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MSVC: Do not add /GR to CMAKE_CXX_FLAGS by default

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The `/GR` flag has been on by default since MSVC cl 14.0 from VS 2005.
Remove it from the default flags to make it easier for projects to pass
`/GR-` themselves to turn it off.

Projects may be using string processing to replace `/GR` with another
flag, so we cannot simply drop it.  Add a policy to drop it in a
compatible way.

Fixes: #21428
This commit is contained in:
Brad King
2020-11-13 11:15:57 -05:00
parent 6114c8e994
commit c00a6d3967
12 changed files with 88 additions and 1 deletions
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3
Source/cmPolicies.h
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@@ -345,6 +345,9 @@ class cmMakefile;
0, cmPolicies::WARN) \
SELECT(POLICY, CMP0116, \
"Ninja generators transform DEPFILEs from add_custom_command().", 3, \
20, 0, cmPolicies::WARN) \
SELECT(POLICY, CMP0117, \
"MSVC RTTI flag /GR is not added to CMAKE_CXX_FLAGS by default.", 3, \
20, 0, cmPolicies::WARN)
#define CM_SELECT_ID(F, A1, A2, A3, A4, A5, A6) F(A1)