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cmd/go: permit additional cflags when compiling

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In CL 475375 the Go command started to generate the "preferlinkext"
token file for "strange/dangerous" compiler flags. This serves as a hint
to the Go linker whether to call the external linker or not.

Permit compiler flags used by bazel and bazelbuild/rules_go during
compilation of cgo code to not prefer external linking. This restores
the behavior of previous versions of Go.

As a side effect, it also allows these flags to appear
in #cgo directives in source code. We don't know of any cases
where that is actually useful, but it appears to be harmless
and simplifies the implementation of the internal linking change.

Fixes #60865

Change-Id: I176a6a2a2cf36293dd9aed24be928f98fa2fb6d9
GitHub-Pull-Request: golang/go#60868
This commit is contained in:
Holger Hans Peter Freyther 2023-07-09 22:24:12 +08:00
parent 54f78cf8f1
commit 071e915b8e
2 changed files with 30 additions and 0 deletions
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4
src/cmd/go/internal/work/security.go
View File

@ -59,7 +59,10 @@ var validCompilerFlags = []*lazyregexp.Regexp{
re(`-f(no-)builtin-[a-zA-Z0-9_]*`),
re(`-f(no-)?common`),
re(`-f(no-)?constant-cfstrings`),
re(`-fdebug-prefix-map=([^@]+)=([^@]+)`),
re(`-fdiagnostics-show-note-include-stack`),
re(`-ffile-prefix-map=([^@]+)=([^@]+)`),
re(`-fno-canonical-system-headers`),
re(`-f(no-)?eliminate-unused-debug-types`),
re(`-f(no-)?exceptions`),
re(`-f(no-)?fast-math`),
@ -114,6 +117,7 @@ var validCompilerFlags = []*lazyregexp.Regexp{
re(`-mthumb(-interwork)?`),
re(`-mthreads`),
re(`-mwindows`),
re(`-no-canonical-prefixes`),
re(`--param=ssp-buffer-size=[0-9]*`),
re(`-pedantic(-errors)?`),
re(`-pipe`),

26
src/cmd/go/testdata/script/cgo_suspect_flag_force_external.txt vendored
View File

@ -55,6 +55,32 @@ stderr preferlinkext
env CGO_CFLAGS=-fprofile-instr-generate
go build -x -n -o dummy.exe ./usesInternalCgo
stderr preferlinkext
# The -fdebug-prefix-map=path is permitted for internal linking.
env CGO_CFLAGS=-fdebug-prefix-map=/some/sandbox/execroot/workspace=/tmp/new
go build -x -n -o dummy.exe ./usesInternalCgo
! stderr preferlinkext
env CGO_CFLAGS=-fdebug-prefix-map=/Users/someone/.cache/bazel/_bazel_someone/3fa7e4650c43657ead684537951f49e2/sandbox/linux-sandbox/10/execroot/rules_go_static=.
go build -x -n -o dummy.exe ./usesInternalCgo
! stderr preferlinkext
# The -ffile-prefix-map=path is permitted for internal linking too.
env CGO_CFLAGS=-ffile-prefix-map=/Users/someone/.cache/bazel/_bazel_someone/3fa7e4650c43657ead684537951f49e2/sandbox/linux-sandbox/10/execroot/rules_go_static/bazel-out/aarch64-fastbuild-ST-b33d65c724e6/bin/external/io_bazel_rules_go/stdlib_=.
go build -x -n -o dummy.exe ./usesInternalCgo
! stderr preferlinkext
# Verifying that -fdebug-prefix-map=path, -ffile-prefix-map, -no-canonical-prefixes
# and -fno-canonical-systemd-headers are permitted for internal linking.
env CGO_CFLAGS=-fdebug-prefix-map=old=/tmp/new
go build -x -n -o dummy.exe ./usesInternalCgo
! stderr preferlinkext
env CGO_CFLAGS=-ffile-prefix-map=/Users/someone/_11233/things=new
go build -x -n -o dummy.exe ./usesInternalCgo
! stderr preferlinkext
env CGO_CFLAGS=-no-canonical-prefixes
go build -x -n -o dummy.exe ./usesInternalCgo
! stderr preferlinkext
env CGO_CFLAGS=-fno-canonical-system-headers
go build -x -n -o dummy.exe ./usesInternalCgo
! stderr preferlinkext
env CGO_CFLAGS=
[short] skip