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[Seqan-dev] Precompiled header

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Hi all,

I am trying to generate precompiled header using g++/clang for seqan to reduce the compile time of my program. But it throws a lot of errors. 

For example for seq_io.h:

In file included from seq_io.h:44:
In file included from /Users/gany/Development/include/seqan/basic.h:80:
In file included from /Users/gany/Development/include/seqan/basic/basic_math.h:44:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cmath:638:9: error: no member named 'signbit' in the global namespace; did you mean 'sigwait'?
using ::signbit;
      ~~^
/usr/include/signal.h:101:5: note: 'sigwait' declared here
int     sigwait(const sigset_t * __restrict, int * __restrict) __DARWIN_ALIAS_C(sigwait);
        ^
In file included from seq_io.h:44:
In file included from /Users/gany/Development/include/seqan/basic.h:80:
In file included from /Users/gany/Development/include/seqan/basic/basic_math.h:44:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cmath:639:9: error: no member named 'fpclassify' in the global namespace
using ::fpclassify;
      ~~^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cmath:640:9: error: no member named 'isfinite' in the global namespace
using ::isfinite;
      ~~^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cmath:641:9: error: no member named 'isinf' in the global namespace
using ::isinf;
      ~~^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cmath:642:9: error: no member named 'isnan' in the global namespace
using ::isnan;
      ~~^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cmath:643:9: error: no member named 'isnormal' in the global namespace
using ::isnormal;
      ~~^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cmath:644:7: error: no member named 'isgreater' in the global namespace; did you mean '::std::greater'?
using ::isgreater;
      ^~
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/functional:709:30: note: '::std::greater' declared here
struct _LIBCPP_TYPE_VIS_ONLY greater : binary_function<_Tp, _Tp, bool>
                             ^
In file included from seq_io.h:44:
In file included from /Users/gany/Development/include/seqan/basic.h:80:
In file included from /Users/gany/Development/include/seqan/basic/basic_math.h:44:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cmath:645:7: error: no member named 'isgreaterequal' in the global namespace; did you mean '::std::greater_equal'?
using ::isgreaterequal;
      ^~
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/functional:738:30: note: '::std::greater_equal' declared here
struct _LIBCPP_TYPE_VIS_ONLY greater_equal : binary_function<_Tp, _Tp, bool>
                             ^
In file included from seq_io.h:44:
In file included from /Users/gany/Development/include/seqan/basic.h:80:
In file included from /Users/gany/Development/include/seqan/basic/basic_math.h:44:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cmath:646:9: error: no member named 'isless' in the global namespace
using ::isless;
      ~~^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cmath:647:9: error: no member named 'islessequal' in the global namespace
using ::islessequal;
      ~~^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cmath:648:9: error: no member named 'islessgreater' in the global namespace
using ::islessgreater;
      ~~^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cmath:649:9: error: no member named 'isunordered' in the global namespace
using ::isunordered;
      ~~^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cmath:650:9: error: no member named 'isunordered' in the global namespace
using ::isunordered;
      ~~^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cmath:652:9: error: no member named 'float_t' in the global namespace
using ::float_t;
      ~~^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cmath:653:9: error: no member named 'double_t' in the global namespace
using ::double_t;
      ~~^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cmath:660:39: error: use of undeclared identifier 'fabsf'
abs(float __lcpp_x) _NOEXCEPT {return fabsf(__lcpp_x);}
                                      ^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cmath:664:40: error: use of undeclared identifier 'fabs'
abs(double __lcpp_x) _NOEXCEPT {return fabs(__lcpp_x);}
                                       ^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cmath:668:45: error: use of undeclared identifier 'fabsl'
abs(long double __lcpp_x) _NOEXCEPT {return fabsl(__lcpp_x);}
                                            ^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cmath:675:9: error: no member named 'acos' in the global namespace
using ::acos;
      ~~^
fatal error: too many errors emitted, stopping now [-ferror-limit=]
20 errors generated.

Could anyone help me with this? Many thanks!

BTW, the command I use to generate precompiled header is:

g++ -std=c++11 -x c++-header seq_io.h -o seq_io.h.pch

Thanks!

Yue Gan
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