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Documentation: Clarify a few subtleties

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* Clarify accepted values of <LANG> suffix in CMAKE_COMPILER_IS_GNU<LANG>.

* Clarify fact that target property GENERATOR_FILE_NAME usually cannot be
  used at configure time.

* Clarify that enable_language() can only be used in global scope of
  top-level project using language.

* State that enable_language(... OPTIONAL) currently doesn't work.

* Document regular expression operator precedence.
This commit is contained in:
Petr Kmoch
2013-03-07 14:33:35 +01:00
committed by Brad King
parent 5990a5637e
commit 3cf2f67adc
4 changed files with 24 additions and 3 deletions
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7
Source/cmStringCommand.h
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@@ -136,6 +136,9 @@ public:
" [^ ] Matches any character(s) not inside the brackets\n"
" - Inside brackets, specifies an inclusive range between\n"
" characters on either side e.g. [a-f] is [abcdef]\n"
" To match a literal - using brackets, make it the first\n"
" or the last character e.g. [+*/-] matches basic\n"
" mathematical operators.\n"
" * Matches preceding pattern zero or more times\n"
" + Matches preceding pattern one or more times\n"
" ? Matches preceding pattern zero or once only\n"
@@ -144,6 +147,10 @@ public:
" in the REGEX REPLACE operation. Additionally it is saved\n"
" by all regular expression-related commands, including \n"
" e.g. if( MATCHES ), in the variables CMAKE_MATCH_(0..9).\n"
"*, + and ? have higher precedence than concatenation. | has lower "
"precedence than concatenation. This means that the regular expression "
"\"^ab+d$\" matches \"abbd\" but not \"ababd\", and the regular "
"expression \"^(ab|cd)$\" matches \"ab\" but not \"abd\".\n"
"TIMESTAMP will write a string representation of "
"the current date and/or time to the output variable.\n"
"Should the command be unable to obtain a timestamp "