x86_64/bin/test_bitcoin: ['libpthread.so.0', 'librt.so.1', 'libm.so.6', 'libgcc_s.so.1', 'libc.so.6', 'ld-linux-x86-64.so.2']
```
#### LINUX i686
```bash
i686/bin/bitcoin-cli: ['libpthread.so.0', 'librt.so.1', 'libm.so.6', 'libgcc_s.so.1', 'libc.so.6', 'ld-linux.so.2']
i686/bin/bitcoin-qt: ['libpthread.so.0', 'librt.so.1', 'libfontconfig.so.1', 'libfreetype.so.6', 'libxcb.so.1', 'libdl.so.2', 'libm.so.6', 'libgcc_s.so.1', 'libc.so.6', 'ld-linux.so.2']
i686/bin/bitcoin-wallet: ['libpthread.so.0', 'librt.so.1', 'libm.so.6', 'libgcc_s.so.1', 'libc.so.6', 'ld-linux.so.2']
i686/bin/bitcoind: ['libpthread.so.0', 'librt.so.1', 'libm.so.6', 'libgcc_s.so.1', 'libc.so.6', 'ld-linux.so.2']
i686/bin/bitcoin-tx: ['libpthread.so.0', 'librt.so.1', 'libm.so.6', 'libgcc_s.so.1', 'libc.so.6', 'ld-linux.so.2']
i686/bin/test_bitcoin: ['libpthread.so.0', 'librt.so.1', 'libm.so.6', 'libgcc_s.so.1', 'libc.so.6', 'ld-linux.so.2']
```
ACKs for top commit:
laanwj:
ACK f7453dcc0386a4a1162ced1a490c096afa13178a
Tree-SHA512: b418260edcda88583abfa386a592ebfb977d111e8e2ba887a30bf830b0b10dba429b9cfd615fad453ff0bb824225914ccb91433064b158ae1fbb9d20fc0b9937
Now that we require glibc 2.17+, #17538, we can remove linking in librt
for backwards compatibility purposes. The clock_* functions from librt
were merged into glibc as part of the 2.17 release.
* The `clock_*' suite of functions (declared in <time.h>) is now available
directly in the main C library. Previously it was necessary to link with
-lrt to use these functions. This change has the effect that a
single-threaded program that uses a function such as `clock_gettime' (and
is not linked with -lrt) will no longer implicitly load the pthreads
library at runtime and so will not suffer the overheads associated with
multi-thread support in other code such as the C++ runtime library.
https://sourceware.org/ml/libc-announce/2012/msg00001.html
Note that librt is already not linked by the RISC-V and AARCH64 binaries.
c78b123982d59fe2d633659f23d6893de627f3f6 build: add -bind_at_load to hardened LDFLAGS (fanquake)
Pull request description:
This performs the same function as `-Wl,-z,now`, except for ld on macOS.
You can check the binaries using `otool -l`, and looking for the `LC_DYLD_INFO_ONLY` section; `lazy_bind_off` and `lazy_bind_size` should both be 0.
This seems to be the case with our current release binaries. However we can make the check, and applying the flag explicit in configure.
man ld:
```bash
-bind_at_load
Sets a bit in the mach header of the resulting binary which tells dyld
to bind all symbols when the binary is loaded, rather than lazily.
```
TODO:
- [ ] Follow up with `MH_BINDATLOAD` flag.
ACKs for top commit:
theuni:
ACK c78b123982d59fe2d633659f23d6893de627f3f6.
Tree-SHA512: 12259558b84f7e3d75d6fcde63b517685e42b18fcf8e8cfcf347483c5ba089d3b4b6d330e7b7f61f83a328fe4d141b771e8e52ddee9cac6da87dfc073ab1183d
This performs the same function as -Wl,-z,now, except for ld on macOS.
You can check the binaries using otool -l, looking for the
LC_DYLD_INFO_ONLY section. lazy_bind_off and lazy_bind_size should both
be 0.
man ld:
-bind_at_load
Sets a bit in the mach header of the resulting binary which tells dyld
to bind all symbols when the binary is loaded, rather than lazily.
bd44711e1bb2eee7646f2f8e2e8763d1c216bdb9 build: pass -dead_strip_dylibs to ld on macOS (fanquake)
Pull request description:
This strips some unused dylibs from bitcoin-qt.
```diff
otool -L src/qt/bitcoin-qt
/usr/lib/libSystem.B.dylib
- /System/Library/Frameworks/DiskArbitration.framework/Versions/A/DiskArbitration
/System/Library/Frameworks/IOKit.framework/Versions/A/IOKit
/System/Library/Frameworks/Foundation.framework/Versions/C/Foundation
/System/Library/Frameworks/CoreServices.framework/Versions/A/CoreServices
/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit
/System/Library/Frameworks/ApplicationServices.framework/Versions/A/ApplicationServices
/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation
-/System/Library/Frameworks/Security.framework/Versions/A/Security
/System/Library/Frameworks/SystemConfiguration.framework/Versions/A/SystemConfiguration
/System/Library/Frameworks/CoreGraphics.framework/Versions/A/CoreGraphics
/System/Library/Frameworks/OpenGL.framework/Versions/A/OpenGL
-/System/Library/Frameworks/AGL.framework/Versions/A/AGL
/System/Library/Frameworks/Carbon.framework/Versions/A/Carbon
/usr/lib/libc++.1.dylib
/System/Library/Frameworks/CFNetwork.framework/Versions/A/CFNetwork
/System/Library/Frameworks/CoreText.framework/Versions/A/CoreText
/System/Library/Frameworks/ImageIO.framework/Versions/A/ImageIO
/usr/lib/libobjc.A.dylib
```
`AGL` - ObjC wrapper for OpenGL.
`DiskArbitration` - mount/unmount notifications and events.
`Security` - low level security operations, authentication services.
From `man ld`:
```
Remove dylibs that are unreachable by the entry point or exported symbols.
That is, suppresses the generation of load command commands for dylibs
which supplied no symbols during the link. This option should not be
used when linking against a dylib which is required at runtime for
some indirect reason such as the dylib has an important initializer.
```
ACKs for top commit:
theuni:
ACK bd44711e1bb2eee7646f2f8e2e8763d1c216bdb9.
Tree-SHA512: 9592ce2966d28cb6c58e01efd401f56a4baa5dc5be5313f4fe8454632b578608be65a23c8602772049cd4655a9cb020fdd40d6622a244c301920d8c3db43f99a
This strips some unused dylibs from bitcoin-qt.
From man ld:
Remove dylibs that are unreachable by the entry point or exported symbols.
That is, suppresses the generation of load command commands for dylibs
which supplied no symbols during the link. This option should not be
used when linking against a dylib which is required at runtime for
some indirect reason such as the dylib has an important initializer.
d1c02775aa74a0610809ac54bb241ddad61d2d8c Report amount of data gathered from environment (Pieter Wuille)
64e1e022cedf6776c5dffd488ca2e766adca5dc3 Use thread-safe atomic in perfmon seeder (Pieter Wuille)
d61f2bb076d8f17840a8e79f1583d7f6e3e6d09a Run background seeding periodically instead of unpredictably (Pieter Wuille)
483b94292e89587e5ab40a30b8a90e2f56e847f3 Add information gathered through getauxval() (Pieter Wuille)
11793ea22e1298fa7d3b44a5b6d20830248d8cf4 Feed CPUID data into RNG (Pieter Wuille)
a81c494b4c9a8c2f1a319a03375826f12863706f Use sysctl for seeding on MacOS/BSD (Pieter Wuille)
2554c1b81bb8c40e1989025c6f18e7935720b156 Gather additional entropy from the environment (Pieter Wuille)
c2a262a78c3bcc4d5e13612ab0214874abe15de0 Seed randomness with process id / thread id / various clocks (Pieter Wuille)
723c79666770b30cce9f962bed5ece8cc7d74580 [MOVEONLY] Move cpuid code from random & sha256 to compat/cpuid (Pieter Wuille)
cea3902015185adc88adbd031d919f91bc844fd7 [MOVEONLY] Move perfmon data gathering to new randomenv module (Pieter Wuille)
b51bae1a5a4fa8ef7825dd1bb09e3f47f96d7a5a doc: minor corrections in random.cpp (fanquake)
Pull request description:
This introduces a new `randomenv` module that queries varies non-cryptographic (and non-RNG) sources of entropy available on the system; things like user IDs, system configuration, time, statistics, CPUID data.
The idea is that these provide a fallback in scenarios where system entropy is somehow broken (note that if system entropy *fails* we will abort regardless; this is only meant to function as a last resort against undetected failure). It includes some data sources OpenSSL currently uses, and more.
The separation between random and randomenv is a bit arbitrary, but I felt that all this "non-essential" functionality deserved to be separated from the core random module.
ACKs for top commit:
TheBlueMatt:
utACK d1c02775aa74a0610809ac54bb241ddad61d2d8c. Certainly no longer measuring the time elapsed between a 1ms sleep (which got removed in the latest change) is a fair tradeoff for adding about 2 million other actually-higher-entropy bits :).
laanwj:
ACK d1c02775aa74a0610809ac54bb241ddad61d2d8c
Tree-SHA512: d290a8db6538a164348118ee02079e4f4c8551749ea78fa44b2aad57f5df2ccbc2a12dc7d80d8f3e916d68cdd8e204faf9e1bcbec15f9054eba6b22f17c66ae3
f9af3ced1c69d65c5c530ec5526f5eefaf786126 Android: add all arch support (Block Mechanic)
d419ca7e32bfc71e8dd1f1b91870463eacd6ad8e depends: export dynamic JNI symbols from static qtforandroid.a (Igor Cota)
ed30684d03d3a1d5496e69c488d848fe92ae6fb4 Qt: patch androidjnimain.cpp to make sure JNI is initialised when statically compiled (Igor Cota)
e4c319e8a1c6e40a953036b942bd5d732b0bbf69 builds: remove superfluous config_opts_aarch64_android (Igor Cota)
24ffef0c271739a2ca75feecb816f3218c1850bf Patch libevent when building for Android (fix arc4random_addrandom) (Igor Cota)
f1e40b3e7114b18bc03f45c3a97f9f673543ddef Update bitcoin_qt.m4 (BlockMechanic)
b4057d82618a21720f39f448b689cebf475cc2dc Define TARGET_OS when host is android (Igor Cota)
80b475f159525737e242161397f35d0729449545 Fix Android zlib cross compilation issue (https://stackoverflow.com/questions/21396988/zlib-build-not-configuring-properly-with-cross-compiler-ignores-ar) (Igor Cota)
45f82190150b3feef333724ea7395ba080e700b1 Add full Android build example command and instructions on getting SDK/NDK (Igor Cota)
b68f2a68c211aa2264e9ca824d10a90f4a5a5af4 Add config opts and patch for aarch64_android build of Qt (Igor Cota)
9c4cb0166e801471f8cb3d82656c86bacf051db6 Add ranlib to android.mk hosts file (fix OSX Android NDK build) (Igor Cota)
c2a749c9c16697e744ecfb283fdf4095d0278066 Add example Android host-platform-triplet and options (Igor Cota)
0b0cff3c61610fb56f8c5c9451ace01598117a8d Add support for building Android dependencies (Igor Cota)
Pull request description:
This allows one to build the dependencies with the Android SDK and goes towards fixing #11844. It has been tested to work with:
`make HOST=aarch64-linux-android ANDROID_API_LEVEL=28 ANDROID_TOOLCHAIN_BIN=/home/user/Android/Sdk/ndk-bundle/toolchains/llvm/prebuilt/linux-x86_64/bin NO_QT=1 NO_WALLET=1`
ACKs for top commit:
Sjors:
ACK f9af3ce. I'm OK with merging and then improving later.
Tree-SHA512: cb805115ebe5c9e33db2bf3eab8628808fe3f50052053d8877d8b8e4406d6fea1ed9e5c4dff85d777fb99c81be6ffb9d95a0e6d32344e728e5e0da6c653e2ce7
44f7a8d7a774f82417106c452d793e6f091bc23e Disable _FORTIFY_SOURCE when enable-debug (Andrew Chow)
Pull request description:
The `_FORTIFY_SOURCE` macro is enabled by default when hardening is enabled, but it requires optimization in order to be used. Since we disable all optimization with `--enable-debug`, this macro doesn't actually do anything and instead just causes a lot of warnings to be printed. This PR explicitly disables `_FORTIFY_SOURCE` so that these useless warnings aren't printed.
ACKs for top commit:
laanwj:
Thanks. ACK 44f7a8d7a774f82417106c452d793e6f091bc23e
Tree-SHA512: e9302aef794dfd9ca9d0d032179ecc51d3212a9a0204454419f410011343b27c32e6be05f385051b5b594c607b91b8e0e588f644584d6684429a649a413077d9
Since enable-debug disables optimization entirely, _FORTIFY_SOURCE
does nothing as it requires some kind of optimization enabled. It
instead produces a bunch of useless warnings. So explicitly disable
it when enable-debug so that those warnings are not produced.
Since libtool 1.5.2, on Linux libtool no longer sets RPATH for any
directories in the dynamic linker search path, so there is no longer an
issue.
This commit reverts a98356fee8a44d7d1cb37f22c876fff8f244365e.
as per doc/release-process.md.
Note: On branch-off, these same changes should be made on the release branch, with also these additional changes to both files:
- set `CLIENT_VERSION_REVISION` to `0`
- set `CLIENT_VERSION_IS_RELEASE` to `true`
b4fd0ca9be14c81023db759c405c0f67cfa78166 Include cstring for sanity_test_fdelt if required (Ben Woosley)
7fb886b1b1110de4c79478ac094e64cdcb81f3c8 [moveonly] Split glibc sanity_test_fdelt out (Ben Woosley)
Pull request description:
SmartOS FD_ZERO is implemented in a way that requires
an external declaration of memcpy. We can not simply
include cstring in the existing file because
sanity_test_memcpy is attempting to replace memcpy.
Instead split glibc_sanity into fdelt and memcpy files,
and include <cstring> in glibc_sanity/fdelt.cpp.
Fixes#13581, see also #13619
ACKs for top commit:
laanwj:
Code review an lightly tested (but not on SmartOS) ACK b4fd0ca9be14c81023db759c405c0f67cfa78166
Tree-SHA512: 231306da291ad9eca8ba91bea1e9c27b6c2e96e484d1602e1c2cf27761202f9287ce0bc19fefd000943d2b449d0e5929cd39e2f7e09cf930d89fa520228ccbec
Enable users to see if the prop tests are enabled during the build. This can be particularly helpful as property-based tests are silently auto-enabled by default if librapidcheck is found.
Minor fixes to the docs and help grammar for this option.
d6ac25bdd96589a71006e3ab3f303b091ffaa9e4 autoconf: Sane --enable-debug defaults. (Carl Dong)
Pull request description:
```
Don't optimize even if variables adhere to as-if rule. This is a
somewhat sane default for debugging.
```
-----
Fixes: #14830
This is more of a "do something dumb and have people correct you" kind of PR. The end goal is to have a configure flag that will allow for debugging without annoying "optimized out" messages, for developer experiences' sake. This is the minimal diff, but people have suggested `--enable-debug-slow` in the past.
ACKs for top commit:
jonasschnelli:
Tested ACK d6ac25bdd96589a71006e3ab3f303b091ffaa9e4
Tree-SHA512: 7a5576ad1d33850aff1445ccb71b133f654b455da2d1daed2ed1b82ea773965790a62895aeeab74b23a25513ab96dddb670f9dbc593dd0b8c030694206a99ccf
59cb722fd050393a69f1e0df97d857c893d19d80 Update configure to reject unsafe miniUPnPc API ver (Hennadii Stepanov)
ab2190557ec2757fa48b52855b05561854af49af doc: Add release notes for 15993 (Hennadii Stepanov)
02709e95601c6020a87a6a05ee1d00c13fc38f9b Align formatting with clang-format (Hennadii Stepanov)
91a1b8508358d04685391651aea303ebce1c3d05 Use PACKAGE_NAME in UPnP description (Hennadii Stepanov)
9f76e45b9d6671e2074fb7a3885db703045a791f Drop support of insecure miniUPnPc versions (Hennadii Stepanov)
Pull request description:
1. Minimum supported miniUPnPc API version is set to 10:
- https://packages.ubuntu.com/xenial/libminiupnpc-dev
- https://packages.debian.org/jessie/libminiupnpc-dev
Refs:
- #6583
- #6789
- #10414
2. The hardcoded "Bitcoin" replaced with `PACKAGE_NAME`:
3. Also style-only commit applied.
Pardon: could not reopen my previous PR #15966.
ACKs for top commit:
ryanofsky:
utACK 59cb722fd050393a69f1e0df97d857c893d19d80. Changes since last review: adding a new commit which updates configure script to fall back to disabling upnp if version is too old, adding a requested comment explaining static_assert condition, and fixing a spelling (jessy/jessie)
Tree-SHA512: 42ed11bc2fb2ec83d5dd58e2383da5444a24fd572707f6cf10b622cb8943e28adfcca4750d06801024c4472625b5ea9279516fbd9d2ccebc9bbaafe1d148e80d
84edfc72e5eba3dde824ebd0626e97929a0b1bca Update doc and CI config (qmma)
48bcb2ac249e0e666ce638bb29124558b3283c16 Disable other targets when enable-fuzz is set (qmma)
Pull request description:
This is to fix https://github.com/bitcoin/bitcoin/issues/16094
When the `enable-fuzz` flag is set, disable all other binary targets.
ACKs for top commit:
MarcoFalke:
ACK 84edfc72e5eba3dde824ebd0626e97929a0b1bca (only checked that travis compiled this)
Tree-SHA512: f4ac80526388a67709986b22de88b00bf93ab44ae31a20bd4d8923a4982ab97e015a9f13010081d6ecf6c23ae8afeac7ca9d849d198ce6ebe239aa3127151efc
- When aiming for glibc compatibility, don't use thread_local.
- Add a flag --enable-threadlocal, which, when specified, will
enable/disable thread_local regardless of the value of glibc_compat.
- FreeBSD has a buggy thread_local, don't use it.
