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cmd/cgo: mention character restrictions on #cgo lines 

Fixes #26025

Change-Id: I43b3c9019ca8d2844e4d664c2090e506b2171077
Reviewed-on: https://go-review.googlesource.com/120975
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Ian Lance Taylor 2018-06-26 06:40:26 -07:00
parent 97fa89497d
commit 5fad09016b
1 changed files with 5 additions and 0 deletions
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5
src/cmd/cgo/doc.go
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@ -64,6 +64,11 @@ a full argument: to allow -mfoo=bar, use CGO_CFLAGS_ALLOW='-mfoo.*',
not just CGO_CFLAGS_ALLOW='-mfoo'. Similarly named variables control
the allowed CPPFLAGS, CXXFLAGS, FFLAGS, and LDFLAGS.
Also for security reasons, only a limited set of characters are
permitted, notably alphanumeric characters and a few symbols, such as
'.', that will not be interpreted in unexpected ways. Attempts to use
forbidden characters will get a "malformed #cgo argument" error.
When building, the CGO_CFLAGS, CGO_CPPFLAGS, CGO_CXXFLAGS, CGO_FFLAGS and
CGO_LDFLAGS environment variables are added to the flags derived from
these directives. Package-specific flags should be set using the