Introduce a new pseudo-target .EXPORTVAR which allows to put a

make macro into the environment of programs executed by make. This
has approximately the same function as gmake's export directive.
The form of a pseudo target was deliberately choosen to minimize work
for POSIX compatibility (Makefiles are not allowed to use any targets
starting with a dot and consisting only of uppercase letters except those
specified in the standard when they want POSIX compatible behaviour, so
such a Makefile can never contain .EXPORTVAR.)
Change the handling of macros coming from the environment: instead
of asking the environment for each variable we could not find otherwise
put all the environment variables in a special variable environment just
at start up.

This has been tested on the ports cluster by kris.

Submitted by:	Max Okumoto <okumoto@ucsd.edu>

1 files changed, 5 insertions, 1 deletions

diff --git a/usr.bin/make/parse.c b/usr.bin/make/parse.c
index 56f9e24..fb48a77 100644
--- a/usr.bin/make/parse.c
+++ b/usr.bin/make/parse.c
@@ -153,13 +153,13 @@ typedef enum {
 	Begin,		/* .BEGIN */
 	Default,	/* .DEFAULT */
 	End,		/* .END */
+	ExportVar,	/* .EXPORTVAR */
 	Ignore,		/* .IGNORE */
 	Includes,	/* .INCLUDES */
 	Interrupt,	/* .INTERRUPT */
 	Libs,		/* .LIBS */
 	MFlags,		/* .MFLAGS or .MAKEFLAGS */
 	Main,		/* .MAIN and we don't have anyth. user-spec. to make */
-	NoExport,	/* .NOEXPORT */
 	Not,		/* Not special */
 	NotParallel,	/* .NOTPARALELL */
 	Null,		/* .NULL */
@@ -204,6 +204,7 @@ static const struct keyword {
 	{ ".DEFAULT",		Default,	0 },
 	{ ".END",		End,		0 },
 	{ ".EXEC",		Attribute,	OP_EXEC },
+	{ ".EXPORTVAR",		ExportVar,	0 },
 	{ ".IGNORE",		Ignore,		OP_IGNORE },
 	{ ".INCLUDES",		Includes,	0 },
 	{ ".INTERRUPT",		Interrupt,	0 },
@@ -1170,6 +1171,9 @@ ParseDoDependency(char *line)
 		}
 		Lst_Destroy(&paths, NOFREE);
 
+	} else if (specType == ExportVar) {
+		Var_SetEnv(line, VAR_GLOBAL);
+
 	} else {
 		/* list of sources in order */
 		Lst curSrcs = Lst_Initializer(curSrc);