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libstdc++/7680 * include/c_std/std_cmath.h (__gnu_cx::__c99_binding): New namespace. Populate it with multiple legal ways to obtain the C99 float transcendentals. Use them instead of direct global reference. (C99 FP capture): Guard usage with _GLIBCPP_USE_C99_FP_MACROS_DYNAMIC. * docs/html/17_intro/porting.texi (_GLIBCPP_USE_C99_FLOAT_TRANSCENDENTALS_CHECK): New macro. (_GLIBCPP_USE_C99_FLOAT_TRANSCENDENTALS_DYNAMIC): New macro. (_GLIBCPP_USE_C99_FP_MACROS_DYNAMIC): New macro. * config/os/bsd/freebsd/os_defines.h (_GLIBCPP_USE_C99_FLOAT_TRANSCENDENTALS_CHECK): New macro. (_GLIBCPP_USE_C99_FLOAT_TRANSCENDENTALS_DYNAMIC): New macro. * testsuite/26_numerics/c_math_dynamic.cc: New file. From-SVN: r65624
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