Another option to prevent unwanted implicit dependencies.
Signed-off-by: Michael Olbrich <m.olbr...@pengutronix.de>
---
doc/ref_make_variables.rst | 8 ++++++++
rules/post/ptxd_make_world_common.make | 1 +
scripts/wrapper/libwrapper.sh | 6 ++++++
3 files changed, 15 insertions(+)
diff --git a/doc/ref_make_variables.rst b/doc/ref_make_variables.rst
index b770b1b49f18..674acdcea982 100644
--- a/doc/ref_make_variables.rst
+++ b/doc/ref_make_variables.rst
@@ -308,6 +308,14 @@ Build Environment for all Stages
flags. Adding them via environment variables or ``make`` arguments can
have unexpected side effects, such as as overwriting existing defaults.
+``<PKG>_FLAGS_BLACKLIST``
+ A list of arbitrary flags. If any one of these flags is found as an
+ argument to the compiler, preprocessor or linker then the call will fail.
+ This is useful to prevent implicit dependencies: Many packages try to
+ link to libraries at configure time and use them if it works. Adding
+ '-l<lib>' to the blacklist makes it possible to prevent such a detection
+ and explicitly avoid the dependency.
+
``<PKG>_WRAPPER_BLACKLIST``
PTXdist has several options in the platformconfig that inject options in
the compiler command line. This is used, for example, to add hardening
diff --git a/rules/post/ptxd_make_world_common.make
b/rules/post/ptxd_make_world_common.make
index 172f4c3296af..e5cf50214e9c 100644
--- a/rules/post/ptxd_make_world_common.make
+++ b/rules/post/ptxd_make_world_common.make
@@ -94,6 +94,7 @@ world/env/impl = \
pkg_build_dir="$(call ptx/escape,$($(1)_BUILD_DIR))"
\
\
pkg_wrapper_blacklist="$(call ptx/escape,$($(1)_WRAPPER_BLACKLIST))"
\
+ pkg_flags_blacklist="$(call ptx/escape,$($(1)_FLAGS_BLACKLIST))"
\
\
pkg_cppflags="$(call ptx/escape,$($(1)_CPPFLAGS))"
\
pkg_cflags="$(call ptx/escape,$($(1)_CFLAGS))"
\
diff --git a/scripts/wrapper/libwrapper.sh b/scripts/wrapper/libwrapper.sh
index 0a970638a859..a7cdbeac05dd 100644
--- a/scripts/wrapper/libwrapper.sh
+++ b/scripts/wrapper/libwrapper.sh
@@ -103,6 +103,12 @@ cc_check_args() {
COMPILING=true
;;
esac
+ case " ${pkg_flags_blacklist} " in
+ *" ${ARG} "*)
+ echo "wrapper: found blacklisted flag '${ARG}'"
>&2
+ exit 1
+ ;;
+ esac
done
# Used e.g. by the kernel to get the compiler version. Adding
# linker options confuses gcc because there is nothing to link.
--
2.29.2
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