Very old shells suffered from bugs which meant that prefixing variables
with an "x" to ensure that the lefthand side of a comparison always
started with an alphanumeric character was needed. Modern shells don't
suffer from this issue (i.e Bash was fixed in 1996).
In any case, we've already got unprefixed checks used in our codebase,
i.e https://github.com/bitcoin/bitcoin/blob/master/configure.ac#L292,
and have dependencies (in depends) that also use unprefixed comparisons.
I think it's time that we can consolidate on not using the x-prefix
workaround. At best it's mostly just confusing.
More info:
https://github.com/koalaman/shellcheck/wiki/SC2268https://www.vidarholen.net/contents/blog/?p=1035
Currently, if you build depends using `NO_BDB=1` (only sqlite wallets),
./configure will fail as it still tries to find bdb. i.e:
```bash
checking for Berkeley DB C++ headers... default
configure: error: Found Berkeley DB other than 4.8, required for portable BDB wallets (--with-incompatible-bdb to ignore or --without-bdb to disable BDB wallet support)
```
This PR fixes the build such that you can build depends, opting out of
bdb without opting out of wallets entirely, and still configure
successfully.
Previously, when running ./configure:
1. With CONFIG_SITE pointed to our depends config.site.in, and
2. PYTHONPATH was not set either in the environment or by the user
The configure would output something like:
PYTHONPATH='depends/x86_64-pc-linux-gnu/share/../native/lib/python3/dist-packages:'
When we really mean:
PYTHONPATH='depends/x86_64-pc-linux-gnu/share/../native/lib/python3/dist-packages'
...without the colon
This change makes sure that:
1. There's no trailing colon, and
2. We use the $PATH_SEPARATOR variable instead of a colon
Files like config.site.in are not referenced by any other script in our
tree, so we need to mark it manually with a "shellcheck shell="
directive and make sure that shellcheck is run on them.
Previously, if ./configure was invoked with:
```
$ env CONFIG_SITE=depends/x86_64-pc-linux-gnu/share/config.site ./configure
```
Where $CONFIG_SITE was a relative path, ./configure would fail with the
following misleading output:
```
checking for boostlib >= 1.58.0 (105800)... yes
checking whether the Boost::System library is available... yes
configure: error: Could not find a version of the Boost::System library!
```
Fully resolving depends_prefix in config.site.in fixes this. To make
sure that there are no other side effects I ran a diff on the
config.status generated by:
1. The scripts prior to this change with CONFIG_SITE set to a full path:
env CONFIG_SITE=$PWD/depends/x86_64-pc-linux-gnu/share/config.site ./configure
2. The scripts after this change with CONFIG_SITE set to a relative path:
env CONFIG_SITE=depends/x86_64-pc-linux-gnu/share/config.site ./configure
And it looks good!
Diff: https://paste.sr.ht/~dongcarl/95b469fbc555c128046e85723d87a9082a754f6b
8a26848c46 build: Fix m4 escaping (Hennadii Stepanov)
9123ec15db build: Remove extra tokens warning (Hennadii Stepanov)
fded4f48c3 build: Remove duplicated QT_STATICPLUGIN define (Hennadii Stepanov)
05a93d5d96 build: Fix indentation in bitcoin_qt.m4 (Hennadii Stepanov)
ddbb419310 build: Use pkg-config in BITCOIN_QT_CONFIGURE for all hosts (Hennadii Stepanov)
492971de35 build: Fix mingw pkgconfig file and dependency naming (Hennadii Stepanov)
Pull request description:
This PR makes `bitcoin_qt.m4` to use `pkg-config` for all hosts and removes non-pkg-config paths from it. This is a step towards the idea which was clear [stated](https://github.com/bitcoin/bitcoin/pull/8314#issue-76644643) by Cory Fields:
> I believe the consensus is to treat Windows like the others and require pkg-config across the board. We can drop all of the non-pkg-config paths, and simply AC_REQUIRE(PKG_PROG_PKG_CONFIG)
There are two unsolved problems with this PR. If depends is built with `DEBUG=1` the `configure` script fails to pickup Qt:
- for macOS host (similar to, but not the same as #16391)
- for Windows host (regression)
The fix is ~on its way~ submitted in #18298 (as a followup).
Also this PR picks some small improvements from #17820.
ACKs for top commit:
theuni:
Code review ACK 8a26848c46
dongcarl:
Code Review ACK 8a26848c46
laanwj:
Code review ACK 8a26848c46
Tree-SHA512: 3b25990934b939121983df7707997b31d61063b1207d909f539d69494c7cb85212f353092956d09ecffebb9fef28b869914dd1216a596d102fcb9744bb5487f7
This reverts the changes made in merge commit
1b307613604883daea4913a65da30ae073c9dc4d:
This reverts commit b919efadff.
This reverts commit d54f64c6c7.
This reverts commit 787f40668d.
This reverts commit d630646662.
This reverts commit e6e44eedd5.
This change adds to the BITCOIN_QT_CONFIGURE script ability to use
pkg-config for MinGW. All of the non-pkg-config paths are removed as
needless.
If depends is built with DEBUG=1 the configure script fails to pickup
Qt:
- for macOS host (similar, but not the same as issue 16391)
- for Windows host (regression)
This does not break any existing prefix behavior, only makes new behavior work.
For example:
CONFIG_SITE=$PWD/depends/x86_64-pc-linux-gnu/share/config.site ./configure --prefix=/
fanquake