From 267a57022699453e8d8f517519df25ac6bf6ac4e Mon Sep 17 00:00:00 2001
From: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Date: Sun, 16 Dec 2018 11:52:18 +0100
Subject: [PATCH] Only prefix with the sysroot a subset of variables

The standard logic of pkg-config is to prefix all absolute paths by
the sysroot defined in PKG_CONFIG_SYSROOT_DIR. However, while some
paths (like includedir, libdir, and paths used in -L and -I options)
indeed need to be prefixed by the sysroot, it is not necessarily the
case for paths that are used on the target. If they get prefixed by
the sysroot, the runtime path on the target is incorrect.

Unfortunately, pkg-config doesn't have a sense of which path needs to
be prefixed by the sysroot, and which path should not be prefixed by
the sysroot.

So, let's simply have a whitelist of paths that should be prefixed:
g_ir_scanner, g_ir_compiler, g_ir_generate, includedir, libdir, mapdir,
pkgdatadir and sdkdir. This list of variables was collected over years of
Buildroot development. All other paths are not prefixed by the sysroot.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
[Updated to include gobject-introspection paths]
Signed-off-by: Adam Duskett <aduskett@gmail.com>
---
 libpkgconf/tuple.c | 60 ++++++++++++++++++++++++++++++++--------------
 1 file changed, 42 insertions(+), 18 deletions(-)

diff --git a/libpkgconf/tuple.c b/libpkgconf/tuple.c
index 8523709..7cd2fff 100644
--- a/libpkgconf/tuple.c
+++ b/libpkgconf/tuple.c
@@ -160,6 +160,21 @@ dequote(const char *value)
 	return buf;
 }
 
+static char *
+pkgconf_tuple_parse_sysroot(const pkgconf_client_t *client, pkgconf_list_t *vars, const char *value, bool add_sysroot);
+
+const char *sysrooted_keys[] = {
+	"g_ir_scanner",
+	"g_ir_compiler",
+	"g_ir_generate",
+	"includedir",
+	"libdir",
+	"mapdir",
+	"pkgdatadir",
+	"sdkdir",
+	NULL,
+};
+
 /*
  * !doc
  *
@@ -180,6 +192,8 @@ pkgconf_tuple_add(const pkgconf_client_t *client, pkgconf_list_t *list, const ch
 {
 	char *dequote_value;
 	pkgconf_tuple_t *tuple = calloc(sizeof(pkgconf_tuple_t), 1);
+	bool add_sysroot = false;
+	int i;
 
 	pkgconf_tuple_find_delete(list, key);
 
@@ -187,9 +201,13 @@ pkgconf_tuple_add(const pkgconf_client_t *client, pkgconf_list_t *list, const ch
 
 	PKGCONF_TRACE(client, "adding tuple to @%p: %s => %s (parsed? %d)", list, key, dequote_value, parse);
 
+	for (i = 0; sysrooted_keys[i] != NULL; i++)
+		if (!strcmp(key, sysrooted_keys[i]))
+			add_sysroot = true;
+
 	tuple->key = strdup(key);
 	if (parse)
-		tuple->value = pkgconf_tuple_parse(client, list, dequote_value);
+		tuple->value = pkgconf_tuple_parse_sysroot(client, list, dequote_value, add_sysroot);
 	else
 		tuple->value = strdup(dequote_value);
 
@@ -233,27 +251,14 @@ pkgconf_tuple_find(const pkgconf_client_t *client, pkgconf_list_t *list, const c
 	return NULL;
 }
 
-/*
- * !doc
- *
- * .. c:function:: char *pkgconf_tuple_parse(const pkgconf_client_t *client, pkgconf_list_t *vars, const char *value)
- *
- *    Parse an expression for variable substitution.
- *
- *    :param pkgconf_client_t* client: The pkgconf client object to access.
- *    :param pkgconf_list_t* list: The variable list to search for variables (along side the global variable list).
- *    :param char* value: The ``key=value`` string to parse.
- *    :return: the variable data with any variables substituted
- *    :rtype: char *
- */
-char *
-pkgconf_tuple_parse(const pkgconf_client_t *client, pkgconf_list_t *vars, const char *value)
+static char *
+pkgconf_tuple_parse_sysroot(const pkgconf_client_t *client, pkgconf_list_t *vars, const char *value, bool add_sysroot)
 {
 	char buf[PKGCONF_BUFSIZE];
 	const char *ptr;
 	char *bptr = buf;
 
-	if (*value == '/' && client->sysroot_dir != NULL && strncmp(value, client->sysroot_dir, strlen(client->sysroot_dir)))
+	if (add_sysroot && *value == '/' && client->sysroot_dir != NULL && strncmp(value, client->sysroot_dir, strlen(client->sysroot_dir)))
 		bptr += pkgconf_strlcpy(buf, client->sysroot_dir, sizeof buf);
 
 	for (ptr = value; *ptr != '\0' && bptr - buf < PKGCONF_BUFSIZE; ptr++)
@@ -293,7 +298,7 @@ pkgconf_tuple_parse(const pkgconf_client_t *client, pkgconf_list_t *vars, const
 
 				if (kv != NULL)
 				{
-					parsekv = pkgconf_tuple_parse(client, vars, kv);
+					parsekv = pkgconf_tuple_parse_sysroot(client, vars, kv, add_sysroot);
 
 					strncpy(bptr, parsekv, PKGCONF_BUFSIZE - (bptr - buf));
 					bptr += strlen(parsekv);
@@ -338,6 +343,25 @@ pkgconf_tuple_parse(const pkgconf_client_t *client, pkgconf_list_t *vars, const
 	return strdup(buf);
 }
 
+/*
+ * !doc
+ *
+ * .. c:function:: char *pkgconf_tuple_parse(const pkgconf_client_t *client, pkgconf_list_t *vars, const char *value)
+ *
+ *    Parse an expression for variable substitution.
+ *
+ *    :param pkgconf_client_t* client: The pkgconf client object to access.
+ *    :param pkgconf_list_t* list: The variable list to search for variables (along side the global variable list).
+ *    :param char* value: The ``key=value`` string to parse.
+ *    :return: the variable data with any variables substituted
+ *    :rtype: char *
+ */
+char *
+pkgconf_tuple_parse(const pkgconf_client_t *client, pkgconf_list_t *vars, const char *value)
+{
+	return pkgconf_tuple_parse_sysroot(client, vars, value, true);
+}
+
 /*
  * !doc
  *
-- 
2.19.2