[gflags] build failure with release-only build

[adamreeve]

Operating system

Linux (Fedora 39)

Compiler

GCC 13.2.1

Steps to reproduce the behavior

cp $VCPKG_ROOT/triplets/x64-linux.cmake ./x64-linux-release.cmake
echo "set(VCPKG_BUILD_TYPE release)" >> ./x64-linux-release.cmake
vcpkg install --triplet=x64-linux-release --overlay-triplets=$PWD gflags

Failure logs

Computing installation plan...
The following packages will be built and installed:
	gflags:x64-linux-release -> 2.2.2#8
Detecting compiler hash for triplet x64-linux-release...
Restored 0 package(s) from /home/adam/.cache/vcpkg/archives in 6.62 us. Use --debug to see more details.
Installing 1/1 gflags:x64-linux-release...
Building gflags:x64-linux-release...
-- [OVERLAY] Loading triplet configuration from: /home/adam/dev/gflags_repro/x64-linux-release.cmake
-- Using cached gflags-gflags-v2.2.2.tar.gz.
-- Cleaning sources at /home/adam/dev/vcpkg/buildtrees/gflags/src/v2.2.2-d9283b9285.clean. Use --editable to skip cleaning for the packages you specify.
-- Extracting source /home/adam/dev/vcpkg/downloads/gflags-gflags-v2.2.2.tar.gz
-- Applying patch 0001-patch-dir.patch
-- Applying patch fix_cmake_config.patch
-- Using source at /home/adam/dev/vcpkg/buildtrees/gflags/src/v2.2.2-d9283b9285.clean
-- Found external ninja('1.11.1').
-- Configuring x64-linux-release
-- Building x64-linux-release-rel
-- Fixing pkgconfig file: /home/adam/dev/vcpkg/packages/gflags_x64-linux-release/lib/pkgconfig/gflags.pc
CMake Error at scripts/cmake/vcpkg_replace_string.cmake:2 (file):
  file failed to open for reading (No such file or directory):

	/home/adam/dev/vcpkg/packages/gflags_x64-linux-release/debug/lib/pkgconfig/gflags.pc
Call Stack (most recent call first):
  ports/gflags/portfile.cmake:29 (vcpkg_replace_string)
  scripts/ports.cmake:170 (include)

Additional context

This looks related to the changes from #35188 (cc @dg0yt). I tested with the commit prior to this change (ce8fd9e7246969886ee31cbd76955b6d444289cb) and the build succeeds, but it fails at a44d019a38fe7217222a4780a9ed0d62691123ae.

[dg0yt]

Thanks for reporting. I guess I was too angry about pc files being completely removed ;-)

x64-linux-release exists as a community triplet. So the issue can be reproduced immediately without overlay triplets:

vcpkg install gflags:x64-linux-release