247 lines
7.1 KiB
Makefile
247 lines
7.1 KiB
Makefile
# $Id: escape.mk,v 1.1.1.2 2014/11/06 01:40:37 sjg Exp $
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#
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# Test backslash escaping.
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# Extracts from the POSIX 2008 specification
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# <http://pubs.opengroup.org/onlinepubs/9699919799/utilities/make.html>:
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#
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# Comments start with a <number-sign> ( '#' ) and continue until an
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# unescaped <newline> is reached.
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#
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# When an escaped <newline> (one preceded by a <backslash>) is found
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# anywhere in the makefile except in a command line, an include
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# line, or a line immediately preceding an include line, it shall
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# be replaced, along with any leading white space on the following
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# line, with a single <space>.
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#
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# When an escaped <newline> is found in a command line in a
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# makefile, the command line shall contain the <backslash>, the
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# <newline>, and the next line, except that the first character of
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# the next line shall not be included if it is a <tab>.
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#
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# When an escaped <newline> is found in an include line or in a
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# line immediately preceding an include line, the behavior is
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# unspecified.
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#
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# Notice that the behaviour of <backslash><backslash> or
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# <backslash><anything other than newline> is not mentioned. I think
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# this implies that <backslash> should be taken literally everywhere
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# except before <newline>.
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#
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# Our practice, despite what POSIX might say, is that "\#"
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# in a variable assignment stores "#" as part of the value.
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# The "\" is not taken literally, and the "#" does not begin a comment.
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#
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# Also, our practice is that an even number of backslashes before a
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# newline in a variable assignment simply stores the backslashes as part
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# of the value, and treats the newline as though it was not escaped.
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# Similarly, ann even number of backslashes before a newline in a
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# command simply uses the backslashes as part of the command test, but
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# does not escape the newline. This is compatible with GNU make.
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all: .PHONY
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# We will add dependencies like "all: yet-another-test" later.
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# Some variables to be expanded in tests
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#
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a = aaa
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A = ${a}
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# Backslash at end of line in a comment\
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should continue the comment. \
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# This is also tested in comment.mk.
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__printvars: .USE .MADE
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@echo ${.TARGET}
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${.ALLSRC:@v@ printf "%s=:%s:\n" ${v:Q} ${${v}:Q}; @}
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# Embedded backslash in variable should be taken literally.
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#
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VAR1BS = 111\111
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VAR1BSa = 111\${a}
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VAR1BSA = 111\${A}
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VAR1BSda = 111\$${a}
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VAR1BSdA = 111\$${A}
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VAR1BSc = 111\# backslash escapes comment char, so this is part of the value
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VAR1BSsc = 111\ # This is a comment. Value ends with <backslash><space>
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all: var-1bs
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var-1bs: .PHONY __printvars VAR1BS VAR1BSa VAR1BSA VAR1BSda VAR1BSdA \
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VAR1BSc VAR1BSsc
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# Double backslash in variable should be taken as two literal backslashes.
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#
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VAR2BS = 222\\222
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VAR2BSa = 222\\${a}
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VAR2BSA = 222\\${A}
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VAR2BSda = 222\\$${a}
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VAR2BSdA = 222\\$${A}
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VAR2BSc = 222\\# backslash does not escape comment char, so this is a comment
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VAR2BSsc = 222\\ # This is a comment. Value ends with <backslash><backslash>
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all: var-2bs
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var-2bs: .PHONY __printvars VAR2BS VAR2BSa VAR2BSA VAR2BSda VAR2BSdA \
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VAR2BSc VAR2BSsc
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# Backslash-newline in a variable setting is replaced by a single space.
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#
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VAR1BSNL = 111\
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111
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VAR1BSNLa = 111\
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${a}
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VAR1BSNLA = 111\
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${A}
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VAR1BSNLda = 111\
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$${a}
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VAR1BSNLdA = 111\
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$${A}
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VAR1BSNLc = 111\
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# this should be processed as a comment
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VAR1BSNLsc = 111\
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# this should be processed as a comment
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all: var-1bsnl
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var-1bsnl: .PHONY
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var-1bsnl: .PHONY __printvars \
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VAR1BSNL VAR1BSNLa VAR1BSNLA VAR1BSNLda VAR1BSNLdA \
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VAR1BSNLc VAR1BSNLsc
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# Double-backslash-newline in a variable setting.
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# Both backslashes should be taken literally, and the newline is NOT escaped.
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#
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# The second lines below each end with '=' so that they will not
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# generate syntax errors regardless of whether or not they are
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# treated as part of the value.
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#
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VAR2BSNL = 222\\
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222=
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VAR2BSNLa = 222\\
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${a}=
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VAR2BSNLA = 222\\
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${A}=
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VAR2BSNLda = 222\\
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$${a}=
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VAR2BSNLdA = 222\\
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$${A}=
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VAR2BSNLc = 222\\
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# this should be processed as a comment
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VAR2BSNLsc = 222\\
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# this should be processed as a comment
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all: var-2bsnl
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var-2bsnl: .PHONY __printvars \
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VAR2BSNL VAR2BSNLa VAR2BSNLA VAR2BSNLda VAR2BSNLdA \
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VAR2BSNLc VAR2BSNLsc
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# Triple-backslash-newline in a variable setting.
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# First two should be taken literally, and last should escape the newline.
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#
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# The second lines below each end with '=' so that they will not
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# generate syntax errors regardless of whether or not they are
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# treated as part of the value.
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#
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VAR3BSNL = 333\\\
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333=
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VAR3BSNLa = 333\\\
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${a}=
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VAR3BSNLA = 333\\\
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${A}=
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VAR3BSNLda = 333\\\
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$${a}=
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VAR3BSNLdA = 333\\\
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$${A}=
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VAR3BSNLc = 333\\\
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# this should be processed as a comment
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VAR3BSNLsc = 333\\\
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# this should be processed as a comment
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all: var-3bsnl
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var-3bsnl: .PHONY __printvars \
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VAR3BSNL VAR3BSNLa VAR3BSNLA VAR3BSNLda VAR3BSNLdA \
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VAR3BSNLc VAR3BSNLsc
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# Backslash-newline in a variable setting, plus any amount of white space
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# on the next line, is replaced by a single space.
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#
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VAR1BSNL00= first line\
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# above line is entirely empty, and this is a comment
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VAR1BSNL0= first line\
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no space on second line
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VAR1BSNLs= first line\
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one space on second line
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VAR1BSNLss= first line\
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two spaces on second line
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VAR1BSNLt= first line\
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one tab on second line
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VAR1BSNLtt= first line\
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two tabs on second line
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VAR1BSNLxx= first line\
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many spaces and tabs [ ] on second line
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all: var-1bsnl-space
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var-1bsnl-space: .PHONY __printvars \
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VAR1BSNL00 VAR1BSNL0 VAR1BSNLs VAR1BSNLss VAR1BSNLt VAR1BSNLtt \
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VAR1BSNLxx
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# Backslash-newline in a command is retained.
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#
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# The "#" in "# second line without space" makes it a comment instead
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# of a syntax error if the preceding line is parsed incorretly.
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# The ":" in "third line':" makes it look like the start of a
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# target instead of a syntax error if the first line is parsed incorrectly.
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#
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all: cmd-1bsnl
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cmd-1bsnl: .PHONY
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@echo ${.TARGET}
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echo :'first line\
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#second line without space\
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third line':
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echo :'first line\
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second line spaces should be retained':
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echo :'first line\
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second line tab should be elided':
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echo :'first line\
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only one tab should be elided, second tab remains'
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# When backslash-newline appears at the end of a command script,
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# both the backslash and the newline should be passed to the shell.
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# The shell should elide the backslash-newline.
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#
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all: cmd-1bsnl-eof
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cmd-1bsnl-eof:
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@echo ${.TARGET}
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echo :'command ending with backslash-newline'; \
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# above line must be blank
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# Double-backslash-newline in a command.
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# Both backslashes are retained, but the newline is not escaped.
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# XXX: This may differ from POSIX, but matches gmake.
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#
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# When make passes two backslashes to the shell, the shell will pass one
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# backslash to the echo commant.
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#
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all: cmd-2bsnl
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cmd-2bsnl: .PHONY
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@echo ${.TARGET}
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echo take one\\
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# this should be a comment
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echo take two\\
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echo take three\\
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# Triple-backslash-newline in a command is retained.
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#
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all: cmd-3bsnl
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cmd-3bsnl: .PHONY
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@echo ${.TARGET}
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echo :'first line\\\
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#second line without space\\\
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third line':
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echo :'first line\\\
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second line spaces should be retained':
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echo :'first line\\\
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second line tab should be elided':
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echo :'first line\\\
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only one tab should be elided, second tab remains'
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