rename gcc-wrapper to cc-wrapper.

also makes cc-wrapper compatible with clang in the darwin fork.

1 files changed, 158 insertions, 0 deletions

diff --git a/pkgs/build-support/cc-wrapper/cc-wrapper.sh b/pkgs/build-support/cc-wrapper/cc-wrapper.sh
new file mode 100644
index 000000000000..3a7e24dfcafb
--- /dev/null
+++ b/pkgs/build-support/cc-wrapper/cc-wrapper.sh
@@ -0,0 +1,158 @@
+#! @shell@ -e
+
+if [ -n "$NIX_CC_WRAPPER_START_HOOK" ]; then
+    source "$NIX_CC_WRAPPER_START_HOOK"
+fi
+
+if [ -z "$NIX_CC_WRAPPER_FLAGS_SET" ]; then
+    source @out@/nix-support/add-flags.sh
+fi
+
+source @out@/nix-support/utils.sh
+
+
+# Figure out if linker flags should be passed.  GCC prints annoying
+# warnings when they are not needed.
+dontLink=0
+getVersion=0
+nonFlagArgs=0
+
+for i in "$@"; do
+    if [ "$i" = -c ]; then
+        dontLink=1
+    elif [ "$i" = -S ]; then
+        dontLink=1
+    elif [ "$i" = -E ]; then
+        dontLink=1
+    elif [ "$i" = -E ]; then
+        dontLink=1
+    elif [ "$i" = -M ]; then
+        dontLink=1
+    elif [ "$i" = -MM ]; then
+        dontLink=1
+    elif [ "$i" = -x ]; then
+        # At least for the cases c-header or c++-header we should set dontLink.
+        # I expect no one use -x other than making precompiled headers.
+        dontLink=1
+    elif [ "${i:0:1}" != - ]; then
+        nonFlagArgs=1
+    elif [ "$i" = -m32 ]; then
+        if [ -e @out@/nix-support/dynamic-linker-m32 ]; then
+            NIX_LDFLAGS="$NIX_LDFLAGS -dynamic-linker $(cat @out@/nix-support/dynamic-linker-m32)"
+        fi
+    fi
+done
+
+# If we pass a flag like -Wl, then gcc will call the linker unless it
+# can figure out that it has to do something else (e.g., because of a
+# "-c" flag).  So if no non-flag arguments are given, don't pass any
+# linker flags.  This catches cases like "gcc" (should just print
+# "gcc: no input files") and "gcc -v" (should print the version).
+if [ "$nonFlagArgs" = 0 ]; then
+    dontLink=1
+fi
+
+
+# Optionally filter out paths not refering to the store.
+params=("$@")
+if [ "$NIX_ENFORCE_PURITY" = 1 -a -n "$NIX_STORE" ]; then
+    rest=()
+    n=0
+    while [ $n -lt ${#params[*]} ]; do
+        p=${params[n]}
+        p2=${params[$((n+1))]}
+        if [ "${p:0:3}" = -L/ ] && badPath "${p:2}"; then
+            skip $p
+        elif [ "$p" = -L ] && badPath "$p2"; then
+            n=$((n + 1)); skip $p2
+        elif [ "${p:0:3}" = -I/ ] && badPath "${p:2}"; then
+            skip $p
+        elif [ "$p" = -I ] && badPath "$p2"; then
+            n=$((n + 1)); skip $p2
+        elif [ "$p" = -isystem ] && badPath "$p2"; then
+            n=$((n + 1)); skip $p2
+        else
+            rest=("${rest[@]}" "$p")
+        fi
+        n=$((n + 1))
+    done
+    params=("${rest[@]}")
+fi
+
+if test -n "@libcxx@"; then
+    NIX_CFLAGS_COMPILE="$NIX_CFLAGS_COMPILE -isystem@libcxx@/include/c++/v1"
+    if [[ "@prog@" = *++ ]]; then
+        NIX_CFLAGS_COMPILE="$NIX_CFLAGS_COMPILE -stdlib=libc++"
+        if test -z "$NIX_SKIP_CXX"; then
+            NIX_CFLAGS_LINK="$NIX_CFLAGS_LINK -L@libcxx@/lib -stdlib=libc++"
+        fi
+        if test -z "$NIX_SKIP_CXXABI" && echo "$@" | grep -qvw -- -nostdlib; then
+            NIX_CFLAGS_LINK="$NIX_CFLAGS_LINK -L@libcxxabi@/lib -lc++abi"
+        fi
+    fi
+fi
+
+# Add the flags for the C compiler proper.
+extraAfter=($NIX_CFLAGS_COMPILE)
+extraBefore=()
+
+# When enforcing purity, pretend gcc can't find the current date and
+# time
+if [ "$NIX_ENFORCE_PURITY" = 1 ]; then
+    extraAfter+=('-D__DATE__="Jan 01 1970"'
+        '-D__TIME__="00:00:01"'
+        -Wno-builtin-macro-redefined)
+fi
+
+
+if [ "$dontLink" != 1 ]; then
+
+    # Add the flags that should only be passed to the compiler when
+    # linking.
+    extraAfter+=($NIX_CFLAGS_LINK)
+
+    # 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[@]} "-Wl,$i")
+    done
+    for i in $NIX_LDFLAGS; do
+        if [ "${i:0:3}" = -L/ ]; then
+            extraAfter+=("$i")
+        else
+            extraAfter+=("-Wl,$i")
+        fi
+    done
+    export NIX_LDFLAGS_SET=1
+fi
+
+# As a very special hack, if the arguments are just `-v', then don't
+# add anything.  This is to prevent `gcc -v' (which normally prints
+# out the version number and returns exit code 0) from printing out
+# `No input files specified' and returning exit code 1.
+if [ "$*" = -v ]; then
+    extraAfter=()
+    extraBefore=()
+fi
+
+# Optionally print debug info.
+if [ -n "$NIX_DEBUG" ]; then
+  echo "original flags to @prog@:" >&2
+  for i in "${params[@]}"; do
+      echo "  $i" >&2
+  done
+  echo "extraBefore flags to @prog@:" >&2
+  for i in ${extraBefore[@]}; do
+      echo "  $i" >&2
+  done
+  echo "extraAfter flags to @prog@:" >&2
+  for i in ${extraAfter[@]}; do
+      echo "  $i" >&2
+  done
+fi
+
+if [ -n "$NIX_CC_WRAPPER_EXEC_HOOK" ]; then
+    source "$NIX_CC_WRAPPER_EXEC_HOOK"
+fi
+
+exec @prog@ ${extraBefore[@]} "${params[@]}" "${extraAfter[@]}"