CODEWITHSUNDEEP
c++clangpragmamacos-sierralibc++
phmsk
phmsk

Reputation: 186

Unknown warning group '-Wmaybe-unintialized' Mac OS Sierra

When trying to compile my software in Mac OS Sierra I run into an issue regarding unknown pragmas (See snippet below). According to a colleague, the software is able to compile in Mac OS X Yosemite with the same clang version (4.2.1). The compiling flags used are: -std=c++11 -stdlib=libc++. Using stdlibc++ is not an option as it does not include std::shared_ptr.

error: unknown warning group '-Wmaybe-uninitialized', ignored
  [-Werror,-Wunknown-pragmas]
                    #pragma GCC diagnostic ignored "-Wmaybe-uninitialized"

Here is a print out of g++ --version

Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/usr/include/c++/4.2.1
Apple LLVM version 8.0.0 (clang-800.0.42.1)
Target: x86_64-apple-darwin16.1.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

Unsure where to take it from here, any input is much appreciated.

Upvotes: 4

Views: 3384

Answers (1)

Martin Gerhardy
Martin Gerhardy

Reputation: 2000

Instead of writing

#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"

you should do

#if !defined(__has_warning) || __has_warning("-Wmaybe-uninitialized")
#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
#endif

Upvotes: 10

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