Fixes building with GCC 12.x. The issue is the missing <limits> header in llvm/lib/Demangle/ItaniumDemangle.cpp.
In current LLVM, the header is included via `, added in https://github.com/llvm/llvm-project/commit/1f9e18b6565fd1bb69c4b649b9efd3467b3c7c7d, however that header doesn't exist in the LLVM revision (looks like 7.0.0 ?) used here.
This was also reported in #293. To reproduce:
apt install gcc g++ git make patch libz-dev curl cmake python3
g++ --version
g++ (Ubuntu 12.3.0-3ubuntu1) 12.3.0
git clone https://github.com/thepowersgang/mrustc
cd mrustc
make RUSTCSRC
make -f minicargo.mk
make -f Makefile all
make[1]: Entering directory '/mrustc'
[CXX] -o .obj/main.o
[CXX] -o .obj/span.o
[CXX] -o .obj/rc_string.o
[CXX] -o .obj/debug.o
-- Generating done (0.6s)
-- Build files have been written to: /mrustc/rustc-1.29.0-src/build
cd rustc-1.29.0-src/build && make -j 1
make[1]: Entering directory '/mrustc/rustc-1.29.0-src/build'
…
make[3]: Entering directory '/mrustc/rustc-1.29.0-src/build'
[ 0%] Building CXX object lib/Demangle/CMakeFiles/LLVMDemangle.dir/ItaniumDemangle.cpp.o
/mrustc/rustc-1.29.0-src/src/llvm/lib/Demangle/ItaniumDemangle.cpp:176:36: error: 'numeric_limits' is not a member of 'std'
176 | unsigned CurrentPackIndex = std::numeric_limits<unsigned>::max();
| ^~~~~~~~~~~~~~
/mrustc/rustc-1.29.0-src/src/llvm/lib/Demangle/ItaniumDemangle.cpp:176:51: error: expected primary-expression before 'unsigned'
176 | unsigned CurrentPackIndex = std::numeric_limits<unsigned>::max();
| ^~~~~~~~
/mrustc/rustc-1.29.0-src/src/llvm/lib/Demangle/ItaniumDemangle.cpp:177:34: error: 'numeric_limits' is not a member of 'std'
177 | unsigned CurrentPackMax = std::numeric_limits<unsigned>::max();
| ^~~~~~~~~~~~~~
/mrustc/rustc-1.29.0-src/src/llvm/lib/Demangle/ItaniumDemangle.cpp:177:49: error: expected primary-expression before 'unsigned'
177 | unsigned CurrentPackMax = std::numeric_limits<unsigned>::max();
| ^~~~~~~~
/mrustc/rustc-1.29.0-src/src/llvm/lib/Demangle/ItaniumDemangle.cpp: In member function 'void {anonymous}::ParameterPack::initializePackExpansion({anonymous}::OutputStream&) const':
/mrustc/rustc-1.29.0-src/src/llvm/lib/Demangle/ItaniumDemangle.cpp:1067:34: error: 'numeric_limits' is not a member of 'std'
1067 | if (S.CurrentPackMax == std::numeric_limits<unsigned>::max()) {
| ^~~~~~~~~~~~~~
/mrustc/rustc-1.29.0-src/src/llvm/lib/Demangle/ItaniumDemangle.cpp:1067:49: error: expected primary-expression before 'unsigned'
1067 | if (S.CurrentPackMax == std::numeric_limits<unsigned>::max()) {
| ^~~~~~~~
/mrustc/rustc-1.29.0-src/src/llvm/lib/Demangle/ItaniumDemangle.cpp:1067:49: error: expected ')' before 'unsigned'
/mrustc/rustc-1.29.0-src/src/llvm/lib/Demangle/ItaniumDemangle.cpp:1067:8: note: to match this '('
1067 | if (S.CurrentPackMax == std::numeric_limits<unsigned>::max()) {
| ^
/mrustc/rustc-1.29.0-src/src/llvm/lib/Demangle/ItaniumDemangle.cpp: In member function 'virtual void {anonymous}::ParameterPackExpansion::printLeft({anonymous}::OutputStream&) const':
/mrustc/rustc-1.29.0-src/src/llvm/lib/Demangle/ItaniumDemangle.cpp:1150:35: error: 'numeric_limits' is not a member of 'std'
1150 | constexpr unsigned Max = std::numeric_limits<unsigned>::max();
| ^~~~~~~~~~~~~~
/mrustc/rustc-1.29.0-src/src/llvm/lib/Demangle/ItaniumDemangle.cpp:1150:50: error: expected primary-expression before 'unsigned'
1150 | constexpr unsigned Max = std::numeric_limits<unsigned>::max();
| ^~~~~~~~
make[3]: *** [lib/Demangle/CMakeFiles/LLVMDemangle.dir/build.make:76: lib/Demangle/CMakeFiles/LLVMDemangle.dir/ItaniumDemangle.cpp.o] Error 1
Fixes building with GCC 12.x. The issue is the missing header is included via `, added in https://github.com/llvm/llvm-project/commit/1f9e18b6565fd1bb69c4b649b9efd3467b3c7c7d, however that header doesn't exist in the LLVM revision (looks like 7.0.0 ?) used here.
<limits>header inllvm/lib/Demangle/ItaniumDemangle.cpp. In current LLVM, theThis was also reported in #293. To reproduce: