push sheeet

pkgs/development/compilers/gcc/patches/13/mangle-NIX_STORE-in-__FILE__.patch

@@ -0,0 +1,97 @@
+From e160a8cd4a704f4b7724df02b62394f677cc4198 Mon Sep 17 00:00:00 2001
+From: Sergei Trofimovich <siarheit@google.com>
+Date: Fri, 22 Sep 2023 22:41:49 +0100
+Subject: [PATCH] gcc/file-prefix-map.cc: always mangle __FILE__ into invalid
+ store path
+
+Without the change `__FILE__` used in static inline functions in headers
+embed paths to header files into executable images. For local headers
+it's not a problem, but for headers in `/nix/store` this causes `-dev`
+inputs to be retained in runtime closure.
+
+Typical examples are `nix` -> `nlohmann_json` and `pipewire` ->
+`lttng-ust.dev`.
+
+For this reason we want to remove the occurrences of hashes in the
+expansion of `__FILE__`. `nuke-references` does it by replacing hashes
+by `eeeeee...`. It is handy to be able to invert the transformation to
+go back to the original store path. The chosen solution is to make the
+hash uppercase:
+- it does not trigger runtime references (except for all digit hashes,
+  which are unlikely enough)
+- it visually looks like a bogus store path
+- it is easy to find the original store path if required
+
+Ideally we would like to use `-fmacro-prefix-map=` feature of `gcc` as:
+
+  -fmacro-prefix-map=/nix/store/$hash1-nlohmann-json-ver=/nix/store/$HASH1-nlohmann-json-ver
+  -fmacro-prefix-map=/nix/...
+
+In practice it quickly exhausts argument length limit due to `gcc`
+deficiency: https://gcc.gnu.org/PR111527
+
+Until it's fixed let's hardcode header mangling if $NIX_STORE variable
+is present in the environment.
+
+Tested as:
+
+    $ printf "# 0 \"/nix/store/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa-pppppp-vvvvvvv\" \nconst char * f(void) { return __FILE__; }" | NIX_STORE=/nix/store ./gcc/xgcc -Bgcc -x c - -S -o -
+    ...
+    .string "/nix/store/AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA-pppppp-vvvvvvv"
+    ...
+
+Mangled successfully.
+
+To reverse the effect of the mangle use new `NIX_GCC_DONT_MANGLE_PREFIX_MAP`
+environment variable. It should not normally be needed.
+--- a/gcc/file-prefix-map.cc
++++ b/gcc/file-prefix-map.cc
+@@ -74,7 +74,7 @@ add_prefix_map (file_prefix_map *&maps, const char *arg, const char *opt)
+    remapping was performed.  */
+ 
+ static const char *
+-remap_filename (file_prefix_map *maps, const char *filename)
++remap_filename (file_prefix_map *maps, const char *filename, bool mangle_nix_store = false)
+ {
+   file_prefix_map *map;
+   char *s;
+@@ -102,6 +102,30 @@ remap_filename (file_prefix_map *maps, const char *filename)
+       break;
+   if (!map)
+     {
++      if (mangle_nix_store && getenv("NIX_GCC_DONT_MANGLE_PREFIX_MAP") == NULL)
++	{
++	  /* Remap all fo $NIX_STORE/.{32} paths to uppercase
++	   *
++	   * That way we avoid argument parameters explosion
++	   * and still avoid embedding headers into runtime closure:
++	   *   https://gcc.gnu.org/PR111527
++	   */
++	   char * nix_store = getenv("NIX_STORE");
++	   size_t nix_store_len = nix_store ? strlen(nix_store) : 0;
++	   const char * name = realname ? realname : filename;
++	   size_t name_len = strlen(name);
++	   if (nix_store && name_len >= nix_store_len + 1 + 32 && memcmp(name, nix_store, nix_store_len) == 0)
++	     {
++		s = (char *) ggc_alloc_atomic (name_len + 1);
++		memcpy(s, name, name_len + 1);
++		for (size_t i = nix_store_len + 1; i < nix_store_len + 1 + 32; i++) {
++		  s[i] = TOUPPER(s[i]);
++		}
++		if (realname != filename)
++		  free (const_cast <char *> (realname));
++		return s;
++	     }
++	}
+       if (realname != filename)
+ 	free (const_cast <char *> (realname));
+       return filename;
+@@ -163,7 +187,7 @@ add_profile_prefix_map (const char *arg)
+ const char *
+ remap_macro_filename (const char *filename)
+ {
+-  return remap_filename (macro_prefix_maps, filename);
++  return remap_filename (macro_prefix_maps, filename, true);
+ }
+ 
+ /* Remap using -fdebug-prefix-map.  Return the GC-allocated new name

pkgs/development/compilers/gcc/patches/13/no-sys-dirs-riscv.patch

@@ -0,0 +1,13 @@
+--- a/gcc/config/riscv/linux.h
++++ b/gcc/config/riscv/linux.h
+@@ -69,9 +69,5 @@
+ 
+ #define TARGET_ASM_FILE_END file_end_indicate_exec_stack
+ 
+-#define STARTFILE_PREFIX_SPEC 			\
+-   "/lib" XLEN_SPEC "/" ABI_SPEC "/ "		\
+-   "/usr/lib" XLEN_SPEC "/" ABI_SPEC "/ "	\
+-   "/lib/ "					\
+-   "/usr/lib/ "
++#define STARTFILE_PREFIX_SPEC ""
+ 

pkgs/development/compilers/gcc/patches/14/gcc-darwin-remove-coreservices.patch

@@ -0,0 +1,39 @@
+diff --git a/config/intlmacosx.m4 b/config/intlmacosx.m4
+index 3141bf8c5..7a31862b9 100644
+--- a/config/intlmacosx.m4
++++ b/config/intlmacosx.m4
+@@ -63,7 +63,7 @@ AC_DEFUN([gt_INTL_MACOSX],
+     dnl and we have to link it in explicitly, otherwise an exception
+     dnl NSInvalidArgumentException "unrecognized selector sent to instance"
+     dnl occurs.
+-    INTL_MACOSX_LIBS="-Wl,-framework -Wl,CoreFoundation -Wl,-framework -Wl,CoreServices"
++    INTL_MACOSX_LIBS="-Wl,-framework -Wl,CoreFoundation"
+   fi
+   AC_SUBST([INTL_MACOSX_LIBS])
+ ])
+diff --git a/gcc/configure b/gcc/configure
+index 23da7d55d..8bd09364d 100755
+--- a/gcc/configure
++++ b/gcc/configure
+@@ -13932,7 +13932,7 @@ $as_echo "#define HAVE_CFLOCALECOPYPREFERREDLANGUAGES 1" >>confdefs.h
+   INTL_MACOSX_LIBS=
+   if test $gt_cv_func_CFPreferencesCopyAppValue = yes \
+      || test $gt_cv_func_CFLocaleCopyPreferredLanguages = yes; then
+-                    INTL_MACOSX_LIBS="-Wl,-framework -Wl,CoreFoundation -Wl,-framework -Wl,CoreServices"
++                    INTL_MACOSX_LIBS="-Wl,-framework -Wl,CoreFoundation"
+   fi
+ 
+ 
+diff --git a/libcpp/configure b/libcpp/configure
+index 32d6aaa30..592c33881 100755
+--- a/libcpp/configure
++++ b/libcpp/configure
+@@ -7570,7 +7570,7 @@ $as_echo "#define HAVE_CFLOCALECOPYPREFERREDLANGUAGES 1" >>confdefs.h
+   INTL_MACOSX_LIBS=
+   if test $gt_cv_func_CFPreferencesCopyAppValue = yes \
+      || test $gt_cv_func_CFLocaleCopyPreferredLanguages = yes; then
+-                    INTL_MACOSX_LIBS="-Wl,-framework -Wl,CoreFoundation -Wl,-framework -Wl,CoreServices"
++                    INTL_MACOSX_LIBS="-Wl,-framework -Wl,CoreFoundation"
+   fi
+ 
+ 

pkgs/development/compilers/gcc/patches/14/gnat-darwin-dylib-install-name-14.patch

@@ -0,0 +1,21 @@
+diff --git a/gcc/ada/gcc-interface/Makefile.in b/gcc/ada/gcc-interface/Makefile.in
+index 0666fc00b..0e2d53eb8 100644
+--- a/gcc/ada/gcc-interface/Makefile.in
++++ b/gcc/ada/gcc-interface/Makefile.in
+@@ -793,14 +793,14 @@ gnatlib-shared-darwin:
+ 		-o libgnat$(hyphen)$(LIBRARY_VERSION)$(soext) \
+ 		$(GNATRTL_NONTASKING_OBJS) $(LIBGNAT_OBJS) \
+ 		$(SO_OPTS) \
+-		-Wl,-install_name,@rpath/libgnat$(hyphen)$(LIBRARY_VERSION)$(soext) \
++		-Wl,-install_name,$(ADA_RTL_DSO_DIR)/libgnat$(hyphen)$(LIBRARY_VERSION)$(soext) \
+ 		-nodefaultrpaths -Wl,-rpath,@loader_path/,-rpath,@loader_path/.. \
+ 		-Wl,-rpath,@loader_path/../../../../ $(MISCLIB)
+ 	cd $(RTSDIR); $(GCC_FOR_ADA_RTS) -dynamiclib $(PICFLAG_FOR_TARGET) \
+ 		-o libgnarl$(hyphen)$(LIBRARY_VERSION)$(soext) \
+ 		$(GNATRTL_TASKING_OBJS) \
+ 		$(SO_OPTS) \
+-		-Wl,-install_name,@rpath/libgnarl$(hyphen)$(LIBRARY_VERSION)$(soext) \
++		-Wl,-install_name,$(ADA_RTL_DSO_DIR)/libgnarl$(hyphen)$(LIBRARY_VERSION)$(soext) \
+ 		-nodefaultrpaths -Wl,-rpath,@loader_path/,-rpath,@loader_path/.. \
+ 		-Wl,-rpath,@loader_path/../../../../ \
+ 		$(THREADSLIB) -Wl,libgnat$(hyphen)$(LIBRARY_VERSION)$(soext)

pkgs/development/compilers/gcc/patches/14/libgcc-darwin-detection.patch

@@ -0,0 +1,13 @@
+diff --git a/libgcc/config.host b/libgcc/config.host
+index 7332903704..27a8b5bedb 100644
+--- a/libgcc/config.host
++++ b/libgcc/config.host
+@@ -236,7 +236,7 @@
+   esac
+   tmake_file="$tmake_file t-slibgcc-darwin"
+   case ${host} in
+-    *-*-darwin2*)
++    *-*-darwin2* | *-*-darwin)
+       tmake_file="t-darwin-min-11 $tmake_file"
+       ;;
+     *-*-darwin1[89]*)

pkgs/development/compilers/gcc/patches/15/libgcc-darwin-detection.patch

@@ -0,0 +1,11 @@
+--- a/libgcc/config.host
++++ b/libgcc/config.host
+@@ -239,7 +239,7 @@ case ${host} in
+     x86_64-*-darwin2[0-2]*)
+       tmake_file="t-darwin-min-11 t-darwin-libgccs1 $tmake_file"
+       ;;
+-    *-*-darwin2*)
++    *-*-darwin2* | *-*-darwin)
+       tmake_file="t-darwin-min-11 $tmake_file"
+       ;;
+     *-*-darwin1[89]*)

pkgs/development/compilers/gcc/patches/ada-cctools-as-detection-configure.patch

@@ -0,0 +1,33 @@
+As originally implemented, the error message check
+described in the configure script
+breaks detection of Ada compiler support on x86_64-darwin,
+because the assembler in the version of cctools currently used
+unconditionally emits a deprecation message to stdout,
+with no way to disable it.
+
+Furthermore, GCC 3.4 was the minimum version needed to build GNAT
+as far back as GCC 4.4 (see the GCC git repo, tags/releases/gcc-4.4.0,
+gcc/doc/install.texi, lines 2052-2053 [1]);
+GCC 3.4 is newer than any of the broken GCC versions
+that the configure script works around
+(see the part of the comment in the configure script
+before the context in the patch below),
+and GCC 4.4 is older than any GCC that Nix currently packages (GCC 4.8).
+
+We therefore choose to not check for error messages,
+and just check for an error code.
+There's no harm in still checking for an object file being created, though.
+
+[1]: https://gcc.gnu.org/git/?p=gcc.git;a=blob;f=gcc/doc/install.texi;h=6bdfbece981f7fb6c26da672d45e5d3ba7879c69;hb=b7fc996728085c0591ea7c5d0e1c84a8f6a29bd8#l2052
+--- a/configure        2022-08-19 18:09:52.000000000 +1000
++++ b/configure        2022-12-26 17:30:49.000000000 +1100
+@@ -5622,8 +5622,7 @@
+ # Other compilers, like HP Tru64 UNIX cc, exit successfully when
+ # given a .adb file, but produce no object file.  So we must check
+ # if an object file was really produced to guard against this.
+-errors=`(${CC} -c conftest.adb) 2>&1 || echo failure`
+-if test x"$errors" = x && test -f conftest.$ac_objext; then
++if ${CC} -c conftest.adb && test -f conftest.$ac_objext; then
+   acx_cv_cc_gcc_supports_ada=yes
+ fi
+ rm -f conftest.*

pkgs/development/compilers/gcc/patches/cfi_startproc-reorder-label-09-1.diff

@@ -0,0 +1,16 @@
+this patch fixes build for clang-18+
+
+diff --git a/libgcc/config/aarch64/lse.S b/libgcc/config/aarch64/lse.S
+index d3235bc33..1a56eb61c 100644
+--- a/libgcc/config/aarch64/lse.S
++++ b/libgcc/config/aarch64/lse.S
+@@ -170,8 +170,8 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+ 	.globl	\name
+ 	.hidden	\name
+ 	.type	\name, %function
+-	.cfi_startproc
+ \name:
++	.cfi_startproc
+ 	BTI_C
+ .endm
+ 

pkgs/development/compilers/gcc/patches/cfi_startproc-reorder-label-14-1.diff

@@ -0,0 +1,16 @@
+this patch fixes build for clang-18+
+
+diff --git a/libgcc/config/aarch64/lse.S b/libgcc/config/aarch64/lse.S
+index ecef47086..b478dd4d9 100644
+--- a/libgcc/config/aarch64/lse.S
++++ b/libgcc/config/aarch64/lse.S
+@@ -174,8 +174,8 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+ 	.globl	\name
+ 	HIDDEN(\name)
+ 	SYMBOL_TYPE(\name, %function)
+-	.cfi_startproc
+ \name:
++	.cfi_startproc
+ .endm
+ 
+ .macro	ENDFN name

pkgs/development/compilers/gcc/patches/cfi_startproc-reorder-label-2.diff

@@ -0,0 +1,16 @@
+this patch fixes build for clang-18+
+
+diff --git a/libgcc/config/aarch64/lse.S b/libgcc/config/aarch64/lse.S
+index d3235bc33..1a56eb61c 100644
+--- a/libgcc/config/aarch64/lse.S
++++ b/libgcc/config/aarch64/lse.S
+@@ -197,8 +197,8 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+ 	.text
+ 	.balign	16
+ 	.private_extern	_\name
+-	.cfi_startproc
+ _\name:
++	.cfi_startproc
+ 	BTI_C
+ .endm
+ 

pkgs/development/compilers/gcc/patches/default.nix

@@ -0,0 +1,240 @@
+{
+  lib,
+  stdenv,
+  langC,
+  langAda,
+  langObjC,
+  langObjCpp,
+  langFortran,
+  langGo,
+  reproducibleBuild,
+  profiledCompiler,
+  langJit,
+  staticCompiler,
+  enableShared,
+  enableLTO,
+  version,
+  fetchpatch,
+  majorVersion,
+  targetPlatform,
+  hostPlatform,
+  noSysDirs,
+  buildPlatform,
+  fetchurl,
+  withoutTargetLibc,
+  threadsCross,
+}:
+
+let
+  atLeast15 = lib.versionAtLeast version "15";
+  atLeast14 = lib.versionAtLeast version "14";
+  is15 = majorVersion == "15";
+  is14 = majorVersion == "14";
+  is13 = majorVersion == "13";
+
+  # We only apply these patches when building a native toolchain for
+  # aarch64-darwin, as it breaks building a foreign one:
+  # https://github.com/iains/gcc-12-branch/issues/18
+  canApplyIainsDarwinPatches =
+    stdenv.hostPlatform.isDarwin
+    && stdenv.hostPlatform.isAarch64
+    && (lib.systems.equals buildPlatform hostPlatform)
+    && (lib.systems.equals hostPlatform targetPlatform);
+
+  inherit (lib) optionals optional;
+in
+
+#
+#  Patches below are organized into two general categories:
+#  1. Patches relevant on every platform
+#  2. Patches relevant on specific platforms
+#
+
+## 1. Patches relevant on every platform ####################################
+
+[ ]
+# Pass the path to a C++ compiler directly in the Makefile.in
+++ optional (!lib.systems.equals targetPlatform hostPlatform) ./libstdc++-target.patch
+++ optionals noSysDirs (
+  [
+    # Do not try looking for binaries and libraries in /lib and /usr/lib
+    ./gcc-12-no-sys-dirs.patch
+  ]
+  ++ (
+    {
+      "15" = [
+        # Do not try looking for binaries and libraries in /lib and /usr/lib
+        ./13/no-sys-dirs-riscv.patch
+        # Mangle the nix store hash in __FILE__ to prevent unneeded runtime references
+        #
+        # TODO: Remove these and the `useMacroPrefixMap` conditional
+        # in `cc-wrapper` once <https://gcc.gnu.org/PR111527>
+        # is fixed.
+        ./13/mangle-NIX_STORE-in-__FILE__.patch
+      ];
+      "14" = [
+        ./13/no-sys-dirs-riscv.patch
+        ./13/mangle-NIX_STORE-in-__FILE__.patch
+      ];
+      "13" = [
+        ./13/no-sys-dirs-riscv.patch
+        ./13/mangle-NIX_STORE-in-__FILE__.patch
+      ];
+    }
+    ."${majorVersion}" or [ ]
+  )
+)
+# Pass CFLAGS on to gnat
+++ optional langAda ./gnat-cflags-11.patch
+++
+  optional langFortran
+    # Fix interaction of gfortran and libtool
+    # Fixes the output of -v
+    # See also https://github.com/nixOS/nixpkgs/commit/cc6f814a8f0e9b70ede5b24192558664fa1f98a2
+    ./gcc-12-gfortran-driving.patch
+# Do not pass a default include dir on PowerPC+Musl
+# See https://github.com/NixOS/nixpkgs/pull/45340/commits/d6bb7d45162ac93e017cc9b665ae4836f6410710
+++ [ ./ppc-musl.patch ]
+# Moves the .cfi_starproc instruction to after the function label
+# Needed to build llvm-18 and later
+# See https://github.com/NixOS/nixpkgs/pull/354107/commits/2de1b4b14e17f42ba8b4bf43a29347c91511e008
+++ optional (!atLeast14) ./cfi_startproc-reorder-label-09-1.diff
+++ optional (atLeast14 && !canApplyIainsDarwinPatches) ./cfi_startproc-reorder-label-14-1.diff
+
+## 2. Patches relevant on specific platforms ####################################
+
+### Musl+Go+gcc12
+
+# backport fixes to build gccgo with musl libc
+++ optionals (stdenv.hostPlatform.isMusl && langGo) [
+  # libgo: handle stat st_atim32 field and SYS_SECCOMP
+  # syscall: gofmt
+  # Add blank lines after //sys comments where needed, and then run gofmt
+  # on the syscall package with the new formatter.
+  # See https://go-review.googlesource.com/c/gofrontend/+/412074
+  (fetchpatch {
+    excludes = [ "gcc/go/gofrontend/MERGE" ];
+    url = "https://github.com/gcc-mirror/gcc/commit/cf79b1117bd177d3d4c6ed24b6fa243c3628ac2d.diff";
+    hash = "sha256-mS5ZiYi5D8CpGXrWg3tXlbhp4o86ew1imCTwaHLfl+I=";
+  })
+  # libgo: permit loff_t and off_t to be macros
+  # See https://go-review.googlesource.com/c/gofrontend/+/412075
+  (fetchpatch {
+    excludes = [ "gcc/go/gofrontend/MERGE" ];
+    url = "https://github.com/gcc-mirror/gcc/commit/7f195a2270910a6ed08bd76e3a16b0a6503f9faf.diff";
+    hash = "sha256-Ze/cFM0dQofKH00PWPDoklXUlwWhwA1nyTuiDAZ6FKo=";
+  })
+  # libgo: handle stat st_atim32 field and SYS_SECCOMP
+  # See https://go-review.googlesource.com/c/gofrontend/+/415294
+  (fetchpatch {
+    excludes = [ "gcc/go/gofrontend/MERGE" ];
+    url = "https://github.com/gcc-mirror/gcc/commit/762fd5e5547e464e25b4bee435db6df4eda0de90.diff";
+    hash = "sha256-o28upwTcHAnHG2Iq0OewzwSBEhHs+XpBGdIfZdT81pk=";
+  })
+  # runtime: portable access to sigev_notify_thread_id
+  # See https://sourceware.org/bugzilla/show_bug.cgi?id=27417
+  # See https://go-review.googlesource.com/c/gofrontend/+/434755
+  (fetchpatch {
+    excludes = [ "gcc/go/gofrontend/MERGE" ];
+    url = "https://github.com/gcc-mirror/gcc/commit/e73d9fcafbd07bc3714fbaf8a82db71d50015c92.diff";
+    hash = "sha256-1SjYCVHLEUihdON2TOC3Z2ufM+jf2vH0LvYtZL+c1Fo=";
+  })
+  # syscall, runtime: always call XSI strerror_r
+  # See https://go-review.googlesource.com/c/gofrontend/+/454176
+  (fetchpatch {
+    excludes = [ "gcc/go/gofrontend/MERGE" ];
+    url = "https://github.com/gcc-mirror/gcc/commit/b6c6a3d64f2e4e9347733290aca3c75898c44b2e.diff";
+    hash = "sha256-RycJ3YCHd3MXtYFjxP0zY2Wuw7/C4bWoBAQtTKJZPOQ=";
+  })
+  # libgo: check for makecontext in -lucontext
+  # See https://go-review.googlesource.com/c/gofrontend/+/458396
+  (fetchpatch {
+    excludes = [ "gcc/go/gofrontend/MERGE" ];
+    url = "https://github.com/gcc-mirror/gcc/commit/2b1a604a9b28fbf4f382060bebd04adb83acc2f9.diff";
+    hash = "sha256-WiBQG0Xbk75rHk+AMDvsbrm+dc7lDH0EONJXSdEeMGE=";
+  })
+  # x86: Fix -fsplit-stack feature detection via  TARGET_CAN_SPLIT_STACK
+  # Fixes compiling for non-glibc target
+  (fetchpatch {
+    url = "https://github.com/gcc-mirror/gcc/commit/c86b726c048eddc1be320c0bf64a897658bee13d.diff";
+    hash = "sha256-QSIlqDB6JRQhbj/c3ejlmbfWz9l9FurdSWxpwDebnlI=";
+  })
+]
+
+## Darwin
+
+# Fixes detection of Darwin on x86_64-darwin. Otherwise, GCC uses a deployment target of 10.5, which crashes ld64.
+++ optional (
+  is14 && stdenv.hostPlatform.isDarwin && stdenv.hostPlatform.isx86_64
+) ../patches/14/libgcc-darwin-detection.patch
+++ optional (
+  atLeast15 && stdenv.hostPlatform.isDarwin && stdenv.hostPlatform.isx86_64
+) ../patches/15/libgcc-darwin-detection.patch
+
+# Fix detection of bootstrap compiler Ada support (cctools as) on Nix Darwin
+++ optional (stdenv.hostPlatform.isDarwin && langAda) ./ada-cctools-as-detection-configure.patch
+
+# Remove CoreServices on Darwin, as it is only needed for macOS SDK 14+
+++ optional (
+  atLeast14 && stdenv.hostPlatform.isDarwin && langAda
+) ../patches/14/gcc-darwin-remove-coreservices.patch
+
+# Use absolute path in GNAT dylib install names on Darwin
+++ optionals (stdenv.hostPlatform.isDarwin && langAda) (
+  {
+    "15" = [ ../patches/14/gnat-darwin-dylib-install-name-14.patch ];
+    "14" = [ ../patches/14/gnat-darwin-dylib-install-name-14.patch ];
+    "13" = [ ./gnat-darwin-dylib-install-name-13.patch ];
+  }
+  .${majorVersion} or [ ]
+)
+
+# Here we apply patches by Iains (https://github.com/iains)
+# GitHub's "compare" API produces unstable diffs, so we resort to reusing
+# diffs from the Homebrew repo.
+++ optionals canApplyIainsDarwinPatches (
+  {
+    "15" = [
+      # Patches from https://github.com/iains/gcc-15-branch/compare/releases/gcc-15..gcc-15.1-darwin-rc1
+      (fetchpatch {
+        name = "gcc-15-darwin-aarch64-support.patch";
+        url = "https://raw.githubusercontent.com/Homebrew/formula-patches/a25079204c1cb3d78ba9dd7dd22b8aecce7ce264/gcc/gcc-15.1.0.diff";
+        sha256 = "sha256-MJxSGv6LEP1sIM8cDqbmfUV7byV0bYgADeIBY/Teyu8=";
+      })
+    ];
+    "14" = [
+      # Patches from https://github.com/iains/gcc-14-branch/compare/04696df09633baf97cdbbdd6e9929b9d472161d3..gcc-14.2-darwin-r2
+      (fetchpatch {
+        # There are no upstream release tags nor a static branch for 14.3.0 in https://github.com/iains/gcc-14-branch.
+        # aa4cd614456de65ee3417acb83c6cff0640144e9 is the merge base of https://github.com/iains/gcc-14-branch/tree/gcc-14-3-darwin-pre-0 and https://github.com/gcc-mirror/gcc/releases/tag/releases%2Fgcc-14.3.0
+        # 3e1d48d240f4aa5223c701b5c231c66f66ab1126 is the newest commit of https://github.com/iains/gcc-14-branch/tree/gcc-14-3-darwin-pre-0
+        name = "gcc-14-darwin-aarch64-support.patch";
+        url = "https://github.com/iains/gcc-14-branch/compare/aa4cd614456de65ee3417acb83c6cff0640144e9..3e1d48d240f4aa5223c701b5c231c66f66ab1126.diff";
+        hash = "sha256-BSTSYnkBJBEm++mGerVVyaCUC4dUyXq0N1tqbk25bO4=";
+      })
+    ];
+    # Patches from https://github.com/iains/gcc-13-branch/compare/b71f1de6e9cf7181a288c0f39f9b1ef6580cf5c8..gcc-13-3-darwin
+    "13" = [
+      (fetchpatch {
+        name = "gcc-13-darwin-aarch64-support.patch";
+        url = "https://raw.githubusercontent.com/Homebrew/formula-patches/698885df7f624d0ce15bceb79a4d9760a473b502/gcc/gcc-13.4.0.diff";
+        hash = "sha256-xqkBDFYZ6fdowtqR3kV7bR8a4Cu11RDokSzGn1k3a1w=";
+      })
+    ];
+  }
+  .${majorVersion} or [ ]
+)
+
+++ optional targetPlatform.isCygwin (fetchpatch {
+  name = "libstdc-fix-compilation-in-freestanding-win32.patch";
+  url = "https://inbox.sourceware.org/gcc-patches/20250922182808.2599390-2-corngood@gmail.com/raw";
+  hash = "sha256-+EYW9lG8CviVX7RyNHp+iX+8BRHUjt5b07k940khbbY=";
+})
+
+++ optionals targetPlatform.isCygwin [
+  (fetchpatch {
+    name = "cygwin-fix-compilation-with-inhibit_libc.patch";
+    url = "https://inbox.sourceware.org/gcc-patches/20250926170154.2222977-1-corngood@gmail.com/raw";
+    hash = "sha256-mgzMRvgPdhj+Q2VRsFhpE2WQzg0CvWsc5/FRAsSU1Es=";
+  })
+]

pkgs/development/compilers/gcc/patches/gcc-12-gfortran-driving.patch

@@ -0,0 +1,20 @@
+This patch fixes interaction with Libtool.
+See <http://thread.gmane.org/gmane.comp.gcc.patches/258777>, for details.
+
+--- a/gcc/fortran/gfortranspec.cc
++++ b/gcc/fortran/gfortranspec.cc
+@@ -461,8 +461,15 @@ For more information about these matters, see the file named COPYING\n\n"));
+     {
+       fprintf (stderr, _("Driving:"));
+       for (i = 0; i < g77_newargc; i++)
++	{
++	  if (g77_new_decoded_options[i].opt_index == OPT_l)
++	    /* Make sure no white space is inserted after `-l'.  */
++	    fprintf (stderr, " -l%s",
++		     g77_new_decoded_options[i].canonical_option[1]);
++	  else
+ 	fprintf (stderr, " %s",
+ 		 g77_new_decoded_options[i].orig_option_with_args_text);
++	}
+       fprintf (stderr, "\n");
+     }

pkgs/development/compilers/gcc/patches/gcc-12-no-sys-dirs.patch

@@ -0,0 +1,26 @@
+--- a/gcc/cppdefault.cc	2013-01-10 21:38:27.000000000 +0100
++++ b/gcc/cppdefault.cc	2014-08-18 16:20:32.893944536 +0200
+@@ -35,6 +35,8 @@
+ # undef CROSS_INCLUDE_DIR
+ #endif
+ 
++#undef LOCAL_INCLUDE_DIR
++
+ const struct default_include cpp_include_defaults[]
+ #ifdef INCLUDE_DEFAULTS
+ = INCLUDE_DEFAULTS;
+--- a/gcc/gcc.cc	2014-03-23 12:30:57.000000000 +0100
++++ b/gcc/gcc.cc	2014-08-18 13:19:32.689201690 +0200
+@@ -1162,10 +1162,10 @@
+ /* Default prefixes to attach to command names.  */
+ 
+ #ifndef STANDARD_STARTFILE_PREFIX_1
+-#define STANDARD_STARTFILE_PREFIX_1 "/lib/"
++#define STANDARD_STARTFILE_PREFIX_1 ""
+ #endif
+ #ifndef STANDARD_STARTFILE_PREFIX_2
+-#define STANDARD_STARTFILE_PREFIX_2 "/usr/lib/"
++#define STANDARD_STARTFILE_PREFIX_2 ""
+ #endif
+ 
+ #ifdef CROSS_DIRECTORY_STRUCTURE  /* Don't use these prefixes for a cross compiler.  */

pkgs/development/compilers/gcc/patches/gnat-cflags-11.patch

@@ -0,0 +1,35 @@
+diff --git a/gcc/ada/gcc-interface/Makefile.in b/gcc/ada/gcc-interface/Makefile.in
+index 4e74252bd74..0d848b5b4e3 100644
+--- a/gcc/ada/gcc-interface/Makefile.in
++++ b/gcc/ada/gcc-interface/Makefile.in
+@@ -111,7 +111,7 @@ NO_OMIT_ADAFLAGS = -fno-omit-frame-pointer
+ NO_SIBLING_ADAFLAGS = -fno-optimize-sibling-calls
+ NO_REORDER_ADAFLAGS = -fno-toplevel-reorder
+ GNATLIBFLAGS = -W -Wall -gnatg -nostdinc
+-GNATLIBCFLAGS = -g -O2
++GNATLIBCFLAGS = -g -O2 $(CFLAGS_FOR_TARGET)
+ # Pretend that _Unwind_GetIPInfo is available for the target by default.  This
+ # should be autodetected during the configuration of libada and passed down to
+ # here, but we need something for --disable-libada and hope for the best.
+@@ -198,7 +198,7 @@ RTSDIR = rts$(subst /,_,$(MULTISUBDIR))
+ # Link flags used to build gnat tools.  By default we prefer to statically
+ # link with libgcc to avoid a dependency on shared libgcc (which is tricky
+ # to deal with as it may conflict with the libgcc provided by the system).
+-GCC_LINK_FLAGS=-static-libstdc++ -static-libgcc
++GCC_LINK_FLAGS=-static-libstdc++ -static-libgcc $(CFLAGS_FOR_TARGET)
+
+ # End of variables for you to override.
+
+diff --git a/libada/Makefile.in b/libada/Makefile.in
+index 522b9207326..ca866c74471 100644
+--- a/libada/Makefile.in
++++ b/libada/Makefile.in
+@@ -59,7 +59,7 @@ LDFLAGS=
+ CFLAGS=-g
+ PICFLAG = @PICFLAG@
+ GNATLIBFLAGS= -W -Wall -gnatpg -nostdinc
+-GNATLIBCFLAGS= -g -O2
++GNATLIBCFLAGS= -g -O2 $(CFLAGS)
+ GNATLIBCFLAGS_FOR_C = -W -Wall $(GNATLIBCFLAGS) $(CFLAGS_FOR_TARGET) \
+        -fexceptions -DIN_RTS @have_getipinfo@ @have_capability@
+

pkgs/development/compilers/gcc/patches/gnat-darwin-dylib-install-name-13.patch

@@ -0,0 +1,18 @@
+--- a/gcc/ada/gcc-interface/Makefile.in
++++ b/gcc/ada/gcc-interface/Makefile.in
+@@ -788,13 +788,13 @@ gnatlib-shared-darwin:
+ 		-o libgnat$(hyphen)$(LIBRARY_VERSION)$(soext) \
+ 		$(GNATRTL_NONTASKING_OBJS) $(LIBGNAT_OBJS) \
+ 		$(SO_OPTS) \
+-		-Wl,-install_name,@rpath/libgnat$(hyphen)$(LIBRARY_VERSION)$(soext) \
++		-Wl,-install_name,$(ADA_RTL_DSO_DIR)/libgnat$(hyphen)$(LIBRARY_VERSION)$(soext) \
+ 		$(MISCLIB)
+ 	cd $(RTSDIR); $(GCC_FOR_ADA_RTS) -dynamiclib $(PICFLAG_FOR_TARGET) \
+ 		-o libgnarl$(hyphen)$(LIBRARY_VERSION)$(soext) \
+ 		$(GNATRTL_TASKING_OBJS) \
+ 		$(SO_OPTS) \
+-		-Wl,-install_name,@rpath/libgnarl$(hyphen)$(LIBRARY_VERSION)$(soext) \
++		-Wl,-install_name,$(ADA_RTL_DSO_DIR)/libgnarl$(hyphen)$(LIBRARY_VERSION)$(soext) \
+ 		$(THREADSLIB) -Wl,libgnat$(hyphen)$(LIBRARY_VERSION)$(soext)
+ 	cd $(RTSDIR); $(LN_S) libgnat$(hyphen)$(LIBRARY_VERSION)$(soext) \
+ 		libgnat$(soext)

pkgs/development/compilers/gcc/patches/libstdc++-target.patch

@@ -0,0 +1,32 @@
+Patch to make the target libraries 'configure' scripts find the proper CPP.
+I noticed that building the mingw32 cross compiler.
+Looking at the build script for mingw in archlinux, I think that only nixos
+needs this patch. I don't know why.
+diff --git a/Makefile.in b/Makefile.in
+index 93f66b6..d691917 100644
+--- a/Makefile.in
++++ b/Makefile.in
+@@ -266,6 +266,7 @@ BASE_TARGET_EXPORTS = \
+ 	AR="$(AR_FOR_TARGET)"; export AR; \
+ 	AS="$(COMPILER_AS_FOR_TARGET)"; export AS; \
+ 	CC="$(CC_FOR_TARGET) $(XGCC_FLAGS_FOR_TARGET) $$TFLAGS"; export CC; \
++	CPP="$(CC_FOR_TARGET) $(XGCC_FLAGS_FOR_TARGET) $$TFLAGS -E"; export CC; \
+ 	CFLAGS="$(CFLAGS_FOR_TARGET)"; export CFLAGS; \
+ 	CONFIG_SHELL="$(SHELL)"; export CONFIG_SHELL; \
+ 	CPPFLAGS="$(CPPFLAGS_FOR_TARGET)"; export CPPFLAGS; \
+@@ -291,11 +292,13 @@ BASE_TARGET_EXPORTS = \
+ RAW_CXX_TARGET_EXPORTS = \
+ 	$(BASE_TARGET_EXPORTS) \
+ 	CXX_FOR_TARGET="$(RAW_CXX_FOR_TARGET)"; export CXX_FOR_TARGET; \
+-	CXX="$(RAW_CXX_FOR_TARGET) $(XGCC_FLAGS_FOR_TARGET) $$TFLAGS"; export CXX;
++	CXX="$(RAW_CXX_FOR_TARGET) $(XGCC_FLAGS_FOR_TARGET) $$TFLAGS"; export CXX; \
++	CXXCPP="$(RAW_CXX_FOR_TARGET) $(XGCC_FLAGS_FOR_TARGET) $$TFLAGS -E"; export CXX;
+ 
+ NORMAL_TARGET_EXPORTS = \
+ 	$(BASE_TARGET_EXPORTS) \
+-	CXX="$(CXX_FOR_TARGET) $(XGCC_FLAGS_FOR_TARGET) $$TFLAGS"; export CXX;
++	CXX="$(CXX_FOR_TARGET) $(XGCC_FLAGS_FOR_TARGET) $$TFLAGS"; export CXX; \
++	CXXCPP="$(CXX_FOR_TARGET) $(XGCC_FLAGS_FOR_TARGET) $$TFLAGS -E"; export CXX;
+ 
+ # Where to find GMP
+ HOST_GMPLIBS = @gmplibs@

pkgs/development/compilers/gcc/patches/ppc-musl.patch

@@ -0,0 +1,18 @@
+diff --git a/gcc/config/rs6000/sysv4.h b/gcc/config/rs6000/sysv4.h
+index cbee89140dd..e1f26b0a096 100644
+--- a/gcc/config/rs6000/sysv4.h
++++ b/gcc/config/rs6000/sysv4.h
+@@ -996,13 +996,7 @@ ncrtn.o%s"
+     { GPLUSPLUS_BACKWARD_INCLUDE_DIR, "G++", 1, 1,	\
+       GPLUSPLUS_INCLUDE_DIR_ADD_SYSROOT, 0 },
+ 
+-#ifdef LOCAL_INCLUDE_DIR
+-#define INCLUDE_DEFAULTS_MUSL_LOCAL			\
+-    { LOCAL_INCLUDE_DIR, 0, 0, 1, 1, 2 },		\
+-    { LOCAL_INCLUDE_DIR, 0, 0, 1, 1, 0 },
+-#else
+ #define INCLUDE_DEFAULTS_MUSL_LOCAL
+-#endif
+ 
+ #ifdef PREFIX_INCLUDE_DIR
+ #define INCLUDE_DEFAULTS_MUSL_PREFIX			\