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gcem: new package

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GCE-Math (Generalized Constant Expression Math) is a templated C++
library enabling compile-time computation of mathematical functions.
It is a header-only library, so this package is BUILDONLY:=1; the
headers and CMake config files land in staging_dir for consumers to
pick up via find_package(GCEM).

Needed as a build dependency for fluidsynth >= 2.5, whose upstream
build expects gcem at configure time and (absent a system copy)
falls back to a CMake-time download from GitHub - which breaks in
offline / restricted-network build environments such as the OpenWrt
CI.

Pinned to commit 012ae73c (2024-04-28), the revision referenced by
fluidsynth 2.5.x's bundled FindGCEM.cmake / git submodule.

CMAKE_POLICY_VERSION_MINIMUM=3.5 is set because upstream's
CMakeLists.txt declares cmake_minimum_required(VERSION 3.1), which
trips current CMake's deprecated-policy guard.

Link: https://github.com/kthohr/gcem
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
This commit is contained in:
Daniel Golle
2026-05-09 12:54:42 +01:00
parent 594c400781
commit 828b79cb9e
1 changed files with 55 additions and 0 deletions
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libs/gcem/Makefile
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include $(TOPDIR)/rules.mk
PKG_NAME:=gcem
PKG_RELEASE:=1
# gcem upstream tags only sporadically; pin to the commit that fluidsynth
# 2.5.x's FindGCEM.cmake / submodule references. Update in lockstep with
# the consumer's expected revision.
PKG_SOURCE_PROTO:=git
PKG_SOURCE_URL:=https://github.com/kthohr/gcem.git
PKG_SOURCE_DATE:=2024-04-28
PKG_SOURCE_VERSION:=012ae73c6d0a2cb09ffe86475f5c6fba3926e200
PKG_MIRROR_HASH:=70df878c9d85281c6816c231cbb320a9eccb4fb73ef32612cf8948b17716fc49
PKG_MAINTAINER:=Daniel Golle <daniel@makrotopia.org>
PKG_LICENSE:=Apache-2.0
PKG_LICENSE_FILES:=LICENSE
CMAKE_INSTALL:=1
include $(INCLUDE_DIR)/package.mk
include $(INCLUDE_DIR)/cmake.mk
# upstream CMakeLists.txt declares cmake_minimum_required(VERSION 3.1),
# which trips modern CMake's deprecated-policy guard.
CMAKE_OPTIONS += \
-DCMAKE_POLICY_VERSION_MINIMUM=3.5
define Package/gcem
SECTION:=libs
CATEGORY:=Libraries
TITLE:=GCE-Math header-only constexpr math library
URL:=https://github.com/kthohr/gcem
BUILDONLY:=1
endef
define Package/gcem/description
GCE-Math (Generalized Constant Expression Math) is a templated C++
library enabling compile-time computation of mathematical functions.
Header-only; consumed at build time only.
endef
define Build/InstallDev
$(INSTALL_DIR) $(1)/usr/include
$(CP) $(PKG_INSTALL_DIR)/usr/include/gcem.hpp $(1)/usr/include/
$(CP) $(PKG_INSTALL_DIR)/usr/include/gcem_incl $(1)/usr/include/
$(INSTALL_DIR) $(1)/usr/lib/cmake/gcem
$(CP) $(PKG_INSTALL_DIR)/usr/lib/cmake/gcem/* $(1)/usr/lib/cmake/gcem/
endef
define Package/gcem/install
:
endef
$(eval $(call BuildPackage,gcem))