jinja2cpp does not support GNU extensions

[mpusz]

Trying to run

conan install jinja2cpp/1.2.1@ -pr gcc8 -s compiler.cppstd=gnu17 -b missing

fails with:

-- infix: EXPECTED-LITE target: expected-lite
-- infix: VARIANT-LITE target: variant-lite
-- infix: OPTIONAL-LITE target: optional-lite
-- infix: STRING-VIEW-LITE target: string-view-lite
-- Configuring done
CMake Error in source_subfolder/CMakeLists.txt:
  Target "jinja2cpp" requires the language dialect "CXXgnu17" (with compiler
  extensions), but CMake does not know the compile flags to use to enable it.


-- Generating done
CMake Warning:
  Manually-specified variables were not used by the project:

    CMAKE_EXPORT_NO_PACKAGE_REGISTRY


CMake Generate step failed.  Build files cannot be regenerated correctly.
jinja2cpp/1.2.1: 
jinja2cpp/1.2.1: ERROR: Package '84516759796ff5640adc0609f1f04e809ffe76db' build failed
jinja2cpp/1.2.1: WARN: Build folder /home/mpusz/.conan/data/jinja2cpp/1.2.1/_/_/build/84516759796ff5640adc0609f1f04e809ffe76db
ERROR: jinja2cpp/1.2.1: Error in build() method, line 96
        cmake = self._configure_cmake()
while calling '_configure_cmake', line 88
        self._cmake.configure(build_folder=self._build_subfolder)
        ConanException: Error 1 while executing cd '/home/mpusz/.conan/data/jinja2cpp/1.2.1/_/_/build/84516759796ff5640adc0609f1f04e809ffe76db/build_subfolder' && cmake -G "Ninja" -DCMAKE_BUILD_TYPE="Release" -DCONAN_CMAKE_CXX_STANDARD="17" -DCONAN_CMAKE_CXX_EXTENSIONS="ON" -DCONAN_STD_CXX_FLAG="-std=gnu++17" -DCONAN_IN_LOCAL_CACHE="ON" -DCONAN_COMPILER="gcc" -DCONAN_COMPILER_VERSION="8" -DCONAN_CXX_FLAGS="-m64" -DCONAN_SHARED_LINKER_FLAGS="-m64" -DCONAN_C_FLAGS="-m64" -DCONAN_LIBCXX="libstdc++11" -DBUILD_SHARED_LIBS="OFF" -DCMAKE_INSTALL_PREFIX="/home/mpusz/.conan/data/jinja2cpp/1.2.1/_/_/package/84516759796ff5640adc0609f1f04e809ffe76db" -DCMAKE_INSTALL_BINDIR="bin" -DCMAKE_INSTALL_SBINDIR="bin" -DCMAKE_INSTALL_LIBEXECDIR="bin" -DCMAKE_INSTALL_LIBDIR="lib" -DCMAKE_INSTALL_INCLUDEDIR="include" -DCMAKE_INSTALL_OLDINCLUDEDIR="include" -DCMAKE_INSTALL_DATAROOTDIR="share" -DCONAN_CMAKE_POSITION_INDEPENDENT_CODE="ON" -DCMAKE_MODULE_PATH="/home/mpusz/.conan/data/jinja2cpp/1.2.1/_/_/build/84516759796ff5640adc0609f1f04e809ffe76db" -DCMAKE_EXPORT_NO_PACKAGE_REGISTRY="ON" -DCONAN_EXPORTED="1" -DJINJA2CPP_BUILD_TESTS="False" -DJINJA2CPP_STRICT_WARNINGS="False" -DJINJA2CPP_BUILD_SHARED="False" -DJINJA2CPP_DEPS_MODE="conan-build" -DJINJA2CPP_CXX_STANDARD="gnu17" -Wno-dev '/home/mpusz/.conan/data/jinja2cpp/1.2.1/_/_/build/84516759796ff5640adc0609f1f04e809ffe76db'

which is caused by the:

conan-center-index/recipes/jinja2cpp/all/conanfile.py

Line 74 in 8cdaf73

self._cmake.definitions["JINJA2CPP_CXX_STANDARD"] = self.settings.compiler.get_safe("cppstd", 14)

and:

https://github.com/jinja2cpp/Jinja2Cpp/blob/4b86a7cecb038614a55b65cca94d9fb56b723d78/CMakeLists.txt#L232-L234

Conan profile

$ conan profile show gcc8
Configuration for profile gcc8:

[settings]
os=Linux
os_build=Linux
arch=x86_64
arch_build=x86_64
compiler=gcc
compiler.version=8
compiler.libcxx=libstdc++11
build_type=Release
[options]
[conf]
[build_requires]
[env]
CXX=/usr/bin/g++-8
CC=/usr/bin/gcc-8
CONAN_CMAKE_GENERATOR=Ninja

[perseoGI]

Hi there,
I was reviewing old issues and I have come across this one.
I'm closing this issue as this was resolved in #20520

Happy coding 🐸