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fcc11d05a6
Add a new function $(let ...) which allows lexically scoped variables. * NEWS: Add information on this feature. * doc/make.texi (Let Function): Document the 'let' function. * src/function.c (func_let): Create the 'let' built-in function. * tests/scripts/functions/let: Test the 'let' built-in function.
111 lines
2.8 KiB
Perl
111 lines
2.8 KiB
Perl
# -*-perl-*-
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# $Id$
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$description = "Test the let function.";
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$details = "This is a test of the let function in gnu make.
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This function destructures a list of values and binds each
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value to a variable name in a list of variable names.
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Superfluous variable names are assigned the empty string and
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the remaining values are assigned to the last variable name.
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The binding holds for the duration of the evaluation of the
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given text and no longer. The general form of the command
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is $(let \$vars,\$list,\$text). Several types of let
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assignments are tested\n";
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# check for mismatched var and list word counts
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run_make_test(q!
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a = bad
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b = news
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x = $(let a b,1 2,$a $b)
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y = $(let a,1 2,$a)
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z = $(let a b,1,$a $b)
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all:;@echo 'a=,$a,' 'b=,$b,' 'x=,$x,' 'y=,$y,' 'z=,$z,'
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!,
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'', "a=,bad, b=,news, x=,1 2, y=,1 2, z=,1 ,\n");
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# check for whitespace
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run_make_test(q!
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a = bad
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b = news
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x = $(let a b, 1 2 ,+$a+$b+)
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y = $(let a, 1 2 ,+$a+)
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z = $(let a b, 1 ,+$a+$b+)
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all:;@echo 'a=,$a,' 'b=,$b,' 'x=,$x,' 'y=,$y,' 'z=,$z,'
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!,
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'', "a=,bad, b=,news, x=,+1+2 +, y=,+1 2 +, z=,+1++,\n");
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# Allow empty variable names and empty value list.
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# We still expand the list and body.
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run_make_test('
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null =
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x = $(let $(null),$(info side-effect),abc)
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y = $(let y,,$ydef)
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all: ; @echo $x$y',
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'', "side-effect\nabcdef\n");
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# The example macro from the manual.
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run_make_test('
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reverse = $(let first rest,$1,$(if $(rest),$(call reverse,$(rest)) )$(first))
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all: ; @echo $(call reverse, \
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moe miny meeny eeny \
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)',
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'', "eeny meeny miny moe\n");
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# Set an environment variable that we can test in the makefile.
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$ENV{FOOFOO} = 'foo foo';
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# Verify masking: expansion outside the scope of let is unaffected.
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run_make_test('
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auto_var = \
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udef \
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CC \
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FOOFOO \
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MAKE \
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foo \
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CFLAGS \
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WHITE \
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@ \
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<
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av = $(foreach var, $(auto_var), $(origin $(var)) )
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foo = bletch null @ garf
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override WHITE := BLACK
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define mktarget
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target: foo := $(foo)
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target: ; @echo $(AR)_$(foo)_
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endef
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all: auto target
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auto: ; @echo $(let $(auto_var),,$(av)) $(av)
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$(let AR foo,bar foo ,$(eval $(value mktarget)))',
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'-e WHITE=WHITE CFLAGS=',
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"automatic automatic automatic automatic automatic automatic automatic automatic automatic undefined default environment default file command line override automatic automatic
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ar_foo _
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");
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# Check some error conditions.
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run_make_test('
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x = $(let )
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y = $x
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all: ; @echo $y',
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'',
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"#MAKEFILE#:2: *** insufficient number of arguments (1) to function 'let'. Stop.",
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512);
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run_make_test('
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x = $(let x,y)
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y := $x
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all: ; @echo $y',
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'',
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"#MAKEFILE#:2: *** insufficient number of arguments (2) to function 'let'. Stop.",
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512);
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1;
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