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authorÆvar Arnfjörð Bjarmason <avarab@gmail.com>2017-06-01 18:20:56 (GMT)
committerJunio C Hamano <gitster@pobox.com>2017-06-01 23:29:05 (GMT)
commit94da9193a6eb8f1085d611c04ff8bbb4f5ae1e0a (patch)
tree9a6ea07f5e0e77e7330eb83e8ed486af27932427
parentfb95e2e38dd4e8301b3992bacfac4c87b8262181 (diff)
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grep: add support for PCRE v2
Add support for v2 of the PCRE API. This is a new major version of PCRE that came out in early 2015[1]. The regular expression syntax is the same, but while the API is similar, pretty much every function is either renamed or takes different arguments. Thus using it via entirely new functions makes sense, as opposed to trying to e.g. have one compile_pcre_pattern() that would call either PCRE v1 or v2 functions. Git can now be compiled with either USE_LIBPCRE1=YesPlease or USE_LIBPCRE2=YesPlease, with USE_LIBPCRE=YesPlease currently being a synonym for the former. Providing both is a compile-time error. With earlier patches to enable JIT for PCRE v1 the performance of the release versions of both libraries is almost exactly the same, with PCRE v2 being around 1% slower. However after I reported this to the pcre-dev mailing list[2] I got a lot of help with the API use from Zoltán Herczeg, he subsequently optimized some of the JIT functionality in v2 of the library. Running the p7820-grep-engines.sh performance test against the latest Subversion trunk of both, with both them and git compiled as -O3, and the test run against linux.git, gives the following results. Just the /perl/ tests shown: $ GIT_PERF_REPEAT_COUNT=30 GIT_PERF_LARGE_REPO=~/g/linux GIT_PERF_MAKE_COMMAND='grep -q LIBPCRE2 Makefile && make -j8 USE_LIBPCRE2=YesPlease CC=~/perl5/installed/bin/gcc NO_R_TO_GCC_LINKER=YesPlease CFLAGS=-O3 LIBPCREDIR=/home/avar/g/pcre2/inst LDFLAGS=-Wl,-rpath,/home/avar/g/pcre2/inst/lib || make -j8 USE_LIBPCRE=YesPlease CC=~/perl5/installed/bin/gcc NO_R_TO_GCC_LINKER=YesPlease CFLAGS=-O3 LIBPCREDIR=/home/avar/g/pcre/inst LDFLAGS=-Wl,-rpath,/home/avar/g/pcre/inst/lib' ./run HEAD~5 HEAD~ HEAD p7820-grep-engines.sh [...] Test HEAD~5 HEAD~ HEAD ----------------------------------------------------------------------------------------------------------------- 7820.3: perl grep 'how.to' 0.31(1.10+0.48) 0.21(0.35+0.56) -32.3% 0.21(0.34+0.55) -32.3% 7820.7: perl grep '^how to' 0.56(2.70+0.40) 0.24(0.64+0.52) -57.1% 0.20(0.28+0.60) -64.3% 7820.11: perl grep '[how] to' 0.56(2.66+0.38) 0.29(0.95+0.45) -48.2% 0.23(0.45+0.54) -58.9% 7820.15: perl grep '(e.t[^ ]*|v.ry) rare' 1.02(5.77+0.42) 0.31(1.02+0.54) -69.6% 0.23(0.50+0.54) -77.5% 7820.19: perl grep 'm(ú|u)lt.b(æ|y)te' 0.38(1.57+0.42) 0.27(0.85+0.46) -28.9% 0.21(0.33+0.57) -44.7% See commit ("perf: add a comparison test of grep regex engines", 2017-04-19) for details on the machine the above test run was executed on. Here HEAD~2 is git with PCRE v1 without JIT, HEAD~ is PCRE v1 with JIT, and HEAD is PCRE v2 (also with JIT). See previous commits of mine mentioning p7820-grep-engines.sh for more details on the test setup. For ease of readability, a different run just of HEAD~ (PCRE v1 with JIT v.s. PCRE v2), again with just the /perl/ tests shown: [...] Test HEAD~ HEAD ---------------------------------------------------------------------------------------- 7820.3: perl grep 'how.to' 0.21(0.42+0.52) 0.21(0.31+0.58) +0.0% 7820.7: perl grep '^how to' 0.25(0.65+0.50) 0.20(0.31+0.57) -20.0% 7820.11: perl grep '[how] to' 0.30(0.90+0.50) 0.23(0.46+0.53) -23.3% 7820.15: perl grep '(e.t[^ ]*|v.ry) rare' 0.30(1.19+0.38) 0.23(0.51+0.51) -23.3% 7820.19: perl grep 'm(ú|u)lt.b(æ|y)te' 0.27(0.84+0.48) 0.21(0.34+0.57) -22.2% I.e. the two are either neck-to-neck, but PCRE v2 usually pulls ahead, when it does it's around 20% faster. A brief note on thread safety: As noted in pcre2api(3) & pcre2jit(3) the compiled pattern can be shared between threads, but not some of the JIT context, however the grep threading support does all pattern & JIT compilation in separate threads, so this code doesn't need to concern itself with thread safety. See commit 63e7e9d8b6 ("git-grep: Learn PCRE", 2011-05-09) for the initial addition of PCRE v1. This change follows some of the same patterns it did (and which were discussed on list at the time), e.g. mocking up types with typedef instead of ifdef-ing them out when USE_LIBPCRE2 isn't defined. This adds some trivial memory use to the program, but makes the code look nicer. 1. https://lists.exim.org/lurker/message/20150105.162835.0666407a.en.html 2. https://lists.exim.org/lurker/thread/20170419.172322.833ee099.en.html Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
-rw-r--r--Makefile36
-rw-r--r--configure.ac77
-rw-r--r--grep.c145
-rw-r--r--grep.h17
-rw-r--r--t/test-lib.sh2
5 files changed, 256 insertions, 21 deletions
diff --git a/Makefile b/Makefile
index 502c072..96ebbed 100644
--- a/Makefile
+++ b/Makefile
@@ -29,6 +29,11 @@ all::
# Perl-compatible regular expressions instead of standard or extended
# POSIX regular expressions.
#
+# Currently USE_LIBPCRE is a synonym for USE_LIBPCRE1, define
+# USE_LIBPCRE2 instead if you'd like to use version 2 of the PCRE
+# library. The USE_LIBPCRE flag will likely be changed to mean v2 by
+# default in future releases.
+#
# When using USE_LIBPCRE1, define NO_LIBPCRE1_JIT if the PCRE v1
# library is compiled without --enable-jit. We will auto-detect
# whether the version of the PCRE v1 library in use has JIT support at
@@ -37,8 +42,10 @@ all::
# you have link-time errors about a missing `pcre_jit_exec` define
# this, or recompile PCRE v1 with --enable-jit.
#
-# Define LIBPCREDIR=/foo/bar if your libpcre header and library files are in
-# /foo/bar/include and /foo/bar/lib directories.
+# Define LIBPCREDIR=/foo/bar if your PCRE header and library files are
+# in /foo/bar/include and /foo/bar/lib directories. Which version of
+# PCRE this points to determined by the USE_LIBPCRE1 and USE_LIBPCRE2
+# variables.
#
# Define HAVE_ALLOCA_H if you have working alloca(3) defined in that header.
#
@@ -1095,12 +1102,14 @@ ifdef NO_LIBGEN_H
COMPAT_OBJS += compat/basename.o
endif
-ifdef USE_LIBPCRE
- BASIC_CFLAGS += -DUSE_LIBPCRE1
- ifdef LIBPCREDIR
- BASIC_CFLAGS += -I$(LIBPCREDIR)/include
- EXTLIBS += -L$(LIBPCREDIR)/$(lib) $(CC_LD_DYNPATH)$(LIBPCREDIR)/$(lib)
+USE_LIBPCRE1 ?= $(USE_LIBPCRE)
+
+ifneq (,$(USE_LIBPCRE1))
+ ifdef USE_LIBPCRE2
+$(error Only set USE_LIBPCRE1 (or its alias USE_LIBPCRE) or USE_LIBPCRE2, not both!)
endif
+
+ BASIC_CFLAGS += -DUSE_LIBPCRE1
EXTLIBS += -lpcre
ifdef NO_LIBPCRE1_JIT
@@ -1108,6 +1117,16 @@ ifdef NO_LIBPCRE1_JIT
endif
endif
+ifdef USE_LIBPCRE2
+ BASIC_CFLAGS += -DUSE_LIBPCRE2
+ EXTLIBS += -lpcre2-8
+endif
+
+ifdef LIBPCREDIR
+ BASIC_CFLAGS += -I$(LIBPCREDIR)/include
+ EXTLIBS += -L$(LIBPCREDIR)/$(lib) $(CC_LD_DYNPATH)$(LIBPCREDIR)/$(lib)
+endif
+
ifdef HAVE_ALLOCA_H
BASIC_CFLAGS += -DHAVE_ALLOCA_H
endif
@@ -2252,7 +2271,8 @@ GIT-BUILD-OPTIONS: FORCE
@echo TAR=\''$(subst ','\'',$(subst ','\'',$(TAR)))'\' >>$@+
@echo NO_CURL=\''$(subst ','\'',$(subst ','\'',$(NO_CURL)))'\' >>$@+
@echo NO_EXPAT=\''$(subst ','\'',$(subst ','\'',$(NO_EXPAT)))'\' >>$@+
- @echo USE_LIBPCRE1=\''$(subst ','\'',$(subst ','\'',$(USE_LIBPCRE)))'\' >>$@+
+ @echo USE_LIBPCRE1=\''$(subst ','\'',$(subst ','\'',$(USE_LIBPCRE1)))'\' >>$@+
+ @echo USE_LIBPCRE2=\''$(subst ','\'',$(subst ','\'',$(USE_LIBPCRE2)))'\' >>$@+
@echo NO_LIBPCRE1_JIT=\''$(subst ','\'',$(subst ','\'',$(NO_LIBPCRE1_JIT)))'\' >>$@+
@echo NO_PERL=\''$(subst ','\'',$(subst ','\'',$(NO_PERL)))'\' >>$@+
@echo NO_PTHREADS=\''$(subst ','\'',$(subst ','\'',$(NO_PTHREADS)))'\' >>$@+
diff --git a/configure.ac b/configure.ac
index deeb968..11d083f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -255,21 +255,61 @@ GIT_PARSE_WITH([openssl]))
# Perl-compatible regular expressions instead of standard or extended
# POSIX regular expressions.
#
-# Define LIBPCREDIR=/foo/bar if your libpcre header and library files are in
+# Currently USE_LIBPCRE is a synonym for USE_LIBPCRE1, define
+# USE_LIBPCRE2 instead if you'd like to use version 2 of the PCRE
+# library. The USE_LIBPCRE flag will likely be changed to mean v2 by
+# default in future releases.
+#
+# Define LIBPCREDIR=/foo/bar if your PCRE header and library files are in
# /foo/bar/include and /foo/bar/lib directories.
#
AC_ARG_WITH(libpcre,
-AS_HELP_STRING([--with-libpcre],[support Perl-compatible regexes (default is NO)])
+AS_HELP_STRING([--with-libpcre],[synonym for --with-libpcre1]),
+ if test "$withval" = "no"; then
+ USE_LIBPCRE1=
+ elif test "$withval" = "yes"; then
+ USE_LIBPCRE1=YesPlease
+ else
+ USE_LIBPCRE1=YesPlease
+ LIBPCREDIR=$withval
+ AC_MSG_NOTICE([Setting LIBPCREDIR to $LIBPCREDIR])
+ dnl USE_LIBPCRE1 can still be modified below, so don't substitute
+ dnl it yet.
+ GIT_CONF_SUBST([LIBPCREDIR])
+ fi)
+
+AC_ARG_WITH(libpcre1,
+AS_HELP_STRING([--with-libpcre1],[support Perl-compatible regexes via libpcre1 (default is NO)])
+AS_HELP_STRING([], [ARG can be also prefix for libpcre library and headers]),
+ if test "$withval" = "no"; then
+ USE_LIBPCRE1=
+ elif test "$withval" = "yes"; then
+ USE_LIBPCRE1=YesPlease
+ else
+ USE_LIBPCRE1=YesPlease
+ LIBPCREDIR=$withval
+ AC_MSG_NOTICE([Setting LIBPCREDIR to $LIBPCREDIR])
+ dnl USE_LIBPCRE1 can still be modified below, so don't substitute
+ dnl it yet.
+ GIT_CONF_SUBST([LIBPCREDIR])
+ fi)
+
+AC_ARG_WITH(libpcre2,
+AS_HELP_STRING([--with-libpcre2],[support Perl-compatible regexes via libpcre2 (default is NO)])
AS_HELP_STRING([], [ARG can be also prefix for libpcre library and headers]),
+ if test -n "$USE_LIBPCRE1"; then
+ AC_MSG_ERROR([Only supply one of --with-libpcre1 or --with-libpcre2!])
+ fi
+
if test "$withval" = "no"; then
- USE_LIBPCRE=
+ USE_LIBPCRE2=
elif test "$withval" = "yes"; then
- USE_LIBPCRE=YesPlease
+ USE_LIBPCRE2=YesPlease
else
- USE_LIBPCRE=YesPlease
+ USE_LIBPCRE2=YesPlease
LIBPCREDIR=$withval
AC_MSG_NOTICE([Setting LIBPCREDIR to $LIBPCREDIR])
- dnl USE_LIBPCRE can still be modified below, so don't substitute
+ dnl USE_LIBPCRE2 can still be modified below, so don't substitute
dnl it yet.
GIT_CONF_SUBST([LIBPCREDIR])
fi)
@@ -501,13 +541,11 @@ GIT_CONF_SUBST([NEEDS_SSL_WITH_CRYPTO])
GIT_CONF_SUBST([NO_OPENSSL])
#
-# Define USE_LIBPCRE if you have and want to use libpcre. Various
-# commands such as log and grep offer runtime options to use
-# Perl-compatible regular expressions instead of standard or extended
-# POSIX regular expressions.
+# Handle the USE_LIBPCRE1 and USE_LIBPCRE2 options potentially set
+# above.
#
-if test -n "$USE_LIBPCRE"; then
+if test -n "$USE_LIBPCRE1"; then
GIT_STASH_FLAGS($LIBPCREDIR)
@@ -517,7 +555,22 @@ AC_CHECK_LIB([pcre], [pcre_version],
GIT_UNSTASH_FLAGS($LIBPCREDIR)
-GIT_CONF_SUBST([USE_LIBPCRE])
+GIT_CONF_SUBST([USE_LIBPCRE1])
+
+fi
+
+
+if test -n "$USE_LIBPCRE2"; then
+
+GIT_STASH_FLAGS($LIBPCREDIR)
+
+AC_CHECK_LIB([pcre2-8], [pcre2_config_8],
+[USE_LIBPCRE2=YesPlease],
+[USE_LIBPCRE2=])
+
+GIT_UNSTASH_FLAGS($LIBPCREDIR)
+
+GIT_CONF_SUBST([USE_LIBPCRE2])
fi
diff --git a/grep.c b/grep.c
index 19fa67c..d0bf378 100644
--- a/grep.c
+++ b/grep.c
@@ -179,22 +179,37 @@ static void grep_set_pattern_type_option(enum grep_pattern_type pattern_type, st
case GREP_PATTERN_TYPE_BRE:
opt->fixed = 0;
opt->pcre1 = 0;
+ opt->pcre2 = 0;
break;
case GREP_PATTERN_TYPE_ERE:
opt->fixed = 0;
opt->pcre1 = 0;
+ opt->pcre2 = 0;
opt->regflags |= REG_EXTENDED;
break;
case GREP_PATTERN_TYPE_FIXED:
opt->fixed = 1;
opt->pcre1 = 0;
+ opt->pcre2 = 0;
break;
case GREP_PATTERN_TYPE_PCRE:
opt->fixed = 0;
+#ifdef USE_LIBPCRE2
+ opt->pcre1 = 0;
+ opt->pcre2 = 1;
+#else
+ /*
+ * It's important that pcre1 always be assigned to
+ * even when there's no USE_LIBPCRE* defined. We still
+ * call the PCRE stub function, it just dies with
+ * "cannot use Perl-compatible regexes[...]".
+ */
opt->pcre1 = 1;
+ opt->pcre2 = 0;
+#endif
break;
}
}
@@ -446,6 +461,127 @@ static void free_pcre1_regexp(struct grep_pat *p)
}
#endif /* !USE_LIBPCRE1 */
+#ifdef USE_LIBPCRE2
+static void compile_pcre2_pattern(struct grep_pat *p, const struct grep_opt *opt)
+{
+ int error;
+ PCRE2_UCHAR errbuf[256];
+ PCRE2_SIZE erroffset;
+ int options = PCRE2_MULTILINE;
+ const uint8_t *character_tables = NULL;
+ int jitret;
+
+ assert(opt->pcre2);
+
+ p->pcre2_compile_context = NULL;
+
+ if (opt->ignore_case) {
+ if (has_non_ascii(p->pattern)) {
+ character_tables = pcre2_maketables(NULL);
+ p->pcre2_compile_context = pcre2_compile_context_create(NULL);
+ pcre2_set_character_tables(p->pcre2_compile_context, character_tables);
+ }
+ options |= PCRE2_CASELESS;
+ }
+ if (is_utf8_locale() && has_non_ascii(p->pattern))
+ options |= PCRE2_UTF;
+
+ p->pcre2_pattern = pcre2_compile((PCRE2_SPTR)p->pattern,
+ p->patternlen, options, &error, &erroffset,
+ p->pcre2_compile_context);
+
+ if (p->pcre2_pattern) {
+ p->pcre2_match_data = pcre2_match_data_create_from_pattern(p->pcre2_pattern, NULL);
+ if (!p->pcre2_match_data)
+ die("Couldn't allocate PCRE2 match data");
+ } else {
+ pcre2_get_error_message(error, errbuf, sizeof(errbuf));
+ compile_regexp_failed(p, (const char *)&errbuf);
+ }
+
+ pcre2_config(PCRE2_CONFIG_JIT, &p->pcre2_jit_on);
+ if (p->pcre2_jit_on == 1) {
+ jitret = pcre2_jit_compile(p->pcre2_pattern, PCRE2_JIT_COMPLETE);
+ if (jitret)
+ die("Couldn't JIT the PCRE2 pattern '%s', got '%d'\n", p->pattern, jitret);
+ p->pcre2_jit_stack = pcre2_jit_stack_create(1, 1024 * 1024, NULL);
+ if (!p->pcre2_jit_stack)
+ die("Couldn't allocate PCRE2 JIT stack");
+ p->pcre2_match_context = pcre2_match_context_create(NULL);
+ if (!p->pcre2_jit_stack)
+ die("Couldn't allocate PCRE2 match context");
+ pcre2_jit_stack_assign(p->pcre2_match_context, NULL, p->pcre2_jit_stack);
+ } else if (p->pcre2_jit_on != 0) {
+ die("BUG: The pcre2_jit_on variable should be 0 or 1, not %d",
+ p->pcre1_jit_on);
+ }
+}
+
+static int pcre2match(struct grep_pat *p, const char *line, const char *eol,
+ regmatch_t *match, int eflags)
+{
+ int ret, flags = 0;
+ PCRE2_SIZE *ovector;
+ PCRE2_UCHAR errbuf[256];
+
+ if (eflags & REG_NOTBOL)
+ flags |= PCRE2_NOTBOL;
+
+ if (p->pcre2_jit_on)
+ ret = pcre2_jit_match(p->pcre2_pattern, (unsigned char *)line,
+ eol - line, 0, flags, p->pcre2_match_data,
+ NULL);
+ else
+ ret = pcre2_match(p->pcre2_pattern, (unsigned char *)line,
+ eol - line, 0, flags, p->pcre2_match_data,
+ NULL);
+
+ if (ret < 0 && ret != PCRE2_ERROR_NOMATCH) {
+ pcre2_get_error_message(ret, errbuf, sizeof(errbuf));
+ die("%s failed with error code %d: %s",
+ (p->pcre2_jit_on ? "pcre2_jit_match" : "pcre2_match"), ret,
+ errbuf);
+ }
+ if (ret > 0) {
+ ovector = pcre2_get_ovector_pointer(p->pcre2_match_data);
+ ret = 0;
+ match->rm_so = (int)ovector[0];
+ match->rm_eo = (int)ovector[1];
+ }
+
+ return ret;
+}
+
+static void free_pcre2_pattern(struct grep_pat *p)
+{
+ pcre2_compile_context_free(p->pcre2_compile_context);
+ pcre2_code_free(p->pcre2_pattern);
+ pcre2_match_data_free(p->pcre2_match_data);
+ pcre2_jit_stack_free(p->pcre2_jit_stack);
+ pcre2_match_context_free(p->pcre2_match_context);
+}
+#else /* !USE_LIBPCRE2 */
+static void compile_pcre2_pattern(struct grep_pat *p, const struct grep_opt *opt)
+{
+ /*
+ * Unreachable until USE_LIBPCRE2 becomes synonymous with
+ * USE_LIBPCRE. See the sibling comment in
+ * grep_set_pattern_type_option().
+ */
+ die("cannot use Perl-compatible regexes when not compiled with USE_LIBPCRE");
+}
+
+static int pcre2match(struct grep_pat *p, const char *line, const char *eol,
+ regmatch_t *match, int eflags)
+{
+ return 1;
+}
+
+static void free_pcre2_pattern(struct grep_pat *p)
+{
+}
+#endif /* !USE_LIBPCRE2 */
+
static void compile_fixed_regexp(struct grep_pat *p, struct grep_opt *opt)
{
struct strbuf sb = STRBUF_INIT;
@@ -511,6 +647,11 @@ static void compile_regexp(struct grep_pat *p, struct grep_opt *opt)
return;
}
+ if (opt->pcre2) {
+ compile_pcre2_pattern(p, opt);
+ return;
+ }
+
if (opt->pcre1) {
compile_pcre1_regexp(p, opt);
return;
@@ -870,6 +1011,8 @@ void free_grep_patterns(struct grep_opt *opt)
kwsfree(p->kws);
else if (p->pcre1_regexp)
free_pcre1_regexp(p);
+ else if (p->pcre2_pattern)
+ free_pcre2_pattern(p);
else
regfree(&p->regexp);
free(p->pattern);
@@ -950,6 +1093,8 @@ static int patmatch(struct grep_pat *p, char *line, char *eol,
hit = !fixmatch(p, line, eol, match);
else if (p->pcre1_regexp)
hit = !pcre1match(p, line, eol, match, eflags);
+ else if (p->pcre2_pattern)
+ hit = !pcre2match(p, line, eol, match, eflags);
else
hit = !regexec_buf(&p->regexp, line, eol - line, 1, match,
eflags);
diff --git a/grep.h b/grep.h
index 3bff087..6f3d4e1 100644
--- a/grep.h
+++ b/grep.h
@@ -21,6 +21,16 @@ typedef int pcre;
typedef int pcre_extra;
typedef int pcre_jit_stack;
#endif
+#ifdef USE_LIBPCRE2
+#define PCRE2_CODE_UNIT_WIDTH 8
+#include <pcre2.h>
+#else
+typedef int pcre2_code;
+typedef int pcre2_match_data;
+typedef int pcre2_compile_context;
+typedef int pcre2_match_context;
+typedef int pcre2_jit_stack;
+#endif
#include "kwset.h"
#include "thread-utils.h"
#include "userdiff.h"
@@ -65,6 +75,12 @@ struct grep_pat {
pcre_jit_stack *pcre1_jit_stack;
const unsigned char *pcre1_tables;
int pcre1_jit_on;
+ pcre2_code *pcre2_pattern;
+ pcre2_match_data *pcre2_match_data;
+ pcre2_compile_context *pcre2_compile_context;
+ pcre2_match_context *pcre2_match_context;
+ pcre2_jit_stack *pcre2_jit_stack;
+ uint32_t pcre2_jit_on;
kwset_t kws;
unsigned fixed:1;
unsigned ignore_case:1;
@@ -128,6 +144,7 @@ struct grep_opt {
int extended;
int use_reflog_filter;
int pcre1;
+ int pcre2;
int relative;
int pathname;
int null_following_name;
diff --git a/t/test-lib.sh b/t/test-lib.sh
index ab92c0e..44d4679 100644
--- a/t/test-lib.sh
+++ b/t/test-lib.sh
@@ -1011,7 +1011,7 @@ esac
test -z "$NO_PERL" && test_set_prereq PERL
test -z "$NO_PTHREADS" && test_set_prereq PTHREADS
test -z "$NO_PYTHON" && test_set_prereq PYTHON
-test -n "$USE_LIBPCRE1" && test_set_prereq PCRE
+test -n "$USE_LIBPCRE1$USE_LIBPCRE2" && test_set_prereq PCRE
test -z "$NO_GETTEXT" && test_set_prereq GETTEXT
# Can we rely on git's output in the C locale?