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cmLocalGenerator: Explain standard flag selection logic in comments

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This commit is contained in:
Brad King
2017-07-14 10:09:18 -04:00
parent 0f096b8d73
commit fca0546175
1 changed files with 7 additions and 2 deletions
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9
Source/cmLocalGenerator.cxx
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@@ -1637,8 +1637,10 @@ void cmLocalGenerator::AddCompilerRequirementFlag(
return; return;
} }
// Greater or equal because the standards are stored in // If the standard requested is older than the compiler's default
// backward chronological order. // then we need to use a flag to change it. The comparison is
// greater-or-equal because the standards are stored in backward
// chronological order.
if (stdIt >= defaultStdIt) { if (stdIt >= defaultStdIt) {
std::string option_flag = std::string option_flag =
"CMAKE_" + lang + *stdIt + "_" + type + "_COMPILE_OPTION"; "CMAKE_" + lang + *stdIt + "_" + type + "_COMPILE_OPTION";
@@ -1649,6 +1651,9 @@ void cmLocalGenerator::AddCompilerRequirementFlag(
return; return;
} }
// The standard requested is at least as new as the compiler's default,
// and the standard request is not required. Decay to the newest standard
// for which a flag is defined.
for (; stdIt < defaultStdIt; ++stdIt) { for (; stdIt < defaultStdIt; ++stdIt) {
std::string option_flag = std::string option_flag =
"CMAKE_" + lang + *stdIt + "_" + type + "_COMPILE_OPTION"; "CMAKE_" + lang + *stdIt + "_" + type + "_COMPILE_OPTION";