1 files changed, 74 insertions, 0 deletions
diff --git a/nixpkgs/pkgs/stdenv/cygwin/wrap-exes-to-find-dlls.sh b/nixpkgs/pkgs/stdenv/cygwin/wrap-exes-to-find-dlls.sh
new file mode 100644
index 000000000000..d0da8c1b65c2
--- /dev/null
+++ b/nixpkgs/pkgs/stdenv/cygwin/wrap-exes-to-find-dlls.sh
@@ -0,0 +1,74 @@
+postFixupHooks+=(_cygwinWrapExesToFindDlls)
+
+_cygwinWrapExesToFindDlls() {
+    find $out -type l | while read LINK; do
+        TARGET="$(readlink "${LINK}")"
+
+        # fix all non .exe links that link explicitly to a .exe
+        if [[ ${TARGET} == *.exe ]] && [[ ${LINK} != *.exe ]]; then
+            mv "${LINK}" "${LINK}.exe"
+            LINK="${LINK}.exe"
+        fi
+
+        # generate complementary filenames
+        if [[ ${LINK} == *.exe ]]; then
+            _LINK="${LINK%.exe}"
+            _TARGET="${TARGET%.exe}"
+        else
+            _LINK="${LINK}.exe"
+            _TARGET="${TARGET}.exe"
+        fi
+
+        # check if sould create complementary link
+        DOLINK=1
+        if [[ ${_TARGET} == *.exe ]]; then
+            # the canonical target has to be a .exe
+            CTARGET="$(readlink -f "${LINK}")"
+            if [[ ${CTARGET} != *.exe ]]; then
+                CTARGET="${CTARGET}.exe"
+            fi
+
+            if [ ! -e "${CTARGET}" ]; then
+                unset DOLINK
+            fi
+        fi
+
+        if [ -e "${_LINK}" ]; then
+            # complementary link seems to exist
+            # but could be cygwin smoke and mirrors
+            INO=$(stat -c%i "${LINK}")
+            _INO=$(stat -c%i "${_LINK}")
+            if [ "${INO}" -ne "${_INO}" ]; then
+                unset DOLINK
+            fi
+        fi
+
+        # create complementary link
+        if [ -n "${DOLINK}" ]; then
+            ln -s "${_TARGET}" "${_LINK}.tmp"
+            mv "${_LINK}.tmp" "${_LINK}"
+        fi
+    done
+
+    find $out -type f -name "*.exe" | while read EXE; do
+        WRAPPER="${EXE%.exe}"
+        if [ -e "${WRAPPER}" ]; then
+            # check if really exists or cygwin smoke and mirrors
+            INO=$(stat -c%i "${EXE}")
+            _INO=$(stat -c%i "${WRAPPER}")
+            if [ "${INO}" -ne "${_INO}" ]; then
+                continue
+            fi
+        fi
+
+        mv "${EXE}" "${EXE}.tmp"
+
+        cat >"${WRAPPER}" <<EOF
+#!/bin/sh
+export PATH=$_PATH${_PATH:+:}\${PATH}
+exec "\$0.exe" "\$@"
+EOF
+        chmod +x "${WRAPPER}"
+        mv "${EXE}.tmp" "${EXE}"
+    done
+}