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Diffstat (limited to 'doc/manual.cli')
| -rw-r--r-- | doc/manual.cli | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/doc/manual.cli b/doc/manual.cli index af9699e..3ee3016 100644 --- a/doc/manual.cli +++ b/doc/manual.cli @@ -5741,6 +5741,24 @@ if ($foo != [null]) cxx.poptions += \"-DUSE_FOO=$foo\" \ +Additionally, if invoking a program in an ad hoc recipe that either does not +provide the metadata or does not report the environment as part of it, then we +additionally should track the changes to the relevant environment variables +manually using the \c{depdb env} builtin. For example: + +\ +import! foo = foo%exe{foo} # Uses FOO and BAR environment variables. + +config.environment FOO BAR + +file{output}: file{input} $foo +{{ + diag foo $> + depdb env FOO BAR + $foo $path($<[0]) >$path($>) +}} +\ + \N|Normally, we would want to report variables that affect the build result rather than build byproducts (for example, diagnostics). This is, for example, the reason why locale-related environment variables are not saved by default. |