Detect SQLite in configure.ac

[erlend-aasland]

BPO	45774
Nosy	@tiran, @erlend-aasland
PRs	bpo-45774: Autoconfiscate SQLite detection (GH-29507) #29507 bpo-45774: Fix SQLite load extension autodetection (GH-29659) #29659 bpo-45774: Harden SQLite detection #30016

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2022-04-05.13:56:26.148>
created_at = <Date 2021-11-09.22:26:46.277>
labels = ['type-feature', 'build', '3.11']
title = 'Detect SQLite in configure.ac'
updated_at = <Date 2022-04-05.13:56:26.148>
user = 'https://github.com/erlend-aasland'

bugs.python.org fields:

activity = <Date 2022-04-05.13:56:26.148>
actor = 'erlendaasland'
assignee = 'none'
closed = True
closed_date = <Date 2022-04-05.13:56:26.148>
closer = 'erlendaasland'
components = ['Build']
creation = <Date 2021-11-09.22:26:46.277>
creator = 'erlendaasland'
dependencies = []
files = []
hgrepos = []
issue_num = 45774
keywords = ['patch']
message_count = 11.0
messages = ['406059', '406061', '406066', '406076', '406584', '406585', '406652', '406653', '406655', '408161', '416775']
nosy_count = 2.0
nosy_names = ['christian.heimes', 'erlendaasland']
pr_nums = ['29507', '29659', '30016']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue45774'
versions = ['Python 3.11']

[erlend-aasland]

"Autoconfiscate" SQLite detection. Plan:

• Detect header/library using AC_CHECK_HEADERS/AC_CHECK_LIB
• Check required version using AC_COMPILE_IFELSE
• Use AC_CHECK_LIB to check if sqlite3_load_extension is present, and if the result harmonises with --enable-loadable-sqlite-extensions; bail if not

Nice side effect: configure will bail if --enable-loadable-sqlite-extensions is used and the target SQLite library was compiled with SQLITE_OMIT_LOAD_EXTENSION, even if we are not on macOS.

[tiran]

Your solution looks very similar to my WIP patch:

AC_CHECK_HEADERS([sqlite3.h],
[AC_SEARCH_LIBS([sqlite3_version], [sqlite3])]
)

AS_VAR_IF([ac_cv_search_sqlite3_version], [no], [], [
 # found a working sqlite3.h and sqlite3 library
 # ac_cv_search_sqlite3_version != no
 LIBS="$LIBS $ac_cv_search_sqlite3_version"
 
 AC_CACHE_CHECK([for sqlite3 version >= 3.7.15], [ac_cv_lib_sqlite3_supported], [
 AC_LINK_IFELSE([
 AC_LANG_PROGRAM([
 #include <sqlite3.h>
 #if SQLITE_VERSION_NUMBER < 3007015
 #error "sqlite version is too old"
 #endif], []
 )
 ], [ac_cv_lib_sqlite3_supported=yes], [ac_cv_lib_sqlite3_supported=no])
 ])
 
 AC_CACHE_CHECK([for sqlite3_enable_load_extension], [ac_cv_lib_sqlite3_sqlite3_enable_load_extension], [
 AC_LINK_IFELSE(
 [AC_LANG_PROGRAM([#include <sqlite3.h>], [void *x = sqlite3_enable_load_extension])],
 [ac_cv_lib_sqlite3_sqlite3_enable_load_extension=yes],
 [ac_cv_lib_sqlite3_sqlite3_enable_load_extension=no])
 ])
])

LIBS=$LIBS_SAVE

AS_VAR_IF([ac_cv_lib_sqlite3_supported], [yes],
[AC_DEFINE([HAVE_LIBSQLITE3], [1], [Define to 1 if you have the `sqlite3' library (-lsqlite3).])]
)

AS_VAR_IF([ac_cv_lib_sqlite3_sqlite3_enable_load_extension], [yes],
[AC_DEFINE([HAVE_SQLITE3_ENABLE_LOAD_EXTENSION], [1],
[Define to 1 if `sqlite3' library supports sqlite3_enable_load_extension.])]
)

[erlend-aasland]

Nice. I think I'll steal some of your ideas tomorrow :)

[tiran]

I saw your message concerning sqlite3 on the FreeBSD buildbot. It's hard to tell why configure on FreeBSD doesn't find sqlite3.h without access to config.log or a shell. Maybe sqlite3 is installed in /usr/local ? configure does not use /usr/local/include and /usr/local/lib by default. setup.py extends the search paths for headers and libraries by non-standard locations.

A "config.site" file should do the trick:

$ mkdir -p /usr/local/etc
$ cat > /usr/local/etc/config.site << EOF
test -z "$CPPFLAGS" && CPPFLAGS="-I$/usr/local/include"
test -z "$LDFLAGS" && LDFLAGS="-L/usr/local/lib"
EOF

[tiran]

New changeset 29e5874 by Erlend Egeberg Aasland in branch 'main':
bpo-45774: Autoconfiscate SQLite detection (GH-29507)
29e5874

[tiran]

Awesome work! Thanks to your tireless effort we know have a blue print how to use pkg-config for other librariess.

[erlend-aasland]

Needs amendment before closing. See #73845.