unikernel/duniverse/dune_/test/blackbox-tests/test-cases/variables/var-cc.t/dune-project

@@ -0,0 +1 @@
+(lang dune 2.8)

unikernel/duniverse/dune_/test/blackbox-tests/test-cases/variables/var-cc.t/new_ff_handling/dune-project

@@ -0,0 +1,2 @@
+(lang dune 2.8)
+(use_standard_c_and_cxx_flags true)

unikernel/duniverse/dune_/test/blackbox-tests/test-cases/variables/var-cc.t/run.t

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+According to the doc: CC is the C compiler command line (list made of the
+compiler name followed by its flags) that was used to compile OCaml in the
+current build context.
+
+In practice, in dune < 2.8 it consists in the concatenation of OCaml's
+`c_compiler` and flags. Theses flags are made of the :standard set of flags
+merged with (and sometimes replaced by) the flags in the env stanza.
+
+  $ O_CC=$(ocamlc -config-var c_compiler)
+  $ O_CFLAGS=$(ocamlc -config-var ocamlc_cflags)
+  $ O_CPPFLAGS=$(ocamlc -config-var ocamlc_cppflags)
+  $ O_CC=$(echo $O_CC | sed -e 's/^[[:blank:]]*//')
+  $ O_CFLAGS=$(echo $O_CFLAGS | sed -e 's/^[[:blank:]]*//')
+  $ O_CPPFLAGS=$(echo $O_CPPFLAGS | sed -e 's/^[[:blank:]]*//')
+
+No env
+  $ cat > dune <<'EOF'
+  > (rule
+  >  (alias cc)
+  >   (action (echo %{cc})))
+  > EOF
+
+  $ dune build @cc | sed "s,${O_CC} ${O_CFLAGS},OK,"
+  OK
+
+With added env flags
+  $ cat >> dune <<'EOF'
+  > (env (_ (c_flags :standard -fPIC)))
+  > EOF
+
+  $ dune build @cc | sed "s,${O_CC} ${O_CFLAGS} -fPIC,OK,"
+  OK
+
+With redefining env flags
+  $ sed -i.bak "s/:standard //g" dune
+
+  $ dune build @cc | sed "s,${O_CC} -fPIC,OK,"
+  OK
+
+Since dune 2.8, when using the use_standard_c_and_cxx_flags option the :standard
+set of flag and thus the %{cc} variable contain both the cflags and cppflags
+from ocaml config. These flags are not added systematically anymore to the
+compiler command line.
+
+  $ cd new_ff_handling
+
+No env
+  $ cat > dune <<'EOF'
+  > (rule
+  >  (alias cc28)
+  >   (action (echo %{cc})))
+  > EOF
+
+  $ dune build @cc28 | sed "s,${O_CC} ${O_CFLAGS} ${O_CPPFLAGS} -Wall -fdiagnostics-color=always,OK,"
+  OK
+
+With added env flags
+  $ cat >> dune <<'EOF'
+  > (env (_ (c_flags :standard -fPIC)))
+  > EOF
+
+  $ dune build @cc28 | sed "s,${O_CC} ${O_CFLAGS} ${O_CPPFLAGS} -Wall -fdiagnostics-color=always -fPIC,OK,"
+  OK
+
+With redefining env flags
+  $ sed -i.bak "s/:standard //g" dune
+
+  $ dune build @cc28 | sed "s,${O_CC} -fPIC,OK,"
+  OK