libpq: update mingw static libraries patch to work with 15.4

[scandyna]

Summary

Changes to recipe: libpq/15 (not the recipe, but a patch)

Motivation

See #25282

Building libpq/15.4 static on MinGW produces an empty libpq.a library. When used, linking fails with undefined references.

Details

The patches/15/001-mingw-build-static-libraries.patch was created to fix MinGW static builds and worked for erlier versions of libpq, but fails for 15.4.
Digging in what this patch does, I found a missing block that also has to be patched in the Makefile.shlib, starting at line 358:

# Win32 case

# See notes in src/backend/parser/Makefile about the following two rules
$(stlib): $(shlib)
	touch $@

With this PR, this block will be replaced with:

# Win32 case

# See notes in src/backend/parser/Makefile about the following two rules
$(stlib): $(OBJS) | $(SHLIB_PREREQS)
	rm -f $@
	$(LINK.static) $@ $^
	$(RANLIB) $@
	touch $@

---

• Read the contributing guidelines
• Checked that this PR is not a duplicate: list of PRs by recipe
• Tested locally with at least one configuration using a recent version of Conan

I ran the tests for some configurations:
https://gitlab.com/scandyna/conan-center-index-partialbasicci-sandbox/-/pipelines/1474053728

Note that for MSVC, the test_v1_package fails. Probably something missing in my environment (I don't use the cmake generator anymore).

[scandyna]

license/cla is still pending:

license/cla Expected — Waiting for status to be reported

I got here yesterday, and today, to agree again.
Just after, if I go to the same page, or here, it tells me:

You have agreed to the CLA for conan-io/conan-center-index

Is there something I should do ?

[conan-center-bot]

Conan v1 pipeline ✔️

Warning

Conan Center will stop receiving updates for Conan 1.x packages soon - please see announcement.

All green in build 2 (a0c656667d2c92e28c40e63a39de54df8df19397):

• libpq/15.4:
  Built 20 packages out of 22 (All logs)

• libpq/15.5:
  Built 20 packages out of 22 (All logs)

• libpq/14.9:
  Built 20 packages out of 22 (All logs)

• libpq/13.12:
  Built 20 packages out of 22 (All logs)

• libpq/15.3:
  Built 20 packages out of 22 (All logs)

• libpq/11.21:
  Built 20 packages out of 22 (All logs)

• libpq/12.16:
  Built 20 packages out of 22 (All logs)

• libpq/9.6.24:
  Built 20 packages out of 22 (All logs)

• libpq/10.23:
  Built 20 packages out of 22 (All logs)

---

Conan v2 pipeline ✔️

Note: Conan v2 builds are now mandatory. Please read our discussion about it.

All green in build 2 (a0c656667d2c92e28c40e63a39de54df8df19397):

• libpq/13.12:
  All packages built successfully! (All logs)

• libpq/15.5:
  All packages built successfully! (All logs)

• libpq/15.4:
  All packages built successfully! (All logs)

• libpq/15.3:
  All packages built successfully! (All logs)

• libpq/12.16:
  All packages built successfully! (All logs)

• libpq/10.23:
  All packages built successfully! (All logs)

• libpq/11.21:
  All packages built successfully! (All logs)

• libpq/14.9:
  All packages built successfully! (All logs)

• libpq/9.6.24:
  All packages built successfully! (All logs)

[ErniGH]

So sorry for the noise here

[ErniGH]

Hello @scandyna,

I'm sorry for not getting back to you sooner. I was looking at this new patch. I’ve tried to connect it with some upstream issue or thread discussing the matter, but I haven’t found anything. Could you help me understand the origin of these changes? I appreciate any help you can provide.