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Diffstat (limited to 'docs/markdown/snippets')
| -rw-r--r-- | docs/markdown/snippets/msvc_cplusplus_define.md | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/docs/markdown/snippets/msvc_cplusplus_define.md b/docs/markdown/snippets/msvc_cplusplus_define.md new file mode 100644 index 0000000..2c5648d --- /dev/null +++ b/docs/markdown/snippets/msvc_cplusplus_define.md @@ -0,0 +1,15 @@ +## MSVC now sets the __cplusplus #define accurately + +MSVC will always return `199711L` for `__cplusplus`, even when a newer c++ +standard is explicitly requested, unless you pass a specific option to the +compiler for MSVC 2017 15.7 and newer. Older versions are unaffected by this. + +Microsoft's stated rationale is that "a lot of existing code appears to depend +on the value of this macro matching 199711L", therefore for compatibility with +such (MSVC-only) code they will require opting in to the standards-conformant +value. + +Meson now always sets the option if it is available, as it is unlikely that +users want the default behavior, and *impossible* to use the default behavior +in cross-platform code (which frequently breaks as soon as the first person +tries to compile using MSVC). |