nixpkgs/pkgs/build-support/gcc-wrapper2/ld-wrapper.sh
Lluís Batlle i Rossell f3c23487a2 Adding a new version of the gcc-wrapper, named gcc-wrapper2, in order not to rebuild
stdenv.

In this gcc-wrapper2 I made the ld-wrapper.sh to handle the linking with shared
objects through direct pass as ld command arguments of the absolute path to shared
objects, instead of using the -L/-l combinations.

cmake 'FindXXX.cmake' modules make a strong usage of the dynamic linking directly
passing the absolute path to the shared object to the linker, and as our wrapper did
not add any -rpath for those, writting the nix expressions for some cmake packages
resulted in a lot of tricks, compared to using this gcc-wrapper2.

This gcc-wrapper2/ld-wrapper.sh should become the gcc-wrapper/ld-wrapper in a
stdenv update.

I also updated some cmake expressions to use this gcc-wrapper2, and reduced its
tricks.

I also updated the cmake setup-hook for it to make cmake not touch any rpath decided
at build time, when running the 'make install' of makefiles created by cmake.

svn path=/nixpkgs/trunk/; revision=18885
2009-12-10 22:19:52 +00:00

156 lines
4.2 KiB
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#! @shell@ -e
if test -n "$NIX_LD_WRAPPER_START_HOOK"; then
source "$NIX_LD_WRAPPER_START_HOOK"
fi
if test -z "$NIX_GCC_WRAPPER_FLAGS_SET"; then
source @out@/nix-support/add-flags.sh
fi
source @out@/nix-support/utils.sh
# Optionally filter out paths not refering to the store.
params=("$@")
if test "$NIX_ENFORCE_PURITY" = "1" -a -n "$NIX_STORE" \
-a \( -z "$NIX_IGNORE_LD_THROUGH_GCC" -o -z "$NIX_LDFLAGS_SET" \); then
rest=()
n=0
while test $n -lt ${#params[*]}; do
p=${params[n]}
p2=${params[$((n+1))]}
if test "${p:0:3}" = "-L/" && badPath "${p:2}"; then
skip $p
elif test "$p" = "-L" && badPath "$p2"; then
n=$((n + 1)); skip $p2
elif test "$p" = "-rpath" && badPath "$p2"; then
n=$((n + 1)); skip $p2
elif test "$p" = "-dynamic-linker" && badPath "$p2"; then
n=$((n + 1)); skip $p2
elif test "${p:0:1}" = "/" && badPath "$p"; then
# We cannot skip this; barf.
echo "impure path \`$p' used in link" >&2
exit 1
else
rest=("${rest[@]}" "$p")
fi
n=$((n + 1))
done
params=("${rest[@]}")
fi
extra=()
extraBefore=()
if test -z "$NIX_LDFLAGS_SET"; then
extra=(${extra[@]} $NIX_LDFLAGS)
extraBefore=(${extraBefore[@]} $NIX_LDFLAGS_BEFORE)
fi
# Add all used dynamic libraries to the rpath.
if test "$NIX_DONT_SET_RPATH" != "1"; then
# First, find all -L... switches.
allParams=("${params[@]}" ${extra[@]})
libPath=""
addToLibPath() {
local path="$1"
if test "${path:0:1}" != "/"; then return 0; fi
case "$path" in
*..*|*./*|*/.*|*//*)
local path2
if path2=$(readlink -f "$path"); then
path="$path2"
fi
;;
esac
case $libPath in
*\ $path\ *) return 0 ;;
esac
libPath="$libPath $path "
}
n=0
while test $n -lt ${#allParams[*]}; do
p=${allParams[n]}
p2=${allParams[$((n+1))]}
if test "${p:0:3}" = "-L/"; then
addToLibPath ${p:2}
elif test "$p" = "-L"; then
addToLibPath ${p2}
n=$((n + 1))
elif $(echo "$p" | grep -q '\.so\($\|\.\)'); then
path="$(dirname "$p")";
addToLibPath "${path}"
fi
n=$((n + 1))
done
# Second, for each directory in the library search path (-L...),
# see if it contains a dynamic library used by a -l... flag. If
# so, add the directory to the rpath.
rpath=""
addToRPath() {
# If the path is not in the store, don't add it to the rpath.
# This typically happens for libraries in /tmp that are later
# copied to $out/lib. If not, we're screwed.
if test "${1:0:${#NIX_STORE}}" != "$NIX_STORE"; then return 0; fi
case $rpath in
*\ $1\ *) return 0 ;;
esac
rpath="$rpath $1 "
}
for i in $libPath; do
n=0
while test $n -lt ${#allParams[*]}; do
p=${allParams[n]}
p2=${allParams[$((n+1))]}
if test "${p:0:2}" = "-l" -a -f "$i/lib${p:2}.so"; then
addToRPath $i
break
elif test "$p" = "-l" -a -f "$i/lib${p2}"; then
# I haven't seen `-l foo', but you never know...
addToRPath $i
break
elif $(echo "$p" | grep -q '\.so\($\|\.\)'); then
path="$(dirname "$p")";
if test "$path" == "$i"; then
addToRPath $i
break;
fi
fi
n=$((n + 1))
done
done
# Finally, add `-rpath' switches.
for i in $rpath; do
extra=(${extra[@]} -rpath $i)
done
fi
# Optionally print debug info.
if test "$NIX_DEBUG" = "1"; then
echo "original flags to @ld@:" >&2
for i in "${params[@]}"; do
echo " $i" >&2
done
echo "extra flags to @ld@:" >&2
for i in ${extra[@]}; do
echo " $i" >&2
done
fi
if test -n "$NIX_LD_WRAPPER_EXEC_HOOK"; then
source "$NIX_LD_WRAPPER_EXEC_HOOK"
fi
exec @ld@ ${extraBefore[@]} "${params[@]}" ${extra[@]}