Don't "shell out" to resolve paths. Using pure perl makes llvm-config

friendlier to non-Unixes that happen to have perl. Patch from Sascha Othman!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58687 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/tools/llvm-config/llvm-config.in.in b/tools/llvm-config/llvm-config.in.in
index 36b5112bb67b6f61a5eac6194c5f6612298ae253..677fdcb0bfe78d11ad4fff8009b52dfe53ce6b8b 100644 (file)
--- a/tools/llvm-config/llvm-config.in.in
+++ b/tools/llvm-config/llvm-config.in.in
@@ -18,6 +18,7 @@
 use 5.006;
 use strict;
 use warnings;
+use Cwd;
 
 #---- begin autoconf values ----
 my $PACKAGE_NAME        = q{@PACKAGE_NAME@};
@@ -64,21 +65,13 @@ my $LLVM_BUILDMODE      = q{@LLVM_BUILDMODE@};
 # Convert the current executable name into its directory (e.g. ".").
 my ($RUN_DIR) = ($0 =~ /^(.*)\/.*$/);
 
-# Find the unix pwd program: we don't want to use the bash builtin, as it does
-# not look through symlinks etc.
-my $PWD = `which pwd`;
-chomp($PWD);
-$PWD = "pwd" if (!-e $PWD);
-
 # Turn the directory into an absolute directory on the file system, also pop up
 # from "bin" into the build or prefix dir.
-my $ABS_RUN_DIR = `cd $RUN_DIR/..; $PWD`;
-chomp($ABS_RUN_DIR);
+my $ABS_RUN_DIR = Cwd::realpath("$RUN_DIR/..");
 
 # Compute the absolute object directory build, e.g. "foo/llvm/Debug".
 my $ABS_OBJ_ROOT = "$LLVM_OBJ_ROOT/$LLVM_BUILDMODE";
-$ABS_OBJ_ROOT = `cd $ABS_OBJ_ROOT; $PWD` if (-d $ABS_OBJ_ROOT);
-chomp($ABS_OBJ_ROOT);
+$ABS_OBJ_ROOT = Cwd::realpath($ABS_OBJ_ROOT) if (-d $ABS_OBJ_ROOT);
 
 my $INCLUDEDIR = "$ABS_RUN_DIR/include";
 my $LIBDIR     = "$ABS_RUN_DIR/lib";
@@ -142,9 +135,9 @@ foreach my $arg (@ARGV) {
         } elsif ($arg eq "--build-mode") {
             $has_opt = 1; print "$LLVM_BUILDMODE\n";
         } elsif ($arg eq "--obj-root") {
-            $has_opt = 1; print `cd $LLVM_OBJ_ROOT/; $PWD`;
+            $has_opt = 1; print Cwd::realpath($LLVM_OBJ_ROOT), "\n";
         } elsif ($arg eq "--src-root") {
-            $has_opt = 1; print `cd $LLVM_SRC_ROOT/; $PWD`;
+            $has_opt = 1; print Cwd::realpath($LLVM_SRC_ROOT), "\n";
         } else {
             usage();
         }