View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0000693 | 1003.1(2013)/Issue7+TC1 | Shell and Utilities | public | 2013-05-07 21:06 | 2019-06-10 08:55 |
| Reporter | steffen | Assigned To | |||
| Priority | normal | Severity | Editorial | Type | Clarification Requested |
| Status | Closed | Resolution | Accepted As Marked | ||
| Name | Steffen Nurpmeso | ||||
| Organization | |||||
| User Reference | |||||
| Section | XCU, chapter 4, make(1) | ||||
| Page Number | 2941 | ||||
| Line Number | 97291-97309 | ||||
| Interp Status | Approved | ||||
| Final Accepted Text | 0000693:0001631 | ||||
| Summary | 0000693: Clarification on export status of make variables | ||||
| Description | Whereas the standard defines exactly the significance of the sources of macros / variables (command line, MAKEFLAGS environment variable, environment content, in the Makefile), it does not talk about the resulting export status of the macro / variable that will be passed down the call chain. This shell snippet can be used for a quick test: #!/bin/sh - [ -z "${MAKE}" ] && MAKE=make SHELLVAR=shell export SHELLVAR MAKE cat > t1.make << \! SHELLVAR = t1 all: @$(MAKE) -f t2.make all ! cat > t2.make << \! all: @echo "Should echo t1, but echoes $(SHELLVAR)" ! ${MAKE} -f t1.make all rm -f t1.make t2.make GNU make (3.82, Slackware 14; 3.81, Mac OS X) echoes "t1", FreeBSD 10.0 make(1), NetBSD 6.99.19 make(1), OpenBSD 5.3 make(1) as well as smake(1) 1.2 echo "shell". | ||||
| Desired Action | On page 2941, append to the paragraph on the lines 97306-97309 Macros defined in the makefile(s) shall override macro definitions that occur before them in the makefile(s) and macro definitions from source 4. If the −e option is not specified, macros defined in the makefile(s) shall override macro definitions from source 3. Macros defined in the makefile(s) shall not override macro definitions from source 1 or source 2. the sentence The finally chosen macro definition shall be exported into the environment[, and passed down the call chain]. | ||||
| Tags | tc2-2008 | ||||
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Line 97787 reminds: "Macros are not exported to the environment of commands to be run. This was never the case in any historical make and would have serious consequences. The environment is the same as the environment to make except that MAKEFLAGS and macros defined on the make command line are added." Since the standard does not document 'export' in a makefile, we'd need a lot more wording to add that as a new requirement. |
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Interpretation response ------------------------ The standard does not speak to this issue, and as such no conformance distinction can be made between alternative implementations based on this. This is being referred to the sponsor. Rationale: ------------- None. Notes to the Editor (not part of this interpretation): ------------------------------------------------------- At page 2942 line 97319 after: Before the makefile(s) are read, all of the make utility command line macro definitions (except the MAKEFLAGS macro or the SHELL macro) shall be added to the environment of make. Other implementation-defined variables may also be added to the environment of make. append: Macros defined by the MAKEFLAGS environment variable and macros defined in the makefile(s) shall not be added to the environment of make if they are not already in its environment. With the exception of SHELL (see below), it is unspecified whether macros defined in these ways update the value of an environment variable that already exists in the environment of make. At page 2953 line 97788 change: The environment is the same as the environment to make except that MAKEFLAGS and macros defined on the make command line are added. to: The environment is the same as the environment to make except that MAKEFLAGS and macros defined on the make command line are added, and except that macros defined by the MAKEFLAGS environment variable and macros defined in the makefile(s) may update the value of an existing environment variable (other than SHELL). At page 2954 line 97849 change FUTURE DIRECTIONS from: None. to: Some implementations of make include an "export" directive to add specified make variables to the environment. This may be considered for standardization in a future revision. |
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Interpretation Proposed 6 Sep 2013 |
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Interpretation approved 14 October 2013 |
| Date Modified | Username | Field | Change |
|---|---|---|---|
| 2013-05-07 21:06 | steffen | New Issue | |
| 2013-05-07 21:06 | steffen | Name | => Steffen Nurpmeso |
| 2013-05-07 21:06 | steffen | Section | => XCU, chapter 4, make(1) |
| 2013-05-07 21:06 | steffen | Page Number | => 2941 |
| 2013-05-07 21:06 | steffen | Line Number | => 97291-97309 |
| 2013-05-30 16:15 | eblake | Note Added: 0001630 | |
| 2013-05-30 16:16 | eblake | Note Edited: 0001630 | |
| 2013-05-30 16:32 | geoffclare | Note Added: 0001631 | |
| 2013-06-06 15:24 | geoffclare | Note Edited: 0001631 | |
| 2013-06-06 15:26 | geoffclare | Note Edited: 0001631 | |
| 2013-06-06 15:27 | geoffclare | Interp Status | => Pending |
| 2013-06-06 15:27 | geoffclare | Final Accepted Text | => 0000693:0001631 |
| 2013-06-06 15:27 | geoffclare | Status | New => Interpretation Required |
| 2013-06-06 15:27 | geoffclare | Resolution | Open => Accepted As Marked |
| 2013-06-06 15:28 | geoffclare | Tag Attached: tc2-2008 | |
| 2013-09-06 04:55 | ajosey | Interp Status | Pending => Proposed |
| 2013-09-06 04:55 | ajosey | Note Added: 0001810 | |
| 2013-10-14 13:06 | ajosey | Interp Status | Proposed => Approved |
| 2013-10-14 13:06 | ajosey | Note Added: 0001891 | |
| 2019-06-10 08:55 | agadmin | Status | Interpretation Required => Closed |
