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Make CppAsString2() more visible in c.h.

For some reason this standard C string-processing hack was buried in anNLS-related section of c.h. Put it beside CppAsString() so that peopleare more likely to find it and not be tempted to reinvent local copies,as I nearly did. And provide a more helpful comment, too.

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src/include
- c.h

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`‎src/include/c.h`

Lines changed: 3 additions & 4 deletions

Original file line number	Diff line number	Diff line change
`@@ -149,6 +149,8 @@`
`149`	`149`	`/*`
`150`	`150`	`* CppAsString`
`151`	`151`	`*Convert the argument to a string, using the C preprocessor.`
	`152`	`+ * CppAsString2`
	`153`	`+ *Convert the argument to a string, after one round of macro expansion.`
`152`	`154`	`* CppConcat`
`153`	`155`	`*Concatenate two arguments together, using the C preprocessor.`
`154`	`156`	`*`
`@@ -157,6 +159,7 @@`
`157`	`159`	`* backward compatibility with existing PostgreSQL code.`
`158`	`160`	`*/`
`159`	`161`	`#defineCppAsString(identifier) #identifier`
	`162`	`+#defineCppAsString2(x)CppAsString(x)`
`160`	`163`	`#defineCppConcat(x,y)x##y`
`161`	`164`
`162`	`165`	`/*`
`@@ -1002,10 +1005,6 @@ typedef NameData *Name;`
`1002`	`1005`	`*`
`1003`	`1006`	`* Make sure this matches the installation rules in nls-global.mk.`
`1004`	`1007`	`*/`
`1005`		`-`
`1006`		`-/* need a second indirection because we want to stringize the macro value, not the name */`
`1007`		`-#defineCppAsString2(x) CppAsString(x)`
`1008`		`-`
`1009`	`1008`	`#ifdefSO_MAJOR_VERSION`
`1010`	`1009`	`#definePG_TEXTDOMAIN(domain) (domain CppAsString2(SO_MAJOR_VERSION) "-" PG_MAJORVERSION)`
`1011`	`1010`	`#else`

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Commit9cfc4de

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`‎src/include/c.h`

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