andreacavalli/rocksdb
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Update documentation to point at gcc 4.8

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Summary:
Rocksdb currently has many references to std::map.emplace_back()
which is not implemented in gcc 4.7, but valid in gcc 4.8. Confirmed that
it did not build with gcc 4.7, but builds fine with gcc 4.8
Closes https://github.com/facebook/rocksdb/pull/1272

Differential Revision: D4101385

Pulled By: IslamAbdelRahman

fbshipit-source-id: f6af453
This commit is contained in:
Nipunn Koorapati 2016-10-29 11:54:27 -07:00 committed by Facebook Github Bot
parent b50a81a2bb
commit 25f5742f0b
3 changed files with 9 additions and 10 deletions
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8
INSTALL.md
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@ -40,7 +40,7 @@ your make commands, like this: `PORTABLE=1 make static_lib`
## Supported platforms
* **Linux - Ubuntu**
* Upgrade your gcc to version at least 4.7 to get C++11 support.
* Upgrade your gcc to version at least 4.8 to get C++11 support.
* Install gflags. First, try: `sudo apt-get install libgflags-dev`
If this doesn't work and you're using Ubuntu, here's a nice tutorial:
(http://askubuntu.com/questions/312173/installing-gflags-12-04)
@ -49,8 +49,8 @@ your make commands, like this: `PORTABLE=1 make static_lib`
* Install zlib. Try: `sudo apt-get install zlib1g-dev`.
* Install bzip2: `sudo apt-get install libbz2-dev`.
* **Linux - CentOS**
* Upgrade your gcc to version at least 4.7 to get C++11 support:
`yum install gcc47-c++`
* Upgrade your gcc to version at least 4.8 to get C++11 support:
`yum install gcc48-c++`
* Install gflags:
wget https://gflags.googlecode.com/files/gflags-2.0-no-svn-files.tar.gz
@ -80,7 +80,7 @@ your make commands, like this: `PORTABLE=1 make static_lib`
* Update XCode: run `xcode-select --install` (or install it from XCode App's settting).
* Install via [homebrew](http://brew.sh/).
* If you're first time developer in MacOS, you still need to run: `xcode-select --install` in your command line.
* run `brew tap homebrew/versions; brew install gcc47 --use-llvm` to install gcc 4.7 (or higher).
* run `brew tap homebrew/versions; brew install gcc48 --use-llvm` to install gcc 4.8 (or higher).
* run `brew install rocksdb`
* **iOS**:

4
build_tools/make_package.sh
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@ -65,8 +65,8 @@ function main() {
if [[ -d /vagrant ]]; then
if [[ $OS = "ubuntu" ]]; then
package g++-4.7
export CXX=g++-4.7
package g++-4.8
export CXX=g++-4.8
# the deb would depend on libgflags2, but the static lib is the only thing
# installed by make install

7
util/thread_local.cc
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@ -126,10 +126,9 @@ ThreadLocalPtr::StaticMeta* ThreadLocalPtr::Instance() {
// of using __thread. The major difference between thread_local and __thread
// is that thread_local supports dynamic construction and destruction of
// non-primitive typed variables. As a result, we can guarantee the
// desturction order even when the main thread dies before any child threads.
// However, thread_local requires gcc 4.8 and is not supported in all the
// compilers that accepts -std=c++11 (e.g., the default clang on Mac), while
// the current RocksDB still accept gcc 4.7.
// destruction order even when the main thread dies before any child threads.
// However, thread_local is not supported in all compilers that accept -std=c++11
// (e.g., eg Mac with XCode < 8. XCode 8+ supports thread_local).
static ThreadLocalPtr::StaticMeta* inst = new ThreadLocalPtr::StaticMeta();
return inst;
}