Hello, This change reworks the VxWorks specific os_defines.h internal lisbstdc++ header to help fix build and runtime failures of various kinds in environments from 6.4/6.9 to 7 SR640, based on experiments and observations conducted against real installs of these OSes for different CPU architectures.
This is touching a vxworks specific header file and libstdc++ is currently not included in standard builds, so I'm planning to commit to mainline in preparation of further changes which will allow relaxing the current exclusion. Best Regards, Olivier 2019-12-13 Jerome Lambourg <lambo...@adacore.com> Olivier Hainque <hain...@adacore.com> libstdc++ * config/os/vxworks/os_defines.h (NOMINMAX): Always redefine to 1. (_NO_CPP_INLINES): Likewise. (_GLIBCXX_USE_WEAK_REF): Define to 1 for RTP on VxWorks >= 7, to 0 otherwise. (_GLIBCXX_HAVE_TLS): Define to 1. For VxWorks >= 7: (_GLIBCXX_USE_C99_MATH): Define to 1. (_GLIBCXX_USE_C99_MATH_FP_MACROS_DYNAMIC): Define to 0. (_HAS_TR1_DECLARATIONS): Redefine to 0. For VxWorks < 7, RTP: (_GLIBCXX_INCLUDE_NEXT_C_HEADERS): Define to 1. (_GLIBCXX_USE_C99_FP_MACROS_DYNAMIC): Redefine to 1. (__CORRECT_ISO_CPP11_MATH_H_PROTO_FP): Define. For VxWorks < 7, kernel: #include <vxWorks.h>
libstdc++-v3/config/os/vxworks/os_defines.h | 67 +++++++++++++++++++-- 1 file changed, 63 insertions(+), 4 deletions(-) diff --git a/libstdc++-v3/config/os/vxworks/os_defines.h b/libstdc++-v3/config/os/vxworks/os_defines.h index 3a9a9587622..c5573a40b0d 100644 --- a/libstdc++-v3/config/os/vxworks/os_defines.h +++ b/libstdc++-v3/config/os/vxworks/os_defines.h @@ -33,10 +33,69 @@ // System-specific #define, typedefs, corrections, etc, go here. This // file will come before all others. -//Keep vxWorks from defining min()/max() as macros -#ifdef NOMINMAX -#undef NOMINMAX +// The system environment we can rely on varies across VxWorks +// versions. +#include <_vxworks-versions.h> + +// Weak refs are supported starting with VxWorks 7, in RTP mode only + +#if _VXWORKS_MAJOR_GE(7) && defined(__RTP__) +#define _GLIBCXX_USE_WEAK_REF 1 +#else +#define _GLIBCXX_USE_WEAK_REF 0 #endif + +// We support TLS on VxWorks (either directly or with emutls) +#define _GLIBCXX_HAVE_TLS 1 + +// VxWorks7 comes with a DinkumWare library and the system headers which we +// are going to include for libstdc++ have a few related intrinsic +// assumptions. We control our own configuration here to best integrate with +// this environment: use C99 math headers, do not use the FP macros for +// dynamic cast by default (overriden for RTPs below) and arrange to disable +// the system TR1 declarations as we'll provide ours. + +#if _VXWORKS_MAJOR_GE(7) + +#define _GLIBCXX_USE_C99_MATH 1 +#define _GLIBCXX_USE_C99_FP_MACROS_DYNAMIC 0 + +#undef _HAS_TR1_DECLARATIONS +#define _HAS_TR1_DECLARATIONS 0 + +#else // VXWORKS_MAJOR < 7 + +// For RTPs, use the VxWorks headers as a basis, from which we can use +// C99 dynamic FP macros and expect (after fixincludes) accurate c++11 +// prototypes for FP. + +#ifdef __RTP__ + +#define _GLIBCXX_INCLUDE_NEXT_C_HEADERS 1 + +#undef _GLIBCXX_USE_C99_FP_MACROS_DYNAMIC +#define _GLIBCXX_USE_C99_FP_MACROS_DYNAMIC 1 + +#define __CORRECT_ISO_CPP11_MATH_H_PROTO_FP + +#else // !__RTP__ + +// libstdc++ will include system headers and vxWorks.h ought to have +// been included ahead for VxWorks kernel modules prior to VxWorks 7 +#include <vxWorks.h> + +#endif // __RTP__ + +#endif // _VXWORKS_MAJOR >= 7 + +// The min/max "functions" may be refered to with a namespace prefix. +// Prevent possible redefinitions as macros from VxWorks headers. +#undef NOMINMAX #define NOMINMAX 1 -#endif +// Do not include the inline definitions from VxWorks headers, as we'll +// want to use the ones from libstdc++ instead. +#undef _NO_CPP_INLINES +#define _NO_CPP_INLINES 1 + +#endif // _GLIBCXX_OS_DEFINES -- 2.17.1