Avoid Use of Regexes in Building Package-Config File
diff --git a/lib/Makefile b/lib/Makefile
index 7a736d3..d04caf6 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -353,6 +353,8 @@
all: libzstd.pc
+HAS_EXPLICIT_EXEC_PREFIX := $(if $(or $(EXEC_PREFIX),$(exec_prefix)),1,)
+
DESTDIR ?=
# directory variables : GNU conventions prefer lowercase
# see https://www.gnu.org/prep/standards/html_node/Makefile-Conventions.html
@@ -366,24 +368,17 @@
includedir ?= $(PREFIX)/include
INCLUDEDIR ?= $(includedir)
-PCLIBDIR ?= $(shell echo "$(LIBDIR)" | sed -n $(SED_ERE_OPT) -e "s@^$(EXEC_PREFIX)(/|$$)@@p")
-PCINCDIR ?= $(shell echo "$(INCLUDEDIR)" | sed -n $(SED_ERE_OPT) -e "s@^$(PREFIX)(/|$$)@@p")
+PCINCDIR := $(patsubst $(PREFIX)%,%,$(INCLUDEDIR))
+PCLIBDIR := $(patsubst $(EXEC_PREFIX)%,%,$(LIBDIR))
-ifeq (,$(PCLIBDIR))
-# Additional prefix check is required, since the empty string is technically a
-# valid PCLIBDIR
-ifeq (,$(shell echo "$(LIBDIR)" | sed -n $(SED_ERE_OPT) -e "\\@^$(EXEC_PREFIX)(/|$$)@ p"))
-$(error configured libdir ($(LIBDIR)) is outside of prefix ($(EXEC_PREFIX)), can't generate pkg-config file)
-endif
-endif
+# If we successfully stripped off a prefix, we'll add a reference to the
+# relevant pc variable.
+PCINCPREFIX := $(if $(findstring $(INCLUDEDIR),$(PCINCDIR)),,$${prefix})
+PCLIBPREFIX := $(if $(findstring $(LIBDIR),$(PCLIBDIR)),,$${exec_prefix})
-ifeq (,$(PCINCDIR))
-# Additional prefix check is required, since the empty string is technically a
-# valid PCINCDIR
-ifeq (,$(shell echo "$(INCLUDEDIR)" | sed -n $(SED_ERE_OPT) -e "\\@^$(PREFIX)(/|$$)@ p"))
-$(error configured includedir ($(INCLUDEDIR)) is outside of exec_prefix ($(PREFIX)), can't generate pkg-config file)
-endif
-endif
+# If no explicit EXEC_PREFIX was set by the caller, write it out as a reference
+# to PREFIX, rather than as a resolved value.
+PCEXEC_PREFIX := $(if $(HAS_EXPLICIT_EXEC_PREFIX),$(EXEC_PREFIX),$${prefix})
ifneq (,$(filter $(UNAME),FreeBSD NetBSD DragonFly))
PKGCONFIGDIR ?= $(PREFIX)/libdata/pkgconfig
@@ -404,9 +399,11 @@
libzstd.pc:
libzstd.pc: libzstd.pc.in
@echo creating pkgconfig
- @sed $(SED_ERE_OPT) -e 's|@PREFIX@|$(PREFIX)|' \
- -e 's|@LIBDIR@|$(PCLIBDIR)|' \
- -e 's|@INCLUDEDIR@|$(PCINCDIR)|' \
+ @sed $(SED_ERE_OPT) \
+ -e 's|@PREFIX@|$(PREFIX)|' \
+ -e 's|@EXEC_PREFIX@|$(PCEXEC_PREFIX)|' \
+ -e 's|@INCLUDEDIR@|$(PCINCPREFIX)$(PCINCDIR)|' \
+ -e 's|@LIBDIR@|$(PCLIBPREFIX)$(PCLIBDIR)|' \
-e 's|@VERSION@|$(VERSION)|' \
$< >$@
diff --git a/lib/libzstd.pc.in b/lib/libzstd.pc.in
index 8ec0235..8465c97 100644
--- a/lib/libzstd.pc.in
+++ b/lib/libzstd.pc.in
@@ -3,9 +3,9 @@
# BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
prefix=@PREFIX@
-exec_prefix=${prefix}
-includedir=${prefix}/@INCLUDEDIR@
-libdir=${exec_prefix}/@LIBDIR@
+exec_prefix=@EXEC_PREFIX@
+includedir=@INCLUDEDIR@
+libdir=@LIBDIR@
Name: zstd
Description: fast lossless compression algorithm library