nixpkgs/pkgs/build-support/cc-wrapper/gnat-wrapper.sh
Anthony Cowley d96893647d cc-wrapper: fix on darwin
The ld-wrapper.sh script calls `readlink` in some circumstances. We need
to ensure that this is the `readlink` from the `coreutils` package so
that flag support is as expected.

This is accomplished by explicitly setting PATH at the top of each shell
script.

Without doing this, the following happens with a trivial `main.c`:

```
nix-env -f "<nixpkgs>" -iA pkgs.clang
$ clang main.c -L /nix/../nix/store/2ankvagznq062x1gifpxwkk7fp3xwy63-xnu-2422.115.4/Library -o a.out
readlink: illegal option -- f
usage: readlink [-n] [file ...]
```

The key element is the `..` in the path supplied to the linker via a
`-L` flag. With this patch, the above invocation works correctly on
darwin, whose native `/usr/bin/readlink` does not support the `-f` flag.

The explicit path also ensures that the `grep` called by `cc-wrapper.sh`
is the one from Nix.

Fixes #6447
2016-01-19 17:47:11 -05:00

108 lines
2.8 KiB
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#! @shell@ -e
path_backup=$PATH
if [ -n "@coreutils@" ]; then
PATH="@coreutils@/bin"
fi
if [ -n "$NIX_GNAT_WRAPPER_START_HOOK" ]; then
source "$NIX_GNAT_WRAPPER_START_HOOK"
fi
if [ -z "$NIX_GNAT_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 [ "$i" = -M ]; then
dontLink=1
elif [ "${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:0:3}" = -I/ ] && badPath "${p:2}"; then
skip $p
elif [ "${p:0:4}" = -aI/ ] && badPath "${p:3}"; then
skip $p
elif [ "${p:0:4}" = -aO/ ] && badPath "${p:3}"; then
skip $p
else
rest=("${rest[@]}" "$p")
fi
n=$((n + 1))
done
params=("${rest[@]}")
fi
# Add the flags for the GNAT compiler proper.
extraAfter=($NIX_GNATFLAGS_COMPILE)
extraBefore=()
if [ "`basename $0`x" = "gnatmakex" ]; then
extraBefore=("--GNATBIND=@out@/bin/gnatbind --GNATLINK=@out@/bin/gnatlink ")
fi
# 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 $i")
#done
# Optionally print debug info.
if [ -n "$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_GNAT_WRAPPER_EXEC_HOOK" ]; then
source "$NIX_GNAT_WRAPPER_EXEC_HOOK"
fi
PATH=$path_backup
exec @prog@ ${extraBefore[@]} "${params[@]}" ${extraAfter[@]}