gnat: make it build again (close #5307)

Problems are worked around by using older gcc wrapper for gnat bootstrap.
(from ca441636f1^)

I tried nicer solutions first, but I was unable to fix all problems for hours.

1 files changed, 43 insertions, 0 deletions

diff --git a/pkgs/build-support/gcc-wrapper-old/gnatlink-wrapper.sh b/pkgs/build-support/gcc-wrapper-old/gnatlink-wrapper.sh
new file mode 100644
index 000000000000..25907108b4db
--- /dev/null
+++ b/pkgs/build-support/gcc-wrapper-old/gnatlink-wrapper.sh
@@ -0,0 +1,43 @@
+#! @shell@ -e
+
+# Add the flags for the GNAT compiler proper.
+extraAfter="--GCC=@out@/bin/gcc"
+extraBefore=()
+
+# Add the flags that should be passed to the linker (and prevent
+# `ld-wrapper' from adding NIX_LDFLAGS again).
+#for i in $NIX_LDFLAGS_BEFORE; do
+#    extraBefore=(${extraBefore[@]} "-largs $i")
+#done
+
+# Optionally print debug info.
+if test "$NIX_DEBUG" = "1"; then
+  echo "original flags to @gnatlinkProg@:" >&2
+  for i in "$@"; do
+      echo "  $i" >&2
+  done
+  echo "extraBefore flags to @gnatlinkProg@:" >&2
+  for i in ${extraBefore[@]}; do
+      echo "  $i" >&2
+  done
+  echo "extraAfter flags to @gnatlinkProg@:" >&2
+  for i in ${extraAfter[@]}; do
+      echo "  $i" >&2
+  done
+fi
+
+if test -n "$NIX_GNAT_WRAPPER_EXEC_HOOK"; then
+    source "$NIX_GNAT_WRAPPER_EXEC_HOOK"
+fi
+
+
+# Call the real `gcc'.  Filter out warnings from stderr about unused
+# `-B' flags, since they confuse some programs.  Deep bash magic to
+# apply grep to stderr (by swapping stdin/stderr twice).
+if test -z "$NIX_GNAT_NEEDS_GREP"; then
+    @gnatlinkProg@ ${extraBefore[@]} "$@" ${extraAfter[@]}
+else
+    (@gnatlinkProg@ ${extraBefore[@]} "$@" ${extraAfter[@]} 3>&2 2>&1 1>&3- \
+        | (grep -v 'file path prefix' || true); exit ${PIPESTATUS[0]}) 3>&2 2>&1 1>&3-
+    exit $?
+fi