[win] fix Error: CFI instruction used without previous .cfi_startproc

BUGLOG

@@ -0,0 +1,35 @@
+This file contains bugs we find while working on haskell.nix.  The format is as
+follow:
+<separator: 80 * '-'>
+YYYY-MM-DD: nix-job name
+
+<error>
+
+<discussion>
+
+--------------------------------------------------------------------------------
+2024-04-09 x86_64-linux.R2305.ghc8107.mingwW64.ghc
+
+/build/ghc62733_0/ghc_1.s:50:0: error:
+     Error: CFI instruction used without previous .cfi_startproc
+   |
+50 |         .cfi_escape 0x16, 0x07, 0x04, 0x77, 152, 65
+   | ^
+`x86_64-w64-mingw32-cc' failed in phase `Assembler'. (Exit code: 1)
+make[1]: *** [rts/ghc.mk:325: rts/dist/build/StgCRun.o] Error 1
+
+The source for this is
+> https://github.com/ghc/ghc/blob/1f02b7430b2fbab403d7ffdde9cfd006e884678e/rts/StgCRun.c#L433
+
+It appears that GCC C17 12.2.0 does _not_ emit .cfi_startproc / .cfi_endprocs
+whereas GCC C17 13.2.0 _does_. Specificall x86_64-w64-mingw32-cc. So this might
+be a cross compilation issue.
+
+The -g is hardcoded in
+https://github.com/ghc/ghc/blob/1f02b7430b2fbab403d7ffdde9cfd006e884678e/mk/config.mk.in#L361
+
+Turns out, this was disabled for anything but linux in https://github.com/ghc/ghc/commit/5b08e0c06e038448a63aa9bd7f163b23d824ba4b,
+hence we backport that patch to GHC-8.10 when targeting windows (to prevent mass rebuilds for
+other archs).
+
+--------------------------------------------------------------------------------

overlays/bootstrap.nix

@@ -253,6 +253,7 @@ in {
                 ++ final.lib.optional (versionAtLeast "8.10"   && versionLessThan "9.4" && final.stdenv.targetPlatform != final.stdenv.hostPlatform) ./patches/ghc/ghc-make-stage-1-lib-ghc.patch
                 ++ final.lib.optional (versionAtLeast "8.10"   && versionLessThan "9.0" && final.stdenv.targetPlatform.isAarch64) ./patches/ghc/ghc-8.10-better-symbol-addr-debug.patch
                 ++ final.lib.optional (versionAtLeast "8.10"   && versionLessThan "9.0" && final.stdenv.targetPlatform.isAarch64) ./patches/ghc/ghc-8.10-aarch64-handle-none-rela.patch
+                ++ final.lib.optional (versionAtLeast "8.10"   && versionLessThan "9.0" && final.stdenv.targetPlatform.isWindows) ./patches/ghc/5b08e0c06e038448a63aa9bd7f163b23d824ba4b.patch
                 ++ final.lib.optional (versionAtLeast "9.0"                             && final.stdenv.targetPlatform.isAarch64) ./patches/ghc/ghc-9.0-better-symbol-addr-debug.patch
                 ++ final.lib.optional (versionAtLeast "9.0"                             && final.stdenv.targetPlatform.isAarch64) ./patches/ghc/ghc-9.0-aarch64-handle-none-rela.patch
                 ++ final.lib.optional (versionAtLeast "9.6.3"  && versionLessThan "9.6.4" && final.stdenv.targetPlatform.isWindows) ./patches/ghc/ghc-9.6-hadrian-splitsections.patch

overlays/patches/ghc/5b08e0c06e038448a63aa9bd7f163b23d824ba4b.patch

@@ -0,0 +1,66 @@
+From 5b08e0c06e038448a63aa9bd7f163b23d824ba4b Mon Sep 17 00:00:00 2001
+From: Ben Gamari <[email protected]>
+Date: Mon, 3 Feb 2020 09:27:42 -0500
+Subject: [PATCH] StgCRun: Enable unwinding only on Linux
+
+It's broken on macOS due and SmartOS due to assembler differences
+(#15207) so let's be conservative in enabling it. Also, refactor things
+to make the intent clearer.
+---
+ rts/StgCRun.c | 15 +++++++++++----
+ 1 file changed, 11 insertions(+), 4 deletions(-)
+
+diff --git a/rts/StgCRun.c b/rts/StgCRun.c
+index 2600f1e569ca..55a3bf0c2d97 100644
+--- a/rts/StgCRun.c
++++ b/rts/StgCRun.c
+@@ -29,6 +29,13 @@
+ #include "PosixSource.h"
+ #include "ghcconfig.h"
+
++// Enable DWARF Call-Frame Information (used for stack unwinding) on Linux.
++// This is not supported on Darwin and SmartOS due to assembler differences
++// (#15207).
++#if defined(linux_HOST_OS)
++#define ENABLE_UNWINDING
++#endif
++
+ #if defined(sparc_HOST_ARCH) || defined(USE_MINIINTERPRETER)
+ /* include Stg.h first because we want real machine regs in here: we
+  * have to get the value of R1 back from Stg land to C land intact.
+@@ -405,7 +412,7 @@ StgRunIsImplementedInAssembler(void)
+         "movq %%xmm15,136(%%rax)\n\t"
+ #endif
+
+-#if !defined(darwin_HOST_OS)
++#if defined(ENABLE_UNWINDING)
+         /*
+          * Let the unwinder know where we saved the registers
+          * See Note [Unwinding foreign exports on x86-64].
+@@ -444,7 +451,7 @@ StgRunIsImplementedInAssembler(void)
+ #error "RSP_DELTA too big"
+ #endif
+           "\n\t"
+-#endif /* !defined(darwin_HOST_OS) */
++#endif /* defined(ENABLE_UNWINDING) */
+
+         /*
+          * Set BaseReg
+@@ -519,7 +526,7 @@ StgRunIsImplementedInAssembler(void)
+           "i"(RESERVED_C_STACK_BYTES + STG_RUN_STACK_FRAME_SIZE
+               /* rip relative to cfa */)
+
+-#if !defined(darwin_HOST_OS)
++#if defined(ENABLE_UNWINDING)
+           , "i"((RSP_DELTA & 127) | (128 * ((RSP_DELTA >> 7) > 0)))
+             /* signed LEB128-encoded delta from rsp - byte 1 */
+ #if (RSP_DELTA >> 7) > 0
+@@ -538,7 +545,7 @@ StgRunIsImplementedInAssembler(void)
+ #endif
+ #undef RSP_DELTA
+
+-#endif /* !defined(darwin_HOST_OS) */
++#endif /* defined(ENABLE_UNWINDING) */
+
+         );
+         /*