Re: Has scallywag problems with requirements ?

[Marco Atzeri via Cygwin-apps]

On 16.04.2023 03:32, Marco Atzeri wrote:

On 15.04.2023 20:31, Jon Turney wrote:


Also, if the configure script supports it, wouldn't it be better to 
set the PYTHON env var, or do --with-python=/usr/bin/python${v} than 
fiddling with alternatives?


the configure seems to not accept the

   --with-python=/usr/bin/python${v}

it continued to pick python3.9 also when I requested 3.8
I have however not checked the details of the configure.ac



for documentation this variant works

   --with-python PYTHON=/usr/bin/python${v}

just implemented in version -2 as I was re-enabling the FTP
protocol that was disabled by default upstream

Regards
Marco

[PATCH] peflags: add support for IMAGE_DLLCHARACTERISTICS_GUARD_CF

[Christoph Reiter via Cygwin-apps]

This allows for setting, clearing, and displaying the value of the
"control flow guard" dll characteristics flag.

For the option naming something like cfguard would probably be
easier to understand, but the MSVC flag is "/guard:cf" and the macro
contains GUARD_CF, so use "guard-cf" for consistency.

This is motivated by mingw-w64 and llvm v16 gaining support for
CFG (Control Flow Guard).
---
 peflags.c | 11 +--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/peflags.c b/peflags.c
index b1cd7a8..83ce48e 100644
--- a/peflags.c
+++ b/peflags.c
@@ -121,7 +121,7 @@ static const symbolic_flags_t pe_symbolic_flags[] = {
   CF(0x0800, no-bind),
 /*CF(0x1000, reserved_0x1000),*/
   CF(0x2000, wdmdriver),
-/*CF(0x4000, reserved_0x4000),*/
+  CF(0x4000, guard-cf),
   CF(0x8000, tsaware),
   {0, 0, 0}
 };
@@ -182,6 +182,7 @@ sizeof_values_t sizeof_vals[5] = {
 static struct option long_options[] = {
   {"dynamicbase",  optional_argument, NULL, 'd'},
   {"high-entropy-va", optional_argument, NULL, 'e'},
+  {"guard-cf", optional_argument, NULL, 'g'},
   {"forceinteg",   optional_argument, NULL, 'f'},
   {"nxcompat", optional_argument, NULL, 'n'},
   {"no-isolation", optional_argument, NULL, 'i'},
@@ -204,7 +205,7 @@ static struct option long_options[] = {
   {NULL, no_argument, NULL, 0}
 };
 static const char *short_options
-   = "d::e::f::n::i::s::b::W::t::w::l::S::x::X::y::Y::z::T:vhV";
+   = "d::e::g::f::n::i::s::b::W::t::w::l::S::x::X::y::Y::z::T:vhV";
 
 static void short_usage (FILE *f);
 static void help (FILE *f);
@@ -706,6 +707,11 @@ parse_args (int argc, char *argv[])
 optarg,
 IMAGE_DLLCHARACTERISTICS_HIGH_ENTROPY_VA);
  break;
+   case 'g':
+ handle_pe_flag_option (long_options[option_index].name,
+optarg,
+IMAGE_DLLCHARACTERISTICS_GUARD_CF);
+ break;
case 'n':
  handle_pe_flag_option (long_options[option_index].name,
 optarg,
@@ -1079,6 +1085,7 @@ help (FILE *f)
 "  -e,\n"
 "  --high-entropy-va  [BOOL]   Image is compatible with 64-bit address space\n"
 "  layout randomization (ASLR).\n"
+"  -g, --guard-cf [BOOL]   Image supports Control Flow Guard.\n"
 "  -f, --forceinteg   [BOOL]   Code integrity checks are enforced.\n"
 "  -n, --nxcompat [BOOL]   Image is compatible with data execution\n"
 "  prevention (DEP).\n"
-- 
2.40.0